CN107760956B - 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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- CN107760956B CN107760956B CN201710554556.9A CN201710554556A CN107760956B CN 107760956 B CN107760956 B CN 107760956B CN 201710554556 A CN201710554556 A CN 201710554556A CN 107760956 B CN107760956 B CN 107760956B
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- 239000000956 alloy Substances 0.000 title claims abstract description 57
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005253 cladding Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 27
- 239000004615 ingredient Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 24
- 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
- 238000004321 preservation Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 10
- 239000011159 matrix material Substances 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 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
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005552 hardfacing Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 50
- 239000011651 chromium Substances 0.000 description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229910052796 boron Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000243 solution Substances 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
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 239000012071 phase Substances 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
- 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
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 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
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000155 melt 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process 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
- 238000007667 floating Methods 0.000 description 1
- 238000005242 forging Methods 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 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
- 239000002344 surface layer 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 techniques, belong to metallic hardfacing processing technology field.The hard alloy, each ingredient 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 basis material compatibility are preferable, cladding layer dilution rate is smaller and similar thermal expansion coefficient, after carrying out pretreatment and rear heat treatment process to matrix and cladding layer, it is further reduced temperature gradient, it reduces in cladding layer in thermal stress, and then the generation of Crack prevention and alloy-layer obscission has the characteristics that hardness is high, wear-resisting property is good to solve the problems, such as that the alloy-layer coated in the prior art is unstable in conjunction with parent metal.
Description
Technical field
The invention belongs to metallic hardfacing processing technology fields, more specifically to a kind of hard alloy and part
Coating produced by laser cladding hard alloy process.
Background technique
In underground engineering field, shield construction using more and more extensive.Tunnel digging of the shield construction in hard rock section
Into being widely used.Shield machine in underground engineering is bulky, weight is big, and underground activities space is limited, shield machine knife when 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 easily occurs abrasion when operation and needs replacement 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 factor for influencing shield machine performance, thus shield machine roller cutter
Cutter hub and upper and lower covers need to have very high wear-resisting property.Hobboing cutter cutter hub and upper and lower covers coating wear-resistant alloy layer are to improve the resistance to of hobboing cutter
Grinding the degree of wear of reduced performance hobboing cutter during excavation becomes one of the major technique for improving hobboing cutter cutter wear-resisting property, passes
The coated cemented carbide technique of system be oxyacetylene torch carry out bar or powder deposition, gas shield tungsten electrode or argon arc deposition,
The hard alloy layer of water inlet submerged-arc welding, plasma spray coating etc., process above coating is insecure in conjunction with parent metal, interior thermal stress
Greatly, be easy to produce stomata, be mingled with coating cracking phenomenon, toughness and tenacity is not high, easy chip off-falling in use process, and high temperature,
Wear-resisting property 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, seriously affect cutter head of shield machine using the safe and service life.
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 ingredient 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, it is more not in crackle that when blade cladding, which does not have to preheating,.Have
Higher hardness and good cavitation resistive property, the component of cladding are not required to make after can directly finishing through subsequent heat treatment
With the Technological adaptability of laser treatment is preferable, and operation is simple.The disadvantages are as follows: multielement heterogeneous alloy layer was used,
Temperature gradient is big, and thermal stress is high in cladding layer, and interior tissue is unstable.
Chinese invention patent, publication number: publication date: CN104195546A on December 10th, 2014, discloses laser melting coating
With high rigidity Co-based alloy powder and its preparation process.It the specific technical proposal is: a kind of laser melting coating high rigidity cobalt-based
Alloyed powder, each composition by weight percent concentration are as follows: 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 step are as follows: a, the ingredient for preparing each ingredient,
Melting；B, slag making and deoxidation will be carried out into the ingredient for crossing melting in step a；C, it will manufacture by the ingredient of step b processing into powder
Last shape；D, the powdered ingredient in step c is collected；E, it will be sieved in step d through overcooled powdered ingredient.
By adopting the above technical scheme, it provides one kind to be not susceptible to cracking, oxidation, generate stomata, the good laser melting coating of self-fluxing nature is high
Hardness Co-based alloy powder and its preparation process.The disadvantages are as follows: lacking tough group of rare earth element Re and a small amount of B element
It closes, the dilution rate that excessive energy density will lead to cladding layer increases, and is also easy to produce cladding layer cracking and matrix deformation.
Chinese invention patent, publication number: publication date: CN101705487B on July 4th, 2012, discloses turbine one of restriking
The preparation method of level work blade tip wear-resistant coating sequentially includes the following steps: the infrared scan that (1) utilizes coating produced by laser cladding equipment
Device is scanned blade tip end face edge, makes to scan the program-controlled program writing scan point in track position；(2) starting laser applies
The generating device of laser of coating equipment transmits alloy powder to leaf apex end surface, and molten with laser beam under the conditions of inert gas shielding
Alloy powder.The alloy powder is Co base self-fluxing alloy powder, and ingredient 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；The protective gas is argon gas, is protected
Air pressure when shield is 0.2~0.35MPa.The disadvantages are as follows: the hard phases burn rate such as cladding layer coarse grains, especially WC adds
Greatly, alloy-layer is easy cracking, and toughness and tenacity is insufficient.
Summary of the invention
1, it to solve the problems, such as
For the alloy-layer coated in the prior art, unstable problem, the present invention provide a kind of hard in conjunction with parent metal
Matter alloy and local laser coated cemented carbide technique.It makes the alloy-layer hardness with higher and wear-resisting property of coating,
And the alloy-layer coated is tightly combined with parent metal, and tough combination is without the chip off-falling that cracks.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of hard alloy, which is characterized in that each ingredient 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 ingredient 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, using hard alloy described in claim 1 or claim 2 into
Row laser melting coating, processing step are as follows:
Step 1: basis material the pre-heat treatment, it is air-cooled after basis material is heated to 460 DEG C of heat preservations 2 hours, then again
It is air-cooled after being heated to 180 DEG C of heat preservations 4 hours；
Step 2: Laser Cladding Treatment melts claim 1 or claim 2 using the laser beam of coating produced by laser cladding equipment
The hard alloy, spot diameter 6mm, power 4KW, laser scanning speed 5mm/s, substrate material surface are formed molten
Coating thickness is 1mm；
Step 3: the alloy-layer of substrate material surface cladding is heated to 280 DEG C, keeps the temperature 3.5 hours by cladding layer heat treatment
It is air-cooled afterwards；
Step 4: sanding and polishing is polished to the alloy-layer of substrate material surface cladding, is polished.
Further, the step 2 carries out in protective atmosphere.
Further, it carries out that cemented carbide powder is previously placed in matrix first when Laser Cladding Treatment in the step 2
Material waits for cladding position, is then scanned using laser beam.
Further, substrate material surface is acted in laser emission when carrying out Laser Cladding Treatment in the step 2
Meanwhile cemented carbide powder being sent directly into laser action area, keep feed is synchronous with cladding to carry out.
3, beneficial effect
Compared with the prior art, the invention has the benefit that
(1) hard alloy provided by the invention, reasonable disposition alloying component are closed using this ingredient and the hard of proportion
The cladding layer that gold carries out coating produced by laser cladding acquisition is tightly combined with basis material, and surface fused coating hardness is HRC50-72, thus is had
There is the excellent performance that hardness is high, wear-resisting property is good；
(2) hard alloy provided by the invention, rare earth element help to improve the toughness and tenacity and alloy-layer of alloy-layer
Wearability and self-fluxing nature, and help to purify alloy solution, while the tissue crystal grain of refining alloy layer improves alloy-layer mechanics
Performance eliminates the tramp elements such as H/O/S, reduces oxidation tendency of the alloy under liquid and solid-state, and cladding layer has flawless, nothing
The advantages that stomata, free from admixture；
(3) hard alloy provided by the invention, the alloy powder granularity of configuration are controlled in 40-200um, good flowing properties,
Si and B element have deoxidation, fluxing effect, prevent liquid metal excessively polyoxygenated, cemented carbide material of the invention and matrix material
Material has good compatibility, and dilution rate is small, and cladding layer homogenizes degree height, and the heat of basis material and the cladding layer of formation is swollen
Swollen coefficient similar helps avoid the generation of crackle and falling off for alloy-layer；
(4) local laser coated cemented carbide technique provided by the invention carries out in advance basis material and cladding layer respectively
Heat treatment and rear heat treatment, handling substrate preheating helps to eliminate the stress that processing and fabricating generates, to the base after alloy cladding
Body carries out stress tempering processing, helps to reduce temperature gradient, reduces the inherent thermal stress of cladding layer, and then avoid crackle
It generates；
(5) local laser coated cemented carbide technique provided by the invention, in protective atmosphere, such as inert gas gas
Atmosphere, carrying out Laser Cladding Treatment can effectively prevent the reactions such as oxidation, decarburization from occurring.
Specific embodiment
The present invention is further described below combined with specific embodiments below.
Embodiment 1
A kind of hard alloy, each ingredient 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.
When using Laser Cladding Carbide Hard technique, on the one hand since 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 elements such as Si, B cannot effectively float, most of to become 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 and the larger alloy-layer for leading to coating of matrix coefficient of expansion difference are insecure in conjunction 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 expansion coefficient of alloy coat close to parent metal thermal expansion coefficient, reduces the thermal stress of alloy-layer
With residual stress, guarantee that alloy-layer is tightly combined with basis material, and alloy-layer is not likely to produce crackle.
Carry out micro- metallurgical reaction in laser cladding process in molten bath, it is alloy-layer that the WC of generation, which has the characteristics that with high hardness,
The main material on surface layer, and Co element promotes alloy-layer and the mutual of matrix to melt, and improves bond strength, prevents coating shedding.Swash
In light cladding process, Ni and Cr form intermetallic compound, and release amount of heat, and alloy-layer is promoted to be formed with matrix surface
Micro metallurgic bonding further improves the bond strength of alloy-layer and matrix.Cr element plays the role of solution strengthening, passivation,
High temperature oxidation resistance and corrosion resisting property are improved, Cr element more than needed is easy to form the carbide such as Cr of chromium with C element7C3、Cr3C2、
Hard phase, to improve alloy-layer hardness and wearability, on the other hand, Cr element plays certain work on preventing WC decomposition
With improving the wear-resisting property of alloy-layer.
Alloy melting point can be significantly reduced in Si element and B element, expands solid-liquid phase line humidity province, on the one hand ensure that alloy
There is appropriate mobility in melting, the alloy of fusing is enable uniformly to spread out in substrate surface, forms smooth surface, on the other hand
Deoxidation and reduction effect and slag making function, promote the hardening and reinforcing of alloy coat.
W helps to improve the hardness of alloy-layer, to improve wear-resisting property；Ni helps to increase the intensity of alloy-layer and tough
Property, and make alloy-layer corrosion resistance with higher.
Embodiment 2
A kind of hard alloy, each ingredient 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 addition of the present embodiment strict control B element and Si element, it is therefore an objective to both guarantee that hard alloy had centainly oneself
Fusibleness and deoxidation, slaggability, and energy " wetting " substrate surface, and avoid boron in cladding process that from cannot floating, increase cladding layer
Crack sensitivity；Meanwhile fusing point is reduced, and expand alloy solid, liquid phase temperature range, have alloy in melting process
There is good mobility and to the good wetability of substrate surface and in excellent metallurgical bonding.
Cr element plays the role of solution strengthening, passivation, improves high temperature oxidation resistance and corrosion resisting property, Cr element more than needed
It is easy to form the carbide such as Cr of chromium with C, B element7C3、Cr3C2、, chromium boride hard phase, to improve alloy rigidity and wear-resisting
Property.
Embodiment 3
The material that hobboing cutter cutter hub and upper and lower covers are usually selected is national standard 42CrMo, material through forging, normalizing, press after roughing
Heat treatment process carries out 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 performance of material, mechanical performance and use intensity.The complexity of strata condition
The changeable requirement to cutter is very high, and in operation process therefore serious wear further increases hobboing cutter external force outside hobboing cutter
Learning performance can just improve service life.
In order to guarantee the rational maintenance of cutter, the material of above-mentioned cutter appearance part is counted in normal quenched or quenching treatment
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 ingredient 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.
It is molten to carry out laser using above-mentioned hard alloy for a kind of local laser coated cemented carbide technique of the present embodiment
It covers, processing step are as follows:
Step 1: basis material the pre-heat treatment, it is air-cooled after basis material is heated to 460 DEG C of heat preservations 2 hours, then again
It is air-cooled after being heated to 180 DEG C of heat preservations 4 hours；
Step 2: Laser Cladding Treatment melts claim 1 or claim 2 using the laser beam of coating produced by laser cladding equipment
The 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
Retouching speed is 5mm/s, and the cladding layer that substrate material surface is formed is with a thickness of 1mm；
Step 3: the alloy-layer of substrate material surface cladding is heated to 280 DEG C, keeps the temperature 3.5 hours by cladding layer heat treatment
It is air-cooled afterwards；
Step 4: sanding and polishing is polished to the alloy-layer of substrate material surface cladding, is polished.
The hard alloy layer of the present embodiment coating is firmly combined with parent metal, and surface hardness reaches HRC72, is had excellent
Wear resistance, improve service life.
With traditional handicraft (such as with oxyacetylene torch carry out bar or powder deposition, gas shield tungsten electrode or argon arc deposition,
Water inlet submerged-arc welding, plasma spray coating etc.) it compares, the coat of the present embodiment is stronger in conjunction with parent metal, has higher
Surface hardness, and the time that Laser Cladding Treatment needs is short.
Claims (3)
1. a kind of local laser coated cemented carbide technique, which is characterized in that laser melting coating is carried out using hard alloy, it is described hard
Each ingredient is as follows in percentage by weight for matter alloy: 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, technique
Step are as follows: step 1: basis material the pre-heat treatment, it is air-cooled after basis material is heated to 460 DEG C of heat preservations 2 hours, then again
It is air-cooled after being heated to 180 DEG C of heat preservations 4 hours；Step 2: Laser Cladding Treatment, using in the laser beam fusing of coating produced by laser cladding equipment
The hard alloy stated, spot diameter 6mm, power 4KW, laser scanning speed 5mm/s, the cladding that substrate material surface is formed
With a thickness of 1mm, the step 2 carries out layer in protective atmosphere；Step 3: cladding layer heat treatment, by substrate material surface cladding
Alloy-layer be heated to 280 DEG C, it is air-cooled after heat preservation 3.5 hours；Step 4: sanding and polishing, the conjunction to substrate material surface cladding
Layer gold is polished, is polished.
2. local laser coated cemented carbide technique according to claim 1, which is characterized in that carried out in the step 2
Cemented carbide powder is previously placed in basis material first when Laser Cladding Treatment and waits for cladding position, is then swept using laser beam
It retouches.
3. local laser coated cemented carbide technique according to claim 1, which is characterized in that carried out in the step 2
When Laser Cladding Treatment while laser emission acts on substrate material surface, cemented carbide powder is sent directly into laser and is made
With keeping in area, 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 |