CN107937911A - A kind of cast steel surface laser cladding wear impact-resistant coating method - Google Patents

A kind of cast steel surface laser cladding wear impact-resistant coating method Download PDF

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CN107937911A
CN107937911A CN201810006318.9A CN201810006318A CN107937911A CN 107937911 A CN107937911 A CN 107937911A CN 201810006318 A CN201810006318 A CN 201810006318A CN 107937911 A CN107937911 A CN 107937911A
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cast steel
laser
metal alloy
steel surface
laser cladding
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CN107937911B (en
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石岩
李云峰
刘佳
陈奎明
倪聪
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Changchun University of Science and Technology
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Changchun University of Science and Technology
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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
    • 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
    • C23C24/106—Coating with metal alloys or metal elements only
    • 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
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
    • 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
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer

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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)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a kind of cast steel surface laser cladding wear impact-resistant coating method, cladding metal dust is dried 90~120min by (1), and drying temperature is 80~90 DEG C；(2) cast steel surface to be treated is subjected to frosting treatment with sand paper polishing, it is stand-by then to clean greasy dirt with acetone；(3) 400~500 DEG C of pre-add heat treatment (4) is carried out to cast steel laser consolidation treatment is carried out to the cast steel surface after the pre-heat treatment；(5) after treating laser consolidation treatment, coaxial powder-feeding laser melting coating metal alloy prime coat is carried out on established laser melting layer；(6) coaxial powder-feeding laser melting coating metal alloy wear and shock-resistant layer is carried out again on established metal alloy prime coat.

Description

A kind of cast steel surface laser cladding wear impact-resistant coating method
Technical field
The invention belongs to field of laser processing, is related to a kind of cast steel surface laser cladding wear impact-resistant coating method.
Background technology
Cast steel is the general name for being used to produce the ferrous alloy of casting that eutectic transformation is not suffered from process of setting, wherein carbon Element is essential element, and content is between 0~2%.According to the difference of the carbon content in cast steel, cast steel can be divided into：Low-carbon Steel, medium carbon steel and high-carbon steel；According to the difference of the alloying element content in cast steel, cast steel can be divided into：Cast low alloy steel, Cast medium alloy steel and casting high-alloy steel.In addition to above species, casting special steel, such as cast stainless steel, casting are further included Abrasion-resistant stee and casting heat-resistant steel etc..At present, cast steel material is widely used in mechanical processing, automobile, ship because of its excellent performance The heavy industry such as oceangoing ship and petrochemical industry field.But in the working environment in above field, the cast steel components that use for a long time easily by To different degrees of impact and wear-out failure, service life drastically shortens, so as to produce a large amount of energy consumptions, pollution and resource wave Take.
To improve steel-casting wear-resisting property, intensive treatment is carried out to steel-casting working surface.At present, normal quenching and sensing Quench and also use laser-quenching technique strengthened steel cast part working surface performance for main surface treatment method, part researcher.But Since quenching technical can not change the essential performance of basis material, cause wear-resisting property lifting limited.Using laser melting and coating technique Prepare metal alloy coating in steel casting surface and can realize and cover high performance material on original material surface, so as to greatly improve The wear-resisting property of steel-casting.However, due to cast steel in casting process there may be increased number of stomata and slag inclusion, in laser cladding process In a large amount of defects can be produced in metal alloy coating, make coating and cast steel base material be difficult to form good metallurgical binding, reduce The wear and shock-resistant performance of coating.
The content of the invention
The technology of the present invention solves the problems, such as：In order to solve cast steel material in laser cladding process due to existing for cast steel substrate The problem of stomata and dreg defect and the quality of cladding layer that brings decline, there is provided a kind of steel surface laser cladding wear impact resistance applies Layer method, realizes the preparation of pore-free and slag inclusion high abrasion impact resistance coating.
The technology of the present invention solution：A kind of cast steel surface laser cladding wear impact-resistant coating method, including following step Suddenly：
Step 1: metal alloy powders are weighed and are dried in vacuo, treat that post laser cladding uses；
Step 2: cast steel surface is carried out frosting treatment with sand paper polishing, it is stand-by then to clean greasy dirt with acetone；
Step 3: carrying out the pre-heat treatment to the cast steel for removing degreasing and corrosion, prepare for laser consolidation treatment；
Step 4: carrying out high power laser light remelting to the cast steel surface after the pre-heat treatment, laser melting layer is formed, is disappeared The defects of except cast steel surface and hole；
Step 5: carrying out Laser Cladding Treatment in the laser melting layer surface that cast steel is formed, argon gas is melted as protection gas Whiting end uses good toughness, the strong metal alloy powders of wetting and spreading, and metal alloy powders pass through coaxial powder-feeding method and profit Cast steel laser melting layer surface is blown into by the use of argon gas as powder gas is carried, the laser melting coating metal on established laser melting layer Alloy prime coat, it makes composite coating and cast steel surface mainly as cast steel and the articulamentum of metal alloy wear and shock-resistant layer Form the good combination of pore-free crackle；
Step 6: carrying out Laser Cladding Treatment in the metal alloy bottoming layer surface that cast steel is formed, argon gas is as protection Gas, cladding powder using wear and shock-resistant metal alloy powders of good performance by coaxial powder-feeding method and by the use of argon gas as Carry powder gas and be blown into cast steel metal alloy bottoming layer surface, laser melting coating metal closes on established metal alloy prime coat Golden wear and shock-resistant layer.
Further, the step 1 further comprises：By the powder after weighing in 80~90 DEG C of vacuum drying chamber Dry 90~120min.
Further, the step 3 further comprises：
400~500 DEG C of pre-add is carried out to cast steel to be heat-treated；
Further, the step 4 further comprises：
Consolidation 0.3~the 0.5mm of layer depth formed, the uniform zero defect of consolidation layer, flawless；
Further, the step 5 further comprises：
The metal alloy bottoming layer thickness formed is 0.3~0.5mm；
Further, the step 5 further comprises：
The chemical composition (each element mass percent) of metal alloy powders is used by prime coat：C:0.02%~ 0.03%th, Si:0.1%~0.14%, Mn:0.4%~0.46%, Cr:15.5%~16.5%, Co:2.0%~2.8%Mo: 15.5%~16.5%, W:3.8%~4.6%, Nb:0.31%~0.37%, Fe:0.7%~0.8%, Ni:Surplus；
Further, the step 6 further comprises：
The metal alloy wear and shock-resistant layer thickness formed is 0.8~1.0mm；
Further, the step 6 further comprises：
The chemical composition (each element mass percent) of metal alloy powders is used by wear and shock-resistant layer：C: 0.30%~0.34%, Si:3.5%~4.3%, Cr:10.5%~11.5%, B:2.0%~2.6%, Fe:10.0%~ 11.0%th, Ni:Surplus；
Further, in step 4,2000~3500W of laser power, 200~350mm/min of sweep speed, spot diameter 4 ~6mm；
Further, in step 5,1500~2500W of laser power, 200~350mm/min of sweep speed, powder feeding rate 3 ~5g/min, 2~4mm of spot diameter, 6~10l/min of protection air-flow amount；
Further, in step 6,1800~2600W of laser power, 250~400mm/min of sweep speed, powder feeding rate 5 ~8g/min, 2~4mm of spot diameter, wherein 8~15l/min of protection air-flow amount.
The present invention compared with prior art the advantages of be：
(1) during laser melting, steel-casting top layer can be melted and solidified again by laser, in the process cast steel Blow hole existing for top layer the defects of slag inclusion with that can be eliminated, so as to effectively reduce laser melting coating metal alloy coating and matrix The defects of land, make to form good metallurgical binding between cast steel substrate and metal alloy prime coat；
(2) the metal alloy prime coat that laser melting coating is formed is mainly by good toughness, the strong metal alloy powder of wetting and spreading End is made, it is cast steel and the articulamentum of metal alloy wear and shock-resistant layer, since metal alloy prime coat has well tough Property and wetability, between cast steel and metal alloy prime coat formed pore-free crackle metallurgical binding area, it was demonstrated that cast steel base material And metal alloy prime coat has good combination effect.
(3) the metal alloy wear and shock-resistant layer that laser melting coating is formed mainly is closed by the metal with wear and shock-resistant performance Bronze end is made, and because of the good anti-attrition of alloy powder and wear and shock-resistant attribute, related experiment proves formed metal alloy Layer has preferable Wear-resistant and impact resistance.
Brief description of the drawings
Fig. 1 is the method for the present invention process flow chart；
Fig. 2 is 42CrMo cast steel surface laser cladding wear impact-resistant coating metallographs in embodiment 1；
Fig. 3 is the wear rate comparison diagram under the conditions of 42CrMo cast steel different surface treatment modes in embodiment 1；
Fig. 4 is the friction coefficient comparison diagram under the conditions of 42CrMo cast steel different surface treatment modes in embodiment 1；
Fig. 5 is the average impact work(comparison diagram under the conditions of 42CrMo cast steel different surface treatment modes in embodiment 1；
Fig. 6 be embodiment 1 in 42CrMo cast steel laser cladding wear impact-resistant coatings in room temperature with 500 DEG C of high temperings Microhardness curve map afterwards.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is discussed in detail in specific embodiment.But following embodiment is only limitted to explain this hair Bright, protection scope of the present invention should include the full content of claim, be not limited only to the present embodiment.
A kind of as shown in Figure 1, specific implementation step of cast steel surface laser cladding wear impact-resistant coating method of the present invention It is as follows：
Step 1: after metal alloy powders are weighed dry 90 in 80~90 DEG C of vacuum drying chamber~ 120min；
Step 2: cast steel components surface to be treated is carried out frosting treatment with sand paper polishing, then greasy dirt is cleaned with acetone It is stand-by；
It is at laser melting Step 3: carrying out 400~500 DEG C of the pre-heat treatments to the cast steel for removing degreasing and corrosion Reason is prepared；
Step 4: carrying out high power laser light remelting to the cast steel surface after the pre-heat treatment, laser melting layer is formed, is disappeared The defects of except cast steel surface and hole；
Institute the technological parameter that uses for：2000~3500W of laser power, 200~350mm/min of sweep speed, spot diameter 4 ~6mm, the consolidation 0.3~0.5mm of layer depth formed, the uniform zero defect of consolidation layer, flawless；
Step 5: carrying out Laser Cladding Treatment in the laser melting layer surface that cast steel is formed, argon gas is melted as protection gas Whiting end uses good toughness, the strong metal alloy powders of wetting and spreading, and powder is made by coaxial powder-feeding method and using argon gas Cast steel laser melting layer surface is blown into carry powder gas, the laser melting coating metal alloy bottoming on established laser melting layer Layer, it makes composite coating be formed with cast steel surface without gas mainly as cast steel and the articulamentum of metal alloy wear and shock-resistant layer The good combination of porous dehiscence line；
Institute the technological parameter that uses for：Laser cladding technological parameter is：1500~2500W of laser power, sweep speed 200~ 350mm/min, 3~5g/min of powder feeding rate, 2~4mm of spot diameter, protection air-flow 6~10l/min of amount, the metal formed Alloy bottoming layer thickness is 0.3~0.5mm；Chemical composition (each element quality hundred of metal alloy powders used by prime coat Divide ratio) be：C:0.02%~0.03%, Si:0.1%~0.14%, Mn:0.4%~0.46%, Cr:15.5%~16.5%, Co:2.0%~2.8%, Mo:15.5%~16.5%, W:3.8%~4.6%, Nb:0.31%~0.37%, Fe:0.7%~ 0.8%th, Ni:Surplus；
Step 6: carrying out Laser Cladding Treatment in the metal alloy bottoming layer surface that cast steel is formed, argon gas is as protection Gas, cladding powder use wear and shock-resistant metal alloy powders of good performance, and powder is by coaxial powder-feeding method and utilizes argon Gas is blown into cast steel metal alloy bottoming layer surface as powder gas is carried, the laser melting coating on established metal alloy prime coat Metal alloy wear and shock-resistant layer.
Institute the technological parameter that uses for：Laser cladding technological parameter is：1800~2600W of laser power, sweep speed 250~ 400mm/min, 5~8g/min of powder feeding rate, 2~4mm of spot diameter, protection air-flow 8~15l/min of amount, the metal formed Alloy wear-resisting shock-resistant layer thickness is 0.8~1.0mm；
The chemical composition (each element mass percent) of metal alloy powders is used by wear and shock-resistant layer：C: 0.30%~0.34%, Si:3.5%~4.3%, Cr:10.5%~11.5%, B:2.0%~2.6%, Fe:10.0%~ 11.0%th, Ni:Surplus；
Embodiment 1
The present embodiment is using cast steel ZG 42CrMo as matrix, and bottoming layer material is Co-based alloy powder, chemical composition (each member Plain mass percent) be：C:0.02%th, Si:0.1%th, Mn:0.4%th, Cr:15.5%th, Co:2.0%th, Mo:15.5%th, W: 3.8%th, Nb:0.31%th, Fe:0.7%th, Ni:Surplus；Wear and shock-resistant layer material is iron(-)base powder, chemical composition (each member Plain mass percent) be：C:0.30%th, Si:3.5%th, Cr:10.5%th, B:2.0%th, Fe:10.0%th, Ni:Surplus；
Specific implementation step is as follows：
(1) it is dry in 80 DEG C of vacuum drying chamber after Co-based alloy powder and iron(-)base powder being weighed 90min；
(2) ZG 42CrMo surfaces to be treated are subjected to frosting treatment with sand paper polishing, then clean greasy dirt with acetone and treat With；
(3) ZG 42CrMo are subjected to 400 DEG C of the pre-heat treatments, heat 1h；
(4) to after preheating ZG 42CrMo carry out laser consolidation treatment, wherein laser melting use technological parameter for：Swash Luminous power 2000W, sweep speed 200mm/min, spot diameter 5mm, the laser melting layer thickness formed are 0.4mm, consolidation Layer uniform zero defect, flawless；
(5) after treating laser consolidation treatment, coaxial powder-feeding laser melting coating nickel is carried out on established laser melting layer Based alloy prime coat, laser cladding technological parameter are：Laser power 1500W, sweep speed 200mm/min, powder feeding rate 4g/ Min, spot diameter 2mm, protection gas are argon gas with carrying powder gas, wherein protection air-flow amount 6l/min, the nickel-base alloy formed Bottoming layer thickness is 0.4mm；
(6) it is wear-resisting resistance to carry out coaxial powder-feeding laser melting coating ferrous alloy again on established nickel-base alloy prime coat Shock ply, laser cladding technological parameter are：Laser power 2600W, sweep speed 400mm/min, powder feeding rate 7g/min, hot spot Diameter 4mm, protection gas are argon gas with carrying powder gas, wherein protection air-flow amount 15l/min, the wear-resisting resistance to punching of metal alloy formed It is 0.9mm to hit layer thickness, and the laser cladding coating pore-free crackle eventually formed, is well combined with cast steel ZG42CrMo surfaces, Zero defect produces, and wearability test proves：The wear rate of cast steel ZG42CrMo after Laser Cladding Treatment is than independent laser quenching Substantially reduced with untreated cast steel ZG 42CrMo, friction coefficient is substantially reduced, ballistic work increase, its Wear-resistant and resistance to punching Performance is hit to significantly improve.
Embodiment 2
The present embodiment is using cast steel ZG 40Cr as matrix, and bottoming layer material is Co-based alloy powder, chemical composition (each element Mass percent) be：C:0.025%th, Si:0.12%th, Mn:0.43%th, Cr:16%th, Co:2.4%th, Mo:16%th, W:4.2%th, Nb:0.34%th, Fe:0.75%th, Ni:Surplus；Wear and shock-resistant layer material is Co-based alloy powder, chemical composition (each element matter Amount percentage) be：C:0.32%th, Si:3.9%th, Cr:11、B:2.3%th, Fe:10.5%th, Ni:Surplus；Specific implementation step is such as Under：
(1) it is dry in 85 DEG C of vacuum drying chamber after Co-based alloy powder and iron(-)base powder being weighed 100min；
(2) ZG 40Cr surfaces to be treated are subjected to frosting treatment with sand paper polishing, it is stand-by then to clean greasy dirt with acetone；
(3) ZG 40Cr are subjected to 450 DEG C of the pre-heat treatments, heat 1h；
(4) to after preheating ZG 35SiMn carry out laser consolidation treatment, wherein laser melting use technological parameter for：Swash Luminous power 2500W, sweep speed 250mm/min, spot diameter 4mm, the laser melting layer thickness formed are 0.5mm, consolidation Layer uniform zero defect, flawless；
(5) after treating laser consolidation treatment, coaxial powder-feeding laser melting coating nickel is carried out on established laser melting layer Based alloy prime coat, laser cladding technological parameter are：Laser power 2500W, sweep speed 350mm/min, powder feeding rate 5g/ Min, spot diameter 3mm, protection gas are argon gas with carrying powder gas, wherein protection air-flow amount 8l/min, the nickel-base alloy formed Bottoming layer thickness is 0.5mm；
(6) it is wear-resisting resistance to carry out coaxial powder-feeding laser melting coating ferrous alloy again on established nickel-base alloy prime coat Shock ply, laser cladding technological parameter are：Laser power 2200W, sweep speed 350mm/min, powder feeding rate 5g/min, hot spot Diameter 2mm, protection gas are argon gas with carrying powder gas, wherein protection air-flow amount 10l/min, the wear-resisting resistance to punching of metal alloy formed It is 0.8mm to hit layer thickness, and the laser cladding coating pore-free crackle eventually formed, is well combined, nothing with cast steel ZG 40Cr surfaces Defect produces, and wearability and impact resistance test result are similar to Example 1, and Wear-resistant is significantly improved with impact resistance.
Embodiment 3
The present embodiment is using cast steel ZG 35SiMn as matrix, and bottoming layer material is Co-based alloy powder, chemical composition (each member Plain mass percent) be：C:0.03%th, Si:0.14%th, Mn:0.46%th, Cr:16.5%th, Co:2.8%th, Mo:16.5%th, W: 4.6%th, Nb:0.37%th, Fe:0.8%th, Ni:Surplus；Wear and shock-resistant layer material is Co-based alloy powder, chemical composition (each member Plain mass percent) be：C:0.34%th, Si:4.3%th, Cr:11.5%th, B:2.6%th, Fe:11.0%th, Ni:Surplus；It is specific real It is as follows to apply step：
(1) it is dry in 90 DEG C of vacuum drying chamber after Co-based alloy powder and iron(-)base powder being weighed 120min；
(2) ZG 35SiMn surfaces to be treated are subjected to frosting treatment with sand paper polishing, then clean greasy dirt with acetone and treat With；
(3) ZG 35SiMn are subjected to 500 DEG C of the pre-heat treatments, heat 1h；
(4) to after preheating ZG 35SiMn carry out laser consolidation treatment, wherein laser melting use technological parameter for：Swash Luminous power 3500W, sweep speed 350mm/min, spot diameter 6mm, the laser melting layer thickness formed are 0.3mm, consolidation Layer uniform zero defect, flawless；
(5) after treating laser consolidation treatment, coaxial powder-feeding laser melting coating nickel is carried out on established laser melting layer Based alloy prime coat, laser cladding technological parameter are：Laser power 1700W, sweep speed 300mm/min, powder feeding rate 3g/ Min, spot diameter 2mm, protection gas are argon gas with carrying powder gas, wherein protection air-flow amount 6l/min, the nickel-base alloy formed Bottoming layer thickness is 0.3mm；
(6) it is wear-resisting resistance to carry out coaxial powder-feeding laser melting coating ferrous alloy again on established nickel-base alloy prime coat Shock ply, laser power 1800W, sweep speed 250mm/min, powder feeding rate 8g/min, spot diameter 2mm, protection gas is with carrying Powder gas is argon gas, wherein protection air-flow amount 8l/min, and the metal alloy wear and shock-resistant layer thickness formed is 1.0mm, most The laser cladding coating pore-free crackle formed afterwards, is well combined with cast steel ZG 35SiMn surfaces, and zero defect produces, wearability Similar to Example 1 with impact resistance test result, Wear-resistant is significantly improved with impact resistance.
As shown in Fig. 2, wear-resisting composite coating forms good metallurgical binding with 42CrMo cast steel surfaces, binding site is basic Pore-free, defect, coating flawless.
As shown in figure 3,42CrMo cast steels surface is untreated, under conditions of laser consolidation treatment and Laser Cladding Treatment Wear rate is gradually reduced, and illustrates that Laser Cladding Treatment can effectively improve the wearability of compacted black cast steel surface.
As shown in figure 4,42CrMo cast steels surface is untreated, under conditions of laser consolidation treatment and Laser Cladding Treatment Friction coefficient is gradually reduced, and illustrates that Laser Cladding Treatment can effectively improve the anti-attrition of compacted black cast steel surface.
As shown in figure 5, in embodiment 1 42CrMo cast steels in laser consolidation treatment, surface is untreated and laser melting coating at Average impact work(is sequentially increased under conditions of reason, and the more big then impact resistance of ballistic work is better, illustrates Laser Cladding Treatment The impact resistance of compacted black cast steel surface can be effectively improved.
As shown in fig. 6, in embodiment 1 42CrMo cast steels laser melting coating prepare wear and shock-resistant coating at normal temperatures with Wearing layer hardness is substantially unchanged after 500 DEG C of high temperings, and laser melting layer hardness is then remarkably decreased, and illustrates Laser Cladding Treatment The high temperature resistant tempering property of compacted black cast steel surface can be effectively improved.
It should be noted that according to the various embodiments described above of the present invention, those skilled in the art are can to realize this hair completely The four corner of bright independent claims and appurtenance, realize process and the same the various embodiments described above of method；And the present invention is not Elaborate and partly belong to techniques well known.
Above example is provided just for the sake of the description purpose of the present invention, and is not intended to limit the scope of the present invention, it is real It is close with embodiment 1 to test result.The scope of the present invention is defined by the following claims.Do not depart from spirit and principles of the present invention and The various equivalent alterations and modifications made, should all cover within the scope of the present invention.

Claims (12)

  1. A kind of 1. cast steel surface laser cladding wear impact-resistant coating method, it is characterised in that：Include the following steps：
    Step 1: after metal alloy powders are dried in vacuo, treat that post laser cladding uses；
    Step 2: cast steel surface to be treated is carried out frosting treatment, then clean greasy dirt；
    Step 3: the cast steel after being cleaned to step 3 carries out the pre-heat treatment；
    Step 4: carrying out laser consolidation treatment to the cast steel surface after the pre-heat treatment, laser melting layer is formed, eliminates cast steel surface The defects of and hole；
    Step 5: after treating laser consolidation treatment, carried out in the laser melting layer surface that step 4 is formed at laser melting coating Reason, metal alloy powders by coaxial powder-feeding method and by the use of protect gas as load powder air-blowing be sent to cast steel laser melting layer table Face, the laser melting coating metal alloy prime coat on established laser melting layer, as cast steel and metal alloy wear and shock-resistant The articulamentum of layer, makes composite coating form the good combination of pore-free crackle with cast steel surface；
    Step 6: carrying out Laser Cladding Treatment in the metal alloy bottoming layer surface that step 5 is formed, metal alloy powders lead to Coaxial powder-feeding method is crossed and by the use of protecting gas to be blown into cast steel metal alloy bottoming layer surface as powder gas is carried, established Laser melting coating metal alloy wear and shock-resistant layer on metal alloy prime coat.
  2. 2. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：The step Rapid four, 2000~3500W of laser power in laser consolidation treatment, laser scanning 200~350mm/min of speed, laser facula is straight 4~6mm of footpath.
  3. 3. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：The step In rapid four, the laser melting layer thickness is 0.3~0.5mm, the uniform zero defect of consolidation layer, flawless.
  4. 4. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：Step 5 In, 1500~2500W of laser power in Laser Cladding Treatment, 200~350mm/min of laser scan rate, powder feeding rate 3~ 5g/min, 2~4mm of laser spot diameter.
  5. 5. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：The step Rapid five, in step 6, the protection gas is argon gas；6~10l/min of protection air-flow amount in step 5；Gas is protected in step 6 8~15l/min of flow.
  6. 6. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：The step In rapid five, the metal alloy bottoming layer thickness is 0.3~0.5mm.
  7. 7. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：The step In rapid five, the chemical composition (each element mass percent) of metal alloy powders is used by metal alloy prime coat：C: 0.02%~0.03%, Si:0.1%~0.14%, Mn:0.4%~0.46%, Cr:15.5%~16.5%, Co:2.0%~ 2.8%th, Mo:15.5%~16.5%, W:3.8%~4.6%, Nb:0.31%~0.37%, Fe:0.7%~0.8%, Ni: Surplus.
  8. 8. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：Step 6 In, when carrying out Laser Cladding Treatment to cast steel surface, 1800~2600W of laser power, 250~400mm/ of laser scan rate Min, powder 5~8g/min of powder feeding rate, 2~4mm of laser spot diameter.
  9. 9. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：The step In rapid six, the metal alloy wear and shock-resistant layer thickness is 0.8~1.0mm.
  10. 10. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：It is described In step 6, the chemical composition (each element mass percent) of metal alloy powders is used by wear and shock-resistant layer：C: 0.30%~0.34%, Si:3.5%~4.3%, Cr:10.5%~11.5%, B:2.0%~2.6%, Fe:10.0%~ 11.0%th, Ni:Surplus.
  11. 11. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：It is described In step 3, the pretreatment temperature to cast steel is 400~500 DEG C.
  12. 12. cast steel surface laser cladding wear impact-resistant coating method according to claim 1, it is characterised in that：It is described In step 1, metal alloy powders dry 90~120min in 80~90 DEG C of vacuum drying chamber.
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