CN111604652A - Resistance butt welding preparation method of high-entropy alloy coating - Google Patents
Resistance butt welding preparation method of high-entropy alloy coating Download PDFInfo
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- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0068—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only nitrides
Abstract
The invention provides a resistance butt welding preparation method of a high-entropy alloy coating, which comprises the following steps: firstly, preparing a high-entropy alloy block; secondly, cutting the high-entropy alloy block into high-entropy alloy sheets; thirdly, grinding and polishing the high-entropy alloy sheet and the substrate and carrying out laser microtexture; fourthly, pressing the high-entropy alloy sheet on the base material, and filling gaps between the high-entropy alloy sheet and the base material with alloy powder; fifthly, connecting the high-entropy alloy sheet and the base material together by using direct current to pass through the base material and the high-entropy alloy sheet and by using a direct current resistance butt welding process. The invention can obtain the high-entropy alloy coating which has uniform tissue distribution, no internal defect and good metallurgical bonding with the base material and has controllable size, shape and thickness.
Description
Technical Field
The invention relates to the field of coating preparation, in particular to a resistance butt welding preparation method of a high-entropy alloy coating.
Background
Compared with the traditional alloy, the high-entropy alloy does not form complex intermetallic compounds, but forms simple crystalline phases, thereby presenting excellent high-temperature stability, wear resistance, corrosion resistance and other characteristics. Compared with the preparation of the high-entropy alloy integral material, the preparation of the high-entropy alloy coating on the surface of the base material is the most effective way for fully utilizing the excellent performance of the high-entropy alloy. The preparation method of the high-entropy alloy coating commonly used at present mainly comprises magnetron sputtering, laser cladding, thermal spraying, electric spark deposition, plasma sintering and the like. However, these processes have the disadvantages of high processing cost, difficulty in obtaining a coating with a large thickness, uneven distribution of coating tissues, low bonding strength, low preparation efficiency and the like.
Therefore, the search for a preparation process of the high-entropy alloy coating with low processing cost, simple processing technology, good processing quality and controllable thickness is a key point of the current research.
Disclosure of Invention
The invention aims to provide a method for preparing a high-entropy alloy coating by resistance butt welding, which has controllable size, shape and thickness and can give full play to the high performance of the high-entropy alloy, aiming at the defects of the existing high-entropy alloy coating preparation process.
In order to achieve the purpose, the invention adopts the following technical scheme: the method comprises the following steps:
firstly, high-entropy alloy powder is well proportioned according to the performance requirement required by a coating, and is subjected to powder metallurgy after being uniformly mixed by a ball mill to prepare a high-entropy alloy block;
secondly, cutting the high-entropy alloy block into high-entropy alloy sheets by utilizing a linear cutting process according to the size, the surface appearance, the required thickness of the coating and the like of the base material;
thirdly, grinding and polishing the high-entropy alloy sheet and the base material, carrying out laser micro-texture on the lower surface of the high-entropy alloy sheet and the upper surface of the base material, forming a plurality of first longitudinal grooves on the upper surface of the base material through the laser micro-texture, forming a plurality of second longitudinal grooves on the lower surface of the high-entropy alloy sheet through the laser micro-texture, wherein the first longitudinal grooves and the second longitudinal grooves can be meshed in a staggered mode, forming a plurality of transverse grooves on the upper surface of the base material through the laser micro-texture, and the groove depth of each transverse groove is smaller than that of each first longitudinal groove;
fourthly, alloy powder with a certain height is filled in the first longitudinal groove, the high-entropy alloy sheet is pressed on the base material, the first longitudinal groove and the second longitudinal groove are matched in a staggered mode, and the alloy powder fills gaps between the high-entropy alloy sheet and the base material;
fifthly, connecting the high-entropy alloy sheet and the base material together by using direct current to pass through the base material and the high-entropy alloy sheet and by using a direct current resistance butt welding process.
Further, the high-entropy alloy powder comprises at least five of the following: al, Co, Cr, Fe, Ni, Zr, Nb, Ti, Mn, W and V, wherein the purity of a single component of the high-entropy alloy powder is more than or equal to 99%.
Further, the high-entropy alloy powder further comprises ceramic reinforcing particles, and the ceramic reinforcing particles comprise at least one of the following: TiC ceramic reinforced particle, TiN ceramic reinforced particle, B4The ceramic reinforcing particles comprise C ceramic reinforcing particles, NbC ceramic reinforcing particles, VC ceramic reinforcing particles and WC ceramic reinforcing particles, wherein the size of the ceramic reinforcing particles is 3-20 mu m.
Further, the surface laser microtexturing treatment is completed by adopting a picosecond laser, the width and the depth of a first longitudinal groove are both greater than 20% of those of a second longitudinal groove, the width of the first longitudinal groove is 50-1000 μm, the depth of the first longitudinal groove is 80-1200 μm, the distance of the first longitudinal groove is 100-; the width of the transverse grooves is 20-60 mu m, the depth of the transverse grooves is 20-240 mu m, the interval of the transverse grooves is 80-150 mu m, and the length of the transverse grooves is equal to the transverse length of the base material.
Further, the alloy powder includes: high-entropy alloy powder (50%) and base material powder (50%), wherein the particle size of the base material powder is 3-20 micrometers, and the filling height of the alloy powder is 1/3 of the depth of the first longitudinal groove;
further, the melting point of the base material is lower than that of the high-entropy alloy sheet, so that the base material is melted and wraps the micro-melted high-entropy alloy sheet in the resistance butt welding process.
Further, the welding current of the direct current resistance butt welding is 100-1000A, the alloy powder in the groove is firstly melted by gradually adjusting the current, then the base material is melted, finally the high-entropy alloy sheet is in a micro-melting state, 1-50N upsetting pressure is applied in the direct current resistance butt welding process, the upsetting pressure is smaller when the alloy powder is melted, and the upsetting pressure is increased along with the gradual melting of the base material and the high-entropy alloy sheet, and the direct current resistance butt welding duration is 3-20 ms.
Further, liquid nitrogen is continuously sprayed on the high-entropy alloy sheet and the base material in the direct-current resistance butt welding process, and the welding part is forcibly cooled, so that the thermal stress is reduced, and the thermal deformation when the base material is combined with the high-entropy alloy sheet is reduced.
Compared with the prior art, the invention provides a resistance butt welding preparation method of a high-entropy alloy coating, which has the following beneficial effects:
1. the high-entropy alloy coating prepared by the method has uniform structure, no defect and good metallurgical bonding with the base material, and the characteristics of the high-performance high-entropy alloy sheet obtained by powder metallurgy can be fully exerted.
2. According to the invention, in the direct-current resistance butt welding process, the temperature generated at the joint interface can be adjusted by controlling the current so as to sequentially melt the alloy powder, the base material and the high-entropy alloy sheet, and the thermal stress can be obviously reduced and the thermal deformation can be reduced by using liquid nitrogen to forcibly cool in the direct-current resistance butt welding process.
3. The preparation method is simple, the processing cost is lower, the operation controllability is strong, the size, the shape and the thickness of the coating are controllable, and the application range is wide.
Drawings
FIG. 1 is a schematic view of the structure of the upper surface of the substrate in example 1.
FIG. 2 is a schematic cross-sectional view of a substrate of example 1.
FIG. 3 is a schematic view of the states of the high-entropy alloy sheet and the base material in the direct resistance butt welding of example 1.
FIG. 4 is a schematic view of the structure of the circular micro-pits on the upper surface of the substrate in example 2.
FIG. 5 is a schematic view of the structure of the circular microprotrusions on the lower surface of the high-entropy alloy sheet of example 2.
FIG. 6 is a schematic diagram of a square dimple structure on the top surface of a substrate in accordance with example 3.
FIG. 7 is a schematic view of the structure of square microprotrusions on the lower surface of a high entropy alloy sheet of example 3.
FIG. 8 is a schematic view of a composite structure of circular micro-pits and square micro-pits on the upper surface of the substrate in example 4.
Wherein: 1-a substrate; 2-a first longitudinal groove; 3-transverse grooves; 4 alloy powder; 5-high entropy alloy flakes; 6-upper electrode; 7-a lower electrode; 8-circular micro-pits; 9-round microprotrusions; 10-square micro-pits; 11-square microprotrusions.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
As shown in FIGS. 1 to 3, the invention provides a resistance butt welding preparation method of a high-entropy alloy coating, which comprises the following steps:
A. according to the comprehensive mechanical property requirement required by the coating, the components of Al, Co, Cr, Fe and Ni high-entropy alloy powder with the powder particle size of 3-20 mu m are well mixed, and the mixture is subjected to powder metallurgy after being uniformly mixed for 10 hours by a ball mill to prepare a high-entropy alloy block;
B. the high-entropy alloy coating is made of 316L stainless steel with the base material size of 100mm by 50mm by 30mm, the required thickness of the high-entropy alloy coating is 15mm, and the high-entropy alloy sheet 5 with the thickness of 15mm and the same size as the base material is obtained by cutting the prepared high-entropy alloy block through a wire cutting process;
C. grinding and polishing the high-entropy alloy sheet 5 and the substrate 1 to reduce the surface roughness to Ra0.5, carrying out micro-texture processing on the substrate 1 and the high-entropy alloy sheet 5 by adopting a picosecond laser, forming a plurality of first longitudinal grooves 2 and transverse grooves 3 on the upper surface of the substrate 1, forming second longitudinal grooves on the lower surface of the high-entropy alloy sheet 5, wherein the width and the depth of each first longitudinal groove are both greater than 20% of that of each second longitudinal groove, the width and the depth of each first longitudinal groove 2 are 500 micrometers, the depth of each first longitudinal groove 2 is 210 micrometers, the distance between the first longitudinal grooves is 100 micrometers, and the length of each first longitudinal groove 2 is equal to the longitudinal length of the substrate 1 and is 50 mm; the width of each transverse groove is 40 mu m, the depth of each transverse groove is 50 mu m, the distance between the transverse grooves is 80 mu m, the length of each transverse groove is equal to the transverse length of 100mm of the base material 1, Al, Co, Cr, Fe and Ni high-entropy alloy powder and 316L stainless steel powder are uniformly mixed according to a ratio of 1:1 to prepare alloy powder 4, and the alloy powder 4 is filled into the first longitudinal groove, wherein the filling height is 70 mu m;
D. connecting the upper surface of a high-entropy alloy sheet 5 with an upper electrode 6, connecting the lower surface of a base material 1 with a lower electrode 7, connecting the high-performance high-entropy alloy sheet 5 with the base material 1 filled with alloy powder through a direct-current resistance butt welding process, controlling the alloy powder 4 in a groove to be firstly melted by gradually adjusting the current, then adjusting the current to 150A, starting melting the base material 1, finally adjusting the current to 200A, keeping the high-entropy alloy sheet 5 in a micro-melting state, applying a small top forging pressure 1N when the alloy powder 4 starts to be melted, increasing the top forging pressure to 5N along with the gradual melting of the base material 1 and the high-entropy alloy sheet 5, keeping the welding duration for 5ms, carrying out liquid nitrogen forced cooling on the high-entropy alloy sheet 5 and the base material 1 in the direct-current resistance butt welding process, and further obtaining good metallurgical bonding, The shape, the size and the thickness of the high-performance high-entropy alloy coating are controllable, and the thermal stress is small.
Tensile test and microhardness test were performed on the test specimens to obtain the specimens prepared in this exampleThe bonding strength of the AlCoCrFeNi high-entropy alloy coating and 316L stainless steel is 556.8MPa, and the microhardness is 788.5HV. The invention can obtain the high-entropy alloy coating with high bonding strength with the base material and excellent performance.
Example 2
As shown in fig. 4-5, the invention provides a resistance butt welding preparation method of a high-entropy alloy coating, which comprises the following steps:
A. according to the comprehensive mechanical property requirement required by the coating, the high-entropy alloy powder of Al, Co, Cr, Fe and Ni with the powder particle size of 3-20 mu m is prepared by well proportioning the components, adding 10% of TiC ceramic reinforced particles, uniformly mixing for 10h by a ball mill, and then performing powder metallurgy on the mixture to prepare a high-entropy alloy block;
B. the method comprises the following steps of (1) obtaining the IN718 high-temperature alloy with the substrate size of 100mm by 50mm by 30mm, obtaining the high-entropy alloy sheet 5 with the thickness of 20mm, wherein the required thickness of the high-entropy alloy coating is 20mm, and cutting the prepared high-entropy alloy block by a wire cutting process to obtain the high-entropy alloy sheet 5 with the same size as the substrate size;
C. grinding and polishing the high-entropy alloy sheet 5 and the substrate 1 to reduce the surface roughness to Ra0.5, carrying out micro-texture processing on the substrate 1 and the high-entropy alloy sheet 5 by adopting a picosecond laser, forming a plurality of circular micro-pits 8 and transverse grooves 3 on the upper surface of the substrate 1, forming circular micro-protrusions 9 on the lower surface of the high-entropy alloy sheet 5, wherein the diameter and the depth of each circular micro-pit are respectively greater than 20% of each circular micro-protrusion, and the diameter, the depth and the interval between the circular micro-pits 8 are 500 mu m, 210 mu m and 200 mu m respectively; the width of each transverse groove is 40 mu m, the depth of each transverse groove is 50 mu m, the distance between the transverse grooves is 200 mu m, the length of each transverse groove is equal to the transverse length of 100mm of the base material 1, Al, Co, Cr, Fe and Ni high-entropy alloy powder and IN718 high-temperature alloy powder are uniformly mixed according to a ratio of 1:1 to prepare alloy powder 4, and the alloy powder 4 is filled into the circular micro-pits 8, wherein the filling height is 70 mu m;
D. connecting the upper surface of a high-entropy alloy sheet 5 with an upper electrode 6, connecting the lower surface of a base material 1 with a lower electrode 7, connecting the high-performance high-entropy alloy sheet 5 with the base material 1 filled with alloy powder through a direct-current resistance butt welding process, controlling the alloy powder 4 in a pit to be firstly melted by gradually adjusting the current, then adjusting the current to 180A to ensure that the base material 1 is melted, finally adjusting the current to 250A to ensure that the high-entropy alloy sheet 5 is in a micro-melting state, applying a small upsetting pressure 2N when the alloy powder 4 is melted, increasing the upsetting pressure to 10N along with the gradual melting of the base material 1 and the high-entropy alloy sheet 5, ensuring that the welding duration is 6ms, and carrying out forced cooling of liquid nitrogen on the high-entropy alloy sheet 5 and the base material 1 in the direct-current resistance butt welding process to further obtain good metallurgical bonding, The shape, the size and the thickness of the high-performance ceramic particle reinforced high-entropy alloy coating are controllable, and the thermal stress is small.
Tensile test and microhardness test are carried out on the sample, and the bonding strength of the AlCoCrFeNi +10% TiC high-entropy alloy coating prepared IN the embodiment and the IN718 high-temperature alloy is 588.2MPa and the microhardness is 856.7 HV. The invention can obtain the high-entropy alloy coating with high bonding strength with the base material and excellent performance.
Example 3
As shown in FIGS. 6-7, the invention provides a resistance butt welding preparation method of a high-entropy alloy coating, which comprises the following steps:
A. according to the comprehensive mechanical property requirement required by the coating, the high-entropy alloy powder of Al, Co, Cr, Ti and Mn with the powder particle size of 3-20 microns is prepared by well mixing the components, adding 20% of TiN ceramic reinforced particles, uniformly mixing for 10h by a ball mill, and then performing powder metallurgy on the mixture to prepare a high-entropy alloy block;
B. the method comprises the following steps of (1) cutting a TC4 titanium alloy with the base material size of 100mm by 50mm by 30mm, wherein the required thickness of a high-entropy alloy coating is 30mm, and cutting a prepared high-entropy alloy block by a wire cutting process to obtain a high-entropy alloy sheet 5 with the thickness of 30mm, and the size of the high-entropy alloy sheet is the same as that of the base material;
C. polishing the high-entropy alloy sheet 5 and the substrate 1 to reduce the surface roughness to Ra0.5, carrying out micro-texture processing on the substrate 1 and the high-entropy alloy sheet 5 by adopting a picosecond laser, forming a plurality of square micro-pits 10 and transverse grooves 3 on the upper surface of the substrate 1, forming square micro-protrusions 11 on the lower surface of the high-entropy alloy sheet 5, wherein the side length and the depth of each square micro-pit are both greater than 20% of each square micro-protrusion, and the side length of each square micro-pit 10 is 500 mu m, the depth is 210 mu m, and the distance between the square micro-pits is 300 mu m; the width of each transverse groove is 40 mu m, the depth of each transverse groove is 50 mu m, the distance between the transverse grooves is 300 mu m, the length of each transverse groove is equal to 100mm of the transverse length of the base material 1, Al, Co, Cr, Ti and Mn high-entropy alloy powder and TC4 titanium alloy powder are uniformly mixed according to a ratio of 1:1 to prepare alloy powder 4, the alloy powder 4 is filled into the square micro-pits 10, and the filling height is 70 mu m;
D. connecting the upper surface of a high-entropy alloy sheet 5 with an upper electrode 6, connecting the lower surface of a base material 1 with a lower electrode 7, connecting the high-performance high-entropy alloy sheet 5 with the base material 1 filled with alloy powder through a direct-current resistance butt welding process, controlling the alloy powder 4 in a pit to be firstly melted by gradually adjusting the current, then adjusting the current to 200A to ensure that the base material 1 is melted, finally adjusting the current to 300A to ensure that the high-entropy alloy sheet 5 is in a micro-melting state, applying a smaller upsetting pressure 3N when the alloy powder 4 is melted, increasing the upsetting pressure to 15N along with the gradual melting of the base material 1 and the high-entropy alloy sheet 5, ensuring that the welding duration is 8ms, and carrying out forced cooling of liquid nitrogen on the high-entropy alloy sheet 5 and the base material 1 in the direct-current resistance butt welding process to further obtain good metallurgical bonding, The shape, the size and the thickness of the high-performance ceramic particle reinforced high-entropy alloy coating are controllable, and the thermal stress is small.
Tensile test and microhardness test are carried out on the sample, and the bonding strength of the AlCoCrTiMn +20% TiN high-entropy alloy coating prepared by the embodiment and the TC4 titanium alloy is 628.5MPa and the microhardness is 936.2 HV. The invention can obtain the high-entropy alloy coating with high bonding strength with the base material and excellent performance.
Example 4
As shown in fig. 5, 7 and 8, the invention provides a resistance butt welding preparation method of a high-entropy alloy coating, which comprises the following steps:
A. according to the comprehensive mechanical property requirement required by the coating, the high-entropy alloy powder of Al, Co, Cr, Fe, Ti and Mn with the powder particle size of 3-20 mu m is well mixed in component ratio, 30% of WC ceramic reinforced particles are added, and the mixture is subjected to powder metallurgy after being uniformly mixed for 10 hours by a ball mill to prepare a high-entropy alloy block;
B. q235 steel with the base material size of 100mm 50mm 30mm, the required thickness of the high-entropy alloy coating is 35mm, and the high-entropy alloy block body which is prepared by the wire cutting process is cut to obtain a high-entropy alloy sheet 5 with the thickness of 35mm and the same size as the base material;
C. polishing the high-entropy alloy sheet 5 and the substrate 1 to reduce the surface roughness to Ra0.5, adopting a picosecond laser to carry out microtexture processing on the substrate 1 and the high-entropy alloy sheet 5, arranging a plurality of round micro-pits 8, square micro-pits 10 and transverse grooves 3 which are alternately distributed on the upper surface of the substrate 1, arranging corresponding round micro-bulges 9 and square micro-bulges 11 on the lower surface of the high-entropy alloy sheet 5, wherein the diameters, the side lengths and the depths of the round micro-pits and the square micro-pits are respectively greater than 20% of the diameters, the side lengths and the depths of the round micro-bulges and the square micro-bulges, the diameters of the round micro-pits 8 are 500 mu m, the depths of the square micro-pits are respectively 210 mu m, and the distances between the round micro-pits and the square micro-pits are respectively 300 mu m; the width of each transverse groove is 40 micrometers, the depth of each transverse groove is 50 micrometers, the distance between the transverse grooves is 300 micrometers, the length of each transverse groove is equal to 100mm of the transverse length of the base material 1, high-entropy alloy powder of Al, Co, Cr, Fe, Ti and Mn and Q235 steel alloy powder are uniformly mixed according to a ratio of 1:1 to prepare alloy powder 4, the alloy powder 4 is filled into the round micro pits 8 and the square micro pits 10, and the filling height is 70 micrometers;
D. connecting the upper surface of a high-entropy alloy sheet 5 with an upper electrode 6, connecting the lower surface of a base material 1 with a lower electrode 7, connecting the high-performance high-entropy alloy sheet 5 with the base material 1 filled with alloy powder through a direct-current resistance butt welding process, controlling the alloy powder 4 in a pit to be firstly melted by gradually adjusting the current, then adjusting the current to 250A to ensure that the base material 1 starts to be melted, finally adjusting the current to 350A to ensure that the high-entropy alloy sheet 5 is in a micro-melting state, applying a small top forging pressure 5N when the alloy powder 4 starts to be melted, increasing the top forging pressure to 20N along with the gradual melting of the base material 1 and the high-entropy alloy sheet 5, ensuring the welding duration to be 10ms, and carrying out forced cooling of liquid nitrogen on the high-entropy alloy sheet 5 and the base material 1 in the direct-current resistance butt welding process so as to obtain good metallurgical bonding, The shape, the size and the thickness of the high-performance ceramic particle reinforced high-entropy alloy coating are controllable, and the thermal stress is small.
Tensile test and microhardness test are carried out on the sample, and the bonding strength between the AlCoCrFeTiMn +30% WC high-entropy alloy coating prepared in the embodiment and Q235 steel is 483.5MPa and the microhardness is 1125.7 HV. The invention can obtain the high-entropy alloy coating with high bonding strength with the base material and excellent performance.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications that can be made by those skilled in the art are within the scope of the present invention without departing from the spirit of the present invention.
Claims (8)
1. A resistance butt welding preparation method of a high-entropy alloy coating comprises the following steps:
firstly, high-entropy alloy powder is well proportioned according to the performance requirement required by a coating, and is subjected to powder metallurgy after being uniformly mixed by a ball mill to prepare a high-entropy alloy block;
secondly, cutting the high-entropy alloy block into high-entropy alloy sheets by utilizing a linear cutting process according to the size, the surface appearance, the required thickness of the coating and the like of the base material;
thirdly, grinding and polishing the high-entropy alloy sheet and the base material, carrying out laser micro-texture on the lower surface of the high-entropy alloy sheet and the upper surface of the base material, forming a plurality of first longitudinal grooves on the upper surface of the base material through the laser micro-texture, forming a plurality of second longitudinal grooves on the lower surface of the high-entropy alloy sheet through the laser micro-texture, wherein the first longitudinal grooves and the second longitudinal grooves can be meshed in a staggered mode, forming a plurality of transverse grooves on the upper surface of the base material through the laser micro-texture, and the groove depth of each transverse groove is smaller than that of each first longitudinal groove;
fourthly, alloy powder with a certain height is filled in the first longitudinal groove, the high-entropy alloy sheet is pressed on the base material, the first longitudinal groove and the second longitudinal groove are matched in a staggered mode, and the alloy powder fills gaps between the high-entropy alloy sheet and the base material;
fifthly, connecting the high-entropy alloy sheet and the base material together by using direct current to pass through the base material and the high-entropy alloy sheet and by using a direct current resistance butt welding process.
2. The butt resistance welding preparation method of the high-entropy alloy coating according to claim 1, wherein the high-entropy alloy powder comprises at least five of the following: al, Co, Cr, Fe, Ni, Zr, Nb, Ti, Mn, W and V, wherein the purity of a single component of the high-entropy alloy powder is more than or equal to 99%.
3. The butt resistance welding preparation method of the high-entropy alloy coating according to claim 2, wherein the high-entropy alloy powder further comprises ceramic reinforcing particles, and the ceramic reinforcing particles comprise at least one of the following: TiC ceramic reinforced particle, TiN ceramic reinforced particle, B4The ceramic reinforcing particles comprise C ceramic reinforcing particles, NbC ceramic reinforcing particles, VC ceramic reinforcing particles and WC ceramic reinforcing particles, wherein the size of the ceramic reinforcing particles is 3-20 mu m.
4. The butt resistance welding preparation method for the high-entropy alloy coating as claimed in claim 1, wherein the surface laser microtexture treatment is performed by a picosecond laser, the width and depth of the first longitudinal groove are both greater than 20% of the second longitudinal groove, the width and depth of the first longitudinal groove are 50-1000 μm, 80-1200 μm and the distance between the first longitudinal groove and the second longitudinal groove is 100-800 μm, and the length of the first longitudinal groove is equal to the longitudinal length of the substrate; the width of the transverse grooves is 20-60 mu m, the depth of the transverse grooves is 20-240 mu m, the interval of the transverse grooves is 80-150 mu m, and the length of the transverse grooves is equal to the transverse length of the base material.
5. The butt resistance welding preparation method of the high-entropy alloy coating according to claim 3, wherein the alloy powder comprises: high-entropy alloy powder (50%) and base material powder (50%), wherein the particle size of the base material powder is 3-20 micrometers, and the filling height of the alloy powder is 1/3 of the depth of the first longitudinal groove.
6. The method for preparing the high-entropy alloy coating by resistance butt welding according to claim 1, wherein the melting point of the base material is lower than that of the high-entropy alloy sheet, so that the base material is melted to wrap the micro-melted high-entropy alloy sheet in the process of resistance butt welding.
7. The resistance butt welding preparation method of the high-entropy alloy coating according to claim 1, wherein the welding current of the direct current resistance butt welding is 100-1000A, the alloy powder in the groove is firstly melted by gradually adjusting the current, then the base material is melted, finally the high-entropy alloy sheet is in a micro-melting state, 1-50N of upsetting pressure is applied in the direct current resistance butt welding process, the upsetting pressure is lower when the alloy powder is melted, and the duration of the direct current resistance butt welding is 3-20ms as the base material and the high-entropy alloy sheet are gradually melted and the upsetting pressure is increased.
8. The resistance butt welding preparation method of the high-entropy alloy coating according to claim 1, wherein liquid nitrogen is continuously sprayed on the high-entropy alloy sheet and the base material in a direct-current resistance butt welding process, and a welding part is forcibly cooled, so that thermal stress is reduced, and thermal deformation when the base material is combined with the high-entropy alloy sheet is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010611562.5A CN111604652A (en) | 2020-06-30 | 2020-06-30 | Resistance butt welding preparation method of high-entropy alloy coating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355625A (en) * | 2021-06-04 | 2021-09-07 | 福建工程学院 | NbC-reinforced high-entropy alloy-based composite coating and preparation method thereof |
| CN113798512A (en) * | 2021-09-03 | 2021-12-17 | 南京工业大学 | Net forming method and application of interface reinforced Ti-Ni-based gradient material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355625A (en) * | 2021-06-04 | 2021-09-07 | 福建工程学院 | NbC-reinforced high-entropy alloy-based composite coating and preparation method thereof |
| CN113798512A (en) * | 2021-09-03 | 2021-12-17 | 南京工业大学 | Net forming method and application of interface reinforced Ti-Ni-based gradient material |
| CN113798512B (en) * | 2021-09-03 | 2022-04-26 | 南京工业大学 | Net forming method and application of interface reinforced Ti-Ni-based gradient material |
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