CN113151824A - Cellular and columnar combined structure coating used in marine environment and preparation method thereof - Google Patents
Cellular and columnar combined structure coating used in marine environment and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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Abstract
The invention discloses a cellular and columnar combined structure coating used in marine environment and a preparation method thereof, wherein a first layer of alloy powder is cladded on a pretreated substrate by utilizing laser beam swing, and a rapid vertical dendritic crystal is changed into a cellular crystal, so that the bonding force of a cladding layer and the substrate is improved, a liquid corrosion medium is prevented from being transmitted towards the substrate, and the corrosion resistance is improved; and then, rapidly cladding a second layer of alloy powder on the obtained cellular crystal cladding layer by utilizing laser beams to form a surface alloy layer without swinging, and obtaining a fine dendritic crystal structure with a columnar structure on the basis of the cellular crystal. The invention not only reduces the manufacturing cost of the material suitable for marine environment, but also improves the wear resistance and corrosion resistance of the material.
Description
Technical Field
The invention relates to a wear-resistant and corrosion-resistant coating in a marine environment and a preparation method thereof, in particular to a cellular and columnar combined structure, and belongs to the field of surface treatment of metal materials. Specifically, the method and the device for efficiently obtaining the high-entropy alloy coating with the cellular and columnar combined structure by utilizing laser cladding synchronously improve the wear resistance and the corrosion resistance, are used for surface strengthening of key parts in the fields of marine hydraulic valve bodies, platform columns, stern shafts, polar icebreaker ships, petroleum, chemical engineering and the like, and improve the wear resistance by 2-5 times.
Background
In the marine resource development and marine engineering, a large number of key parts work in a complex and severe abrasion and corrosion environment, and because the protective coating material and the performance of the surface of the workpiece are not satisfactory, the service life is greatly shortened, thereby not only bringing about potential safety hazards, but also becoming the wearing part with the largest consumption.
The currently common ways of obtaining coatings on surfaces mainly include: electroplating, coating, laser and plasma cladding, bimetal composite casting or imbedding, metal-polymer and the like, wherein different coatings are prepared on different metal material substrates.
Chinese patent publication No. CN110616424A discloses a method for preparing a corrosion-resistant and wear-resistant aluminum-based amorphous composite coating by using a cold spraying technique, and a method for preparing a corrosion-resistant and wear-resistant aluminum-based amorphous composite coating, wherein the prepared aluminum-based amorphous composite coating has high hardness, good corrosion resistance and greatly improved wear resistance, and is an ideal choice for corrosion-resistant and wear-resistant protection of the surfaces of aluminum alloys and magnesium alloys.
The Chinese patent publication No. CN110423540A discloses a preparation process of an anti-wear and anti-corrosion coating for an automobile chassis, the anti-wear and anti-corrosion coating for the automobile chassis prepared by the invention has greatly improved anti-wear and anti-corrosion performance compared with the traditional chassis coating, and reduces the probability of chassis damage caused by stone impact or perennial corrosion, thereby ensuring the service life of the automobile chassis.
Chinese patent publication No. CN110438421A discloses an aluminum alloy material and a method for synchronously strengthening a solid solution treatment and a PVD coating of an aluminum alloy.
Chinese patent publication No. CN110438489A discloses a method for preparing a continuous casting crystallizer copper material surface coating, firstly, nickel powder is bonded to the surface of a crystallizer copper material by adopting asphalt, a Ni-based bonding layer is prefabricated by laser cladding, then a base material is preheated, cobalt powder and zirconium powder enter the bonding layer through a synchronous powder feeding method for laser cladding, and a Ni-Co-Cr composite coating with good tissue and metallurgical compact combination is prepared, so that the hardness can be changed in a step manner, the abrasion loss of the copper base material is about 6.5 times of that of a Co base layer, and the Ni-Co-Cr composite layer is very wear-resistant, thereby greatly improving the abrasion performance of the copper base material, effectively lightening the abrasion and reducing the deformation; the zirconium-based powder has the advantages of small heat conductivity, good chemical stability, high corrosion resistance, high hardness and good wear resistance, and under the induction action of an external force, the tetragonal phase (t-ZrO2) is likely to generate martensite phase transformation to a monoclinic phase (m-ZrO2) and is accompanied with volume expansion, so that part of energy is dissipated, and part of the external force is counteracted to play a toughening role.
The wear-resistant and corrosion-resistant performance under different environments can be improved by adopting the different coating preparation methods, but a method for obtaining a strong metallurgical bonding coating with wear-resistant and corrosion-resistant performance through material organization and structure design and process implementation aiming at the performance requirements of mutual contradiction of wear and corrosion under the marine environment has not been reported yet.
2018113868472 an anticorrosion and antiwear coating with laminated and cylindrical composite structure is prepared through plasma spraying and plasma fusing, and features that the gradient structure of laminated and cylindrical layers with continuously varying properties in thickness direction is obtained. The technology can improve the impact resistance and the corrosion resistance of the coating material, but if a super-thick coating with strong metallurgical bonding is obtained, the plasma spraying and the plasma melting are alternately repeated, so that the technology is high in cost and difficult to operate.
Chinese patent application publication No. CN106825930A a device for remanufacturing a railway train wheel by laser arc welding composite cladding, which provides a device structure combining broadband laser and swing arc welding, and effectively solves the defects that the laser manufacturing cost is too high and the arc welding quality cannot be ensured. This patent adopts two kinds of techniques, and the operation is complicated, and is time-consuming, the inefficiency.
Disclosure of Invention
In order to reduce the manufacturing cost of the material suitable for the marine environment and improve the wear resistance and corrosion resistance of the material, the invention obtains the high-entropy alloy coating with the cellular and columnar composite structure by designing a cladding process and a high-entropy alloy element combination and adopting a laser cladding method and by layered swing cladding, thereby providing the coating for the marine environment with the cellular and columnar composite structure.
The invention also provides a preparation method of the coating with cellular and columnar combined structure for marine environment
In order to achieve the purpose, the invention adopts the technical scheme that:
a coating with cellular and columnar composite structures for marine environment is characterized in that a first layer of alloy powder is cladded on a pretreated substrate by utilizing laser beam swing, and a fast vertical dendritic crystal is changed into a cellular crystal, so that the bonding force between the cladding layer and the substrate is improved, a liquid corrosion medium is prevented from being transmitted to the substrate, and the corrosion resistance is improved; and then, rapidly cladding a second layer of alloy powder on the obtained cellular crystal cladding layer by utilizing laser beams to form a surface alloy layer without swinging, and obtaining a fine dendritic crystal structure with a columnar structure on the basis of the cellular crystal.
The alloy powder is prepared from Ni, Cr, Mn, Co, Fe, Ti and B4C, etc. with a grain size of 48-75 μ M, wherein the first layer of alloy powder consists of Co, Cr, Fe, Ni and M powder, and the second layer of alloy powder consists of Co, Cr, Fe, Ni, Mn, Ti and B4Group C powderAnd (4) obtaining.
Preferably, the molar ratio of the alloy powder of the first layer is Co: cr: fe: ni: mn is 1: 1: 1: 1: 1; the molar ratio of the alloy powder of the second layer is Co: cr: fe: ni: mn: ti: b is4C＝1：1：1：1：1：x：y(x＝0.25～1,y＝1/3x)。
The preparation method of the coating with cellular and columnar combined structure for marine environment comprises the following steps:
step 1: powder preparation
According to the weight ratio of Co: cr: fe: ni: mn is 1: 1: 1: 1: weighing the first layer of alloy powder according to the molar ratio of 1, and mixing the alloy powder according to the weight ratio of Co: cr: fe: ni: mn: ti: b is4C is 1: 1: 1: 1: 1: x: weighing the second layer of alloy powder according to the molar ratio of y (x is 0.25-1, y is 1/3x), wherein the powder granularity of the powder is 48-75 mu m, and respectively placing the prepared first layer of alloy powder and the prepared second layer of alloy powder into a three-dimensional mixer for mixing for 24 hours;
step 2: pretreatment of substrate surface
Before cladding, cleaning a matrix, polishing and leveling, removing oil stain and rust, and finally drying;
and step 3: laser oscillation cladding first layer cell structure
The laser swing cladding power is 1200W, the scanning speed is 8mm/s, the spot diameter is 3mm, the lap joint rate is 33%, the swing amplitude is 1.5-3.5mm, the swing frequency is 300Hz, the first laser cladding is carried out on the precoated first layer of alloy powder Ni, Cr, Mn, Co and Fe, the first cladding layer has a cellular structure, the thickness is 1.5-2mm, the average hardness is 220-600 HV-0.1The liquid corrosion medium can be prevented from being transmitted to the base body;
and 4, step 4: laser cladding the second layer surface alloy layer to obtain a fine dendritic crystal structure with a columnar structure
Laser cladding power 1500W, scanning speed 10mm/s, spot diameter 3mm, lap-joint rate 33%, no swing, for the second layer of precoated gold powder Ni, Cr, Mn, Co, Fe, Ti, B4C, performing second laser cladding, wherein the second cladding layer has a columnar structure, the thickness is 0.5-1mm, and the average hardness is 740-0.1Show very strong in the wearing processThe anti-adhesion abrasion and abrasive wear resistance of the composite material; and after the cladding is finished, the coating is cooled to room temperature in air, impurities such as slag, oxide skin and the like are removed by using a copper brush, and the cladding process is finished to form a meltallizing layer with a cellular and columnar combined structure.
The advantages of the present invention are illustrated below based on the reaction mechanism
1. The invention adopts a laser cladding method, and obtains the high-entropy alloy coating with cellular and columnar composite structures by layered swing cladding, wherein the average hardness formed by laser swing cladding of Ni, Cr, Mn, Co and Fe powder is 220-600 HV-0.1The first layer of alloy layer has a cellular structure, is mainly a tough and matched FCC phase, has good corrosion resistance, and can prevent liquid corrosive medium from being transmitted to a matrix; laser cladding Ni, Cr, Mn, Co, Fe, Ti, B4C powder without swing has an average hardness of 740 and 950HV0.1The second layer has a columnar structure, is mainly a structure that a small amount of nano-crystalline, fine intermetallic compounds and ceramic phases are added into an FCC matrix, has high hardness, and shows very strong performances of resisting adhesion abrasion and abrasive wear in an abrasion process. Due to the adoption of the layered laser cladding method, the laser cladding technology has high energy density, can realize rapid heating and rapid cooling, has small heat influence on a base material, can improve the solid solution limit of alloy elements in a coating in the rapid heating and rapid cooling process of laser cladding, further enhances the solid solution strengthening effect, can effectively improve the nucleation rate to refine grains, is sometimes accompanied by the precipitation of a small amount of nano-crystals, fine intermetallic compounds and ceramic phases in the non-equilibrium solidification process to generate remarkable fine grain strengthening and certain dispersion strengthening effect, thereby improving the hardness, corrosion resistance, wear resistance and the like of the coating.
2. Compared with other methods for preparing the high-entropy alloy, the method can obtain a layer of high-entropy alloy coating with excellent performance on a cheap substrate material, is simple to operate, greatly saves the cost, and obviously improves the wear resistance and corrosion resistance of a substrate workpiece; compared with the coating obtained by the traditional cladding coating technology, the coating has the advantages of small deformation of the matrix, high efficiency, easy control of thickness and wide selection range of coating materials, can be made of ceramics, metals and composite materials, is used for surface strengthening of key parts in the fields of marine hydraulic valve bodies, platform columns, screw shafts, engine cylinder bodies, petroleum, chemical engineering, mines, petroleum and the like, and can obviously improve the abrasion resistance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of laser cladding of the present invention;
FIG. 2 is a sectional microstructure diagram of the corrosion-resistant and wear-resistant coating of cellular and columnar composite structure according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
In order to define the improvement degree of the wear resistance and corrosion resistance of the coating of the invention, the corrosion-resistant and wear-resistant coating with cellular and columnar composite structure of the invention is prepared on the Q235 steel matrix in the embodiment, and the self-corrosion current of the Q235 steel matrix selected in the embodiment in the sodium chloride solution is detected to be 8.54 muA cm-2. The friction and wear test of the Q235 steel adopts reciprocating linear friction, and the test conditions are as follows: at room temperature, dry friction, the alumina ceramic ball is used as a pair grinding pair, the wear time is 30min, and the wear volume loss is as follows: 1.758X 107μm3For comparability, the self-corrosion current and wear resistance tests in the following examples were carried out under the same test conditions as for Q235 steel.
Example one
Step 1: powder preparation
The raw material of the wear-resistant and corrosion-resistant coating is alloy powder, the alloy powder is selected from metal powder of Ni, Cr, Fe, Co, Mn and the like, and the particle size of the powder is 48-75 mu m.The powder proportion is mole ratio, wherein the proportion of the alloy powder of the first layer is Co: cr: fe: ni: mn is 1: 1: 1: 1: 1, the proportion of the alloy powder of the second layer is Co: cr: fe: ni: mn: ti: b is4C is 1: 1: 1: 1: 1: 0.25: 0.08, placing the prepared metal powder into a three-dimensional mixer to mix for 24 hours.
Step 2: pretreatment of substrate surface
Cleaning the matrix with cleaning powder before carrying out a cladding experiment, then carrying out coarse grinding with an angle grinder, carrying out fine grinding and leveling with sand paper, then putting the matrix into absolute ethyl alcohol for ultrasonic cleaning for 30min, removing oil stains and iron rust on the matrix, and finally drying the matrix in a 60 ℃ drying oven for 2 h.
And step 3: laser cladding first alloy layer
The laser cladding method shown in FIG. 1 is adopted, the laser power is 1200W, the scanning speed is 8mm/s, the spot diameter is 3mm, the lap joint rate is 33%, the swing amplitude is 1.5mm, the swing frequency is 300Hz, and the laser cladding is carried out on the pre-coating powder. The average microhardness of the coating is 350HV0.1The cladding layer had a cell structure and a thickness of 1.5 mm.
And 4, step 4: laser cladding the second layer surface alloy layer shown in figure 2 to obtain a fine dendritic structure with a columnar structure
The laser cladding power is 1500W, the scanning speed is 10mm/s, the spot diameter is 3mm, the lap joint rate is 33 percent, the cladding layer does not swing, the cladding layer has a columnar structure, the thickness is 0.5mm, and the microhardness is 780HV0.1And the coating shows very strong anti-adhesion abrasion and abrasive wear resistance in the abrasion process. The abrasion volume is 0.358 multiplied by 10 after being tested7μm3The wear resistance of the material is improved by almost 4 times; the self-corrosion current is 5.509 multiplied by 10-2μA·cm-2The corrosion resistance is improved by 154 times. The method is used for strengthening the surface of the ocean platform upright post.
After the cladding is finished, the coating is cooled to room temperature in air, impurities such as slag and oxide skin are removed by using a copper brush, and the cladding process is finished to form a cladding layer with a cellular and columnar combined structure shown in figure 2.
Example two
Step 1: powder preparation
The powder ratio is a mole ratio, wherein the ratio of the first layer of alloy powder is Co: cr: ni: mn: fe is 1: 1: 1: 1: 1, the proportion of the alloy powder of the second layer is Co: cr: fe: ni: mn: ti: b is4C is 1: 1: 1: 1: 1: 0.5: 0.16, placing the prepared metal powder into a three-dimensional mixer to mix for 24 hours.
Step 2: pretreatment of substrate surface
Cleaning the matrix with cleaning powder before carrying out a cladding experiment, then carrying out coarse grinding with an angle grinder, carrying out fine grinding and leveling with sand paper, then putting the matrix into absolute ethyl alcohol for ultrasonic cleaning for 30min, removing oil stains and iron rust on the matrix, and finally drying the matrix in a 60 ℃ drying oven for 2 h.
And step 3: laser oscillation cladding first layer alloy layer
The laser cladding method is adopted, the laser power is 1200W, the scanning speed is 8mm/s, the spot diameter is 3mm, the lap joint rate is 33%, the swing amplitude is 2.5mm, the swing frequency is 300Hz, and the laser cladding is carried out on the pre-coating powder. The average microhardness of the coating is 480HV0.1The cladding layer had a cell structure and a thickness of 1.8 mm.
And 4, step 4: laser cladding the second layer surface alloy layer to obtain a fine dendritic crystal structure with a columnar structure
The laser swing cladding power is 1500W, the scanning speed is 10mm/s, the diameter of a light spot is 3mm, the lap joint rate is 33 percent, the laser swing cladding layer does not swing, the cladding layer has a columnar structure, the thickness is 0.7mm, and the microhardness is 850HV0.1And the coating shows very strong anti-adhesion abrasion and abrasive wear resistance in the abrasion process. The abrasion volume is 0.264 multiplied by 10 after being tested7μm3The wear resistance of the material is improved by 5.7 times; the self-corrosion current is 0.899 muA cm-2The corrosion resistance is improved by 8.5 times. The method can be used for strengthening the surface of the engine cylinder block.
Example three:
step 1: powder preparation
The powder ratio is a mole ratio, wherein the ratio of the first layer of alloy powder is Co: cr: ni: mn: fe is 1: 1: 1: 1: 1, the proportion of the alloy powder of the second layer is Co: cr: fe: ni：Mn：Ti：B4C is 1: 1: 1: 1: 1: 1: 0.33, placing the prepared metal powder into a three-dimensional mixer to mix for 24 hours.
Step 2: pretreatment of substrate surface
Cleaning the matrix with cleaning powder before carrying out a cladding experiment, then carrying out coarse grinding with an angle grinder, carrying out fine grinding and leveling with sand paper, then putting the matrix into absolute ethyl alcohol for ultrasonic cleaning for 30min, removing oil stains and iron rust on the matrix, and finally drying the matrix in a 60 ℃ drying oven for 2 h.
And step 3: laser oscillation cladding first layer alloy layer
The laser cladding method is adopted, the laser power is 1200W, the scanning speed is 8mm/s, the spot diameter is 3mm, the lap joint rate is 33%, the swing amplitude is 3.5mm, the swing frequency is 300Hz, and the laser cladding is carried out on the pre-coating powder. The average microhardness of the coating is 560HV0.1The cladding layer had a cell structure and a thickness of 2 mm.
And 4, step 4: and laser cladding the alloy layer on the surface of the second layer to obtain a fine dendritic crystal structure with a columnar structure.
The laser swing cladding power is 1500W, the scanning speed is 10mm/s, the diameter of a light spot is 3mm, the lap joint rate is 33 percent, the laser swing cladding layer does not swing, the cladding layer has a columnar structure, the thickness is 0.6mm, and the microhardness is 920HV0.1And the coating shows very strong anti-adhesion abrasion and abrasive wear resistance in the abrasion process. The abrasion volume is 1.264 multiplied by 10 after being tested6μm3The wear resistance of the material is improved by almost 13 times; the self-corrosion current is 0.106 muA cm-2The corrosion resistance is improved by more than 79 times. The method can be used for surface strengthening of the hydraulic valve body.
The above embodiments are not intended to limit the technical solution of the present invention, the scope of the present invention is defined by the claims, and any modifications made based on the above embodiments are within the scope of the present invention.
Claims (3)
1. A cellular and columnar combined structure coating used in marine environment is characterized in that a first layer of alloy powder is cladded on a pretreated substrate by utilizing laser beam swing, and a fast vertical dendritic crystal is changed into a cellular crystal, so that the bonding force of a cladding layer and the substrate is improved, a liquid corrosion medium is prevented from being transmitted to the substrate, and the corrosion resistance is improved; then, on the obtained cellular crystal cladding layer, rapidly cladding a second layer of alloy powder by utilizing laser beams to form a surface alloy layer without swinging, and obtaining a fine dendritic crystal structure with a columnar structure on the basis of the cellular crystal;
the first layer of alloy powder consists of Co, Cr, Fe, Ni and M powder, and the second layer of alloy powder consists of Co, Cr, Fe, Ni, Mn, Ti and B powder4And C, powder composition.
2. The cellular and columnar composite structure coating used in the marine environment as claimed in claim 1, wherein the molar ratio of the alloy powder of the first layer is Co: cr: fe: ni: mn is 1: 1: 1: 1: 1; the molar ratio of the alloy powder of the second layer is Co: cr: fe: ni: mn: ti: b is4C is 1: 1: 1: 1: 1: x: y, wherein x is 0.25-1, and y is 1/3 x.
3. A preparation method of a coating with cellular and columnar combined structures for marine environment is characterized by comprising the following steps:
step 1: powder preparation
According to the weight ratio of Co: cr: fe: ni: mn is 1: 1: 1: 1: weighing the first layer of alloy powder according to the molar ratio of 1, and mixing the alloy powder according to the weight ratio of Co: cr: fe: ni: mn: ti: b is4C is 1: 1: 1: 1: 1: x: weighing second layer of alloy powder according to the y molar ratio, wherein the powder granularity of the powder is 48-75 mu m, and respectively placing the prepared first layer of alloy powder and the prepared second layer of alloy powder in a three-dimensional mixer for mixing for 24 hours;
the x is 0.25-1, and the y is 1/3 x;
step 2: pretreatment of substrate surface
Before cladding, cleaning a matrix, polishing and leveling, removing oil stain and rust, and finally drying;
and step 3: laser oscillation cladding first layer cell structure
The laser swing cladding power is 1200W, the scanning speed is 8mm/s, the spot diameter is 3mm, the lap joint rate is 33 percent,the swing amplitude is 1.5-3.5mm, the swing frequency is 300Hz, the pre-coated first layer of alloy powder of Ni, Cr, Mn, Co and Fe is subjected to first laser cladding, the first cladding layer has a cellular structure, the thickness is 1.5-2mm, and the average hardness is 220-600HV0.1The liquid corrosion medium can be prevented from being transmitted to the base body;
and 4, step 4: laser cladding the second layer surface alloy layer to obtain a fine dendritic crystal structure with a columnar structure
Laser cladding power 1500W, scanning speed 10mm/s, spot diameter 3mm, lap-joint rate 33%, no swing, for the second layer of precoated gold powder Ni, Cr, Mn, Co, Fe, Ti, B4C, performing second laser cladding, wherein the second cladding layer has a columnar structure, the thickness is 0.5-1mm, and the average hardness is 740-0.1The adhesive wear resistance and abrasive wear resistance are very strong during the wear process; and after the cladding is finished, the coating is cooled to room temperature in air, impurities such as slag, oxide skin and the like are removed by using a copper brush, and the cladding process is finished to form a meltallizing layer with a cellular and columnar combined structure.
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| CN107326221A (en) * | 2017-06-30 | 2017-11-07 | 西南交通大学 | Cladding layer prepared by cobalt-base alloys and its cobalt-base alloys |
| US20200324373A1 (en) * | 2019-04-15 | 2020-10-15 | Baolong Shen | Iron-based amorphous nanocrystalline laser cladding composite coating, preparation method and test method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114632948A (en) * | 2022-03-21 | 2022-06-17 | 中国海洋大学 | Plasma and laser composite additive manufacturing method |
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