CN107760956A - A kind of hard alloy and local laser coated cemented carbide technique - Google Patents
A kind of hard alloy and local laser coated cemented carbide technique Download PDFInfo
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- CN107760956A CN107760956A CN201710554556.9A CN201710554556A CN107760956A CN 107760956 A CN107760956 A CN 107760956A CN 201710554556 A CN201710554556 A CN 201710554556A CN 107760956 A CN107760956 A CN 107760956A
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- 239000000956 alloy Substances 0.000 title claims abstract description 58
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005253 cladding Methods 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 27
- 239000011159 matrix material Substances 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 20
- 238000004372 laser cladding Methods 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 11
- 238000011282 treatment Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000008646 thermal stress Effects 0.000 abstract description 5
- 238000010790 dilution Methods 0.000 abstract description 3
- 239000012895 dilution Substances 0.000 abstract description 3
- 238000005552 hardfacing Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 229910052796 boron Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910003470 tongbaite Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000013532 laser treatment Methods 0.000 description 1
- 230000007786 learning performance Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
-
- C—CHEMISTRY; METALLURGY
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a kind of hard alloy and local laser coated cemented carbide technique, belong to metallic hardfacing processing technology field.The hard alloy, each composition is as follows in percentage by weight：Cr：20~27；W：10~14；C：1.5~2.5；Ni：21~23；Fe：1；Si：0.8~1；B：1；Re：1.5；Surplus is Co, and the hard alloy is powdered and powder size is 40-200um.The powder alloy material that the present invention uses and matrix material compatibility are preferable, cladding layer dilution rate is smaller and similar thermal expansion coefficient, after pretreatment and rear Technology for Heating Processing are carried out to matrix and cladding layer, further reduce thermograde, reduce in cladding layer in thermal stress, and then the generation of Crack prevention and alloy-layer obscission, unstable problem is combined with parent metal so as to solve the alloy-layer coated in the prior art, there is the characteristics of hardness is high, anti-wear performance is good.
Description
Technical field
The invention belongs to metallic hardfacing processing technology field, more specifically to a kind of hard alloy and part
Coating produced by laser cladding hard alloy process.
Background technology
It is more and more extensive in underground engineering field, the application of shield construction.Tunnel digging of the shield construction in hard rock section
Enter to be widely used.Shield machine in underground engineering is bulky, weight is big, and underground activities space is limited, shield machine knife during work
Disc spins drive various cutters completions thereon to the excavation of the soil body.Shield machine roller cutter cutter hub, upper and lower covers be directly with landwaste, rock
The part of contact, abrasion easily occurs during operation and needs to change in time.The quality of hobboing cutter cutter hub and upper and lower covers directly influences shield
Rock breaking capacity, drivage efficiency and the excavating cost of structure machine, are the deciding factors for influenceing shield machine performance, thus shield machine roller cutter
Cutter hub and upper and lower covers need to have very high anti-wear performance.Hobboing cutter cutter hub and upper and lower covers coat wear-resistant alloy layer to improve the resistance to of hobboing cutter
Grinding performance reduces the degree of wear of the hobboing cutter during excavation as one of major technique for improving hobboing cutter cutter anti-wear performance, passes
The coated cemented carbide technique of system carries out bar or powder deposition for oxyacetylene torch, gas shield tungsten electrode or argon arc deposits,
Water inlet submerged-arc welding, plasma spray coating etc., the hard alloy layer of process above coating are combined insecure, interior thermal stress with parent metal
Greatly, easily produce stomata, be mingled with coating cracking phenomenon, toughness and tenacity is not high, easy chip off-falling during use, and high temperature,
Anti-wear performance under high-speed working condition is poor, in addition, the matrix meeting in gas shield tungsten electrode or argon arc depositing operation below built-up welding
Crack, have a strong impact on the safe to use and life-span of cutter head of shield machine.
Chinese invention patent, publication number：CN102168210A, publication date：On August 31st, 2011, discloses a kind of laser
Melting and coating process method and its alloy material, by weight percentage its composition are as follows：C：0.85~0.98%, Cr：35~45%,
Fe：3~5%, Si：0.5~1.0%, W：3.5~5.5%, Mo：1.0~1.5%, Ni：6~8%, V：1.5~2.0%, Ti：
1.0~2.0%, B：0.5~1.5%, Nb：0.10~0.50%, Re：0.5~1.5%, Co：Surplus.One kind is also disclosed to adopt
With the laser melting and coating process method of alloy material as described above.The technical program melts under the comprehensive function of institute's additional element
Coating even tissue, it is tiny；Pore-free, without be mingled with, without slag inclusion, do not have to preheating during blade cladding, be more not in crackle.Have
Higher hardness is not required to, through follow-up heat treatment, after can directly finishing make with good cavitation resistive property, the part of cladding
With the Technological adaptability of laser treatment is preferable, and operation is simple.Its weak point is：Multielement heterogeneous alloy layer was used,
Thermograde is big, and thermal stress is high in cladding layer, and interior tissue is unstable.
Chinese invention patent, publication number：CN104195546A, publication date：On December 10th, 2014, disclose laser melting coating
With high rigidity Co-based alloy powder and its preparation technology.Its concrete technical scheme is：A kind of laser melting coating high rigidity cobalt-based
Alloyed powder, each composition by weight percent concentration are：C：1.2-1.55%；Cr：28-31%；Fe：≤ 3%；Mn：≤ 0.5%；Mo：
≤ 1%；Ni：≤ 3%；Si：0.7-1.5%；W：3.5-6.5%；Surplus Co.Preparation process is：A, the dispensing of each composition is prepared,
Melting；B, the dispensing for entering melting in step a is subjected to slag making and deoxidation；C, the dispensing by step b processing is manufactured into powder
Last shape；D, the powdered ingredient in step c is collected；E, will be sieved in step d through overcooled powdered ingredient.
Using above-mentioned technical proposal, there is provided one kind is not susceptible to ftracture, aoxidizes, produces stomata, and the good laser melting coating of self-fluxing nature is high
Hardness Co-based alloy powder and its preparation technology.Its weak point is：Lack tough group of rare earth element Re and a small amount of B element
Close, excessive energy density increases the dilution rate for causing cladding layer, is also easy to produce cladding layer cracking and matrix deformation.
Chinese invention patent, publication number：CN101705487B, publication date：On July 4th, 2012, disclose turbine one of restriking
The preparation method of level work blade tip wear-resistant coating, is carried out according to the following steps：(1) infrared scan of coating produced by laser cladding equipment is utilized
Device is scanned to blade tip end face edge, makes the program control program writing scan point position in scanning track；(2) start laser to apply
The generating device of laser of coating equipment, under the conditions of inert gas shielding, alloy powder is transmitted to leaf apex end surface, and melted with laser beam
Alloy powder.Described alloy powder is Co base self-fluxing alloy powders, and its composition is C1.0~1.3% by weight percentage,
Cr28.0~30.0%, Si1.0~1.3%, Fe3.0~3.2%, W3.8~4.3%, Ni2.8~3.0%, surplus Co；Institute
The wear-resistant coating mean breadth stated is 1.9~2.5mm, and average thickness is 2~3mm；Described protective gas is argon gas, is protected
Air pressure during shield is 0.2~0.35MPa.Its weak point is：The hard phase burn rate such as cladding layer coarse grains, particularly WC adds
Greatly, alloy-layer easily ftractures, toughness and tenacity deficiency.
The content of the invention
1st, to solve the problems, such as
Unstable problem is combined with parent metal for the alloy-layer coated in the prior art, the present invention provides a kind of hard
Matter alloy and local laser coated cemented carbide technique.It causes the alloy-layer of coating to have higher hardness and anti-wear performance,
And the alloy-layer coated is tightly combined with parent metal, tough combination is without the chip off-falling that ftractures.
2nd, technical scheme
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of hard alloy, it is characterised in that each composition is as follows in percentage by weight：Cr：20~27；W：10~
14；C：1.5~2.5；Ni：21~23；Fe：1；Si：0.8~1；B：1；Re：1.5；Surplus is Co, and the hard alloy is powder
Shape and powder size are 40-200um.
Further, each composition is as follows in percentage by weight：Cr：25；W：12；C：2；Ni：22；Fe：1；Si：1；B:
1；Re：1.5；Surplus is Co.
A kind of local laser coated cemented carbide technique, is entered using the hard alloy described in claim 1 or claim 2
Row laser melting coating, processing step are：
Step 1：Matrix material the pre-heat treatment, by matrix material be heated to 460 DEG C insulation 2 hours after air cooling, then again
Be heated to 180 DEG C insulation 4 hours after air cooling；
Step 2：Laser Cladding Treatment, utilize the laser beam melts claim 1 or claim 2 of coating produced by laser cladding equipment
Described hard alloy, spot diameter 6mm, power 4KW, laser scanning speed 5mm/s, substrate material surface are formed molten
Coating thickness is 1mm；
Step 3：Cladding layer is heat-treated, and the alloy-layer of substrate material surface cladding is heated into 280 DEG C, is incubated 3.5 hours
Air cooling afterwards；
Step 4：Sanding and polishing, the alloy-layer of substrate material surface cladding is polished, polished.
Further, the step 2 is carried out in protective atmosphere.
Further, carry out that cemented carbide powder is previously placed in into matrix first during Laser Cladding Treatment in the step 2
Material treats cladding position, is then scanned using laser beam.
Further, substrate material surface is acted on when Laser Cladding Treatment is carried out in the step 2 in laser emission
Meanwhile cemented carbide powder is sent directly into laser action area, keep feed is synchronous with cladding to carry out.
3rd, beneficial effect
Compared to prior art, beneficial effects of the present invention are：
(1) hard alloy provided by the invention, reasonable disposition alloying component, closed using this composition and the hard of proportioning
The cladding layer that gold carries out coating produced by laser cladding acquisition is tightly combined with matrix material, and surface fused coating hardness is HRC50-72, thus is had
There is the premium properties that hardness is high, anti-wear performance is good；
(2) hard alloy provided by the invention, rare earth element are favorably improved the toughness and tenacity of alloy-layer, and alloy-layer
Wearability and self-fluxing nature, and help to purify alloy solution, while the tissue crystal grain of refining alloy layer, improve alloy-layer mechanics
Performance, the tramp elements such as H/O/S are eliminated, reduce oxidation tendency of the alloy under liquid and solid-state, cladding layer has flawless, nothing
The advantages that stomata, free from admixture；
(3) hard alloy provided by the invention, the alloy powder Task-size Controlling of configuration is in 40-200um, good flowing properties,
Si and B element have deoxidation, fluxing effect, prevent that liquid metal is excessively polyoxygenated, Hardmetal materials of the invention and matrix material
Material there is good compatibility, dilution rate is small, cladding layer homogenize degree height, and matrix material with formation cladding layer it is hot swollen
Swollen coefficient similar, help avoid the generation of crackle and coming off for alloy-layer；
(4) local laser coated cemented carbide technique provided by the invention, matrix material and cladding layer are carried out respectively pre-
Heat treatment and rear heat treatment, help to eliminate stress caused by processing and fabricating, to the base after alloy cladding to substrate preheating processing
Body carries out stress tempering processing, helps to reduce thermograde, reduces the inherent thermal stress of cladding layer, and then avoid crackle
Produce；
(5) local laser coated cemented carbide technique provided by the invention, in protective atmosphere, such as inert gas gas
Atmosphere, carry out Laser Cladding Treatment effectively can occur in the reaction such as anti-oxidation, decarburization.
Embodiment
The present invention is further described below with reference to specific embodiment.
Embodiment 1
A kind of hard alloy, each composition is as follows in percentage by weight：Cr：20；W：10；C：1.5；Ni：21；Fe：1；
Si：0.8；B：1；Re：1.5；Surplus is Co, and the hard alloy is powdered and powder size is 40-200um, the present embodiment
Middle cemented carbide powder granularity is 200um.
During using Laser Cladding Carbide Hard technique, on the one hand because laser energy density is big, cause to melt in cladding process
The temperature in pond is high, and molten bath condenses rapidly after laser beam away, and the alloying element such as Si, B can not effectively float, most of to turn into crisp
Property element is retained in cladding layer, causes the crack sensitivity of cladding layer to increase, alloyed layer hardness is not high；On the other hand,
Alloy-layer is combined insecure with the larger alloy-layer for causing to coat of matrix coefficient of expansion difference with parent metal.The present embodiment it is hard
Si, B content are reduced in matter alloy, to reduce the crack sensitivity of cladding layer.In addition, the Element Species of the present embodiment selection addition
Class and content ensure that the thermal coefficient of expansion of alloy coat close to parent metal thermal coefficient of expansion, reduce the thermal stress of alloy-layer
With residual stress, ensure that alloy-layer is tightly combined with matrix material, and alloy-layer is not likely to produce crackle.
Micro- metallurgical reaction is carried out in laser cladding process in molten bath, the WC of generation has the characteristics of hardness is high, is alloy-layer
The main material on top layer, and Co elements promote alloy-layer and the mutual of matrix to melt, and improve bond strength, prevent coating shedding.Swash
In light cladding process, Ni and Cr forms intermetallic compound, and discharges amount of heat, promotes alloy-layer to be formed with matrix surface
Micro metallurgic bonding, further increase the bond strength of alloy-layer and matrix.Cr elements play a part of solution strengthening, passivation,
High temperature oxidation resistance and corrosion resisting property are improved, Cr elements more than needed easily form the carbide such as Cr of chromium with C element7C3、Cr3C2、
Hard phase, so as to improve alloy-layer hardness and wearability, on the other hand, Cr elements serve certain work on WC decomposition is prevented
With improving the anti-wear performance of alloy-layer.
Si elements and B element can significantly reduce alloy melting point, expand solid-liquid phase line humidity province, on the one hand ensure that alloy
There is appropriate mobility in melting, the alloy of fusing is uniformly spread out in substrate surface, form smooth surface, on the other hand
Deoxidation and reduction acts on and slag making function, promotes the hardening and reinforcing of alloy coat.
W is favorably improved the hardness of alloy-layer, so as to improve anti-wear performance；Ni helps to increase the intensity of alloy-layer and tough
Property, and cause alloy-layer that there is higher decay resistance.
Embodiment 2
A kind of hard alloy, each composition is as follows in percentage by weight：Cr：19；W：8；C：0.7；Ni：13；Fe：1；B：
1.7；Re：1.5；Surplus is Co, and the hard alloy is powdered and powder size is 40-200um, hard in the present embodiment
Alloy powder granularity is 40um.
The present embodiment strictly controls the addition of B element and Si elements, it is therefore an objective to has both ensured that hard alloy has necessarily oneself
Fusibleness and deoxidation, slaggability, and energy " wetting " substrate surface, avoid boron in cladding process from floating, increase cladding layer again
Crack sensitivity；Meanwhile fusing point is reduced, alloy solid, liquid phase temperature range is expanded again, alloy is had in melting process
There is good mobility and be in excellent metallurgical binding to the good wetability of substrate surface.
Cr elements play a part of solution strengthening, passivation, improve high temperature oxidation resistance and corrosion resisting property, Cr elements more than needed
The carbide such as Cr of chromium is easily formed with C, B element7C3、Cr3C2、, chromium boride hard phase, so as to improve alloy rigidity and wear-resisting
Property.
Embodiment 3
The material that hobboing cutter cutter hub and upper and lower covers are generally selected is national standard 42CrMo, material is through forging, normalizing, after roughing by
Technology for Heating Processing progress modifier treatment, wherein upper and lower covers generic specifications HB250-280, cutter hub technical requirements HRC40-45,
This technical requirements allows for the needs of the processing characteristics of material, mechanical performance and use intensity.The complexity of strata condition
The changeable requirement to cutter is very high, outside hobboing cutter in operation process serious wear, therefore, further improve hobboing cutter external force
Service life could be improved by learning performance.
In order to ensure the rational maintenance of cutter, to the material of above-mentioned cutter appearance part in normal quenched or Quenching Treatment meter
Local laser coated cemented carbide is carried out after drawing technique, to improve hobboing cutter surface hardening layer hardness, improves hobboing cutter surface abrasion resistance
And high-temperature oxidation resistance.
A kind of hard alloy used by the present embodiment, each composition is as follows in percentage by weight：Cr：25；W：12；C：
2；Ni：22；Fe：1；Si：1；B：1；Re：1.5；Surplus is Co, and the hard alloy is powdered and powder size is 40um.
A kind of local laser coated cemented carbide technique of the present embodiment, laser is carried out using above-mentioned hard alloy and melted
Cover, processing step is：
Step 1：Matrix material the pre-heat treatment, by matrix material be heated to 460 DEG C insulation 2 hours after air cooling, then again
Be heated to 180 DEG C insulation 4 hours after air cooling；
Step 2：Laser Cladding Treatment, utilize the laser beam melts claim 1 or claim 2 of coating produced by laser cladding equipment
Described hard alloy, by the way of synchronous powder feeding system, i.e., while laser emission acts on substrate material surface, by alloy
Powder is sent directly into laser action area, keeps feed is synchronous with cladding to carry out, spot diameter 6mm, power 4KW, laser are swept
It is 5mm/s to retouch speed, and the cladding layer thickness that substrate material surface is formed is 1mm；
Step 3：Cladding layer is heat-treated, and the alloy-layer of substrate material surface cladding is heated into 280 DEG C, is incubated 3.5 hours
Air cooling afterwards；
Step 4：Sanding and polishing, the alloy-layer of substrate material surface cladding is polished, polished.
The hard alloy layer of the present embodiment coating is firmly combined with parent metal, and case hardness reaches HRC72, is had excellent
Wear resistance, improve service life.
With traditional handicraft (such as with oxyacetylene torch carry out bar or powder deposit, gas shield tungsten electrode or argon arc deposit,
Water inlet submerged-arc welding, plasma spray coating etc.) compare, the coat of the present embodiment combined with parent metal it is more firm, with higher
Case hardness, and the time that Laser Cladding Treatment needs is short.
Claims (6)
1. a kind of hard alloy, it is characterised in that each composition is as follows in percentage by weight：Cr：20~27；W：10~14；
C：1.5~2.5；Ni：21~23；Fe：1；Si：0.8~1；B：1；Re：1.5；Surplus is Co, and the hard alloy is powdered
And powder size is 40-200um.
2. hard alloy according to claim 1, it is characterised in that each composition is as follows in percentage by weight：Cr：
25；W：12；C：2；Ni：22；Fe：1；Si：1；B:1；Re：1.5；Surplus is Co.
3. a kind of local laser coated cemented carbide technique, it is characterised in that using described in claim 1 or claim 2
Hard alloy carries out laser melting coating, and processing step is：
Step 1：Matrix material the pre-heat treatment, by matrix material be heated to 460 DEG C insulation 2 hours after air cooling, then heat again
Air cooling after being incubated 4 hours to 180 DEG C；
Step 2：Laser Cladding Treatment, using described in the laser beam melts claim 1 or claim 2 of coating produced by laser cladding equipment
Hard alloy, spot diameter 6mm, power 4KW, laser scanning speed 5mm/s, substrate material surface formed cladding layer
Thickness is 1mm；
Step 3：Cladding layer is heat-treated, and the alloy-layer of substrate material surface cladding is heated into 280 DEG C, empty after being incubated 3.5 hours
It is cold；
Step 4：Sanding and polishing, the alloy-layer of substrate material surface cladding is polished, polished.
4. local laser coated cemented carbide technique according to claim 3, it is characterised in that the step 2 is being protected
Carried out in atmosphere.
5. local laser coated cemented carbide technique according to claim 3, it is characterised in that carried out in the step 2
Cemented carbide powder is previously placed in matrix material first during Laser Cladding Treatment and treats cladding position, is then swept using laser beam
Retouch.
6. local laser coated cemented carbide technique according to claim 3, it is characterised in that carried out in the step 2
During Laser Cladding Treatment while laser emission acts on substrate material surface, cemented carbide powder is sent directly into laser and made
With in area, keeping, feed is synchronous with cladding to be carried out.
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Denomination of invention: A Hard Alloy and Local Laser Coating Hard Alloy Process Granted publication date: 20190625 Pledgee: Foshan Rural Commercial Bank Co.,Ltd. Sanshui Baini Branch Pledgor: Foshan Zhuhao mechanical equipment Co.,Ltd. Registration number: Y2024980016865 |