CN117385351A - Cr coating on surface of gun steel and preparation method thereof - Google Patents
Cr coating on surface of gun steel and preparation method thereof Download PDFInfo
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- CN117385351A CN117385351A CN202311639617.3A CN202311639617A CN117385351A CN 117385351 A CN117385351 A CN 117385351A CN 202311639617 A CN202311639617 A CN 202311639617A CN 117385351 A CN117385351 A CN 117385351A
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- 238000000576 coating method Methods 0.000 title claims abstract description 73
- 239000011248 coating agent Substances 0.000 title claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 58
- 238000004372 laser cladding Methods 0.000 claims abstract description 41
- 239000011159 matrix material Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000005253 cladding Methods 0.000 claims abstract description 11
- 239000006104 solid solution Substances 0.000 claims abstract description 7
- 229910019589 Cr—Fe Inorganic materials 0.000 claims abstract description 6
- 238000005728 strengthening Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 abstract description 8
- 230000004048 modification Effects 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 239000012466 permeate Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 15
- 238000005299 abrasion Methods 0.000 description 11
- 239000010410 layer Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000758 substrate Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000009713 electroplating Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 231100000241 scar Toxicity 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 238000010952 in-situ formation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005542 laser surface treatment Methods 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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- 238000004901 spalling Methods 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention provides a Cr coating on the surface of gun steel and a preparation method thereof, and relates to the technical field of surface modification of metal materials. The invention uses pure Cr powder as cladding powder, adopts a laser cladding coaxial powder feeding method to carry out laser cladding on gun steel, wherein the laser cladding coaxial powder feeding method utilizes a laser beam channel and an alloy powder channel of a coaxial powder feeding nozzle to synchronously carry out coating cladding at the same time, the powder and gun steel matrix are melted, and Cr is synthesized by utilizing in-situ reaction and atomic diffusion in a molten pool 2 O 3 A reinforcing phase, which makes the coating layer have wear resistance stable from room temperature to 600 ℃; meanwhile, as Fe in the matrix permeates and forms a solid solution phase Cr-Fe with Cr, the toughness of the matrix is increased, the crack tendency is reduced, and the coating is more compact; and because the laser energy density is high, the laser energy density and the matrix are metallurgically combined, and the combination strength is high. In addition, the invention has the advantages of environmental protection, high efficiency, simple equipment and stable quality, and can realize better economic benefit.
Description
Technical Field
The invention relates to the technical field of metal material surface modification, in particular to a Cr coating on the surface of gun steel and a preparation method thereof.
Background
In recent years, with the improvement of gun firing range, power and precision, high-temperature wear of barrels has become a key problem which is urgent to solve in the development of artillery. The research of prolonging the service life of the gun is mainly conducted from the aspects of gun structural design, gunpowder proportioning, barrel inner wall surface modification and the like. Compared with the barrel inner bore structure design and gunpowder proportioning design, the barrel inner wall surface modification is a means for saving more energy, protecting environment and prolonging service life.
The technology for modifying the surface of the inner wall of the barrel at home and abroad mainly comprises the following steps: arc ion plating, thermal spray techniques, explosion spraying, plasma spraying, chemical/physical vapor deposition, magnetron sputtering, electric spark deposition techniques, laser surface strengthening, electroplating, and the like. Currently, the plating of Cr layers is the most widely used and most sophisticated method of surface modification of artillery barrels. However, when the electroplated Cr layer system is applied to a gun steel matrix, the phenomenon of serious mismatch of thermal expansion coefficients exists, the binding force between a coating and the gun steel matrix is poor, microcracks are easy to generate, and peeling is easy to generate after a certain amount of shots are launched; at the same time, harmful Cr is generated in the electroplating process 6+ Ions, which are difficult to handle, cause great pollution to the environment.
Disclosure of Invention
In view of the above, the invention aims to provide a Cr coating on the surface of gun steel and a preparation method thereof. The Cr coating prepared on the surface of the gun steel has stable wear resistance from room temperature to 600 ℃, has high bonding strength with the gun steel matrix, and is favorable for eliminating the stress of the coating and preventing crack growth; and is environment-friendly.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a Cr coating on the surface of steel, which comprises the following steps:
taking pure Cr powder as cladding powder, and carrying out laser cladding on the surface of the gun steel to obtain a pure Cr coating; the laser cladding is coaxial powder feeding laser cladding.
Preferably, the purity of the pure Cr powder is not less than 99.99wt%.
Preferably, the pure Cr powder is spherical powder with the particle size of 100-200 meshes.
Preferably, the powder feeding speed of the laser cladding is 15-21 g/min, and the powder carrying air flow is 7-15 mL/min.
Preferably, the laser power of the laser cladding is 1.6-1.8 kW, the scanning speed is 400-600 mm/min, and the spot diameter is 2-5 mm.
Preferably, the laser power of the laser cladding is 1.6kW, the scanning speed is 600mm/min, and the spot diameter is 3mm.
Preferably, the laser cladding adopts a plurality of lap joints, and the lap joint rate is 30-45%.
Preferably, the overlap ratio is 35%.
Preferably, the thickness of the Cr coating is 500-800 μm.
The invention provides a Cr coating on the surface of the gun steel, which is prepared by the preparation method, wherein the Cr coating comprises a matrix phase and a strengthening phase which are mutually doped, the matrix phase is a Cr-Fe solid solution phase, and the strengthening phase comprises Cr 2 O 3 。
The invention provides a preparation method of Cr coating on steel surface, the invention takes pure Cr powder as cladding powder, adopts a method of laser cladding coaxial powder feeding to carry out laser cladding on gun steel, the laser cladding coaxial powder feeding utilizes a laser beam channel and an alloy powder channel of a coaxial powder feeding nozzle to synchronously carry out coating cladding at the same time, both powder and gun steel matrix are melted, atoms in a molten pool are diffused again,and then in situ formation reaction occurs in the molten pool to form reinforcement in situ. The invention synthesizes Cr by utilizing in-situ reaction and atomic diffusion in a molten pool 2 O 3 Reinforcing phase, in situ generated Cr 2 O 3 Uniformly distributed in Cr coating and in-situ generated Cr 2 O 3 The hard phase ensures that the coating has stable wear resistance from room temperature to 600 ℃, and the wear resistance is more outstanding compared with that of electroplated Cr; meanwhile, due to the penetration of Fe in the gun steel matrix, cr-Fe in a solid solution phase is formed with Cr, so that the toughness of the matrix is increased, the crack tendency is reduced, and the coating is more compact; and because of the higher energy density of the laser, the coating and the matrix are metallurgically bonded, and the interface bonding strength is high, the stress of the coating is eliminated, and crack growth is prevented. In addition, the Cr coating is prepared by utilizing laser cladding, so that the method is clean, environment-friendly, efficient, simple in equipment, stable in quality and capable of realizing better economic benefit.
Drawings
FIG. 1 is an XRD pattern of a Cr composite coating after laser cladding treatment of example 1;
FIG. 2 is a microstructure topography of the Cr composite coating of example 1;
FIG. 3 is the wear scar profile of the Cr composite coating of example 1 at various temperatures;
FIG. 4 shows the wear scar profile of a plated Cr layer formed on the surface of a gun steel by electroplating at different temperatures;
FIG. 5 is an EDS line scan of the Cr composite coating of example 1, and FIG. 5 a is a cross-sectional morphology of the Cr composite coating; b is the EDS line scanning result along the arrow path direction in a;
FIG. 6 is a hardness test result of the Cr coated workpiece prepared in example 1;
fig. 7 is a cross-sectional profile of the coating of example 1 and comparative examples 1 to 2, and fig. 7 (a), (b) and (c) correspond to example 1, comparative example 1 and comparative example 2 in this order.
Detailed Description
The invention provides a preparation method of a Cr coating on the surface of steel, which comprises the following steps:
taking pure Cr powder as cladding powder, and carrying out laser cladding on the surface of the gun steel to obtain a Cr coating; the laser cladding is coaxial powder feeding laser cladding.
The specific materials of the gun steel are not particularly required, and the gun steel known by the person skilled in the art, such as PCrNi3MoVQ, can be adopted. The invention preferably provides for the surface cleaning and preheating of the gun steel in sequence prior to laser cladding. In the present invention, the cleaning method is preferably: performing sand blasting treatment on the gun steel to remove an oxide layer on the surface of the gun steel plate, cleaning the surface of the gun steel plate by using absolute ethyl alcohol, and drying to remove greasy dirt and residual sand particles; the temperature of the preheating is preferably 300 to 400 ℃, more preferably 350 ℃, the time of the preheating is preferably 1 to 3 hours, more preferably 2 hours, and the preheating is preferably performed in a muffle furnace. According to the invention, through preheating, the metal structure and physical properties are changed, the residual stress and temperature gradient are reduced, and the toughness and ductility of the metal are improved, so that the risk of crack formation in the cladding process is effectively reduced, and the quality and reliability of the cladding layer are ensured.
In the present invention, the purity of the pure Cr powder is preferably not less than 99.99wt%, and the pure Cr powder is preferably spherical powder having a particle size of 100 to 200 mesh. The pure Cr powder is preferably dried, preferably at a temperature of 70 to 110 c, more preferably 80 to 100 c, for a time of 20 to 60min, more preferably 50 to 60min, and preferably in an oven, before laser cladding. And drying to obtain cladding powder meeting the laser cladding fluidity.
In the invention, the powder feeding speed of the laser cladding is preferably 15-21 g/min, the powder carrying air flow is preferably 7-15 mL/min, the powder carrying air is preferably high-purity Ar gas, and the purity of the high-purity Ar gas is preferably 99.99wt%.
In the present invention, the laser power of the laser cladding is preferably 1.6 to 1.8kW, more preferably 1.6kW; the scanning speed is preferably 400-600 mm/min, more preferably 600mm/min; the spot diameter is preferably 2 to 5mm, more preferably 3mm; in the present invention, the laser cladding preferably adopts a plurality of lap joints, and the lap joint rate is preferably 30-45%, more preferably 35%.
The specific operation method of the laser cladding is not particularly required, the operation method well known to the skilled person is adopted, specifically, pure Cr powder is filled into a powder barrel with coaxial powder feeding, powder is fed through a powder feeding mechanism, a gun steel plate is placed on a workbench, and coaxial powder feeding and laser cladding is carried out under the laser cladding parameters; in the embodiment of the invention, the powder feeding disc of the powder feeding mechanism is based on a rotary metering disc with a groove.
When pure Cr is coated, the linear expansion coefficients of the gun steel plates are different, and in the coating process, a larger temperature gradient exists when the coating layer is solidified, so that the coating layer is larger in stress after solidification, cracks are easy to generate, the performance of the coating layer is reduced, the coating layer is dropped and the like.
In the present invention, the thickness of the coating layer formed by the laser cladding is preferably 500 to 800. Mu.m. After the laser cladding is finished, the surface of the obtained coating is polished to be smooth, and the thickness of the polished Cr coating is preferably 400-700 mu m.
The gun steel plate is medium-high carbon low alloy steel, the carbon content of the gun steel plate is generally about 0.2-0.3%, and carbon and strong carbon compound forming elements Mo and V are combined to form alloy carbide for second-phase strengthening so as to ensure good toughness matching; the gun steel plate has about 3% of Ni and about 1% of Cr to obtain high hardenability and low-temperature toughness; after final quenching and tempering, the room temperature strength sigma 0.1 of the gun steel is 1104-1172 MPa, but the strength is severely reduced at high temperature, so that the inner wall layer of the barrel is softened, the positive line is deformed and ablated, and serious problems such as spalling occur. The invention can effectively solve the technical problems of poor binding force between the electroplated Cr coating and the substrate, large layer brittleness, more cracks, poor adhesive force and serious environmental pollution.
The invention provides the gun steel prepared by the preparation methodA surface Cr coating, wherein the Cr coating comprises a mutually doped matrix phase and a strengthening phase, the matrix phase is a Cr-Fe solid solution phase, and the strengthening phase comprises Cr 2 O 3 . In the invention, the Cr coating is a high-performance Cr coating, and is high-temperature resistant and wear-resistant; in situ formation of Cr in the coating 2 O 3 The hard phase of the composite coating layer ensures that the composite coating layer has stable wear resistance from room temperature to 600 ℃, and the wear resistance is more outstanding compared with the Cr plating layer (the Cr plating layer lacks Cr at room temperature) 2 O 3 The abrasion loss is large); meanwhile, in the composite coating, as Fe in the matrix permeates and forms Cr-Fe in a solid solution phase with Cr, the toughness of the matrix is increased, the crack tendency is reduced, the coating is more compact, the performance problem of the electroplated Cr coating can be effectively solved, and the performance is better.
For further explanation of the present invention, the present invention provides a gun steel surface Cr coating and a method for preparing the same, which are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Selecting a prepared 10 multiplied by 100 multiplied by 150mm gun steel sample, firstly carrying out sand blasting treatment on the plate to remove an oxide layer on the surface of the plate, then washing the surface of the plate with absolute ethyl alcohol, and drying the surface of a workpiece to remove greasy dirt and residual sand particles. And placing the plate with the cleaned surface in a muffle furnace for preheating to 350 ℃ for 2 hours. The cladding powder pure Cr powder (purity 99.99wt%, spherical powder of 100-200 meshes) is put into a drying box for drying at 80 ℃ for 30min.
And (5) placing the dried powder into a powder barrel. And placing the preheated plate on a fixture with a heat insulation plate. Starting a laser cladding system, wherein the technological parameters of laser surface treatment are as follows: the laser power is 1.6kW, the scanning speed is 600mm/min, the spot diameter is 3mm, the overlapping is performed in a plurality of channels, and the overlapping rate is 35%; the technological parameters of the powder feeding device are as follows: the powder feeding speed is 21g/min, the powder carrying air flow is 7mL/min, and the powder carrying air is 99.99% high-purity Ar gas.
And taking out the workpiece (the coating thickness is 700 mu m) after laser cladding, and polishing the workpiece to be flat to obtain the workpiece clad with the Cr coating (the coating thickness is 550 mu m).
FIG. 1 is an XRD pattern of a Cr composite coating after laser cladding treatment of this example, showing the results of phase analysis of the coating of this example, and determining that the Cr coating of this example is a Cr-Fe solid solution phase (mainly composed of Cr element) and CrO 3 、Cr 2 O 3 A second phase composition.
FIG. 2 is a microstructure morphology of the Cr composite coating in this example. As can be seen from FIG. 2, the Cr coating has a dense structure and fine grains, and Cr oxides are uniformly distributed inside the grains.
FIG. 3 shows the abrasion mark profile at different temperatures and RT abrasion mark depth at room temperature of the Cr composite coating in this example: 13.202 μm; grinding mark depth at 200 ℃): 20.625 μm;400 ℃ grinding mark depth: 18.814 μm;600 ℃ grinding mark depth: 17.377 μm. The composite coating prepared by laser cladding has compact structure, strong binding force between the coating and the matrix, high hardness of the coating, stable friction and wear performance at different temperatures, and basically no change in wear morphology from room temperature to 600 ℃. FIG. 4 shows the wear scar profile at various temperatures of a Cr-plated layer (65 μm thick) formed on the surface of a gun steel by electroplating. As can be seen from FIG. 4, the maximum abrasion mark depth reaches 40.1239 μm at room temperature, the abrasion depth of the electroplated Cr coating gradually decreases (the abrasion mark depth of 200 ℃ is 26.025 μm, the abrasion mark depth of 400 ℃ is 9.4483 μm, and the abrasion mark depth of 600 ℃ is 9.6278 μm) along with the increase of the abrasion temperature, but the abrasion difference of the electroplated Cr at room temperature to high temperature is larger, and the stable friction and abrasion effect in a wide temperature range cannot be ensured.
FIG. 5 is an EDS line scan of the Cr composite coating of the present example, and FIG. 5 a is a cross-sectional morphology of the Cr composite coating; b is the EDS line scan result along the direction of the arrow path in a. As can be seen from fig. 5, the substrate element Fe permeates into the coating, the Cr coating and the substrate are metallurgically reacted to cause element diffusion to realize metallurgical bonding, the mechanical bonding force is better than that of the electroplated Cr, and the Cr and Fe elements are relatively uniformly distributed from the surface of the coating to the substrate.
FIG. 6 is a graph showing the hardness test results of a gun steel sheet workpiece substrate and a Cr-coated workpiece prepared in example 1. As can be seen from fig. 6, the hardness (HV 0.2 ) About 243HV, in example 1 withThe average hardness of the workpiece with the Cr coating can reach about 514HV, and is improved by 2.1 times compared with a gun steel substrate.
Comparative example 1
The laser power was 1.5kW, the scanning speed was 900mm/min, the spot diameter was 3mm, the multi-pass lap joint was 35%, and the remainder was the same as in example 1.
Comparative example 2
The laser power was 1.5kW, the scanning speed was 1200mm/min, the spot diameter was 3mm, the multi-pass lap joint was 35%, and the rest was the same as in example 1.
Fig. 7 is a cross-sectional profile of the coating of example 1 and comparative examples 1 to 2, and fig. 7 (a), (b) and (c) correspond to example 1, comparative example 1 and comparative example 2 in this order. As can be seen from FIG. 7, example 1 was well formed, no defects such as pinholes, cracks, etc. occurred, and the hardening depth of the Cr coating could reach 500 μm to 800 μm; comparative example 1 was not completely formed and microcracks were present; comparative example 2 has a large dilution ratio and the coating height does not meet the forming requirements.
The test results show that the treatment method for preparing the Cr composite coating by laser cladding can improve the microhardness, strength and wear resistance of the gun steel plate, and the hardening depth of the Cr coating can reach 500-800 mu m, and the structure is uniform and compact. In addition, the surface treatment process has the advantages of convenient operation, simple equipment, economy, practicality, reliable technology, high efficiency and stable quality, and can realize better economic benefit.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The preparation method of the Cr coating on the surface of the gun steel is characterized by comprising the following steps of:
taking pure Cr powder as cladding powder, and carrying out laser cladding on the surface of the gun steel to obtain a Cr coating; the laser cladding is coaxial powder feeding laser cladding.
2. The method according to claim 1, wherein the pure Cr powder has a purity of 99.99 wt.% or more.
3. The method according to claim 1 or 2, wherein the pure Cr powder is spherical powder having a particle size of 100 to 200 mesh.
4. The preparation method according to claim 1, wherein the powder feeding speed of the laser cladding is 15-21 g/min, and the powder carrying air flow is 7-15 mL/min.
5. The preparation method according to claim 1, wherein the laser cladding has a laser power of 1.6-1.8 kW, a scanning speed of 400-600 mm/min and a spot diameter of 2-5 mm.
6. The method according to claim 5, wherein the laser cladding has a laser power of 1.6kW, a scanning speed of 600mm/min and a spot diameter of 3mm.
7. The method of claim 1, 5 or 6, wherein the laser cladding is performed in a plurality of passes, and the rate of passes is 30-45%.
8. The method of claim 7, wherein the overlap ratio is 35%.
9. The method according to claim 1, wherein the Cr coating has a thickness of 500 to 800 μm.
10. The Cr coating on the surface of the gun steel prepared by the preparation method of any one of claims 1 to 9, wherein the Cr coating comprises a matrix phase and a strengthening phase which are mutually doped, the matrix phase is a Cr-Fe solid solution phase, and the strengthening phase comprises Cr 2 O 3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311639617.3A CN117385351A (en) | 2023-12-04 | 2023-12-04 | Cr coating on surface of gun steel and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311639617.3A CN117385351A (en) | 2023-12-04 | 2023-12-04 | Cr coating on surface of gun steel and preparation method thereof |
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| CN117385351A true CN117385351A (en) | 2024-01-12 |
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| CN202311639617.3A Pending CN117385351A (en) | 2023-12-04 | 2023-12-04 | Cr coating on surface of gun steel and preparation method thereof |
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- 2023-12-04 CN CN202311639617.3A patent/CN117385351A/en active Pending
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