CN117758165A - Alloy component for laser cladding remanufacturing and preparation method of alloy coating - Google Patents
Alloy component for laser cladding remanufacturing and preparation method of alloy coating Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 145
- 239000000956 alloy Substances 0.000 title claims abstract description 145
- 238000004372 laser cladding Methods 0.000 title claims abstract description 64
- 238000000576 coating method Methods 0.000 title claims abstract description 63
- 239000011248 coating agent Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 56
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 18
- 229910052796 boron Inorganic materials 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000008439 repair process Effects 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000002932 luster Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000005201 scrubbing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 23
- 230000007797 corrosion Effects 0.000 abstract description 23
- 238000005728 strengthening Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000006104 solid solution Substances 0.000 abstract description 5
- 230000003993 interaction Effects 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 238000005253 cladding Methods 0.000 description 45
- 239000000306 component Substances 0.000 description 16
- 238000005299 abrasion Methods 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 229910052580 B4C Inorganic materials 0.000 description 5
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 5
- 230000005496 eutectics Effects 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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Abstract
The invention discloses an alloy component for laser cladding remanufacturing and a preparation method of an alloy coating, wherein the alloy component comprises the following components in percentage by mass: 0.8 to 1.2 percent of C, 5.0 to 7.0 percent of Cr, 9.0 to 10.0 percent of W, 4 to 5 percent of V, 4.0 to 5.0 percent of Co, 1.0 to 2.0 percent of Si, 3.0 to 4.0 percent of B and the balance of Fe; the preparation method comprises the following steps: preparing alloy powder for laser cladding according to alloy components and mass fractions; placing alloy powder on the pretreated 45# steel substrate; and carrying out laser cladding on the alloy powder on the 45# steel substrate to form an alloy coating. According to the invention, through the solid solution strengthening effect of various alloy elements, the fine grain strengthening effect with reduced grain size and the interaction among microstructures, the alloy coating has excellent wear resistance and corrosion resistance, a novel alloy component and a preparation process are provided for repairing and remanufacturing of wear corrosion failure parts, and the method has important practical significance for promoting the application of a laser cladding technology in the remanufacturing field.
Description
Technical Field
The invention belongs to the field of laser cladding remanufacturing, relates to a preparation technology of an alloy coating, and in particular relates to an alloy component for laser cladding remanufacturing and a preparation method of the alloy coating.
Background
Diesel engines, one of the three key components providing propulsion of the vessel, play a decisive role in the normal operation and continuous sailing of the vessel. The camshaft is used as a core component of the diesel engine, abnormal abrasion and corrosion are easy to occur in the service process, huge potential safety hazards are caused to normal navigation of the ship, and meanwhile, huge economic loss is caused by shutdown of the ship. And the waste of a large amount of resources and environmental pollution problems are caused by the replacement of the old parts by the new ones. Therefore, repair remanufacturing of failed cam components has become one of the key issues of great concern.
The laser remanufacturing technology is one of the main green remanufacturing processes greatly developed in China, and has the advantages of high manufacturing efficiency, less post-processing amount, good mechanical property, small heat affected zone and the like. The laser cladding technology is to utilize high-energy laser beams to rapidly melt and solidify alloy powder, and is an unbalanced solidification process, and complex physical and chemical reactions occur in a molten pool. Due to the forming characteristics of laser cladding quenching and rapid heating, the defects of air holes, slag inclusion and the like of the traditional alloy components are easy to exist after laser cladding forming, and further the service performances of the laser cladding remanufactured part such as wear resistance and corrosion resistance are affected. The high-speed steel has the advantages of high hardness, high wear resistance and the like, but the high-speed steel has higher carbon content and other alloy element content, and the problems of serious cracking, segregation and the like can occur in the preparation process of the laser cladding alloy coating, so that the service performance of the laser cladding remanufactured part is affected. Therefore, according to the abrasion corrosion failure mechanism, the remanufacturing performance requirement and the unbalanced solidification forming characteristics of the laser cladding of the diesel engine camshaft, designing the special alloy composition for the laser cladding remanufacturing of the abrasion corrosion failure camshaft is a key for remanufacturing the camshaft.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the alloy composition and the preparation method of the alloy coating for laser cladding remanufacturing are provided, and the alloy coating has excellent wear resistance and corrosion resistance through the solid solution strengthening effect of various alloy elements, the fine crystal strengthening effect with reduced grain size and the interaction among microstructures, so that the novel alloy composition and the preparation process are provided for repairing remanufacturing of wear corrosion failure parts, and have important practical significance for promoting the application of a laser cladding technology in the remanufacturing field.
The technical scheme is as follows: in order to achieve the aim, the invention provides an alloy component for laser cladding remanufacturing, which comprises the following components in percentage by mass:
0.8 to 1.2 percent of C, 5.0 to 7.0 percent of Cr, 9.0 to 10.0 percent of W, 4 to 5 percent of V, 4.0 to 5.0 percent of Co, 1.0 to 2.0 percent of Si, 3.0 to 4.0 percent of B and the balance of Fe.
Further, the alloy composition is used for laser cladding repair remanufacturing of wear-corrosion-failure parts.
The invention also provides a preparation method of the alloy coating for laser cladding remanufacturing, which comprises the following steps:
s1: preparing alloy powder for laser cladding according to alloy components and mass fractions;
s2: placing alloy powder on the pretreated 45# steel substrate;
s3: and carrying out laser cladding on the alloy powder on the 45# steel substrate to prepare an alloy coating.
Further, the alloy components in the step S1 comprise the following components in percentage by mass:
0.8 to 1.2 percent of C, 5.0 to 7.0 percent of Cr, 9.0 to 10.0 percent of W, 4 to 5 percent of V, 4.0 to 5.0 percent of Co, 1.0 to 2.0 percent of Si, 3.0 to 4.0 percent of B and the balance of Fe.
Further, the preparation method of the alloy powder for laser cladding in the step S1 comprises the following steps: and weighing different alloy element powders according to mass percentages, and uniformly mixing the mixed alloy element powders by using a ball mill to obtain the alloy powder for laser cladding.
Further, the grain size of the alloy element powder in the step S1 is 30-70 μm.
Further, the pretreatment method of the 45# steel substrate in the step S2 is as follows: and removing impurities such as oxide skin on the surface of the 45# steel substrate by using an angle grinder to expose metallic luster, further polishing the surface of the 45# steel substrate by using sand paper until the surface is smooth and bright, and scrubbing the surface of the substrate by using acetone and absolute ethyl alcohol in sequence to remove oil stains on the surface.
Further, the alloy powder in step S2 is dried before being placed on the 45# steel substrate, specifically: and (3) placing the alloy powder in a blast drying box and drying for 1-2 h at 80-100 ℃.
Further, the technological parameters of the laser cladding in the step S3 are as follows: the laser power is 2000-2500W, the scanning speed is 4-6 mm/s, the powder layer thickness is 0.5 mm/layer, the lap joint rate is 50%, the light spot diameter is 3mm, the shielding gas is argon, and the gas flow is 2-5L/min.
Further, the thickness of the alloy coating in the step S3 is 1-2 mm.
According to the invention, the alloy powder is melted and solidified by utilizing a high-energy laser beam through a preset alloy powder method, the cladding coating and the 45# steel substrate form good metallurgical bonding, the alloy cladding layer has good formability, and good wear resistance and corrosion resistance are presented.
The innovation points of the invention comprise the following points:
the alloy cladding coating can form high-hardness eutectic boron carbide at the grain boundary in the laser cladding forming process, and the forming principle is as follows: the specific content of B, C in the alloy composition provided by the invention is higher, wherein the solid solubility of B in gamma-Fe is only 0.02%, and B is firstly enriched in an austenite grain boundary after reaching the eutectic transition temperature in the solidification process of a laser melting pool and is combined with C to form high-hardness eutectic boron carbide, which is realized by the specific content ratio and matching relation of B, C in the application.
The solid solution strengthening effect is achieved by the principle that: in the invention, because of the specific content of C, cr and other elements, C, cr and other elements have higher content, boron carbide can be formed in the alloy, and redundant elements can be dissolved in crystal lattices in a solid mode, so that the crystal lattices are distorted, and a strengthening effect is generated.
The alloy cladding coating has fine grain size and plays a role in fine grain strengthening, and the principle is as follows: 1) The laser cladding belongs to an unbalanced solidification forming mode of rapid heating quenching, and the extremely rapid cooling speed leads to that the tissue is not grown up and solidified, so that a fine tissue is formed; 2) Eutectic boron carbide precipitated at grain boundaries during solidification of the cladding coating can inhibit grain growth, thereby forming fine grain sizes.
The beneficial effects are that: compared with the prior art, the invention has the following advantages:
1. the prepared alloy cladding coating has high hardness and excellent wear resistance. The alloy cladding coating obtained by the invention can form high-hardness eutectic boron carbide at the grain boundary in the laser cladding forming process, and the microstructure of the cladding layer is mainly high-hardness martensite, and a small amount of residual austenite exists; the alloy tissue has high content of alloy elements such as C, cr and the like, and plays a role in solid solution strengthening; the alloy cladding coating has fine grain size and plays a role in fine grain strengthening. Under the combined actions of microstructure strengthening, solid solution strengthening and fine grain strengthening, the alloy cladding coating achieves the effects of high hardness and good wear resistance. The average microhardness of the alloy cladding coating reaches 840HV 0.2 5 times of the hardness of the matrix; the abrasion rate of the cladding layer was 1.72X10 -8 mm 3 N.mm, is 3 times the wear resistance of the matrix.
2. The prepared alloy cladding coating has excellent corrosion resistance. Through electrochemical curve analysis of the cladding layer, the corrosion potential of the cladding layer is obviously higher than that of a 45# steel matrix; after electrochemical corrosion, a small number of pitting holes exist on the surface of the cladding layer, so that the corrosion resistance of the failure part can be remarkably improved.
Drawings
FIG. 1 is a laser formable topography of a cladding layer;
FIG. 2 is a graph of microhardness of a cladding layer;
FIG. 3 is an electrochemical Tafel plot of a cladding layer.
Detailed Description
The present invention is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the invention and not limiting of its scope, and various modifications of the invention, which are equivalent to those skilled in the art upon reading the invention, will fall within the scope of the invention as defined in the appended claims.
Example 1:
the embodiment provides an alloy component for laser cladding remanufacturing, which comprises the following components in percentage by mass:
C:0.8％，Cr:5.0％，W:9.0％，V:4％，Co:4.0％，Si:1.0％，B:3.0％，Fe：73.2％。
in this embodiment, the alloy composition is used for laser cladding repair remanufacturing of a wear corrosion failure camshaft of a diesel engine, and the preparation method of the alloy coating for laser cladding remanufacturing is provided, and comprises the following steps:
1) Weighing different alloy element powders according to mass percentage, wherein the particle size of the alloy element powders is 30-70 mu m, and uniformly mixing the alloy element powders by using a ball mill at the rotating speed of 300r/min for 8 hours to obtain alloy powder for laser cladding;
2) Removing impurities such as oxide skin on the surface of the 45# steel substrate by using an angle grinder to expose metallic luster, further polishing the surface of the 45# steel substrate by using sand paper until the surface is smooth and bright, and scrubbing the surface of the substrate by using acetone and absolute ethyl alcohol in sequence to remove oil stains on the surface;
3) Placing the alloy powder into a blast drying oven to be dried for 1h at 100 ℃;
4) Pre-laying the dried alloy powder on the pretreated 45# steel substrate by using a powder laying tool;
5) Carrying out laser cladding on alloy powder on a 45# steel substrate to prepare an alloy coating;
the technological parameters of laser cladding are as follows: the laser power is 2000W, the scanning speed is 4mm/s, the lap joint rate is 50%, the light spot diameter is 3mm, the shielding gas is argon, the gas flow is 2L/min, and the powder layer thickness is 0.5 mm/layer;
the thickness of the finally formed alloy coating was 1mm.
Example 2:
the embodiment provides an alloy component for laser cladding remanufacturing, which comprises the following components in percentage by mass:
C:1.2％，Cr:7.0％，W:10.0％，V:5.0％，Co:5.0％，Si:2.0％，B:4.0％，Fe：65.8％。
in this embodiment, the alloy composition is used for laser cladding repair remanufacturing of a wear corrosion failure camshaft of a diesel engine, and the preparation method of the alloy coating for laser cladding remanufacturing is provided, and comprises the following steps:
1) Weighing different alloy element powders according to mass percentage, wherein the particle size of the alloy element powders is 30-70 mu m, and uniformly mixing the mixed alloy element powders by using a ball mill at the rotating speed of 300r/min for 8 hours to obtain alloy powder for laser cladding;
2) Removing impurities such as oxide skin on the surface of the 45# steel substrate by using an angle grinder to expose metallic luster, further polishing the surface of the 45# steel substrate by using sand paper until the surface is smooth and bright, and scrubbing the surface of the substrate by using acetone and absolute ethyl alcohol in sequence to remove oil stains on the surface;
3) Placing the alloy powder into a blast drying oven to be dried for 2 hours at 80 ℃;
4) Pre-laying the dried alloy powder on the pretreated 45# steel substrate by using a powder laying tool;
5) Carrying out laser cladding on alloy powder on a 45# steel substrate to prepare an alloy coating;
the technological parameters of laser cladding are as follows: the laser power is 2500W, the scanning speed is 6mm/s, the lap joint rate is 50%, the light spot diameter is 3mm, the shielding gas is argon, the gas flow is 5L/min, and the powder layer thickness is 0.5 mm/layer;
the thickness of the finally formed alloy coating was 2mm.
Example 3:
the embodiment provides an alloy component for laser cladding remanufacturing, which comprises the following components in percentage by mass:
C:1.0％，Cr:6.0％，W:9.5％，V:4.5％，Co:4.5％，Si:1.5％，B:3.6％，Fe：69.4％。
in this embodiment, the alloy composition is used for laser cladding repair remanufacturing of a wear corrosion failure camshaft of a diesel engine, and the preparation method of the alloy coating for laser cladding remanufacturing is provided, and comprises the following steps:
1) Weighing different alloy element powders according to mass percentage, wherein the particle size of the alloy element powders is 30-70 mu m, and uniformly mixing the mixed alloy element powders by using a ball mill at the rotating speed of 300r/min for 8 hours to obtain alloy powder for laser cladding;
2) Removing impurities such as oxide skin on the surface of the 45# steel substrate by using an angle grinder to expose metallic luster, further polishing the surface of the 45# steel substrate by using sand paper until the surface is smooth and bright, and scrubbing the surface of the substrate by using acetone and absolute ethyl alcohol in sequence to remove oil stains on the surface;
3) Placing the alloy powder in a blast drying oven to be dried for 1.5h at 90 ℃;
4) Pre-laying the dried alloy powder on the pretreated 45# steel substrate by using a powder laying tool;
5) Carrying out laser cladding on alloy powder on a 45# steel substrate to prepare an alloy coating;
the technological parameters of laser cladding are as follows: the laser power is 2300W, the scanning speed is 5mm/s, the lap joint rate is 50%, the diameter of a light spot is 3mm, the shielding gas is argon, the gas flow is 4L/min, and the thickness of a powder layer is 0.5 mm/layer;
the thickness of the finally formed alloy coating was 1.5mm.
In order to verify the effectiveness and practical effect of the scheme of the invention, in this example, hardness, wear rate and electrochemical corrosion performance of the alloy cladding coatings prepared in example 1, example 2 and example 3 are respectively tested, and specific test results and analysis are as follows:
(1) Analysis of formability of alloy cladding coatings
The alloy cladding coatings of examples 1-3 all show good laser formability, no obvious defects such as cracks, air holes and slag inclusion exist in the alloy cladding coating, and the macroscopic morphology and the cross-sectional morphology of the cladding layer are shown in figure 1.
(2) Microstructure analysis of alloy cladding coatings
The microstructure of the alloy cladding coatings of examples 1-3 is predominantly martensitic, grain boundary borocarbides, and small amounts of retained austenite. Due to the fact that the cooling rates of the alloy cladding coatings are different under different laser cladding processes, the microstructure content in the alloy cladding coatings of different embodiments is slightly changed.
(3) Microhardness analysis of alloy cladding coating
The microhardness curves of the alloy cladding coatings of examples 1-3 are shown in FIG. 2, and it is understood from FIG. 2 that the hardness curves consist of the alloy cladding coating, the heat affected zone, and the matrix. The average hardness of the alloy cladding coating of example 1 was 840HV 0.2 The average hardness of the alloy cladding coating of example 2 was 880HV 0.2 The average hardness of the alloy cladding coating of example 3 was 830HV 0.2 The hardness is improved by about 5 times compared with the hardness of a matrix (173 HV).
(4) Alloy cladding coating wear resistance analysis
Wear resistance test of alloy cladding coatings of examples 1-3 Using Al 2 O 3 The abrasion load is 10N, the abrasion mode adopts a reciprocating abrasion mode, the abrasion duration is 60min, the abrasion volume of the cladding layer is measured by a white light interferometer, and the abrasion rate of the embodiment 1-3 is calculated to be 1.72 multiplied by 10 -8 mm 3 /N·mm、2.38×10 -8 mm 3 N.mm and 2.51X10 -8 mm 3 N.mm, its wear resistance is higher than that of 45# steel matrix (8.22×10 -8 mm 3 N.mm) was increased by a factor of 3. Analysis of the wear morphology of the alloy cladding layers revealed that the wear mechanisms of the alloy cladding layers of examples 1-3 were all mixed wear mechanisms of abrasive wear, adhesive wear and oxidative wear.
(5) Analysis of corrosion resistance of cladding layer
The electrochemical Tafel curves of the alloy cladding coatings of examples 1-3 are shown in FIG. 3, and the corrosion potential and corrosion current density of the cladding alloy coatings were analyzed by an epitaxial method, wherein the corrosion potential of the alloy cladding coatings of examples 1-3 was-520 mV, -506mV and-560 mV in this order, and the corrosion current density was 2.58E-5A/cm in this order 2 、2.98E-5A/cm 2 And 2.67E-5A/cm 2 . The alloy cladding coating has good corrosion resistance, and by analyzing the corrosion morphology of the sample after electrochemical test, a small number of pitting holes exist on the surface of the alloy cladding coating, and the corrosion mechanism is pitting.
Claims (10)
1. The alloy composition for laser cladding remanufacturing is characterized by comprising the following components in percentage by mass:
0.8 to 1.2 percent of C, 5.0 to 7.0 percent of Cr, 9.0 to 10.0 percent of W, 4 to 5 percent of V, 4.0 to 5.0 percent of Co, 1.0 to 2.0 percent of Si, 3.0 to 4.0 percent of B and the balance of Fe.
2. An alloy composition for laser cladding remanufacturing according to claim 1, wherein the alloy composition is for laser cladding repair remanufacturing of wear-and-corrosion-failed components.
3. The preparation method of the alloy coating for laser cladding remanufacturing is characterized by comprising the following steps of:
s1: preparing alloy powder for laser cladding according to alloy components and mass fractions;
s2: placing alloy powder on the pretreated 45# steel substrate;
s3: and carrying out laser cladding on the alloy powder on the 45# steel substrate to prepare an alloy coating.
4. The method for preparing the alloy coating for laser cladding remanufacturing according to claim 3, wherein the alloy components in the step S1 comprise the following components in percentage by mass:
0.8 to 1.2 percent of C, 5.0 to 7.0 percent of Cr, 9.0 to 10.0 percent of W, 4 to 5 percent of V, 4.0 to 5.0 percent of Co, 1.0 to 2.0 percent of Si, 3.0 to 4.0 percent of B and the balance of Fe.
5. The method for preparing an alloy coating for laser cladding remanufacturing according to claim 4, wherein the preparing method of the alloy powder for laser cladding in step S1 comprises: and weighing different alloy element powders according to mass percentages, and uniformly mixing the alloy element powders by using a ball mill to obtain the alloy powder for laser cladding.
6. The method for producing an alloy coating for laser cladding remanufacturing according to claim 5, wherein the alloy element powder in step S1 has a particle size of 30-70 μm.
7. The method for preparing an alloy coating for laser cladding remanufacturing according to claim 3, wherein the pretreatment method of the 45# steel substrate in step S2 comprises: and removing impurities on the surface of the 45# steel substrate by using an angle grinder to expose metallic luster, further polishing the surface of the 45# steel substrate by using sand paper until the surface is smooth and bright, and scrubbing the surface of the substrate by using acetone and absolute ethyl alcohol in sequence to remove oil stains on the surface.
8. The method for preparing an alloy coating for laser cladding remanufacturing according to claim 3, wherein the step S2 of drying the alloy powder before placing the alloy powder on the 45# steel substrate comprises the following steps: and (5) placing the alloy powder into a blast drying box for drying.
9. The method for preparing an alloy coating for laser cladding remanufacturing according to claim 3, wherein the process parameters of laser cladding in step S3 are as follows: the laser power is 2000-2500W, the scanning speed is 4-6 mm/s, the lap joint rate is 50%, the light spot diameter is 3mm, the shielding gas is argon, the gas flow is 2-5L/min, and the powder layer thickness is 0.5 mm/layer.
10. The method for preparing an alloy coating for laser cladding remanufacturing according to claim 3, wherein the thickness of the alloy coating in step S3 is 1-2 mm.
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