CN110076340B - Titanium alloy continuous gradient high-temperature-resistant coating and preparation method thereof - Google Patents

Titanium alloy continuous gradient high-temperature-resistant coating and preparation method thereof Download PDF

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CN110076340B
CN110076340B CN201910408367.XA CN201910408367A CN110076340B CN 110076340 B CN110076340 B CN 110076340B CN 201910408367 A CN201910408367 A CN 201910408367A CN 110076340 B CN110076340 B CN 110076340B
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titanium alloy
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CN110076340A (en
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孙中刚
季霄
陈小龙
张文书
常辉
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Shangi Institute For Advanced Materials Nanjing Co ltd
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    • B22—CASTING; POWDER METALLURGY
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    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/50—Means for feeding of material, e.g. heads
    • B22F12/58—Means for feeding of material, e.g. heads for changing the material composition, e.g. by mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/22—Direct deposition of molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention provides a titanium alloy continuous gradient high-temperature-resistant coating and a preparation method thereof, belonging to the field of additive manufacturing, wherein the physical characteristics of titanium alloy and nickel-based high-temperature alloy are combined, a laser coaxial powder feeding additive manufacturing process is adopted, TC4 titanium alloy powder is melted and deposited to be used as a base material, mixed powder with different component proportions of TC4 and IN625 is selected to be used as an intermediate transition layer, and finally the IN625 alloy powder is melted and deposited to be used as a surface layer, so that the titanium alloy continuous gradient high-temperature-resistant coating is obtained. The invention not only retains the good physical characteristics of the titanium alloy, but also realizes good gradient combination with the IN625 nickel-based superalloy, and avoids the generation of cracks and microcracks caused by the generation of brittle phases IN the manufacturing process.

Description

Titanium alloy continuous gradient high-temperature-resistant coating and preparation method thereof
Technical Field
The invention relates to the field of additive manufacturing, in particular to a titanium alloy continuous gradient high-temperature-resistant coating and a preparation method thereof, and is particularly suitable for preparing a continuous gradient high-temperature-resistant material by laser coaxial powder feeding additive manufacturing.
Background
Titanium and its alloy are important metal materials which are started to be used in the aerospace field in the rise of the 50 th century, have higher specific strength and thermal strength, light weight and good corrosion resistance, and can fully exert the technical advantages of design and manufacture integration. TC4 is an alpha + beta type two-phase titanium alloy, has good comprehensive performance, and is the most widely used titanium alloy. With the increasing requirements of new aerospace craft on the service performance of parts, the preparation technology of titanium alloy material complex structural parts becomes one of the hot spots of manufacturing technology research. The IN625 nickel-based superalloy is a nickel-based superalloy which is subjected to solid solution strengthening mainly through two elements of Mo and Nb, and the main elements of the alloy are nickel, chromium and the like. Among the constituent elements, Ni element and Cr element have strong oxidation resistance and corrosion resistance, Mo element has strong pitting corrosion resistance and slot corrosion resistance, Nb element has the function of stabilizing each element, and Ti element and C element can form TiC ceramic phase carbide.
In recent decades, advances in materials and manufacturing techniques have further expanded the range of applications for superalloys, including turbine blades in aircraft jet engines and gas turbine blades in electrical generators. In some of these applications, only certain regions of the component will be subjected to very high temperature environments, and for this case the component need not be made from a single component alloy, but rather a Functionally Graded Material (FGM) with a gradient of composition is more suitable. This reduces the cost of the material and the final weight of the component. The Functional Gradient Material (FGM) is a novel composite material which is compounded by two or more materials and has continuously gradient-changed components and structures, is a novel functional material which is developed to meet the requirements of high-tech fields such as modern aerospace industry and the like and can repeatedly and normally work under the limit environment. Since by spatially changing the chemical or microstructure the local properties of the component also change, resulting in components with heterogeneity (mechanical, thermal, optical, magnetic, etc.), which cannot generally be obtained using traditional metallurgy. Techniques that have been used to manufacture FGMs with chemical changes include vapor deposition (primarily for functionally graded coatings), ultrasonic welding, fusion welding, layer/disk remelting, powder metallurgy, and centrifugal methods, among others. These methods are suitable for generating gradients of less than 1mm in length. While Additive Manufacturing (AM) is a key technology in functionally graded metallic materials with chemical changes over a large length scale (on the order of tens of millimeters), in laser co-axial powder feed additive manufacturing technology this molten pool is created in the underlying substrate using a laser and a plurality of powder feed pipes deliver powder through nozzles into the molten pool. Thus, laser co-axial powder feed additive manufacturing can produce Functionally Graded Materials (FGM) by varying the relative proportions of multiple powder pipes into the melt pool.
In prior studies, a variety of FGMs have been investigated with alloys of different compositions, including TiC/Ti, TiB2TiB, Ti/TiAl and Fe/FeAl. IN one study, LMD was used to make FGM from AISI type 304L stainless steel to IN625 and investigated for chemical composition, microstructure, microhardness and primary and secondary phases and their compositions. Although the assembly was successfully manufactured without macro-cracks, the authors determined through experimentation and computational analysis that a second phase, i.e., transition metal carbide, formed in the gradient region resulted in micro-cracks. Lin et Al studied graded SS316/Rene88DT, Ti/Rene88DT and Ti6Al4V/Rene88DT alloys manufactured by LRF and analyzed the effect of compositional changes on phase transformation and microstructure evolution. In another study, Ti-6Al-4V to 304L stainless steels FGM, manufactured by LMD, broke during manufacture and were found to form brittle FeTi and Fe-V-Cr epsilon phases when the stainless steels were introduced into forming, resulting in cracking.
Therefore, during the manufacturing process for preparing the gradient functional material, a brittle phase may be generated to cause cracking, or a large internal stress cycle due to heating and cooling, and the generated unwanted metal compound may cause micro-cracks to be generated.
Disclosure of Invention
The invention aims to provide a titanium alloy continuous gradient high-temperature-resistant coating and a preparation method thereof.
IN order to achieve the aim, the invention provides a titanium alloy continuous gradient high-temperature-resistant coating, wherein TC4 titanium alloy powder is fused and deposited to be used as a base material, mixed powder with different component ratios of TC4 and IN625 is selected to be used as an intermediate transition layer, and finally the IN625 alloy powder is fused and deposited to be used as a surface layer, so that the titanium alloy continuous gradient high-temperature-resistant coating is obtained.
A preparation method of a titanium alloy continuous gradient high-temperature-resistant coating comprises the following steps:
step 1, respectively placing TC4 titanium alloy powder with the powder particle size of 100-200 mu m and IN625 nickel-based alloy powder with the powder particle size of 53-150 mu m into a vacuum drier for dehumidification, wherein the vacuum drying and heating temperature of the powder is 100 ℃, and the powder drying time is 2 hours, so as to obtain dry powder;
step 2, performing laser coaxial powder feeding additive manufacturing on TC4 titanium alloy powder, wherein the printing environment is a pure Ar environment, the oxygen content is below 50ppm, and a formed base material is obtained after printing;
the additive manufacturing process parameters are as follows: the laser power of the optical fiber is 1500-1800 w, the scanning speed is 480-600 mm/min, the powder feeding speed is 1.0r/min, the diameter of a laser spot is 3mm, the lap joint rate is 40-50%, and a reciprocating snake-shaped scanning strategy is adopted;
step 3, respectively filling TC4 titanium alloy powder and IN625 alloy powder into a first charging basket and a second charging basket of an air-borne double-barrel powder feeder, adjusting the powder conveying proportion of the two charging baskets of the powder feeder, setting the first charging basket to convey 90 v% of TC4 titanium alloy powder, setting the second charging basket to convey 10 v% of IN625 alloy powder, namely, the IN625 alloy powder IN the conveyed mixed powder accounts for 10% of the volume proportion, and then melting and depositing the conveyed mixed powder on a base material through a laser coaxial powder-feeding additive manufacturing technology to obtain a first transition layer;
step 4, adjusting the powder conveying proportion of the two material barrels of the powder feeder, setting the first material barrel to convey 80 v% of TC4 titanium alloy powder, setting the second material barrel to convey 20 v% of IN625 alloy powder, namely, the IN625 alloy powder IN the conveyed mixed powder accounts for 20% of the volume proportion, and then melting and depositing the conveyed mixed powder on the first transition layer through a laser coaxial powder feeding additive manufacturing technology to obtain a second transition layer;
and 5, carrying out laser coaxial powder feeding additive manufacturing on the IN625 alloy powder, and melting and depositing on the second transition layer to obtain a surface layer, thereby finally obtaining the titanium alloy continuous gradient high-temperature-resistant coating.
Compared with the prior art, the invention has the advantages that: the invention designs a gradient path of a transition layer without brittle phase generation and microcracks, adopts a laser coaxial powder feeding additive manufacturing process, melts and deposits TC4 titanium alloy powder as a base material, selects mixed powder with the volume proportion of IN625 alloy powder being respectively 10% and 20% as an intermediate gradient transition layer, and finally melts and deposits the IN625 alloy powder as a surface high temperature resistant coating to prepare the titanium alloy continuous gradient high temperature resistant coating with compact structure and without cracks, holes and other defects. The invention not only retains the good physical characteristics of the titanium alloy, but also realizes good gradient combination with the IN625 alloy, and avoids the generation of cracks and microcracks caused by the generation of brittle phases IN the manufacturing process.
Drawings
FIGS. 1a-1b are schematic structural diagrams of the titanium alloy continuous gradient refractory coating prepared by the invention, wherein 1a is a planar structure and 1b is a three-dimensional structure.
FIG. 2 is a macroscopic structural morphology diagram of the titanium alloy continuous gradient high temperature resistant coating prepared by the invention.
FIG. 3 is a hardness distribution diagram of the titanium alloy continuous gradient high temperature resistant coating prepared by the invention along the gradient direction.
Detailed Description
In order to better understand the technical content of the present invention, the technical solutions of the present invention are described in detail below with reference to the embodiments and the accompanying drawings.
Example 1
With reference to fig. 1, the invention provides a method for preparing a titanium alloy continuous gradient high temperature resistant coating, which utilizes a laser coaxial powder feeding additive manufacturing process and comprises the following steps:
(1) respectively placing TC4 titanium alloy powder with the powder particle size of 100-200 mu m and IN625 alloy powder with the powder particle size of 53-150 mu m into a vacuum drier for dehumidification, wherein the powder is dried IN vacuum at the heating temperature of 100 ℃ for 2 hours to obtain dry powder;
(2) the TC4 titanium alloy powder is used for laser coaxial powder feeding additive manufacturing, the printing environment is a pure Ar environment, the oxygen content reaches below 50ppm, 5 layers are deposited by laser melting, and a formed base material is obtained after printing;
the additive manufacturing process parameters are as follows: the laser power of the optical fiber is 1800w, the scanning speed is 480mm/min, the powder feeding speed is 1.0r/min, the diameter of a laser spot is 3mm, the lap joint rate is 50%, the layer thickness is 0.8mm, and a reciprocating snake-shaped scanning strategy is adopted;
(3) respectively loading TC4 powder and IN625 powder into a left barrel and a right barrel of an air-borne double-barrel powder feeder, adjusting the powder conveying ratio of the left barrel and the right barrel of the powder feeder, conveying 90% of TC4 powder to the left barrel, conveying 10% of IN625 powder to the right barrel, namely conveying the IN625 powder accounting for 10% (volume ratio) of the powder, and then melting and depositing a layer of the mixed powder of the conveyed TC4 and the 10% of IN625 powder on a previously printed TC4 base material by a laser coaxial powder feeding additive manufacturing technology;
(4) adjusting the powder conveying ratio of a left barrel and a right barrel of a powder feeder, conveying 80% of TC4 powder to the left barrel, conveying 20% of IN625 powder to the right barrel, namely conveying the IN625 powder accounting for 20% (volume ratio) of the powder, and then melting and depositing a layer of the mixed powder of TC4+ 20% IN625 conveyed on a previously printed TC4+ 10% IN625 transition layer by a laser coaxial powder feeding additive manufacturing technology;
(5) the IN625 nickel-based alloy powder is used for laser coaxial powder feeding additive manufacturing, 5 layers are fused and deposited on a previously printed TC4+ 20% IN625 transition layer, and the titanium alloy continuous gradient high-temperature resistant coating is obtained.
Example 2
(1) Respectively placing TC4 titanium alloy powder with the powder particle size of 100-200 mu m and IN625 alloy powder with the powder particle size of 53-150 mu m into a vacuum drier for dehumidification, wherein the powder is dried IN vacuum at the heating temperature of 100 ℃ for 2 hours to obtain dry powder;
(2) the TC4 titanium alloy powder is used for laser coaxial powder feeding additive manufacturing, the printing environment is a pure Ar environment, the oxygen content reaches below 50ppm, 5 layers are deposited by laser melting, and a formed base material is obtained after printing;
the additive manufacturing process parameters are as follows: the laser power of the optical fiber is 1800w, the scanning speed is 600mm/min, the powder feeding speed is 1.0r/min, the diameter of a laser spot is 3mm, the lap joint rate is 50%, and the layer thickness is 0.7mm by adopting a reciprocating snake-shaped scanning strategy;
(3) respectively loading TC4 powder and IN625 powder into a left barrel and a right barrel of an air-borne double-barrel powder feeder, adjusting the powder conveying ratio of the left barrel and the right barrel of the powder feeder, conveying 90% of TC4 powder to the left barrel, conveying 10% of IN625 powder to the right barrel, namely conveying the IN625 powder accounting for 10% (volume ratio) of the powder, and then melting and depositing a layer of the mixed powder of the conveyed TC4 and the 10% of IN625 powder on a previously printed TC4 base material by a laser coaxial powder feeding additive manufacturing technology;
(4) adjusting the powder conveying ratio of a left barrel and a right barrel of a powder feeder, conveying 80% of TC4 powder to the left barrel, conveying 20% of IN625 powder to the right barrel, namely conveying the IN625 powder accounting for 20% (volume ratio) of the powder, and then melting and depositing a layer of the mixed powder of TC4+ 20% IN625 conveyed on a previously printed TC4+ 10% IN625 transition layer by a laser coaxial powder feeding additive manufacturing technology;
(5) the IN625 nickel-based alloy powder is used for laser coaxial powder feeding additive manufacturing, and 2 layers are fused and deposited on a previously printed TC4+ 20% IN625 transition layer to obtain the titanium alloy continuous gradient high-temperature-resistant coating.
Example 3
(1) Respectively placing TC4 titanium alloy powder with the powder particle size of 100-200 mu m and IN625 alloy powder with the powder particle size of 53-150 mu m into a vacuum drier for dehumidification, wherein the powder is dried IN vacuum at the heating temperature of 100 ℃ for 2 hours to obtain dry powder;
(2) the TC4 titanium alloy powder is used for laser coaxial powder feeding additive manufacturing, the printing environment is a pure Ar environment, the oxygen content reaches below 50ppm, 10 layers are deposited by laser melting, and a formed base material is obtained after printing;
the additive manufacturing process parameters are as follows: the laser power of the optical fiber is 1500-1800 w, the scanning speed is 600mm/min, the powder feeding speed is 1.0r/min, the diameter of a laser spot is 3mm, the lap joint rate is 50%, the thickness of the layer is 0.7mm, and a reciprocating snake-shaped scanning strategy is adopted;
(3) respectively loading TC4 powder and IN625 powder into a left barrel and a right barrel of an air-borne double-barrel powder feeder, adjusting the powder conveying ratio of the left barrel and the right barrel of the powder feeder, conveying 90% of TC4 powder to the left barrel, conveying 10% of IN625 powder to the right barrel, namely conveying the IN625 powder accounting for 10% (volume ratio) of the powder, and then melting and depositing a layer of the mixed powder of the conveyed TC4 and the 10% of IN625 powder on a previously printed TC4 base material by a laser coaxial powder feeding additive manufacturing technology;
(4) adjusting the powder conveying ratio of a left barrel and a right barrel of a powder feeder, conveying 80% of TC4 powder to the left barrel, conveying 20% of IN625 powder to the right barrel, namely conveying the IN625 powder accounting for 20% (volume ratio) of the powder, and then melting and depositing a layer of the mixed powder of TC4+ 20% IN625 conveyed on a previously printed TC4+ 10% IN625 transition layer by a laser coaxial powder feeding additive manufacturing technology;
(5) the IN625 nickel-based alloy powder is used for laser coaxial powder feeding additive manufacturing, 5 layers are fused and deposited on a previously printed TC4+ 20% IN625 transition layer, and the titanium alloy continuous gradient high-temperature resistant coating is obtained.
Fig. 2 shows the macroscopic structure morphology of the titanium alloy continuous gradient high temperature resistant gradient coating, and it can be found that the combination is good in the gradient transition region, the structure is gradually transformed along with the component gradient change, the lamellar structure composed of acicular martensite alpha and beta phases is transformed into an equiaxed structure, and along with the change of the alloy components, the number of alloy elements is increased, the solute concentration of a liquid-phase molten pool is increased, the components are supercooled, the nucleation rate is increased, and the structure is further refined. The titanium alloy continuous gradient high temperature resistant gradient coating prepared is compact IN structure, free of forming defects such as cracks and holes, good IN combination of transition areas, and good IN gradient combination of the TC4 titanium alloy and the IN625 nickel-based high temperature alloy.
Further analysis of the tissues shows that: the matrix material TC4 titanium alloy structure mainly comprises needle martensite alpha and beta phases, needle-shaped fine alpha phases are contained in the crystal, original beta crystal boundaries are clearly visible, the needle-shaped martensite alpha 'is the main characteristic of a lamellar structure, and needle martensite alpha' can be observed. Because the titanium alloy has high melting temperature, large heat capacity and low heat conductivity, which is exactly corresponding to the characteristics of high temperature, quick heating and cooling and the like of a laser melting pool, alpha' + beta structure is formed in the alloy after laser melting deposition, and the original beta phase on a grain boundary is reserved during high-temperature quick cooling; the TC4+ 10% IN625 gradient transition layer structure is an equiaxed structure, and the microstructure consists of primary beta and beta + Ti2Ni eutectic crystal composition; 80% TC4+ 20% IN625 gradient transition layer, the structure is thinned, on the one hand, due to the heat accumulation, the cooling speed of the formed deposition layer to the laser molten pool is reduced, so that the temperature IN the laser molten pool is increased and the orientation temperature is increased on the wholeThe gradient is weakened, and the solidification speed of the laser molten pool is reduced. On the other hand, due to the increase of the content of the nickel-based alloy, the number of alloy elements is increased, the concentration of liquid phase solute in a laser molten pool is increased, so that the supercooling of the components is obvious, and the nucleation rate is increased in the solidification process of the laser molten pool, so that the structure is refined; IN the transition region from 20% IN625 to 100% IN625, the bonding part is close to the IN625 coating, the black spots dispersed therein are gradually increased, because the Cr element and the Ni element are subjected to eutectic reaction at high temperature IN the laser melting process, and CrNi is generated2And the metal compound is remained in the solidification cooling process.
As shown IN FIG. 3, the hardness distribution of the titanium alloy continuous gradient high temperature resistant coating along the gradient direction, the hardness change is taken as a measure of the distance from the base material, the hardness of the titanium alloy continuous gradient high temperature resistant coating is hardly changed IN the area of the base material TC4, a small amount of metal compound appears with the increase of the content of the nickel base alloy of the transition layer IN625, the hardness value is gradually increased, and when the content of the nickel base alloy of the IN625 reaches 20 percent, a large amount of Ti gradually appears2Ni compound to increase hardness sharply until the content of IN625 Ni-base alloy reaches 100%, and a large amount of Ti exists IN the transition region2Ni compound, and CrNi is generated due to eutectic reaction at high temperature2The compound, further increased the hardness until near the IN625 coating surface, where the hardness dropped dramatically. The hardness and mechanical properties of the titanium alloy continuous gradient high-temperature-resistant coating are greatly improved IN a transition region, and the TC4 titanium alloy and the IN625 nickel-based high-temperature alloy realize good gradient combination.

Claims (7)

1. A titanium alloy continuous gradient high temperature resistant coating is characterized by comprising a base material, a first transition layer, a second transition layer and a surface layer which are sequentially connected, wherein the base material is a TC4 layer, the first transition layer is a TC4+10 v% IN625 layer, the second transition layer is a TC4+20 v% IN625 layer, and the surface layer is an IN625 layer;
the titanium alloy continuous gradient high-temperature-resistant coating is prepared by the following steps:
step 1, performing laser coaxial powder feeding additive manufacturing on TC4 powder to obtain a formed base material;
step 2, respectively loading TC4 powder and IN625 powder into two charging barrels of an air-borne double-barrel powder feeder, adjusting the powder conveying proportion of the two charging barrels to enable the IN625 powder to account for 10% of the volume of the mixed powder, and then melting and depositing the mixed powder on a base material through a laser coaxial powder feeding additive manufacturing technology to obtain a first transition layer;
step 3, continuously adjusting the powder conveying proportion of the two charging barrels, setting the first charging barrel to convey 80 v% of TC4 powder, setting the second charging barrel to convey 20 v% of IN625 powder, enabling the IN625 powder to account for 20% of the volume of the mixed powder, and then melting and depositing the mixed powder on the first transition layer through a laser coaxial powder feeding additive manufacturing technology to obtain a second transition layer;
and 4, carrying out laser coaxial powder feeding additive manufacturing on the IN625 powder, and carrying out melting deposition on the second transition layer to obtain a surface layer.
2. A preparation method of a titanium alloy continuous gradient high-temperature-resistant coating comprises the following steps:
step 1, performing laser coaxial powder feeding additive manufacturing on TC4 powder to obtain a formed base material;
step 2, respectively loading TC4 powder and IN625 powder into two charging barrels of an air-borne double-barrel powder feeder, adjusting the powder conveying proportion of the two charging barrels to enable the IN625 powder to account for 10% of the volume of the mixed powder, and then melting and depositing the mixed powder on a base material through a laser coaxial powder feeding additive manufacturing technology to obtain a first transition layer;
step 3, continuously adjusting the powder conveying proportion of the two charging barrels, setting the first charging barrel to convey 80 v% of TC4 powder, setting the second charging barrel to convey 20 v% of IN625 powder, enabling the IN625 powder to account for 20% of the volume of the mixed powder, and then melting and depositing the mixed powder on the first transition layer through a laser coaxial powder feeding additive manufacturing technology to obtain a second transition layer;
and 4, carrying out laser coaxial powder feeding additive manufacturing on the IN625 powder, and melting and depositing on the second transition layer to obtain a surface layer, thereby finally obtaining the titanium alloy continuous gradient high-temperature-resistant coating.
3. The method of claim 2, wherein the TC4 powder has a particle size of 100 to 200 μm.
4. The method of claim 2, wherein the IN625 powder has a particle size of 53 to 150 μm.
5. The method of claim 2, wherein the TC4 powder and the IN625 powder are vacuum dried at a heating temperature of 100 ℃ for a powder drying time of 2 hours.
6. The method of claim 2, wherein the TC4 powder is manufactured by laser co-axial powder feeding additive manufacturing, the printing environment is a pure Ar environment, and the oxygen content is below 50 ppm.
7. The method as claimed in claim 2, wherein the TC4 powder is manufactured by adopting a laser coaxial powder feeding additive manufacturing method, the laser power of the optical fiber is 1500-1800 w, the scanning speed is 480-600 mm/min, the powder feeding speed is 1.0r/min, the diameter of a laser spot is 3mm, the lap joint rate is 40-50%, and a reciprocating snake-shaped scanning strategy is adopted.
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