CN111850546B - Method for repairing nickel-aluminum bronze part through laser cladding and product thereof - Google Patents
Method for repairing nickel-aluminum bronze part through laser cladding and product thereof Download PDFInfo
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- CN111850546B CN111850546B CN202010601518.6A CN202010601518A CN111850546B CN 111850546 B CN111850546 B CN 111850546B CN 202010601518 A CN202010601518 A CN 202010601518A CN 111850546 B CN111850546 B CN 111850546B
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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Abstract
The invention belongs to the technical field of laser cladding repair and discloses a method for repairing a nickel-aluminum bronze part by laser cladding. The method comprises the following steps: s1, milling the defect area of the nickel-aluminum bronze part to be repaired to form a U-shaped groove; s2, performing reciprocating backing cladding on the inner surface of the U-shaped groove by using high-power laser, so as to form a backing cladding layer on the inner surface of the U-shaped groove; s3, performing layer-by-layer reciprocating deposition cladding on the bottoming cladding layer by adopting low-power laser to fill the U-shaped groove, and performing surface treatment on the surface of the filled U-shaped groove to repair the nickel-aluminum bronze part to be repaired. By the method and the device, the residual stress of the repair area is reduced, so that the defects of deformation, cracks and the like are avoided. High-hardness laser deposition state tissues can be obtained in the repair area.
Description
Technical Field
The invention belongs to the technical field related to laser cladding, and particularly relates to a method for repairing a nickel-aluminum bronze part through laser cladding and a product thereof.
Background
Aluminum bronze has high strength, hardness and good wear resistance and is widely used in various industrial fields. In practice, to meet different requirements, certain amounts of alloying elements are often added to aluminum bronze to improve its properties. The nickel-aluminum bronze is aluminum bronze taking iron, nickel and manganese as main alloy elements. The addition of iron and nickel can obviously refine grains, improve mechanical properties and simultaneously inhibit the formation and meshing of gamma phases, thereby obtaining excellent corrosion resistance. A small amount of manganese can improve the fluidity of the nickel-aluminum bronze melt and reduce the slow cooling brittleness of the nickel-aluminum bronze melt.
The nickel-aluminum bronze has good mechanical property, corrosion resistance and high-temperature oxidation resistance, and is widely applied to the fields of ship propellers, seawater systems (pumps and valves), explosion-proof equipment and the like. Some nickel-aluminum bronze parts can have local failures such as cavitation erosion, abrasion, stress corrosion cracks and the like in the use process, however, the parts working in the fields are high in manufacturing cost and long in replacement period, so that the parts which are locally failed are repaired in time and the service performance of the parts is recovered, and the method has important economic benefits and strategic significance.
However, nickel-aluminum bronze has excellent heat conductivity, and is difficult to form a stable molten pool, and when surfacing repair is performed by using an electric arc as a heat source, a large heat input is often required, so that a heat affected zone is large and parts deform. When spraying or electric spark deposition repairing is carried out, the repairing layer is thin and the bonding strength with the matrix is low. The laser cladding repair using laser as a heat source has the characteristics of high forming precision, small heat affected zone, good processing flexibility and the like, but when the method is applied to nickel-aluminum bronze, the problems that alloy powder needs to be specially customized, the reflectivity of a base material to laser is too high, the thermal expansion rate is too high, cracks are easily generated in the repair process and the like exist in urgent need.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method for repairing a nickel-aluminum bronze part by laser cladding and a product thereof, wherein two commercialized alloy powders are mixed according to a certain proportion to quickly prepare the alloy powder with good compatibility with a nickel-aluminum bronze base material, and a U-shaped groove is milled in a failure area with abrasion, cracks and the like; remelting the surface of the base material by laser before repairing to preheat the base material; performing high-power reciprocating bottoming cladding on the bottom of the groove and interfaces on two sides to obtain a cladding layer with larger fusion depth, so that the connection strength with the base material is enhanced; and then carrying out reciprocating scanning deposition with lower power in the middle area of the U-shaped groove, preheating the base metal by adopting laser remelting and cladding by adopting low-power laser in the repairing process so as to reduce the total heat input amount, and increasing high-temperature retention time by adopting a reciprocating scanning path so as to be beneficial to reducing the residual stress of the repairing area in a stress release mode and the like, so that the defects of deformation, cracks and the like are avoided, a high-hardness laser deposition state tissue is obtained in the repairing area, and the wear resistance of parts is improved.
To achieve the above object, according to one aspect of the present invention, there is provided a method for repairing a nickel-aluminum bronze part by laser cladding, the method comprising the steps of:
s1, milling the defect area of the nickel-aluminum bronze part to be repaired to form a U-shaped groove;
s2, performing reciprocating backing cladding on the inner surface of the U-shaped groove by using high-power laser, so as to form a backing cladding layer on the inner surface of the U-shaped groove;
s3, performing layer-by-layer reciprocating cladding on the bottoming cladding layer by adopting low-power laser to fill the U-shaped groove, and performing surface treatment on the surface of the filled U-shaped groove to repair the nickel-aluminum bronze part to be repaired.
Further preferably, before step S2, the inner surface of the U-shaped groove needs to be remelted by laser, so as to eliminate defects during milling the inner surface of the U-shaped groove, and preheat the inner surface of the U-shaped groove.
Further preferably, when the inner surface of the U-shaped groove is remelted by laser, the laser scanning speed is 0.008m/s to 0.012m/s, and the power is 2000W to 2500W.
More preferably, the laser power of the high power laser is 2300W to 2600W in step S2, and the laser power of the low power laser is 1500W to 2000W in step S3.
Further preferably, the materials adopted for laser backing cladding and layer-by-layer reciprocating deposition cladding in S2 and S3 are mixed powder obtained by ball milling and mixing Cu10Al powder and invar36 powder, and the weight ratio of Cu10Al powder to invar36 powder in the mixed powder is (90-110): (9-13), wherein the mass fraction of Al in the Cu10Al powder is 9-11%, and the balance is Cu and inevitable impurities; the mass fraction of Ni in the invar36 powder is 35-37%, the balance is Fe and inevitable impurities, and the particle size ranges of the Cu10Al powder and the invar36 powder are both 45-105 μm.
Further preferably, the rotation speed of the roller mill for ball milling and mixing is preferably 300r/min to 350r/min, and the mixing time is 6h to 8 h.
Further preferably, when laser backing cladding and layer-by-layer reciprocating deposition cladding are carried out in S2 and S3, the powder feeding speed is 15 g/min-20 g/min, the scanning speed is 0.006 m/S-0.012 m/S, and the laser is negatively defocused.
Further preferably, in step S1, the included angle between the two side surfaces of the U-shaped groove is 60 ± 2 °.
Further preferably, in steps S2 and S3, the laser is Nd-YAG laser, the spot diameter is 2mm to 3mm, and the laser remelting, priming cladding and deposition cladding are all performed under the protection of argon gas.
According to another aspect of the invention, a product obtained by the method for repairing the nickel-aluminum bronze part through laser cladding is provided.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the invention, the copper alloy is repaired by using the laser cladding technology, the energy is concentrated, the heat affected zone is small, the size and the position of the cladding layer can be accurately controlled, the commercialized Cu10Al powder and invar36 powder are used for quickly preparing the repair material which is well compatible with the nickel-aluminum bronze, the copper-based alloy powder does not need to be specially customized, and the time cost and the economic cost of repair are greatly reduced;
2. the method carries out slotting repair on the failure area of the part to be repaired, remelting, high-power bottoming cladding and low-power reciprocating cladding are carried out in sequence in the U-shaped groove to obtain a compact crack-free repair area which is well combined with the base material, and simultaneously, the deformation of parts and the cracking caused by residual stress caused by overlarge heat input are avoided, the tissue of the repair area is in a laser deposition state and is fine, so that the method has higher hardness and more excellent wear resistance, slotting repair is carried out in the failure area, the method is suitable for repairing large-size failures, the combination area of the repair area and the base material is increased, the tensile strength of a cladding layer can reach 877-992 MPa, the hardness can reach 198 + 210HB, and the wear resistance is good.
Drawings
FIG. 1 is a flow chart of a method of laser cladding repair of nickel aluminum bronze constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of a U-shaped channel constructed in accordance with a preferred embodiment of the present invention;
FIG. 3 is a top view of a U-shaped channel constructed in accordance with a preferred embodiment of the present invention;
fig. 4 is a schematic illustration of U-groove filling constructed in accordance with a preferred embodiment of the present invention, wherein (a) is a schematic illustration of U-groove bottoming cladding, (b) is a schematic illustration of cladding in the middle region of U-groove, and (c) is a schematic illustration of the path of cladding in the middle region of U-groove;
fig. 5 is a microstructure of a filled U-shaped groove constructed according to a preferred embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, a method for repairing nickel-aluminum bronze by laser cladding includes the following steps:
1) selecting the Cu10Al powder and the invar36 powder which are commercialized at present, and mixing the two powders according to the weight ratio of Cu10 Al: invar36 ═ (90-110): (9-13) weighing the raw materials in proportion, and then performing ball milling to obtain mixed powder;
2) milling a 60 +/-2-degree U-shaped groove in a damaged area of the base material, and cleaning the bottom and two sides of the groove by using acetone as shown in figures 2 and 3;
3) remelting the surface of the U-shaped groove by adopting laser with the power of 2000-2500W and the scanning speed of 0.008-0.012 m/s before repairing so as to remove surface processing defects of the U-shaped groove and preheat a base material, thereby reducing residual stress after repairing;
4) and performing reciprocating priming cladding on the bottom and two sides of the U-shaped groove, wherein the laser power is 2300-2600W. After the priming cladding is finished, the reciprocating cladding is started in the middle area of the U-shaped groove, the laser power is 1500-2000W, the lap joint rate is 30% -40%, and the interlayer lifting amount is 0.8-1 mm. The repairing process is schematically shown in FIG. 4;
5) and after the repair is finished, the surface of the repair area is milled and ground, and the size and tolerance precision of the repair area are recovered.
Preferably, the two original powders are spherical powders with better fluidity and the particle size is 45-105 μm. The rotating speed of the roller mill for ball milling and mixing is preferably 300 r/min-350 r/min, and the mixing time is 6-8 h. The mixed powder is dried by a drying box, the drying temperature is preferably 120-150 ℃, and the drying time is preferably 1.5-2 h.
Preferably, the laser adopts an Nd-YAG laser, the laser wavelength is 1064nm, and the spot diameter is 2-3 mm.
Preferably, the laser remelting and cladding process is done under an atmosphere of 99.99% argon.
Preferably, the powder feeding speed is 15 g/min-20 g/min, the scanning speed is 0.006-0.012 m/s, and the laser negative defocuses in the laser cladding process.
Preferably, the tensile strength of the cladding layer can reach 877-992 Mpa, the hardness can reach 198-210HB, and the cladding layer has good wear resistance.
The present invention will be further illustrated with reference to specific examples.
Example 1
The QAL10-4-4 nickel-aluminum bronze has stable mechanical properties, is commonly used for high-strength wear-resistant parts, such as bearings, flange plates and the like, selects a QAL10-4-4 nickel-aluminum bronze plate, simulates the generation of cracks, performs slotting and cleaning in a failure area, takes 60mm, 15mm and 6mm for l, b and h of a U-shaped groove respectively, and performs laser cladding repair, and specifically comprises the following steps:
s1: powder weight is as follows Cu10 Al: invar36 ═ 90: 13, wherein the mass fraction of Al in the Cu10Al copper alloy powder is 9-11%, and the balance is Cu and inevitable impurities; the Invar36 alloy powder comprises, by mass, 35-37% of Ni and the balance of Fe and inevitable impurities, the chemical components of the mixed alloy powder are 7.0% of Al, 4.5% of Ni and 7.9% of Fe, and the balance of Cu element and inevitable impurities, and the particle size ranges of the Cu10Al powder and the Invar36 powder are both 45-105 μm.
S2: the mixing method is ball milling mixing, the weighed powder is put into a mixing bottle containing steel balls, and then the mixing is carried out in a ball milling roller machine for 6 hours, wherein the rotating speed of the roller machine is 300 r/min.
S3: remelting the surface of the U-shaped groove by using laser with the power of 2000W and the scanning speed of 0.008m/s before laser cladding repair, wherein the scanning direction is reciprocating scanning. Performing reciprocating bottoming cladding on the bottom and two sides of the U-shaped groove after remelting, wherein the process parameters are as follows: the power is 2300W, the scanning speed is 0.006m/s, the powder feeding speed is 15g/min, and the lapping rate is 30 percent. And after the bottoming cladding is finished, carrying out reciprocating cladding in the middle area of the groove, wherein the laser power is 1500W, the lifting amount between layers is 0.8mm, other process parameters are consistent with the bottoming cladding process, the lasers are all Nd-YAG lasers, the diameters of light spots are 2-3 mm, and laser remelting and laser cladding are carried out under the protection of argon.
S4: and (5) milling and grinding the part of the repair area higher than the base material to recover the size and tolerance requirements. The hardness of the repair area cladding layer is 187-198 HB. FIG. 5 shows the microstructure of the filled U-shaped groove of this example.
Example 2
The QAL10-4-4 nickel-aluminum bronze has stable mechanical properties, is commonly used for high-strength wear-resistant parts, such as bearings, flange plates and the like, selects a QAL10-4-4 nickel-aluminum bronze plate, simulates the generation of cracks, performs slotting and cleaning in a failure area, takes 60mm, 15mm and 6mm for l, b and h of a U-shaped groove respectively, and performs laser cladding repair, and specifically comprises the following steps:
s1: powder weight is as follows Cu10 Al: invar36 ═ 110: 9, wherein the mass fraction of Al in the Cu10Al copper alloy powder is 9-11%, and the balance is Cu and inevitable impurities; the Invar36 alloy powder comprises, by mass, 35-37% of Ni, the balance being Fe and inevitable impurities, the chemical components of the mixed alloy powder are 7.4% of Al, 2.7% of Ni and 4.7% of Fe, and the balance being Cu element and inevitable impurities, and the particle sizes of the Cu10Al powder and the Invar36 powder are both 45-105 μm.
S2: the mixing method is ball milling mixing, the weighed powder is put into a mixing bottle containing steel balls, and then the mixture is put into a ball milling roller machine for mixing for 6 hours, wherein the rotating speed of the roller machine is 350 r/min.
S3: remelting the surface of the U-shaped groove by using laser with the power of 2500W and the scanning speed of 0.012m/s before laser cladding repair, wherein the scanning direction is reciprocating scanning. Performing reciprocating bottoming cladding on the bottom and two sides of the U-shaped groove after remelting, wherein the process parameters are as follows: the power is 2300W, the scanning speed is 0.008m/s, the powder feeding speed is 18g/min, and the lapping rate is 35 percent. Carrying out reciprocating cladding in the middle area of the groove after the bottoming cladding is finished, wherein the laser power is 1800W, the interlayer lifting amount is 1mm, other process parameters are consistent with the bottoming cladding process, the lasers are all Nd-YAG lasers, the diameters of light spots are 2-3 mm, and laser remelting and laser cladding are carried out under the protection of argon gas
S4: and (5) milling and grinding the part of the repair area higher than the base material to recover the size and tolerance requirements. The hardness of the repair area cladding layer is 196 HB-207 HB.
Example 3
C95800 Nickel-aluminum bronze is commonly used for wear-resistant parts working under high load and high sliding speed, such as connecting rods, bearing bushes, worm gears and the like. Selecting a C95800 nickel-aluminum bronze plate, simulating the C95800 nickel-aluminum bronze plate to generate large-area abrasion, then grooving and cleaning a damaged area, respectively taking 80mm, 60mm and 3mm for l, b and h of a VU-shaped groove, and then carrying out laser material increase cladding repair, specifically comprising the following steps:
s1: powder weight is as follows Cu10 Al: invar36 ═ 10: 1, wherein the mass fraction of Al in the Cu10Al copper alloy powder is 9-11%, and the balance is Cu and inevitable impurities; the Invar36 alloy powder comprises 35-37% of Ni by mass and the balance of Fe and inevitable impurities, the chemical components of the mixed alloy powder comprise 7.3% of Al, 3.3% of Ni and 5.7% of Fe, and the balance of Cu element and inevitable impurities, and the particle size ranges of the Cu10Al powder and the Invar36 powder are both 45-105 micrometers.
S2: the mixing method is ball milling mixing, the weighed powder is put into a mixing bottle containing steel balls, and then the mixing is carried out in a ball milling roller machine for 8 hours, wherein the rotating speed of the roller machine is 300 r/min.
S3: before laser cladding repair, remelting the surface of the U-shaped groove by using laser with the power of 2300W and the scanning speed of 0.01m/s, wherein the scanning direction is reciprocating scanning. Performing reciprocating bottoming cladding on the bottom and two sides of the U-shaped groove after remelting, wherein the process parameters are as follows: the power is 2500W, the scanning speed is 0.01m/s, the powder feeding speed is 16g/min, and the lapping rate is 40%. And after the bottoming cladding is finished, carrying out reciprocating cladding in the middle area of the groove, wherein the laser power is 2000W, the lifting amount between layers is 0.9mm, other process parameters are consistent with the bottoming cladding process, the lasers are all Nd-YAG lasers, the diameters of light spots are 2-3 mm, and laser remelting and laser cladding are carried out under the protection of argon.
S4: and (5) milling and grinding the part of the repair area higher than the base material to recover the size and tolerance requirements. The hardness of the repair area cladding layer is 190-202 HB.
Example 4
C95800 Nickel-aluminum bronze is commonly used for wear-resistant parts working under high load and high sliding speed, such as connecting rods, bearing bushes, worm gears and the like. Selecting a C95800 nickel-aluminum bronze plate, simulating the C95800 nickel-aluminum bronze plate to generate large-area abrasion, then grooving and cleaning a damaged area, respectively taking 80mm, 60mm and 3mm for l, b and h of a VU-shaped groove, and then carrying out laser material increase cladding repair, specifically comprising the following steps:
s1: powder weight is as follows Cu10 Al: invar36 ═ 110: 13, wherein the mass fraction of Al in the Cu10Al copper alloy powder is 9-11%, and the balance is Cu and inevitable impurities; the Invar36 alloy powder comprises 35-37% of Ni by mass and the balance of Fe and inevitable impurities, the chemical components of the mixed alloy powder are 7.2% of Al, 3.8% of Ni and 6.6% of Fe, and the balance of Cu element and inevitable impurities, and the particle size ranges of the Cu10Al powder and the Invar36 powder are both 45-105 micrometers.
S2: the mixing method is ball milling mixing, the weighed powder is put into a mixing bottle containing steel balls, and then the mixing is carried out in a ball milling roller machine for 8 hours, wherein the rotating speed of the roller machine is 350 r/min.
S3: before laser cladding repair, remelting the surface of the U-shaped groove by using laser with the power of 2000W and the scanning speed of 0.009m/s, wherein the scanning direction is reciprocating scanning. Performing reciprocating bottoming cladding on the bottom and two sides of the U-shaped groove after remelting, wherein the process parameters are as follows: the power is 2500W, the scanning speed is 0.012m/s, the powder feeding speed is 18g/min, and the lapping rate is 35 percent. And performing reciprocating cladding in the middle area of the groove after the bottoming cladding is finished, wherein the laser power is 1800W, the interlayer lifting amount is 0.8mm, other process parameters are consistent with the bottoming cladding process, the lasers are all Nd-YAG lasers, the diameters of light spots are 2-3 mm, and laser remelting and laser cladding are performed under the protection of argon.
S4: and (5) milling and grinding the part of the repair area higher than the base material to recover the size and tolerance requirements. The hardness of the repair area cladding layer was 183-199 HB.
Example 5
Selecting a QAL10-5-5 nickel-aluminum bronze plate, simulating the generation of cracks, grooving and cleaning a damaged area, respectively taking 90 mm, 30mm and 10mm for l, b and h of a V-shaped groove, and then carrying out laser cladding repair, wherein the method specifically comprises the following steps:
s1: powder weight is as follows Cu10 Al: invar36 ═ 9: 1, wherein the mass fraction of Al in the Cu10Al copper alloy powder is 9-11%, and the balance is Cu and inevitable impurities; the Invar36 alloy powder comprises 35-37% of Ni by mass and the balance of Fe and inevitable impurities, the chemical components of the mixed alloy powder are 7.2% of Al, 3.6% of Ni and 6.3% of Fe, the balance of Cu element and inevitable impurities, and the particle size ranges of the Cu10Al powder and the Invar36 powder are both 45-105 micrometers.
S2: the mixing method is ball milling mixing, the weighed powder is put into a mixing bottle containing steel balls, and then the mixture is put into a ball milling roller machine for mixing for 7 hours, and the rotating speed of the roller machine is 320 r/min.
S3: remelting the surface of the U-shaped groove by using laser with the power of 2500W and the scanning speed of 0.01m/s before laser cladding repair, wherein the scanning direction is reciprocating scanning. Performing reciprocating bottoming cladding on the bottom and two sides of the U-shaped groove after remelting, wherein the process parameters are as follows: the power is 2600W, the scanning speed is 0.01m/s, the powder feeding speed is 20g/min, and the lapping rate is 30 percent. And performing reciprocating cladding in the middle area of the groove after the bottoming cladding is finished, wherein the laser power is 1800W, the interlayer lifting amount is 0.9mm, other process parameters are consistent with the bottoming cladding process, the lasers are all Nd-YAG lasers, the diameters of light spots are 2-3 mm, and laser remelting and laser cladding are performed under the protection of argon.
S4: and (5) milling and grinding the part of the repair area higher than the base material to recover the size and tolerance requirements. The hardness of the repair area cladding layer is 176-190 HB.
Example 6
Selecting a QAL10-5-5 nickel-aluminum bronze plate, simulating the generation of cracks, grooving and cleaning a damaged area, respectively taking 90 mm, 30mm and 10mm for l, b and h of a V-shaped groove, and then carrying out laser cladding repair, wherein the method specifically comprises the following steps:
s1: powder weight is as follows Cu10 Al: invar36 ═ 9: 1, wherein the mass fraction of Al in the Cu10Al copper alloy powder is 9-11%, and the balance is Cu and inevitable impurities; the Invar36 alloy powder comprises 35-37% of Ni by mass and the balance of Fe and inevitable impurities, the chemical components of the mixed alloy powder are 7.4% of Al, 3.0% of Ni and 5.3% of Fe, and the balance of Cu element and inevitable impurities, and the particle size ranges of the Cu10Al powder and the Invar36 powder are both 45-105 micrometers.
S2: the mixing method is ball milling mixing, the weighed powder is put into a mixing bottle containing steel balls, and then the mixture is put into a ball milling roller machine for mixing for 7 hours, and the rotating speed of the roller machine is 320 r/min.
S3: before laser cladding repair, remelting the surface of the U-shaped groove by using laser with the power of 2300W and the scanning speed of 0.008m/s, wherein the scanning direction is reciprocating scanning. Performing reciprocating bottoming cladding on the bottom and two sides of the U-shaped groove after remelting, wherein the process parameters are as follows: the power is 2600W, the scanning speed is 0.009m/s, the powder feeding speed is 18g/min, and the lapping rate is 40 percent. And after the bottoming cladding is finished, carrying out reciprocating cladding in the middle area of the groove, wherein the laser power is 1500W, the lifting amount between layers is 1mm, other process parameters are consistent with the bottoming cladding process, the lasers are all Nd-YAG lasers, the diameters of light spots are 2-3 mm, and laser remelting and laser cladding are carried out under the protection of argon.
S4: and (5) milling and grinding the part of the repair area higher than the base material to recover the size and tolerance requirements. The hardness of the repair area cladding layer is 182-201 HB.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for repairing a nickel-aluminum bronze part by laser cladding is characterized by comprising the following steps:
s1, milling a defective area of the nickel-aluminum bronze part to be repaired to form a U-shaped groove, remelting the inner surface of the U-shaped groove by adopting laser, eliminating the defects of the inner surface of the U-shaped groove in the milling process on one hand, and preheating the inner surface of the U-shaped groove on the other hand;
s2, performing reciprocating priming cladding on the inner surface of the U-shaped groove by adopting high-power laser, so as to form a priming cladding layer on the inner surface of the U-shaped groove, wherein the laser power of the high-power laser is 2300-2600W, and the diameter of a laser spot is 2-3 mm;
s3, performing layer-by-layer reciprocating deposition cladding on the bottoming cladding layer by adopting low-power laser, filling the U-shaped groove with the laser, and performing surface treatment on the surface of the filled U-shaped groove to further realize the repair of the nickel-aluminum bronze part to be repaired, wherein the laser power of the low-power laser is 1500-2000W, and the diameter of a laser spot is 2-3 mm;
the materials adopted when laser backing cladding and layer-by-layer reciprocating deposition cladding are carried out in S2 and S3 are mixed powder obtained by ball milling and mixing Cu10Al powder and invar36 powder, and the weight ratio of the Cu10Al powder to the invar36 powder in the mixed powder is (90-110): (9-13), wherein the mass fraction of Al in the Cu10Al powder is 9-11%, and the balance is Cu and inevitable impurities; the mass fraction of Ni in the invar36 powder is 35-37%, the balance is Fe and inevitable impurities, and the particle size ranges of the Cu10Al powder and the invar36 powder are both 45-105 μm.
2. The method for repairing the nickel-aluminum bronze part through laser cladding as claimed in claim 1, wherein when remelting is performed on the inner surface of the U-shaped groove by using laser, the speed of laser scanning is 0.008m/s to 0.012m/s, and the power is 2000W to 2500W.
3. The method for repairing the nickel-aluminum bronze part through laser cladding as claimed in claim 1, wherein the rotation speed of the roller mill for ball milling and mixing is preferably 300r/min to 350r/min, and the mixing time is 6h to 8 h.
4. The method for repairing nickel-aluminum bronze parts by laser cladding as claimed in claim 1, wherein when laser priming cladding and layer-by-layer reciprocating deposition cladding are performed in S2 and S3, the powder feeding speed is 15g/min to 20g/min, the scanning speed is 0.006m/S to 0.012m/S, and the laser is negatively defocused.
5. The method for repairing a nickel-aluminum bronze part by laser cladding according to claim 1, wherein in step S1, the included angle between the two side surfaces of the U-shaped groove is 60 ± 2 °.
6. The method for repairing the nickel-aluminum bronze part through laser cladding according to claim 1, wherein in steps S2 and S3, an Nd-YAG laser is adopted as the laser, and the laser remelting, the priming cladding and the deposition cladding are performed under the protection of argon.
7. The product obtained by the method for repairing the nickel-aluminum bronze part through laser cladding as set forth in any one of claims 1 to 6.
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| CN102909325B (en) * | 2012-11-12 | 2014-07-16 | 南昌航空大学 | Laser-induction compounded cladding method for repairing continuous casting crystallizer |
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