CN109402625A - A kind of structural alloy steel laser deposition hole removing method - Google Patents

A kind of structural alloy steel laser deposition hole removing method Download PDF

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CN109402625A
CN109402625A CN201710707343.5A CN201710707343A CN109402625A CN 109402625 A CN109402625 A CN 109402625A CN 201710707343 A CN201710707343 A CN 201710707343A CN 109402625 A CN109402625 A CN 109402625A
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steel
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deposition
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CN109402625B (en
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迟长泰
谢玉江
彭晓
董志宏
亢红伟
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Institute of Metal Research of CAS
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    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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    • 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
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
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    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/25—Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS]
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/32—Process control of the atmosphere, e.g. composition or pressure in a building chamber
    • B22F10/322—Process control of the atmosphere, e.g. composition or pressure in a building chamber of the gas flow, e.g. rate or direction
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/34—Process control of powder characteristics, e.g. density, oxidation or flowability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
    • 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
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/40—Radiation means
    • B22F12/41—Radiation means characterised by the type, e.g. laser or electron beam
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Abstract

The invention belongs to metal laser material increasing fields, are related to a kind of low-carbon alloy structural steel laser deposition hole removing method, the elimination of the alloy steel member laser deposition hole defect suitable for various labyrinths.Using Ni, Cr, Nb one or more powder with alloy steel powder same particle sizes; certain proportion is uniformly mixed by ball mill in alloy steel powder; laser deposition is carried out with synchronous powder feeding system method in vacuum glove box; with the argon gas of certain flow protection laser deposition active region, it can be achieved that the imperforate laser gain material of structural steel interior tissue manufactures in deposition process.The present invention provides novel technological method for the elimination of structural steel powder laser deposition hole, change structure powdered steel in smaller situation in chemical component, deposition fabric dense uniform, and hole defect completely eliminates, the mechanical property of sedimentary significantly improves, and the solution of deposition fabric structure and mechanical property optimization is provided in terms of manufacturing steel construction piece for laser gain material.

Description

A kind of structural alloy steel laser deposition hole removing method
Technical field
The invention belongs to metal laser material increasing fields, are related to a kind of low-carbon alloy structural steel laser deposition hole elimination Method, the elimination of the alloy steel member laser deposition hole defect suitable for various labyrinths.
Background technique
Low-carbon alloy structural steel is as the widely used metal material of modern industry, with good harden ability, through suitable After suitable heat treatment, easily reach the mechanical property etc. of good behaviour, is widely used in that manufacture interface dimensions are larger, complicated machine Device part.Such as: large scale high-performance in the key projects such as nuclear power Emergency diesel camshaft and brake disc of high-speed train field Constitutional detail.Alloy structure steel part applications in various fields potentiality, it is equal to depend primarily on large-size components dense internal organization Even, each section performance is uniformly coordinated.
So far, the coarse scale structures steel part of complicated shape is mainly derived from casting, but the yield rate of domestic casting About 30%, easily there is radiating ribs casting crack, and the service life of finished product is lower, hardly possible meets the industries such as fast-developing nuclear power and high-speed rail It is required that serious limit structural steel part is widely applied in China's industrial circle, and coarse scale structures steel part is (such as: nuclear power Camshaft and high-speed rail brake disc) import is mainly used, part value is higher.
Laser gain material manufacturing technology, also referred to as laser be melted and molded technology (Laser Melt Deposition, LMD) be with High power or high brightness laser are heat source, by the raw material of laser fusion synchronous transport, successively accumulate and realize increasing material manufacturing, Energy input, material composition etc. can be accurately controlled, realizes the molding manufacture of arbitrarily complicated shaped metal part.Laser gain material system The technology of making is able to achieve precisely three-dimensional cladding, and has high efficiency, low cost, high-quality manufacturing complicated high performance structures steel The peculiar advantage such as amount and high-performance.Therefore, alloy steel parts laser melting deposition manufacturing method is studied, to breaking foreign technology ridge It is disconnected, it is that new product development, improving performance and China's key components and parts manufacture autonomy-oriented with important practical value and theory significance.
Summary of the invention
In order to solve the defect problem of deposition hole in the manufacture of large scale high performance structures steel part laser gain material, the present invention Be designed to provide a kind of structural alloy steel laser deposition hole removing method, utilize mixed active powder inhibit hole production It is raw, realize steel alloy laser deposition without hole tissue and excellent mechanical performances.
Technical scheme is as follows:
A kind of structural alloy steel laser deposition hole removing method, the processing step of this method are as follows:
Using the identical structural steel of granularity and Ni, Cr, Nb powder, Ni, Cr, Nb one or more powder are taken respectively Ball milling is mixed into structure powdered steel in proportion, and mixed powder is dried, and being dried temperature is 50 It~120 DEG C, after drying, is cooled to room temperature；Matrix is selected according to the target powdered steel of deposition, in vacuum glove box environment In, using synchronous powder feeding system depositional mode, a kind of light beam of hot spot is selected to carry out laser deposition processing on matrix, while with protection Gas covers laser action area, and the field trash for reducing laser action area generates and improves solidification rate.
The structure powdered steel, granularity is in 100~250 mesh, sphericity >=90%, oxygen content >=500PPM.
Ni, Cr, Nb powder, granularity are 100~250 mesh, and sphericity >=90%, chemical component purity is in 99wt% More than, oxygen content≤500PPM.
The ratio is that Ni, Cr, Nb one or more powder account for mixing comminuted steel shot ratio no more than 5wt%, mixing Comminuted steel shot total weight 100%.
The drying process is to be placed in mixed-powder in drying box 1 hour or more.
The matrix is that have preferable wetability and good welds performance with structural steel.
The vacuum glove box environment, H2O≤100PPM、O2≤100PPM。
The technological parameter of the laser deposition is as follows:
Laser continuous irradiation, laser power are 500~2000W, power density 104~106W/cm2, scanning speed be 4~ 16mm/s, amount of lap are 30%~70%, irradiate hot spot Φ 2mm~Φ 5mm；
Automatic powder feeding system is coaxial argon gas powder feeding, and powder feed rate is 5~20g/min, using inert gas argon gas shielded, protection Throughput is 10~20L/min.
The laser of the laser deposition is optical fiber laser, semiconductor laser or CO2Laser.
The alloy structure powdered steel of this method processing, even tissue is fine and close after laser deposition, and hole, crackle and field trash lack It falls into and completely eliminates, while depositing hardness and reaching HV350~HV450.
The invention has the advantages and beneficial effects that:
1, a kind of structural alloy steel laser deposition hole removing method provided by the invention, makes low-carbon alloy structural steel powder The elimination of laser deposition hole defect is possibly realized, and in structure powdered steel in the case where chemical component changes smaller situation, realizes that laser is heavy Product dense structure is uniform, and hole defect completely eliminates, and saves the cost of production, mentions in terms of manufacturing steel construction piece for laser gain material For the new solution of one kind of deposition fabric structure optimization.
2, it using laser deposition of the present invention on the basis of fully ensuring that the microstructure and mechanical property that steel alloy itself has, sinks The mechanical property of lamination significantly improves, to advanced optimize microstructure and mechanical property.
3, the present invention solves the poor defect of alloy steel powder self-fluxing nature, improves the utilization of alloy steel powder laser deposition Rate.
4, present invention process is mixed into using the powder of different proportion, and the mechanical property of different hardness and stretching may be implemented Deposition.
Detailed description of the invention
Fig. 1 (a)-(b) is 1 laser deposition alloy steel powder heterogeneous microstructure of embodiment；
Fig. 2 (a)-(b) is the steel alloy heterogeneous microstructure of 1 laser deposition mixing 4wt%Cr powder of embodiment；
Fig. 3 is the hardness distribution of laser deposition steel alloy and hybrid alloys powdered steel.
Specific embodiment
In the specific implementation process, the present invention uses the identical structural steel of granularity and several powder of Ni, Cr, Nb, respectively Taking Ni, Cr, Nb one or more powder, ball milling is mixed into structure powdered steel according to a certain percentage, and will be mixed Powder is dried, and being dried temperature is 50~120 DEG C, after drying process, is cooled to room temperature；According to deposition Object construction powdered steel selects suitable matrix, using synchronous powder feeding system depositional mode, to select one kind in vacuum glove box environment The light beam of hot spot carries out laser deposition processing on matrix, while covering laser action area with protective gas, reduces laser action The field trash in area generates and improves solidification rate.
Hereinafter, preferred embodiments of the present invention will be described, it should be understood that preferred embodiment described herein is only used In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment 1
In the present embodiment, structural alloy steel laser deposition hole removing method, the specific steps are as follows:
1, structural alloy steel powder size is in 100~250 mesh, sphericity >=93%, oxygen content >=500PPM；Ni,Cr,Nb Several powder sizes be 100~250 mesh, sphericity >=94%, chemical component purity be 99.99wt% or more, oxygen content≤ 500PPM.Wherein, the alloy designations of alloy structure powdered steel are 12CrNi2.
2, it takes a kind of powder of pure Cr to be mixed into alloy steel powder in 4wt% ratio, calculates by weight percentage, Cr powder accounts for whole A hybrid alloys powdered steel ratio is 4%.
3, mixed-powder is dried: 100 DEG C × 1.5h of temperature.
4, depositing base: 12CrNi2 structural alloy steel.
5, laser deposition vacuum glove box environment: H2O、O2≤50PPM。
6, the technological parameter of laser deposition: laser continuous irradiation, laser power 900W, power density 105W/cm2, scanning Speed is 6mm/s, and amount of lap 50% irradiates hot spot Φ 2mm；Laser coaxial argon gas powder feeding, powder feed rate 8g/min, using argon Gas shielded, protection air-flow amount are 15L/min.
7, laser: the semiconductor laser of 3000W.
As shown in Fig. 1 (a)-(b), find out from laser deposition prototype structure powdered steel institutional framework, deposition fabric exist compared with Multiple hole, crackle and inclusion defects.
As shown in Fig. 2 (a)-(b), by the structure powdered steel of above method processing, even tissue is fine and close after laser deposition, The defects of deposition hole, crackle and field trash, completely eliminates.
As shown in figure 3, from the distribution of the hardness of laser deposition steel alloy and hybrid alloys powdered steel as can be seen that mixed-powder Laser deposition hardness can reach HV400.
Embodiment 2
In the present embodiment, structural alloy steel laser deposition hole removing method, the specific steps are as follows:
1, structural alloy steel powder size is in 100~250 mesh, sphericity >=93%, oxygen content >=500PPM；Ni,Cr,Nb Several powder sizes be 100~250 mesh, sphericity >=94%, chemical component purity be 99.99wt% or more, oxygen content≤ 500PPM.Wherein, the alloy designations of alloy structure powdered steel are 12CrNi2.
2, it takes two kinds of powder of pure Ni, Cr to be mixed into alloy steel powder in 1wt% ratio respectively, calculates by weight percentage, Ni, It is 2% that Cr powder, which accounts for entire hybrid alloys powdered steel ratio,.
3, mixed-powder is dried: 80 DEG C × 3.0h of temperature.
4, depositing base: 12CrNi2 structural alloy steel.
5, laser deposition vacuum glove box environment: H2O、O2≤50PPM。
6, the technological parameter of laser deposition: laser continuous irradiation, laser power 1200W, power density 2 × 105W/cm2, Scanning speed is 10mm/s, and amount of lap 40% irradiates hot spot Φ 3mm；Laser coaxial argon gas powder feeding, powder feed rate 12g/min, It is protected using argon gas, protection air-flow amount is 12L/min.
7, laser: the optical fiber laser of 3000W.
In the present embodiment, by the structure powdered steel of above method processing, even tissue is fine and close after laser deposition, deposition hole Hole defect completely eliminates.It is distributed from the hardness of laser deposition steel alloy and hybrid alloys powdered steel as can be seen that deposition hardness can Reach HV450.
Embodiment 3
In the present embodiment, structural alloy steel laser deposition hole removing method, the specific steps are as follows:
1, structural alloy steel powder size is in 100~250 mesh, sphericity >=93%, oxygen content >=500PPM；Ni,Cr,Nb Several powder sizes be 100~250 mesh, sphericity >=94%, chemical component purity be 99.99wt% or more, oxygen content≤ 500PPM.Wherein, the alloy designations of alloy structure powdered steel are 12CrNi2.
2, it takes tri- kinds of powder of pure Ni, Cr, Nb to be mixed into alloy steel powder in 1wt% ratio respectively, calculates by weight percentage, It is 3% that Cr powder, which accounts for entire hybrid alloys powdered steel ratio,.
3, mixed-powder is dried: 120 DEG C × 2.0h of temperature.
4, depositing base: 12CrNi2 structural alloy steel.
5, laser deposition vacuum glove box environment: H2O、O2≤50PPM。
6, the technological parameter of laser deposition: laser continuous irradiation, laser power 1500W, power density 3 × 105W/cm2, Scanning speed is 12mm/s, and amount of lap 60% irradiates hot spot Φ 4mm；Laser coaxial argon gas powder feeding, powder feed rate 16g/min, It is protected using argon gas, protection air-flow amount is 18L/min.
7, laser: the CO of 3000W2Laser.
In the present embodiment, by the structure powdered steel of above method processing, even tissue is fine and close after laser deposition, deposition hole Hole defect completely eliminates.It is distributed from the hardness of laser deposition steel alloy and hybrid alloys powdered steel as can be seen that deposition hardness can Reach HV420.
Embodiment the result shows that, the present invention uses and Ni, Cr, Nb of alloy steel powder same particle sizes are one or more kinds of Powder uniformly mixes certain proportion by ball mill in alloy steel powder, in vacuum glove box with synchronous powder feeding system method into Row laser deposition, with the argon gas protection laser deposition active region of certain flow, it can be achieved that structural steel interior tissue in deposition process Imperforate laser gain material manufacture.The present invention provides novel technological method for the elimination of structural steel powder laser deposition hole, makes Structure powdered steel is in the case where chemical component changes smaller situation, and laser deposition dense structure is uniform, and deposition hole defect disappears completely It removes, the mechanical property of sedimentary significantly improves, and provides deposition fabric structure and mechanics in terms of manufacturing steel construction piece for laser gain material The solution of performance optimization.
Finally it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention, It, for those skilled in the art, still can be with although the present invention will be described in detail with reference to the foregoing embodiments It modifies the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.It is all Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in guarantor of the invention Within the scope of shield.

Claims (10)

1. a kind of structural alloy steel laser deposition hole removing method, which is characterized in that the processing step of this method is as follows:
Using the identical structural steel of granularity and Ni, Cr, Nb powder, take respectively Ni, Cr, Nb one or more powder by than Example ball milling is mixed into structure powdered steel, and mixed powder is dried, and being dried temperature is 50~120 DEG C, after drying, it is cooled to room temperature；Matrix is selected according to the target powdered steel of deposition, in vacuum glove box environment, is used Synchronous powder feeding system depositional mode selects a kind of light beam of hot spot to carry out laser deposition processing on matrix, while being covered with protective gas Lid laser action area, the field trash for reducing laser action area generate and improve solidification rate.
2. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that the structure Powdered steel, granularity is in 100~250 mesh, sphericity >=90%, oxygen content >=500PPM.
3. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that the Ni, Cr, Nb powder, granularity are 100~250 mesh, sphericity >=90%, chemical component purity in 99wt% or more, oxygen content≤ 500PPM。
4. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that the ratio It is that Ni, Cr, Nb one or more powder account for mixing comminuted steel shot ratio no more than 5wt%, mixes comminuted steel shot total weight 100%.
5. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that the drying Processing is to be placed in mixed-powder in drying box 1 hour or more.
6. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that the matrix It is that there is preferable wetability and good welds performance with structural steel.
7. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that the vacuum Glove box environment, H2O≤100PPM、O2≤100PPM。
8. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that the laser The technological parameter of deposition is as follows:
Laser continuous irradiation, laser power are 500~2000W, power density 104~106W/cm2, scanning speed is 4~16mm/ S, amount of lap are 30%~70%, irradiate hot spot Φ 2mm~Φ 5mm；
Automatic powder feeding system is coaxial argon gas powder feeding, and powder feed rate is 5~20g/min, using inert gas argon gas shielded, protection air-flow Amount is 10~20L/min.
9. structural alloy steel laser deposition hole removing method according to claim 1 or 8, which is characterized in that described The laser of laser deposition is optical fiber laser, semiconductor laser or CO2Laser.
10. structural alloy steel laser deposition hole removing method according to claim 1, which is characterized in that at this method The alloy structure powdered steel of reason, even tissue is fine and close after laser deposition, and hole, crackle and inclusion defects completely eliminate, simultaneously Deposition hardness reaches HV350~HV450.
CN201710707343.5A 2017-08-17 2017-08-17 Method for eliminating laser deposition holes of alloy structural steel Active CN109402625B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110303163A (en) * 2019-05-23 2019-10-08 中国人民解放军第五七一九工厂 A kind of high-strength high cracking resistance laser gain material reparation composite powder and preparation method
CN110788323A (en) * 2019-12-02 2020-02-14 浙江翰德圣智能再制造技术有限公司 Method for improving wear resistance and impact resistance of alloy steel component manufactured by laser additive
CN113681012A (en) * 2021-08-24 2021-11-23 江苏拜欧尼克智能科技有限公司 Method for repairing hole defects of cast cylinder block by laser

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CN105478768A (en) * 2016-01-06 2016-04-13 福建工程学院 3D printing die laser cladding equipment and gradation process
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CN105886923A (en) * 2016-07-01 2016-08-24 西安铂力特激光成形技术有限公司 High-temperature wear-resisting and corrosion-resisting steel powder for additive manufacturing and additive manufacturing method
CN106399863A (en) * 2016-12-03 2017-02-15 东北大学 24CrNiMoRe alloy steel powder of laser additives and production method thereof

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Publication number Priority date Publication date Assignee Title
CN103056355A (en) * 2013-01-29 2013-04-24 大连海事大学 Manufacturing and application methods for laser cladding powder of iron-base alloy
CN105624470A (en) * 2015-12-09 2016-06-01 机械科学研究总院先进制造技术研究中心 Iron-nickel-based composite alloy powder for laser cladding and laser cladding method of powder
CN105478768A (en) * 2016-01-06 2016-04-13 福建工程学院 3D printing die laser cladding equipment and gradation process
CN105886923A (en) * 2016-07-01 2016-08-24 西安铂力特激光成形技术有限公司 High-temperature wear-resisting and corrosion-resisting steel powder for additive manufacturing and additive manufacturing method
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110303163A (en) * 2019-05-23 2019-10-08 中国人民解放军第五七一九工厂 A kind of high-strength high cracking resistance laser gain material reparation composite powder and preparation method
CN110303163B (en) * 2019-05-23 2022-03-11 中国人民解放军第五七一九工厂 High-strength and high-crack-resistance composite powder for laser additive repair and preparation method thereof
CN110788323A (en) * 2019-12-02 2020-02-14 浙江翰德圣智能再制造技术有限公司 Method for improving wear resistance and impact resistance of alloy steel component manufactured by laser additive
CN110788323B (en) * 2019-12-02 2022-04-22 浙江翰德圣智能再制造技术有限公司 Method for improving wear resistance and impact resistance of alloy steel component manufactured by laser additive
CN113681012A (en) * 2021-08-24 2021-11-23 江苏拜欧尼克智能科技有限公司 Method for repairing hole defects of cast cylinder block by laser

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