JP4860320B2 - Wear-resistant particles and wear-resistant structural members - Google Patents

Description

  The present invention relates to wear-resistant particles and wear-resistant structural members, and more particularly to wear-resistant particles that can be dispersed substantially uniformly in a molten pool.The present invention also provides a built-up layer in which wear-resistant particles are dispersed substantially uniformly. The present invention relates to a wear-resistant structural member.

  There are mainly the following three examples of processes for producing a wear-resistant structural member in which hard particles, which are conventional wear-resistant particles, are dispersed. One is to form a molten pool in the overlay by consumable electrode arc welding, Tig welding, gas welding, plasma powder welding, etc., and build up while adding carbide particles, which are hard particles, to this molten pool This is a method for forming a wear-resistant build-up layer. Secondly, there is a method in which carbide particles are embedded in the coating agent of the coated arc welding rod in advance, or the arc rod is made hollow and the carbide particles are enclosed therein. The third is a cast-in method in which carbide particles are set in a mold and molten metal is injected.

(For arc welding and gas welding)
The tungsten carbide (WC, W ₂ C) system has the best performance as the hard particles. However, the WC system has a larger specific gravity than any base material, and the hard particles settle in the wear-resistant build-up layer regardless of the particle size, and aggregate in the lower layer as shown in FIG. In addition, the larger the particle size, the easier it is to sink, and as a result, the lower layer of the wear-resistant buildup layer has higher wear resistance and the upper layer becomes lower. In addition, cracks are generated in the agglomerated part of the hard particles, and the cracks are likely to progress, and are easily peeled off from the wear-resistant build-up layer.

  Since WC is easily dissolved in Fe, the eutectic carbide of Fe—W precipitates in the wear-resistant build-up layer and becomes brittle and easily cracks, and is inferior in impact resistance. In recent years, tungsten ore has soared, WC has become a very expensive particle among hard particles, the Kg unit price is hundreds of times that of a steel plate, which is disadvantageous in terms of cost, and limited use There is also an aspect that can only be used. Since WC is easily dissolved in Fe, a brittle compound is easily generated at the interface between the hard particles and the matrix. Therefore, the points when forming a wear-resistant buildup layer in which WC is dispersed are not to heat the hard particles as much as possible and to shorten the contact time between the hard particles and the molten pool. Even if WC is slightly eluted in the matrix, if the amount is appropriate, the matrix is appropriately cured and the wear resistance is improved. In addition, Fe atoms may enter the carbide by heating for a long time, and the hard particles may be altered and the hardness may be significantly reduced.

Chromium carbide (Cr ₃ C ₂ ) is the most hard particle used because it is inexpensive, but it floats in the molten pool because of its low specific gravity relative to Fe, and agglomerates in the upper layer as shown in FIG. Resulting in. Moreover, since it dissolves easily in Fe, large and unmelted hard particles are unlikely to remain, and the wear resistance of the wear-resistant build-up layer may be lowered.

  Titanium carbide (TiC) or titanium carbonitride (TiCN) is said to have excellent wear resistance following tungsten carbide (WC), because it has high hardness, is thermally stable and hardly reacts with Fe, It has an advantage that it is easily left as unmelted particles of high hardness and toughness in the wear-resistant overlay. However, since the specific gravity is light, it floats in the molten pool and tends to be distributed only on the surface layer of the wear-resistant overlay as shown in FIG. A hard particle that is unmelted and has a large particle size tends to float because buoyancy increases. In addition, TiC or TiCN has poor wettability and thus may have a weak bond with the matrix. When mild steel is used for the matrix, the TiC component elutes only slightly, so the matrix is not hardened and wear resistance is reduced.

(For coated arc welding rods)
In addition to the arc rod itself being heated by Joule heat, the hard particles are directly exposed to the arc, so that the hard particles are melted so hard that unmelted hard particles remain. When TiC hard particles are used, TiC has low reactivity with Fe and is thermally stable, but it does not work effectively to improve wear resistance because it is discharged to the outside as slag. Sometimes. Similar to the above, the distribution of unmelted particles due to the difference in specific gravity becomes non-uniform.

(In the case of casting)
Since it is necessary to fix hard particles having different specific gravities, they are forcibly fixed to the mold using a wire mesh or water glass. However, these physical fixations are not sufficient with respect to the pressure at which the molten metal is injected, and the arrangement of the hard particles may collapse. In the case of casting, the hard particles are often eluted because they are exposed to the molten metal for a long time. In this respect, a TiC system which is thermally stable and hardly reacts with Fe is advantageous.

  FIG. 26 is a schematic view showing another conventional method for producing a wear-resistant structural member. This manufacturing method is intended to solve the problem of uneven distribution of hard particles due to the difference in specific gravity between the hard particles and the matrix.

A wear-resistant build-up layer is formed on the base material 2 by the build-up layer forming mechanism shown in FIG. In this mechanism, an arc electrode 1 made of a welding wire protruding 25 mm is arranged so as to be inclined at an angle θ1 (torch angle = 30 °) with respect to a perpendicular direction of a horizontal base material 2 of mild steel. Has been. The welding current by the arc electrode 1 is 280 A, the welding voltage is 28 V, the welding wire supply speed is 100 g / min, and carbon dioxide is supplied to the welding region as a shielding gas by 30 liters per minute. The molten pool 3 formed by the arc generated from the arc electrode 1 has hard particles 4 made of WC-7% Co particles having a particle size of 1.2 mm (density 14.5 g / cm ³ ) and particle sizes of 1. Second particles 5 made of 7 mm steel balls (density 7.8 g / cm ³ ) are supplied through a bifurcated nozzle 6. This bifurcated nozzle 6 is weaved (vibration width 30 mm) in the front-rear direction with respect to the progress of welding by a triangular wave of 1.5 Hz, that is, in FIG. It is supplied at a ratio of 172 g and 28 g (volume mixing ratio 1: 0.3).

Under the conditions described above, welding is performed at a speed of 22 cm / min toward the right in the drawing. In addition, the density of the molten metal of the molten pool 3 before the hard particle | grains 4 and the 2nd particle | grains 5 are supplied is 7.06-7.21 g / cm < ³ >.

  As shown in FIG. 26, the hard particles 4 and the second particles 5 are rearward in the welding direction from the position where the straight line on the extension of the arc electrode 1 and the plane passing through the surface of the base material 2 intersect (left ) Side. Since the molten metal portion of the molten pool 3 in the supplied portion is being pushed up by the action of the arc, the molten metal portion is solidified without settling of the hard particles 4, and the hard particles 4 are being pushed up while being pushed up. The hard particles 4 are uniformly dispersed in the built-up layer 7 obtained by mixing the second particles and thus cured, and the built-up layer 7 has preferable wear resistance (for example, Patent Documents). 1).

JP-A-8-47774 (paragraphs 39 to 41, FIG. 2)

  As described above, in the conventional method for manufacturing a wear-resistant structural member, the hard particles 4 are added to the molten pool by adding the hard particles 4 and the second particles 5 which are two kinds of particles having different specific gravities in the built-up layer. It is trying to disperse uniformly in the built-up layer.

  However, the conventional manufacturing method has the following drawbacks. When the second particles 5 having a small specific gravity are added in a timely manner and exist below the hard particles 4 having a large specific gravity, the settling of the hard particles having a large specific gravity can be prevented, but the particles are always added at such a timing. However, this is not necessarily the case, and a part where particles are dispersed non-uniformly is always formed.

  Further, the hard particles 4 having a high specific gravity in the molten pool sink to the lower layer, and the second particles 5 having a low specific gravity tend to float to the upper layer. For this reason, hard particles and second particles are separated into a lower layer and an upper layer, resulting in uneven distribution of particles having different properties, and wear resistance and impact resistance depend on this uneven distribution, and uniform characteristics from the upper layer to the lower layer Unobtainable sites are formed.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide wear-resistant particles that can be dispersed substantially uniformly in a molten pool. Another object of the present invention is to provide a wear-resistant structural member having a built-up layer in which wear-resistant particles are dispersed substantially uniformly.

In order to solve the above problems, the wear-resistant particles according to the present invention are dispersed in a parent phase metal to improve wear resistance.
The core,
An outer layer covering the core,
Comprising
It consists of the material which mix | blended the 1st hard material which has a specific gravity smaller than the said parent phase metal, and the 2nd hard material which has a specific gravity larger than the said parent phase metal.

  In the wear-resistant particles according to the present invention, the thickness of the outer layer is preferably more than 100 μm.

  The wear-resistant particles according to the present invention may further include an intermediate layer disposed between the core portion and the outer layer.

  In the wear-resistant particles according to the present invention, it is preferable that the parent phase metal is any of Fe-based, Ni-based, Co-based, and Cu-based.

  Further, in the wear-resistant particles according to the present invention, the matrix metal is an Fe-based material, and the first hard material is titanium carbide, titanium carbonitride, vanadium carbide, vanadium carbonitride, zirconium carbide, zirconium carbonitride, At least one of chromium carbide and chromium carbonitride, and the second hard material has at least one of molybdenum carbide, molybdenum carbonitride, tantalum carbide, tantalum carbonitride, tungsten carbide, and tungsten carbonitride. It is also possible.

  Further, in the wear-resistant particles according to the present invention, the matrix metal is any one of a Co-based material, a Ni-based material, and a Cu-based material, and the first hard material is titanium carbide, titanium carbonitride, vanadium carbide, carbonitrided. At least one of vanadium, zirconium carbide, zirconium carbonitride, chromium carbide, chromium carbonitride, niobium carbide, and niobium carbonitride, and the second hard material is molybdenum carbide, molybdenum carbonitride, tantalum carbide, carbonitride It is also possible to have at least one of tantalum, tungsten carbide, and tungsten carbonitride.

  In the wear-resistant particles according to the present invention, the parent metal is steel, the main component of the core is a mixture of titanium carbide or titanium carbonitride and tungsten carbide, and the main component of the outer layer is carbonized. Tungsten is preferable.

  In the wear-resistant particles according to the present invention, t / T is in the range of 20% to -15%, where T is the specific gravity of the matrix metal and t is the difference in specific gravity with the matrix metal. It is preferable.

The wear-resistant structural member according to the present invention includes a parent metal and
The above-mentioned wear-resistant particles dispersed in the matrix metal;
It is characterized by comprising.

  In the wear-resistant structural member according to the present invention, the parent phase metal in which the wear-resistant particles are dispersed is a wear-resistant buildup layer, and the wear-resistant buildup layer can be built up on the base material. It is.

  Further, in the wear-resistant structural member according to the present invention, the cross section of the matrix metal along the substantially gravitational direction is separated by a line perpendicular to the gravitational direction in an area of ½ each above and below, When the number of the wear-resistant particles present in the upper layer is a and the number of the wear-resistant particles present in the lower layer of the cross section is b, a / b is preferably 0.38 or more.

  In the wear-resistant structural member according to the present invention, it is preferable that the hardness of each of the upper layer and the lower layer in the matrix metal is Hv 700 to 1000.

  In addition, the wear-resistant structural member according to the present invention includes a crusher tooth plate, a hammer, a shear blade, a cheek plate, a slip feeder bar, a bit, a bulldozer track bush, a sprocket tooth, a shoe lug, a hydraulic excavator bucket, and a tooth adapter. , Lip, tooth shroud, corner guard, GET (Ground Engaging Tool) cutting edge, end bit, tooth, ripper point, protector, wear plate, shank, trash compactor chopper Is possible.

  As described above, according to the present invention, it is possible to provide wear-resistant particles that can be dispersed substantially uniformly in the molten pool. In addition, according to another aspect of the present invention, it is possible to provide a wear-resistant structural member including a built-up layer in which wear-resistant particles are dispersed substantially uniformly.

The wear-resistant structural member preferably has the following characteristics.
(Abrasion resistance)
The hardness and toughness of the hard particles have the greatest influence on the wear resistance. The harder the hardness, the higher the wear resistance, and the higher the toughness, the more the particles do not fall off and the wear resistance is improved. Therefore, it is preferable that the hard particles have high hardness and high toughness.
Next, it is the hardness and toughness of the matrix metal part (hereinafter referred to as the matrix) that holds the hard particles that affect the wear resistance. Therefore, it is preferable to avoid precipitation of fragile compounds and generation of cracks in the matrix.

The content of hard particles also greatly affects the wear resistance. The higher the amount, the higher the wear resistance. However, if the amount is too large, the toughness of the wear-resistant material as a whole decreases. Therefore, it is preferable that the toughness does not decrease even if a large amount of hard particles are contained. For that purpose, the hard particles themselves have high toughness, and it is preferable that the hard particles are firmly bonded to the matrix.
Also, the affinity between the hard particles and the matrix is important, and in combination with materials that are poorly wettable and do not metallurgically bond or form fragile compounds at the interface, the hard particles fall off and wear resistant If there is a large crack or the like in the built-up layer, it will become a starting point and cause a defect. Therefore, a combination of materials that has good affinity and wettability between the hard particles and the matrix, is easily metallurgically bonded, and does not form a fragile compound at the interface is preferable.

(Impact resistance)
The following characteristics are required to maintain the toughness that can withstand the impact of rock collision. The toughness is affected by the hard particle distribution in addition to the hard particles and matrix toughness itself. For example, if hard particles are settled and aggregated in the lower part of the built-up layer, peeling may occur from this part. In the case where the hard particles are fine particles having a diameter of 0.1 mm or less, since the particles are aggregated, cracks are likely to occur similarly. Cracks in the wear-resistant build-up layer degrade the impact resistance. Therefore, it is preferable that the hard particles are uniformly dispersed.
In addition, voids due to poor penetration of the matrix also become stress concentrated portions and degrade impact resistance. Therefore, it is preferable that the wettability between the matrix and the hard particles is excellent.

(Ease of processing)
It is preferable that the wear-resistant build-up layer can be easily formed with a necessary thickness and shape at a required portion of the wear-resistant structural member. In order to increase the thickness of the build-up layer, multi-layer build-up is often performed, but it is important that it is easy to construct such that it does not crack even if multi-layer build-up is performed, and it does not break even if preheating or post-heating is not applied. It is. In addition, the ease of processing is advantageous in terms of cost.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a cross-sectional view showing wear-resistant particles according to Embodiment 1 of the present invention.

  By adjusting the specific gravity of hard particles as wear-resistant particles to be approximately equal to or close to that of the matrix and the specific gravity difference with the matrix within the range of 20% to -15%, the hard particles can be dispersed substantially uniformly in the matrix. It becomes possible. For this reason, the nonuniformity of the wear resistance performance due to the aggregation of the hard particles can be suppressed, the generation of cracks and peeling at the aggregated portion can be suppressed, and the impact resistance can be further improved.

  The wear-resistant particles 13 shown in FIG. 1 have a spherical shape or a shape close to a sphere, have a multilayer structure, and include a core portion 11 and an outer layer 12 that covers the core portion 11. Angular particles are prone to poor fusion, causing small holes to reduce strength, and if there are corners, stress concentrates on the corners, causing cracking and chipping of wear-resistant particles. A shape close to a sphere is desirable. Further, since the thickness of the outer layer 12 is more than 100 μm, the outer layer 12 is not completely eluted into the matrix, and the outer layer 12 remains on the surface of the core portion 11. Thereby, it can prevent that the core part 11 contacts with a matrix, and can suppress the quality change of the core part 11. FIG.

  The outer layer 12 is mainly composed of a material having good wettability with respect to an Fe-based matrix (for example, steel), for example, tungsten carbide (WC), and the core 11 has high hardness but poor wettability with respect to the matrix. The main component is a material such as ceramics (TiCN). Thereby, since the outer layer 12 is familiar with the matrix, the wear-resistant particles 13 are well welded to the matrix to improve the welding strength, and the core can maintain high hardness and improve the wear resistance.

  Further, as another example of the wear-resistant particles, a material that slightly elutes the outer layer 12 into the Fe-based matrix, for example, a tungsten carbide-based material is used as a main component so that the hardness of the matrix can be adjusted and the entire wear-resistant structural member. Abrasion resistance can be improved.

  In addition, as another example of wear-resistant particles, in the case of building up to a high current (welding current of 350 A or more), or in the case of cast-in, the elution and alteration are remarkable in the material mainly composed of the WC system. Decreases and produces brittle Fe-WC eutectic precipitates in the matrix. In such a case, the outer layer 12 is made of a hard material such as TiCN that has low reactivity with the molten metal and has high heat resistance, and the core 11 is made of WC or other carbide, so that the outer layer 12 is in direct contact between the matrix and the core 11. Disturb. Therefore, it can suppress that the superhard core part 11 elutes and changes in quality, and can suppress that a weak phase is formed in a matrix.

Further, as another example of the wear-resistant particles, the outer layer 12 is mainly composed of niobium carbide (NbC) having a low reactivity with the molten metal, and the core is chromium-based (Cr ₃ C ₂ ) which is remarkably eluted into the molten metal. The outer layer 12 prevents direct contact between the matrix and the core 11 by using the main component (system) as a main component. Therefore, the core portion 11 is prevented from being eluted or altered and dispersed in an unmelted state. Further, since Cr carbide is inexpensive, it is advantageous in terms of cost.

As described above, various combinations of the main component materials of the core 11 and the outer layer 12 can be applied. For example, the core 11 is made of a material having a specific gravity smaller than that of the matrix, for example, TiC (density: 4.85 to 4.93 g / m ³ ), VC (density: 5.36 to 5.77 g / m ³ ), ZrC (density: 6). .66 g / m ³ ), Cr ₃ C ₂ (density: 6.68 to 6.74 g / m ³ ) as main components, and the outer layer 12 is a material having a specific gravity greater than that of the matrix, for example, Mo ₂ C (density: 9.18 g). / M ³ ), TaC (density: 14.4 g / m ³ ), WC (density: 15.6 to 15.7 g / m ³ ), W ₂ C (density: 17.2 g / m ³ ) as main components. To do. Alternatively, the core 11 is mainly composed of a material having a specific gravity greater than that of the matrix, and the outer layer 12 is mainly composed of a material having a specific gravity smaller than that of the matrix. Alternatively, the specific gravity of each of the core portion 11 and the outer layer 12 is adjusted to be within a range of 20% to −15%, for example, the specific gravity difference between the core portion 11 and the outer layer 12 is substantially equal to or close to the matrix. Thereby, the specific gravity of the whole wear-resistant particles can be adjusted to a specific gravity that is substantially equal to or close to the specific gravity of the matrix. Further, the outer layer 12 is mainly made of a material compatible with the matrix, for example, a material having good wettability with respect to the matrix, and the core 11 is mainly made of an inexpensive material or a material suitable for making hard particles or adjusting the specific gravity. By using it as a component, it is possible not only to adjust the specific gravity of the wear-resistant particles, but also to increase the functionality of the wear-resistant particles.

  For example, it is possible to use a material in which WC and TiC or VC are mixed for the core 11 and WC for the outer layer 12. Thereby, the outer layer 12 becomes familiar with the matrix, and the specific gravity can be adjusted by TiC or VC of the core 11.

The above wear-resistant particles use a metal binder such as Co, Ni, Fe, Cr, or Mo as a carbide binder, and add Mo, Mo ₂ C, or Cr as a modifier, and then sinter to provide high toughness. Hard particles. When such a hard particle is dispersed to produce a wear-resistant structural member, it is possible to suppress the hard particle from falling off. For example, when a simple substance of W ₂ C, which is an example of conventional hard particles, is used, the hardness is high but the toughness is poor, so that the wear-resistant structural member is likely to drop off. Dropout is unlikely to occur.

  Further, if TiC or TiCN is used as the material of the wear-resistant particles, it is advantageous in terms of cost. Tungsten is a rare metal mainly produced from China and is very expensive. However, Ti is an element that exists in large quantities, and its specific gravity is small compared to tungsten, so it is inexpensive when compared in volume.

Next, the role of material components used for the wear resistant particles will be described.
TiCN N refines carbide crystals and improves the strength of hard particles. Since TiCN is stable to Fe and difficult to elute, particles are likely to remain in an unmelted state. However, since there is little elution of the components, there is a condition that the hardness of the matrix increases only by about Hv400, and the wear resistance of the matrix is inferior. Ti has the effect of making the crystal grains of the matrix finer, and contributes to improving the toughness of the wear-resistant material. Although TiCN is little dissolved, it is eluted in the form of microcrystals, and the matrix is a TiCN dispersion strengthening material. In this respect, it is considered that the wear resistance and toughness are improved.

  WC improves the sinterability and improves the strength of the hard particles. In addition, WC dissolves in an appropriate amount in the matrix to produce martensite, increases the hardness of the matrix, and improves the wear resistance.

  Ni used as a carbide binder has very good wettability with respect to the main component carbide and hardly causes sintering defects. The hardness can be adjusted by the amount of Ni. Increasing Ni decreases the hardness. An appropriate amount of Ni is about 8%.

Co used as a carbide binder has very good wettability with respect to the main component carbide and hardly causes sintering defects.
The bending strength is improved by adding Cr as a carbide binder or modifier.
Mo ₂ C used as a carbide binder or modifier improves the sinterability, the bending strength, and the hardness by adding a small amount (3%).

Next, the manufacturing method of the abrasion-resistant particle | grains 13 shown in FIG. 1 is demonstrated.
First, acetone is added to the WC, TiC, Co, and Ni powders that are the raw material of the core 11, and the mixture is stirred and mixed for several tens of hours in a mill incorporating a low-speed rotary blade called an attritor. Next, the raw material that has been dried after mixing and crushed is crushed, and a mixed solution of several percent of a paraffinic lubricant and acetone is added to form a mud. Drying the mud raw material will produce granulated raw material powder. This is rolled while being vibrated as a nucleus, and by sprinkling the raw material powder, the particles are greatly grown to form a desired particle size. And the raw material powder WC-Co of the outer layer 12 mixed in the same manner as described above in the final granulation step is sprinkled to form the outer layer. The formed wear-resistant particles are first held for about 500 ° C. for a while to volatilize the lubricant, and then heated to a temperature at which a liquid phase is generated and held, and sintered to produce wear-resistant particles.

(Embodiment 2)
FIG. 2 is a cross-sectional view showing wear-resistant particles according to Embodiment 2 of the present invention.
Also in the present embodiment, the point that the hard particles as the wear-resistant particles are adjusted to a specific gravity substantially equal to or close to that of the matrix is the same as in the first embodiment.

  The wear-resistant particles 17 shown in FIG. 2 have a spherical shape or a shape close to a sphere and have a multilayer structure, and a core portion 14, an intermediate layer 15 covering the core portion 14, and an outer layer 16 covering the intermediate layer 15. It is composed of For example, the outer layer 16 and the core portion 14 are made of the same material as in the first embodiment, and the intermediate layer 15 is made of a material having an intermediate property (for example, linear expansion coefficient) between the outer layer 16 and the core portion 14. It is possible to suppress cracking of the wear particles.

  As another example of the wear-resistant particles, the same material as that of the first embodiment can be used for the outer layer 16, and the material used for the core portion of the first embodiment can be used for the core portion 14 or the intermediate layer 15.

For example, Cr ₃ C ₂ can be used for the core portion 14, TiC can be used for the intermediate layer 15, and WC can be used for the outer layer 16. Can improve the compatibility with the Fe-based matrix of the WC of the outer layer 16, although TiC intermediate layer 15 is not familiar melted poor with the matrix to contribute to the wear resistance, Cr ₃ C ₂ of the core 14 It has the advantage of good wear resistance, low cost and good availability.

Next, the manufacturing method of the abrasion-resistant particle | grains 17 shown in FIG. 2 is demonstrated.
Similarly to the above, Cr ₃ C ₂ and Ni powder as raw materials for the core portion 14, TiC and Ni powder as raw materials for the intermediate layer 15, and WC and Co as raw materials for the outer layer 16 are mixed to prepare raw material powder. Next, the particle diameter is grown with the raw material powder of the core portion 14 while vibrating and rolling the particles serving as the core of the core portion 14, and then the intermediate layer 15 is sprinkled with the raw material powder of the intermediate layer 15 to form an intermediate layer. Finally, the raw material powder of the outer layer 16 is sprinkled to form a desired particle size. The formed wear-resistant particles are treated in the same manner as described above.

(Embodiment 3)
FIG. 3 is a schematic diagram showing a method for manufacturing a wear-resistant structural member according to Embodiment 3 of the present invention. FIG. 3 shows a build-up layer forming mechanism, and the wear-resistant build-up layer is formed by this mechanism. In this mechanism, the arc electrode 1 made of a welding wire protruding 25 mm is inclined so as to form an angle θ1 (torch angle = 30 °) with respect to the perpendicular direction of the base material 2 of the CrMo steel arranged horizontally. It is arranged. The welding current by the arc electrode 1 is 230 A, the welding voltage is 17 V, the welding wire supply speed is 100 g / min, and 100% argon is supplied as a shielding gas to the welding region at 30 liters per minute. In addition, the weld pool 3 formed by the arc generated from the arc electrode 1 has wear-resistant particles according to Embodiment 1 or 2 having a particle diameter of, for example, 0.25 to 0.85 mm (the density is equal to the density of the base material). 13) is supplied through the nozzle 26. The nozzle 26 is weaved (vibration width 30 mm) in the front-rear direction with respect to the welding progress by a triangular wave of 1.5 Hz, that is, in FIG. 3, and the wear-resistant particles 13 are supplied thereto at 70 g per minute.

Under the conditions described above, welding is performed at a speed of 22 cm / min toward the right in the drawing. In addition, the density of the molten metal of the molten pool 3 before the abrasion-resistant particle | grains 13 are supplied is 7.8 g / cm < ³ >.

  As shown in FIG. 3, the wear-resistant particles 13 are supplied to the rear (left) side in the welding progress direction from the position where the straight line on the extension of the arc electrode 1 and the plane passing through the surface of the base material 2 intersect. All the outer layers 12 of the wear-resistant particles 13 supplied to the molten pool 3 at approximately 1800 ° C. react with the molten metal to form an alloy layer around the wear-resistant particles 13, and the core 11 remains in the molten metal. .

According to the second embodiment, since the wear-resistant particles 13 are adjusted to have a specific gravity substantially equal to that of the base material 2, the aggregation of the wear-resistant particles 13 can be suppressed, and the wear-resistant particles 13 are also unevenly settled. The molten metal portion is solidified without rising. Therefore, the wear-resistant particles 13 are dispersed substantially uniformly in the build-up layer 7 obtained by curing, and the build-up layer 7 has preferable wear resistance and impact resistance.
When there is a difference in specific gravity between the base material 2 and the wear-resistant particles 13, the torch angle θ <b> 1 of the arc electrode 1 is adjusted so that the wear-resistant particles 13 are dispersed substantially uniformly in the built-up layer 7.

The state of particle distribution when the wear-resistant particles are substantially uniformly dispersed in the wear-resistant overlay of the wear-resistant structural member as described above will be described.
Since the specific gravity of the wear-resistant particles is uniformly dispersed by matching with that of the matrix, the uniformity can be confirmed by the vertical distribution (substantially in the direction of gravity) of the wear-resistant particles.

  The area of the cross section cut in the vertical direction (substantially the gravitational direction) of the wear-resistant build-up layer is Y, and the cross section is separated by an area of ½ in the vertical direction by a line orthogonal to the substantially gravitational direction. The number of wear-resistant particles present in the upper layer (area: Y / 2) is a, and the number of wear-resistant particles present in the lower layer (area: Y / 2) of the cross section is b. When the area is X, the wear-resistant particle content area ratio (upper layer area ratio) Top (abbreviated St) to the upper layer and the wear-resistant particle content area ratio (lower layer area ratio) Sbottom (abbreviated Sb) to the lower layer Is obtained by the following formulas (1) and (2). The index representing the uniform dispersion is St / Sb. If it is 1, it is considered that the dispersion is completely uniform, and if it is 0, it is assumed that all have settled in the lower layer.

St = aX / (Y / 2) = 2aX / Y (1)
Sb = bX / (Y / 2) = 2bX / Y (2)
St / Sb = a / b (3)

  In addition, when the amount of wear-resistant particles contained in the wear-resistant build-up layer is small or large, it is more difficult to uniformly disperse, that is, to bring the uniform dispersion index St / Sb close to 1. Therefore, the content ratio (total area ratio) S of the wear-resistant particles with respect to the entire cross-section cut in the vertical direction of the wear-resistant build-up layer is obtained by the following formula (4). Compared to the case where the area ratio S is large, it can be considered that the uniform dispersion index St / Sb is substantially uniformly dispersed even if it is far from 1.

  S = (a + b) X / Y (4)

Next, an example in which wear-resistant particles having a diameter of 1 mm are dispersed will be described.
FIG. 4 shows a minimum (limit) that is considered to be substantially uniformly dispersed when the cross section cut in the vertical direction of the wear-resistant build-up layer is a 10 mm square cross section and the total area ratio S is 10% to 60%. Is a cross-sectional view showing a distribution state of wear-resistant particles having a uniform dispersion index St / Sb and a maximum uniform dispersion index St / Sb = 1. The area Y of the cross-sectional area cut in the vertical direction of the wear-resistant build-up layer is 100 mm ² , the particle diameter φ is 1 mm, and the central cross-sectional area X of the wear-resistant particles is 0.785398163 mm ² .

Table 1 shows the uniform dispersion index St / Sb at the limit shown in FIG. 4 and numerical values for deriving it (total number of particles, total area ratio S, number of upper layer particles, upper layer area ratio St, lower layer area ratio Sb). It is what.
FIG. 5 is a graph showing the relationship between the total area ratio S shown in Table 1 and the limit uniform dispersion index St / Sb.

  As shown in FIGS. 4 and 5 and Table 1, the uniform dispersion index St / Sb decreases as the total area ratio S decreases even if the specific gravity of the wear-resistant particles is adjusted to that of the matrix. Therefore, if the uniform dispersion index is 0.38 or more or 0.38 to 0.85, it can be said that the wear-resistant particles are uniformly dispersed.

  Specifically, when the total area ratio S is 10%, the wear-resistant particles are substantially uniformly dispersed when the uniform dispersion index is 0.38 or more, and when the uniform dispersion index is less than 0.38, the wear resistance. It can be determined that the particles are not uniformly dispersed. Similarly, when the total area ratio S is 20%, 30%, 40%, 50%, and 60%, the uniform dispersion index is 0.55 or more, 0.65 or more, 0.73 or more, 0.80 or more, respectively. If it is 0.85 or more, the wear-resistant particles are dispersed substantially uniformly, and the uniform dispersion index is less than 0.55, less than 0.65, less than 0.73, less than 0.80, and less than 0.85, respectively. If there is, it can be judged that the wear-resistant particles are not uniformly dispersed.

More specifically, if the uniform dispersion index with respect to the total area ratio S is above the limit uniform dispersion index graph shown in FIG. 5, the wear-resistant particles are dispersed substantially uniformly, and the uniform dispersion index is as shown in FIG. It can be determined that the wear-resistant particles are not uniformly dispersed if it is below the graph shown in FIG.
In addition, it is preferable that the hardness of each of the upper layer and the lower layer in the matrix of the wear-resistant built-up layer is Hv 700 to 1000.

(Embodiment 4)
FIG. 6 shows a partially enlarged cross-sectional view of a bulldozer suspension device according to Embodiment 4 of the present invention. In the present embodiment, hard particles similar to the wear-resistant particles of the first embodiment are used.

  In the present embodiment, the crawler belt 31 presses the end of the bush 33 into a hole provided at one end of a pair of links 32, 32 facing each other, and both ends of the crawler belt pin 34 inserted through the bush 33 are connected to the front and rear. A link chain is formed by press-fitting into the links 32 and 32, and a crawler plate 35 is fixed to the link chain. Thus, the crawler belt 31 is wound around the sprocket 36 and the idler (not shown), and the sprocket 36 is driven so that the tooth groove portion 37 of the sprocket 36 is engaged with the bush 33, and the bush 33 is engaged with the tooth surface of the sprocket 36. The crawler belt 31 is rotated so that the bulldozer travels by moving while sliding along.

  During running of this bulldozer, sand and rocks are involved between the tooth surface of the sprocket 36 and the bush 33 and repeatedly used in sliding contact. The surfaces of the sprocket 36 and the bush 33 are used under conditions that are extremely susceptible to wear. Will be. For this reason, build-up welding is applied to the tooth portion of the sprocket 36 and the outer peripheral surface of the bush 33 at required locations, thereby improving wear resistance.

  Here, when forming the wear-resistant build-up layer, as shown in FIG. 7, arc electrodes 38 made of welding wires (for example, KOBE / JFE welding “KC-50”) are horizontally arranged. Arranged so as to form a predetermined torch angle (= 45 ° to 55 °) with respect to the surface of the base material 39, 100% argon is supplied as a shielding gas to the welding region, and the arc electrode 38 and the base material Hard particles 41 are supplied via a nozzle 42 to a molten pool 40 formed by an arc generated between the nozzles 39 and 39. By performing such welding at a predetermined speed in the direction of arrow A, the overlay layer 43 is formed on the surface of the base material 39. In this case, in order to prevent the hard particles 41 from appearing on the surface of the built-up layer 43 and to distribute the hard particles 41 densely and uniformly in the deep part of the built-up layer 43, the falling position of the hard particles 41 is directly above the arc. It is preferable not to drop it before this.

  Next, a method for forming a built-up layer for each part of the sprocket 36 and the bush 33 will be described in detail.

  Concerning Method for Forming Build-up Layer in Sprocket 36 When a build-up layer is formed on the tooth portion (sprocket teeth) of the sprocket 36, as shown in FIG. 8 (a), it intersects with the rotation direction of the sprocket 36. In the direction, preferably the direction orthogonal to the direction (arrow B direction), the contact surface with the bush 33 and the tooth tip are entirely built up. Here, for each tooth surface, the build-up layer is formed in parallel in the direction from the tooth tip portion to the tooth root portion (the direction of arrow C), so that the build-up quality is stable even in order to make the bead appearance uniform. It is also desirable to make Because, if the build-up layer is formed in the opposite direction, that is, the direction from the tooth root portion to the tooth tip portion (the direction opposite to the arrow C), the heat of welding accumulates in the base material, This is because, since the temperature becomes high and the penetration depth, the content and distribution of particles, and the structure of the matrix metal change, it is impossible to continuously form a built-up layer. In addition, as shown in FIG. 8 (b), in the vicinity of the tip of the tooth (about 30 mm), the extra height is made lower than that of other parts (3 to 4 mm), and the tooth top is overlaid. It is desirable not to add hard particles to prevent layer loss. Furthermore, it is preferable that the hard particles are supplied with the content of the intermediate portion between the tooth root portion and the tooth tip portion being larger than the respective contents of the tooth root portion and the tooth tip portion.

  By defining the distribution of the build-up layer and the distribution of hard particles as described above, the tooth root part and the tooth tip part mainly have toughness, and the intermediate part between the tooth root part and the tooth tip part mainly has a toughness. Since wear resistance can be imparted, peeling and chipping of the tooth tip can be prevented, and the durability of the build-up layer can be stabilized. As shown in FIG. 8 (a), when the overlay layer is formed, cracks may occur in the direction perpendicular to the bead as shown in FIG. 8 (a). Since it coincides with the direction of arrow B ′, the opening of the crack can be prevented.

  Regarding the method for forming the built-up layer in the bush 33, when the built-up layer is formed on the outer peripheral surface of the bush 33, as shown in FIG. 9, the rotational direction of the sprocket 36 (the sliding direction of the bush 33 (FIG. 9A ) In the direction intersecting with arrow D ′)), preferably in the direction perpendicular to (arrow D direction) over the substantially half circumference of the outer peripheral surface of the bush as a contact surface with the sprocket 36. When this build-up layer formation range is the entire circumference of the outer peripheral surface of the bush, there is no escape for thermal stress and transformation stress that occurs during the build-up layer formation, etc., and the base material is deformed or cracked. There is a drawback that. On the other hand, if the built-up layer is formed only in the required part as in the present embodiment, there is an advantage that the inner diameter processing of the bush base material after the built-up layer is formed becomes unnecessary. In addition, this build-up layer formation range is not limited to a substantially half circumference (180 °) as in the present embodiment, but may be a necessary minimum angle range (for example, 120 °).

(Embodiment 5)
FIG. 10 is a front view showing a striker according to the fifth embodiment of the present invention. FIG. 11 is a rear view of the crusher striker shown in FIG. 10. In the present embodiment, hard particles similar to the wear-resistant particles of the first embodiment are used.

  The striker is mainly used for crushing industrial waste such as wood, and the portion shown in a satin-like shape in FIGS. 10 and 11 is a meat in which hard particles are built up to improve wear resistance. It is a built-up layer 50. Further, a super hard body is fitted to the tip portion. It is attached to a rotating hammer or the like with a part of the flange cut out and flattened downward, and hits and crushes wood or the like.

(Embodiment 6)
FIG. 12 (A) is a view showing a tooth plate of a crusher according to Embodiment 6 of the present invention, and FIG. 12 (B) is a sectional structure of teeth of the tooth plate shown in FIG. 12 (A). In the present embodiment, the wear resistant material is the same as the wear resistant particles of the first embodiment.

  The crusher mainly crushes industrial waste such as concrete glass and asphalt with a tooth plate. As shown in FIG. 12 (B), a wear-resistant material is embedded and welded inside the teeth of the tooth plate.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, even when the wear-resistant particles according to Embodiment 1 or 2 are used in the cast-in method, the penetration of the molten metal is facilitated by using a material with good wettability for the outer layer.

  Further, when the wear-resistant particles according to Embodiment 1 or 2 described above are used for manufacturing a casting, the wear-resistant particles having a specific gravity substantially equal to that of the molten metal are added to the molten metal and stirred to uniformly disperse the wear-resistant particles. A casting can be manufactured, and this casting may be used as a wear-resistant part as it is, or may be attached to a necessary part by welding or bolt fastening.

  In the above embodiment, the Fe-based material is used for the matrix. However, the present invention is not limited to this, and other materials for the matrix, such as Ni-based (for example, Colmonoy), Co-based ( For example, any material such as stellite) and Cu-based materials (such as aluminum bronze and phosphor bronze) may be used.

  In addition to Embodiments 4 to 6, the shearing blade of the crusher, the cheek plate, the slip feeder bar, the bit, the bulldozer shoe lug, the bucket of the hydraulic excavator, the tooth adapter, the lip, the inter-tooth shroud, the corner guard, the GET ( (Ground Engaging Tool) The cutting edge of the part, the end bit, the tooth, the ripper point, the protector, the wear plate, the shank, and the iron wheel chopper of the trash compactor may be used.

Example 1
FIG. 13 is a cross-sectional view showing the wear-resistant structural member according to the first embodiment. This wear-resistant structural member uses wear-resistant particles similar to those in the first embodiment shown in FIG. 1, and a wear-resistant buildup layer is formed by the same manufacturing method as that in the third embodiment shown in FIG. Therefore, detailed description is omitted.

CrMo steel was used for the base material 2, mild steel was used for the welding wire, Ar-20% CO ₂ was used for the shielding gas, a welding current of 230 A, and a welding voltage of 17 V were used. As the wear-resistant particles 13, 45TiCN-8Ni-47 (WC-7Co) particles produced using TiCN as the material of the core 11 and WC as the material of the outer layer 12 were used. The particle diameter of the particles was 0.25 to 0.85 mm, and the specific gravity of the particles was 7.82.

  According to Example 1 described above, by adjusting the wear-resistant particles 13 to have a specific gravity substantially equal to that of the base material 2, the aggregation of the wear-resistant particles can be suppressed, and the wear-resistant particles 13 are placed in the built-up layer obtained by curing. It was confirmed that it could be dispersed substantially uniformly.

  14 is a cross-sectional view showing a wear-resistant structural member as a comparative example with respect to Example 1. FIG. In this wear-resistant structural member, a wear-resistant build-up layer is formed by the same manufacturing method as in Embodiment 3 shown in FIG. However, WC-8Co particles, which are conventional hard particles, were used as the wear-resistant particles. The particle diameter of the particles was 0.25 to 0.85 mm, and the specific gravity of the particles was 14.5.

  In the comparative example, the hard particles are sunk and aggregated in the lower part of the built-up layer. Therefore, it was confirmed that the hard particles cannot be uniformly dispersed unless the specific gravity of the hard particles matches that of the base material.

FIG. 15 is a graph showing the results of measuring the hardness in the depth direction from the surface of the built-up layer of the wear-resistant structural member of Example 1 shown in FIG. 13 and showing the relationship between the distance in the depth direction and the hardness. .
According to FIG. 15, the hardness of the built-up layer was Hv 700 to 1000 from the upper layer to the lower layer, and it was confirmed that the built-up layer maintained high hardness.

FIG. 16 is a graph showing the result of measuring the hardness in the depth direction from the surface of the build-up layer of the wear-resistant structural member of the comparative example shown in FIG. 14, and is a graph showing the relationship between the distance in the depth direction and the hardness.
According to FIG. 16, the hardness of the upper layer of the built-up layer was lower than Hv700, and it was confirmed that high hardness like the built-up layer of the wear-resistant structural member of Example 1 cannot be maintained in the upper layer.

  FIG. 17 is a photograph showing the crystal structure in the built-up layer of the wear-resistant structural member of Example 1 shown in FIG. This crystal structure has retained austenite and martensite, and TiCN carbide (white grains) is uniformly dispersed. The hardness of this crystal structure portion was Hv800. Also in FIG. 17, it was confirmed that the wear-resistant particles made of TiCN carbide can be dispersed substantially uniformly in the build-up layer.

  FIG. 18 is a photograph showing the crystal structure of the build-up layer of the wear-resistant structural member of the comparative example shown in FIG. This crystal structure has retained austenite and Fe—W eutectic precipitates. The hardness of the crystal structure portion was about Hv 500, which was lower than that of the build-up layer of Example 1.

  FIG. 19 is a graph showing the results of a bending test performed on the wear-resistant structural members of Example 1 shown in FIG. 13 and the comparative example shown in FIG. Four samples similar to the wear-resistant structural member of Example 1 were prepared and the wear-resistant structural member of the comparative example was prepared. A bending test was performed for each of the samples. The results are shown in FIG. It is described as Particle (2), New Particle (3), New Particle (4) and Comparative Example.

  According to FIG. 19, it was confirmed that the wear-resistant structural member of Example 1 has a high bending strength, and the wear-resistant structural member of the comparative example has a low bending strength.

The bending test was performed by the following method using a bending test apparatus (see JIS H5501).
1. The distance between fulcrums of the bending test apparatus is 20 mm or 30 mm, the round radii of the respective fulcrum and load point are about 2 mm and 3 mm, and cemented carbide is used for the fulcrum and load point. The load point is the center between the fulcrums. In addition, if there are cracks or holes in the fracture surface of the sample in this test, and it is determined that this has affected the test results, the results will be invalid and other samples made at the same time will be retested.

2. The next sample is made for each production unit of each sample, and the surface of the sample is smoothly ground on four sides in the length direction to about 1.5-S. However, the thickness deviation of this sample is 0.1 mm or less.
(1) When the distance between fulcrums is 20 mm 24 mm (length) x 8 mm (width) x 4 mm (thickness)
(2) When the distance between fulcrums is 30 mm 35 mm (length) x 10 mm (width) x 6 mm (length)

  3. The measuring method is that a sample is placed on the fulcrum of the bending test apparatus, the load is applied in the direction of thickness, the load is gradually increased, and the load scale when it breaks is read.

4). The bending strength is calculated by the following formula.
Folding force = 3 pl / ² bt ² (kgf / mm ² {N / mm ² })
Where p: load at break (kgf {N})
b: Width of sample (mm)
t: sample thickness (mm)
l: Distance between both fulcrums (mm)

  FIG. 20 is a graph showing the results of a Charpy impact test performed with a notchless. Four test pieces similar to the wear-resistant structural member of Example 1 were prepared, three test pieces of the wear-resistant structural member of the comparative example were prepared, and high Cr cast iron (28Cr-2.8C) for comparison was prepared. Three test pieces were prepared, and Charpy impact tests were performed on each of the test pieces. The results are shown in FIG. 20 as (1), (2), (3), (4), Comparative Example (1), Comparative Example (2), It describes as Comparative Example (3) and high Cr cast iron (1), high Cr cast iron (2), and high Cr cast iron (3).

  In the Charpy impact test, a notchless test piece is supported at both ends, and the test piece is broken by a hammer stroke under a certain condition to obtain characteristics (see JIS Z 2242).

The energy required to break the test piece is calculated by the following formula.
K = M (cosβ-cosα)
Where K: energy required to break the specimen (J)
M: Moment around the rotation axis of the hammer (N · m)
M = W · r
W: Load due to hammer mass (N)
r: Distance from the center of rotation of the hammer to the center of gravity (m)
α: Hammer lifting angle (°)
β: Hammer swing angle after specimen breakage (°)

  According to FIG. 20, it is confirmed that the wear-resistant structural member of Example 1 does not break unless high energy is applied, and the wear-resistant structural member of the comparative example and the high Cr cast iron breaks with low energy. It was done.

  FIG. 21 is a diagram schematically showing an apparatus for performing a wear test on a test piece. FIG. 22 shows the result of the wear test performed by the apparatus shown in FIG. 21, and is a graph showing the relationship between the average hardness and the 1 / wear volume ratio.

  As a test piece for performing the wear test, a test piece (invention product) of the wear-resistant structural member of Example 1 and a test piece to be compared therewith were prepared. As test specimens to be compared, HARDOX 500 of Swedish steel which is a representative wear-resistant steel plate, SKD11 and SKH51 which are JIS steel materials, 1-layer high-Cr cast iron overlay, 2-layer high-Cr cast iron overlay, tungsten carbide particles A gas-welded material and a super hard particle dispersion material (conventional type) were prepared.

  As shown in FIG. 21, a rubber wheel is rotated, a test piece is pressed against the rubber wheel by a test load, and silica sand is dropped from the quartz sand hopper between the test piece and the rubber wheel, and a 1 / wear volume ratio is measured. To do. The test conditions are as follows.

(Test conditions)
(1) Use silica sand 20-48 mesh (2) Test load 13.26kg
(3) Silica sand supply amount 300g / min
(4) Rubber wheel peripheral speed 100m / min
(5) Test time 20 minutes (6) Test piece dimensions 12t x 25w x 75L
(7) Wheel thickness 12.7mm

  According to FIG. 22, it was confirmed that the wear-resistant structural member of Example 1 which is an invention has higher wear resistance than the comparative example.

It is sectional drawing which shows the abrasion-resistant particle | grains by Embodiment 1 of this invention. It is sectional drawing which shows the abrasion-resistant particle | grains by Embodiment 2 of this invention. It is a schematic diagram which shows the manufacturing method of the wear-resistant structural member by Embodiment 3 of this invention. The lowest (limit) uniform dispersion that is considered to be substantially uniformly dispersed when the section cut in the vertical direction of the wear-resistant cladding layer is a 10 mm square section and the total area ratio S is 10% to 60%. It is sectional drawing which shows the distribution state of the wear-resistant particle | grains of index St / Sb and the highest uniform dispersion index St / Sb = 1. It is a graph which shows the relationship between the total area ratio S shown in Table 1, and the limit uniform dispersion index St / Sb. It is a partial expanded sectional view which shows the underbody apparatus of the bulldozer which concerns on Embodiment 4 of this invention. It is formation mechanism explanatory drawing of a build-up layer. (A), (b) is a built-in layer formation state explanatory drawing of a sprocket. (A) (b) (c) is an explanatory drawing of the built-up layer formation state of a bush. It is a front view which shows the striker for crushers by Embodiment 5 of this invention. It is a rear view of the crusher striker shown in FIG. (A) is a figure which shows the tooth plate of the crusher by Embodiment 6 of this invention, (B) is a cross-sectional structure | tissue of the tooth of the tooth plate shown to (A). 1 is a cross-sectional view showing a wear-resistant structural member according to Example 1. FIG. 3 is a cross-sectional view showing a wear-resistant structural member as a comparative example with respect to Example 1. FIG. It is a graph which shows the relationship between the distance of the depth direction in the build-up layer of the wear-resistant structural member of Example 1 shown in FIG. 13, and hardness. It is a graph which shows the relationship between the distance of the depth direction in the build-up layer of the abrasion-resistant structural member of the comparative example shown in FIG. 14, and hardness. It is a photograph which shows the crystal structure in the built-up layer of the abrasion-resistant structural member of Example 1 shown in FIG. It is a photograph which shows the crystal structure in the build-up layer of the abrasion-resistant structural member of the comparative example shown in FIG. It is a graph which shows the result of having performed the bending test with respect to the abrasion-resistant structural member of Example 1 shown in FIG. 13, and each comparative example shown in FIG. It is a graph which shows the result of the Charpy impact test implemented by the notchless. It is a figure which shows roughly the apparatus which performs an abrasion test with respect to a test piece. It is a graph which shows the result of having done the abrasion test with the apparatus shown in FIG. 21, and shows the relationship between average hardness and 1 / wear volume ratio. It is a figure which shows the cross-sectional macro structure of the overlaying alloy which disperse | distributed WC particle | grains. The cr ₃ C ₂ particles is a diagram showing a cross-sectional macrostructure of the dispersed allowed the cladding alloy. It is a figure which shows the cross-sectional macro structure of the overlaying alloy which disperse | distributed TiC particle | grains. It is a schematic diagram which shows the manufacturing method of the other conventional abrasion-resistant structure member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Arc electrode 2 Base material 3 Molten pool 4 Hard particle 5 2nd particle 6 Forked nozzle 7 Overlay layer 11,14 Core part 12,16 Outer layer 13 Abrasion-resistant particle 15 Intermediate layer 17 Abrasion-resistant particle 26 Nozzle 31 Crawler belt 32 Link 33 Bush 34 Track pin 35 Track plate 36 Sprocket 37 Tooth groove 38 Arc electrode 39, 39 'Base material 40 Molten pool 41 Carbide particles 43, 43', 50 Overlay layer

Claims (20)

In wear-resistant particles that are dispersed in the matrix metal to improve wear resistance,
The core,
An outer layer covering the core,
Comprising
A first rigid material having a specific gravity lower than that of the mother phase metal, Ri Do a material blended with a second rigid material having a greater specific gravity than the mother phase metal,
A wear-resistant particle, wherein the outer layer has a thickness of more than 100 µm . In wear-resistant particles that are dispersed in the matrix metal to improve wear resistance,
The core,
An outer layer covering the core,
Comprising
A first rigid material having a specific gravity lower than that of the mother phase metal, Ri Do a material blended with a second rigid material having a greater specific gravity than the mother phase metal,
The matrix metal is an Fe-based material, and the first hard material is at least one of titanium carbide, titanium carbonitride, vanadium carbide, vanadium carbonitride, zirconium carbide, zirconium carbonitride, chromium carbide, and chromium carbonitride. And the second hard material includes at least one of molybdenum carbide, molybdenum carbonitride, tantalum carbide, tantalum carbonitride, tungsten carbide, and tungsten carbonitride . In wear-resistant particles that are dispersed in the matrix metal to improve wear resistance,
The core,
An outer layer covering the core,
Comprising
A first rigid material having a specific gravity lower than that of the mother phase metal, Ri Do a material blended with a second rigid material having a greater specific gravity than the mother phase metal,
The matrix metal is any one of Co-based, Ni-based and Cu-based materials, and the first hard material is titanium carbide, titanium carbonitride, vanadium carbide, vanadium carbonitride, zirconium carbide, zirconium carbonitride, chromium carbide. , Chromium carbonitride, niobium carbide, and niobium carbonitride, and the second hard material is molybdenum carbide, molybdenum carbonitride, tantalum carbide, tantalum carbonitride, tungsten carbide, and tungsten carbonitride Abrasion-resistant particles characterized by having at least one . In wear-resistant particles that are dispersed in the matrix metal to improve wear resistance,
The core,
An outer layer covering the core,
Comprising
A first rigid material having a specific gravity lower than that of the mother phase metal, Ri Do a material blended with a second rigid material having a greater specific gravity than the mother phase metal,
The wear-resistant particles, wherein the matrix metal is steel, the main component of the core is a mixture of titanium carbide or titanium carbonitride and tungsten carbide, and the main component of the outer layer is tungsten carbide. . In wear-resistant particles that are dispersed in the matrix metal to improve wear resistance,
The core,
An outer layer covering the core,
Comprising
A first rigid material having a specific gravity lower than that of the mother phase metal, Ri Do a material blended with a second rigid material having a greater specific gravity than the mother phase metal,
A wear-resistant particle characterized in that t / T is in the range of 20% to -15%, where T is the specific gravity of the matrix metal and t is the difference in specific gravity with the matrix metal . The wear-resistant particle according to any one of claims 2 to 5 , wherein the outer layer has a thickness of more than 100 µm. The wear-resistant particle according to any one of claims 1 to 3, 5, and 6, further comprising an intermediate layer disposed between the core portion and the outer layer. In according to claim 1 or 5, wherein the mother phase metal, Fe-based, Ni-based, wear particles characterized in that either a Co-based and Cu-based. Oite to claim 1, wherein a material of the mother phase metal is Fe system, the first hard material is titanium carbide, titanium carbonitride, vanadium carbide, vanadium carbide nitride, zirconium carbide, carbonitride, zirconium, chromium carbide, and It has at least one of chromium carbonitride, and the second hard material has at least one of molybdenum carbide, molybdenum carbonitride, tantalum carbide, tantalum carbonitride, tungsten carbide, and tungsten carbonitride. Wear-resistant particles. Oite to claim 1, wherein the mother phase metal is Co-based, Ni-based, is any of Cu-based material, the first hard material is titanium carbide, titanium carbonitride, vanadium carbide, vanadium carbide nitride, zirconium carbide , Zirconium carbonitride, chromium carbide, chromium carbonitride, niobium carbide, and niobium carbonitride, and the second hard material is molybdenum carbide, molybdenum carbonitride, tantalum carbide, tantalum carbonitride, tungsten carbide , And at least one of tungsten carbonitride. Oite to claim 1, wherein a mother phase metal is steel, which main component of the core portion was blended tungsten carbide and titanium carbide or titanium nitride, that the main component of the outer layer is a tungsten carbide Wear-resistant particles characterized by. In any one of claims 1 to from 4,9 11, the specific gravity of the mother phase metal is T, when the difference in specific gravity between the matrix metal and t, t / T is 20% to-15% Wear-resistant particles characterized by being in the range of A matrix metal,
Wear- resistant particles that improve wear resistance dispersed in the matrix metal;
Equipped with,
The wear-resistant particles include a core portion and an outer layer covering the core portion, a first hard material having a specific gravity smaller than that of the matrix metal, and a second hard material having a specific gravity larger than that of the matrix metal. It consists of materials blended with materials,
The wear- resistant structural member, wherein the matrix metal is a wear-resistant buildup layer, and the wear-resistant buildup layer is built up on a base material . A matrix metal,
Wear- resistant particles that improve wear resistance dispersed in the matrix metal;
Equipped with,
The wear-resistant particles include a core portion and an outer layer covering the core portion, a first hard material having a specific gravity smaller than that of the matrix metal, and a second hard material having a specific gravity larger than that of the matrix metal. It consists of materials blended with materials,
The cross section of the matrix metal along the substantially gravitational direction is separated in a vertical area of 1/2 by a line perpendicular to the gravitational direction, and the number of the wear-resistant particles present in the upper layer of the cross section is determined. A wear-resistant structural member , wherein a / b is 0.38 or more, where a is a and b is the number of wear-resistant particles present in the lower layer of the cross section . A matrix metal,
Wear- resistant particles that improve wear resistance dispersed in the matrix metal;
A wear-resistant structural member comprising :
The wear-resistant particles include a core portion and an outer layer covering the core portion, a first hard material having a specific gravity smaller than that of the matrix metal, and a second hard material having a specific gravity larger than that of the matrix metal. It consists of materials blended with materials,
The wear-resistant structural members include crusher tooth plate, hammer, shear blade, cheek plate, slip feeder bar, bit, bulldozer track bush, sprocket teeth, shoe lug, hydraulic excavator bucket, tooth adapter, lip, tooth Wear resistance characterized by being used for shrouds, corner guards, cutting edges of GET (Ground Engaging Tool) parts, end bits, teeth, ripper points, protectors, wear plates, shanks, and trash compactors. Structural member. A matrix metal,
The wear-resistant particles according to any one of claims 1 to 12 , dispersed in the matrix metal,
A wear-resistant structural member characterized by comprising: The wear-resistant structural member according to claim 16 , wherein the matrix metal in which the wear-resistant particles are dispersed is a wear-resistant buildup layer, and the wear-resistant buildup layer is built up on the base material. According to claim 16 or 17, a cross section along a substantially gravity direction in the mother phase metal, up and down by a line perpendicular to substantially gravitational direction to separate the area of the halves, present in the upper layer of the cross section A wear-resistant structural member, wherein a / b is 0.38 or more, where a is the number of wear-resistant particles and b is the number of wear-resistant particles present in the lower layer of the cross section. The wear-resistant structural member according to any one of claims 13, 14, and 18 , wherein the hardness of each of the upper layer and the lower layer in the matrix metal is Hv 700 to 1000. The wear-resistant structural member according to any one of claims 13, 14, 16 to 19 includes a crusher tooth plate, a striker, a shear blade, a cheek plate, a slip feeder bar, a bit, a bulldozer track bush, a sprocket tooth, Shoe lugs, excavator buckets, tooth adapters, lips, tooth shrouds, corner guards, cutting edges of GET (Ground Engaging Tool) parts, end bits, teeth, ripper points, protectors, wear plates, shank, trash compactor wheels A wear-resistant structural member characterized by being used in any of choppers.