1234 results about "Hot isostatic pressing" patented technology

The invention belongs to the field of metal powder hot isostatic pressing and additive manufacturing near-net forming, and discloses a hot isostatic pressing forming method for preparing a substrate for additive manufacturing by mixing SS-PREP and EIGA Ti6Al4V ELI spherical powder, which comprises the following steps of: 1, mixing Ti6Al4V ELI powder prepared by SS-PREP and Ti6Al4V ELI powder prepared by EIGA according to a proportion under atmosphere protection; 2, in vacuum vibration powder loading equipment, the mixed powder is loaded into a steel sheath, and degassing seal welding is carried out; step 3, placing the seal-welded sheath in hot isostatic pressing equipment, carrying out heat preservation and pressure maintaining sintering forming, and then carrying out gradient cooling; and 4, after cooling, the steel sheath is removed through machining, and the large-size substrate for additive manufacturing is obtained. The prepared substrate has excellent comprehensive mechanical properties which are higher than the level of traditional forgings, and the application requirements of additive manufacturing are met.

Disclosed is a method for preparing a heterogeneous metal composite structure for medical implantation, including the steps of: step 1, preparing titanium alloy powder into a porous skeleton according to different printing strategies; step 2, filling magnesium after being melted into pores of the porous skeleton; and step 3, cooling a titanium-magnesium interpenetrating phase composite structure prepared in step 2 to room temperature, and covering a surface of the titanium-magnesium interpenetrating phase composite structure with a hydroxyapatite coating. In the present disclosure, a porous lattice dot-array structure of titanium alloy is used as a skeleton, and the skeleton pore is filled by pressureless infiltration of magnesium or hot isostatic pressure.

The invention relates to an additive manufacturing method and application of an aluminum-based silicon carbide composite material complex component, and the additive manufacturing method of the aluminum-based silicon carbide composite material complex component comprises the following steps: step 1, uniformly mixing silicon carbide powder and aluminum alloy powder, and drying; 2, establishing a structural model for the target part, and importing the structural model into selective laser melting forming equipment; thirdly, selective laser melting forming is conducted; fourthly, linear cutting and surface treatment are conducted; and fifthly, hot isostatic pressing treatment is conducted. The invention further provides application of the aluminum-based silicon carbide composite material complex component to precise structural components such as aviation structural components, guided missile and satellite components and optical instruments. According to the method, the problem of subsequent large-allowance removal of the aluminum-based silicon carbide composite material component is solved, the wettability between the aluminum alloy and the silicon carbide particles is improved, the mechanical property meets the application requirement, and the aluminum-based silicon carbide structural component with stable performance is obtained.

The invention belongs to the technical field of powder metallurgy, and relates to a method for preparing a high-performance GH4079 disc ring piece and a disc ring piece for an aero-engine. The preparation method comprises the following steps: firstly, preparing GH4079 spherical powder with the particle size of 106-250 microns by adopting a specific method; then, the GH4079 spherical powder is loaded into a prefabricated sheath, and degassing and seal welding treatment is carried out on the GH4079 spherical powder; then the sheath is sequentially subjected to high-temperature heat treatment and hot isostatic pressing treatment; and finally, the sheath is removed, and the powder metallurgy GH4079 blank is obtained. And the powder metallurgy GH4079 blank is subjected to heat treatment, and the GH4079 disc ring workpiece is obtained. According to the method provided by the invention, the problems of blank cracking and low yield in the existing forging process can be practically and effectively solved, and the utilization rate of the alloy material and the stability of the production process are promoted to be improved.

The invention relates to the technical field of high-temperature alloy powder metallurgy, in particular to a preparation method of a high-strength cellular distribution gamma'phase high-temperature alloy, which comprises the following steps: preparing high-temperature alloy powder; the prepared high-temperature alloy powder is loaded into a first sheath, and the first sheath is vacuumized and sealed; carrying out preheating treatment on the first sheath; the high-temperature alloy powder in the first package sleeve is dispersed; opening the first sheath, and transferring the high-temperature alloy powder from the first sheath into a second sheath through a charging bucket under a vacuum condition; performing hot isostatic pressing treatment on the second sheath filled with the powder to obtain a first workpiece; cooling the first workpiece to obtain a second workpiece; removing a second sheath outside the second workpiece to obtain a blank, and performing heat treatment on the blank to obtain a target alloy; the powder metallurgy technology is utilized, the preparation technology is adjusted, a specially-distributed gamma'phase is formed in the alloy, and therefore the tensile strength and the endurance strength of the alloy are improved.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a titanium-based composite workpiece and a preparation method and application thereof. High-entropy alloy powder with fine granularity is preferably selected as reinforcing phase powder after being prepared by adopting a gas atomization method and subjected to vibration screening, the particle size of the reinforcing phase powder and internal crystal grains of particles are fine, and after the reinforcing phase powder and titanium alloy powder are uniformly mixed, hot isostatic pressing low-temperature sintering treatment is performed, so that the high-entropy titanium alloy is obtained. Fine grain structures in reinforced phase powder particles are reserved in the titanium-based composite master alloy bar, and then a secondary plasma rotating electrode method is used for preparing powder, so that the titanium-based composite powder with uniform components and smaller grain structures is obtained; after mixing, the homogenized titanium-based composite mother alloy bar is prepared into powder through a secondary plasma rotating electrode method, chemical components are further dispersed and homogenized, reinforcing phases are distributed in all titanium-based composite powder particles, and the reinforcing effect can be further improved through an unconventional surface contact type reinforcing mode.

The invention discloses a recovery method of titanium alloy powder for additive manufacturing, and relates to the technical field of titanium alloy materials, the recovery method comprises the following steps: step 1, sheath material selection and processing: carbon steel with good welding performance is preferably selected as a sheath material; the size of the sheath is designed according to the actual ingot shape condition; 2, selecting raw materials, namely mixing titanium alloy spherical powder and micron-sized titanium alloy powder with the granularity of 15-300 mu m and the same brand, and performing an HIP + VAR process to obtain a titanium alloy cast ingot with more uniform material components and smaller element content range; a conventional titanium alloy powder hot isostatic pressing process needs a high treatment temperature which is generally between 930 DEG C and 1050 DEG C, the density of a blank after hot pressing is required to be close to 100%, according to the method, the material hot isostatic pressing treatment temperature is required to be 600 DEG C to 650 DEG C, an electrode blank with certain strength meeting VAR smelting can be obtained, energy consumption is reduced, and meanwhile the requirement for the performance of hot isostatic pressing equipment is extremely low.

The invention belongs to the technical field of metal material forming, and relates to a high-strength plastic titanium-based composite material annular part and a preparation method and application thereof. The preparation method comprises the following steps: firstly, uniformly mixing titanium alloy powder and reinforced phase powder, then preparing an annular blank according to the technological process of smelting, plasma rotating electrode atomization, degassing seal welding, hot isostatic pressing and ring rolling, and finally, annealing the annular blank to prepare the target annular part. According to the method, the titanium-based composite material powder is prepared by replacing a traditional laboratory small-batch ball milling method with a large-batch mixing method, a vacuum induction melting rod manufacturing method and a plasma rotating electrode atomization method, a reinforced phase can be introduced into a titanium matrix crystal and uniformly distributed, and the method is suitable for industrial large-batch production requirements; the titanium-based composite material annular part is prepared through the technology of powder metallurgy blank making and thermal deformation, and the effects of shortening the machining period and improving the material utilization rate and the forming rate are achieved through the precise size of powder metallurgy forming and the high efficiency of special-shaped ring rolling.

The invention provides a magnesium aluminate spinel transparent ceramic and a preparation method thereof, and the preparation method comprises the following steps: S1, raw material pretreatment, S2, vacuum hot pressing including high and low pressure circulation pressurization; and S3, hot isostatic pressing. According to the preparation method disclosed by the invention, a vacuum hot pressing process of high-low pressure circulating pressurization is combined with a step-by-step cooling and in-situ annealing process of hot isostatic pressing, so that ceramic cracking can be effectively avoided, and preparation of the large-size and high-uniformity magnesium aluminate spinel transparent ceramic is realized.

The invention discloses a TC4 titanium alloy preformed blank, a TC4 titanium alloy plate with a full lamellar structure and a preparation method of the TC4 titanium alloy plate, and belongs to the technical field of titanium alloy machining. According to the method, TC4 alloy powder prepared through hydrogenation dehydrogenation and plasma rotating electrode atomization serves as a raw material, and a high-density binary structure preformed blank is prepared through a three-step type hot isostatic pressing technology; a pure titanium sheath is adopted for packaging, two-heating-number rolling is conducted through the sheath, and the plate shape is optimized through convexity design of a working roller and dynamic roller bending force control; and after rolling, solid solution and two-stage aging composite heat treatment are combined, the head and the tail are cut off, and the TC4 titanium alloy plate is obtained. The problem of tissue segregation of a traditional cast ingot is solved through powder metallurgy, the obdurability is improved, and the anisotropy is reduced; and meanwhile, the raw material cost is reduced, the production period is shortened, the yield is increased, the surface quality is improved, and a reliable scheme is provided for green and efficient preparation of high-performance titanium alloy plates in the aerospace field.

The preparation process comprises the following steps: dissolving ammonium dimolybdate, ammonium rhenate and water at a high temperature, then adding zirconium hydroxide, uniformly mixing, carrying out vacuum drying, carrying out two-stage hydrogen reduction on the obtained precursor composite powder, and carrying out vacuum drying to obtain the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains, thereby obtaining the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains. Zirconium oxide reinforced molybdenum-rhenium composite powder obtained after reduction is subjected to cold isostatic pressing, pressureless sintering and hot isostatic pressing to obtain zirconium oxide reinforced molybdenum-rhenium alloy, and then the zirconium oxide reinforced molybdenum-rhenium alloy is obtained through high-temperature rolling and recrystallization annealing treatment. According to the method, atomic-level mixing of molybdenum and rhenium is achieved through liquid-phase doping, the microstructure of the molybdenum-rhenium alloy is more uniform and fine due to addition of ZrO2, the recrystallization temperature is increased, and the phenomenon that sintered grains of the molybdenum-rhenium alloy grow abnormally is relieved. And by optimizing the annealing process and regulating and controlling the annealing mode, grains are rearranged to form a more uniform microstructure, abnormal growth of the grains is further inhibited, and the high-temperature tensile strength and the ductility of the molybdenum-rhenium alloy are improved.

The invention belongs to the technical field of crystallizer copper plate surface treatment, and discloses a crystallizer copper plate surface coating preparation method, which comprises: 1) carrying out ball milling mixing on nickel powder and tungsten powder to obtain first mixed powder; (2) adding titanium boride powder and copper powder into the first mixed powder, and uniformly stirring to obtain second mixed powder; 3) performing vacuum hot pressing sintering or vacuum hot isostatic pressing sintering on the second mixed powder, and then crushing a sintered product to obtain coating composite powder; and (4) after the surface of the crystallizer copper plate base material is pretreated, the coating composite powder is sprayed to the surface of the crystallizer copper plate base material through supersonic flame spraying or plasma spraying, and the surface coating is formed. The surface coating has high hardness and wear resistance, and the interior of the surface coating and the surface coating and a crystallizer copper plate base material have good bonding performance, so that the service life of the crystallizer copper plate is greatly prolonged.

The invention provides a post-treatment method for laser additive manufacturing of titanium alloy. The post-treatment method comprises the steps that a titanium alloy workpiece is sequentially subjected to first annealing treatment, beta heat treatment, hot isostatic pressing treatment and second annealing treatment. Through the specific process combining beta heat treatment and hot isostatic pressing treatment, comprehensive regulation and control over the stress, defects and tissue of the titanium alloy workpiece are achieved, the internal stress of the laser additive manufacturing titanium alloy workpiece is eliminated, and meanwhile the microstructure of the laser additive manufacturing titanium alloy workpiece can be regulated and controlled while most metallurgical defects are eliminated; the strength, toughness and damage tolerance performance of the titanium alloy are synergistically improved, and the service scene of the titanium alloy can meet the static strength and fatigue damage tolerance requirements at the same time.

The invention relates to the technical field of metal materials, in particular to a preparation method of a high-performance molybdenum alloy based on a composite additive manufacturing process. According to the method, the toughened metal particles are added into the molybdenum alloy, so that cracks generated by the molybdenum alloy in laser powder bed melting can be effectively eliminated, and the novel crack-free molybdenum alloy is prepared. Meanwhile, the hot isostatic pressing technology is used for further reducing holes in the novel crack-free molybdenum alloy and improving the organization structure, so that the mechanical property of the novel crack-free molybdenum alloy is improved, and the molybdenum alloy with high compactness and high performance is prepared.

The invention discloses a preparation method of a stainless steel layered composite plate, which comprises the following steps: (1) grinding the surfaces of a stainless steel plate and a carbon steel plate which need to be compounded, then forming air exhaust holes in the edges of the opposite positions of the same ends of the stainless steel plate and the carbon steel plate, and laminating the stainless steel plate and the carbon steel plate to form an initial layered plate; (2) sealing and welding the periphery of the initial laminated plate; (3) the initial layered plate is subjected to air exhaust treatment through the air exhaust holes, and a layered composite plate blank is obtained; and (4) carrying out hot isostatic pressing treatment on the layered composite plate blank, after the hot isostatic pressing treatment is finished, carrying out pressure relief, cooling, discharging and air cooling to room temperature, then carrying out heating and hot rolling treatment, and finally straightening. By means of the method, the stainless steel layered composite plate with the large-range thickness can be prepared, the plate shape is good, stainless steel and carbon steel form compact and inclusion-free metallurgical bonding, the bonding strength reaches 360 MPa or above, the tensile strength and impact toughness of the composite plate are good, and the stainless steel intergranular corrosion performance is qualified.

The invention belongs to the field of continuous SiC fiber reinforced metal matrix composite materials, and particularly relates to a SiCf / TiMoNb-Ti2AlNb / Ti2AlNb laminated composite material and a preparation method of the SiCf / TiMoNb-Ti2AlNb laminated composite material. The composite material is of a hot isostatic pressing composite structure of a precursor wire and a Ti2AlNb sheath outside the precursor wire, the precursor wire is formed by uniformly distributing SiC fibers in a TiMoNb-Ti2AlNb laminated alloy matrix, the volume fraction of the SiC fibers accounts for 40-55% of the total volume fraction of the SiCf / TiMoNb-Ti2AlNb / Ti2AlNb laminated composite material, and the composite material is good in combination, compact and free of holes. Through the introduction of the TiMoNb-Ti2AlNb lamination layer, the composite material can be compact under a relatively low hot isostatic pressure parameter, and the effect of improving the performance can be achieved after process parameters are optimized.

The invention relates to the technical field of aluminum alloy conductor preparation, in particular to a preparation process of a light alloy conductor for a new energy automobile. The preparation process of the light alloy conductor for the new energy automobile comprises the following steps: firstly, preparing matrix aluminum alloy microspheres and graphene modified aluminum alloy microspheres; the matrix aluminum alloy microspheres and the graphene modified aluminum alloy microspheres are placed in a double-helix conical mixer according to the mass ratio of (11-16): 1 to be evenly mixed to obtain mixed alloy powder, and the mixed alloy powder is placed in a forming mold to be subjected to hot isostatic pressing treatment; and after cooling to room temperature, carrying out solution treatment, artificial aging treatment, first-stage wire drawing processing, first-stage intermediate annealing, second-stage wire drawing processing, second-stage intermediate annealing, third-stage wire drawing processing, third-stage intermediate annealing, fourth-stage wire drawing processing, fourth-stage intermediate annealing and final annealing treatment to obtain the finished light alloy conductor. The high-strength flexible cable has excellent electric conductivity and also has relatively good strength and deflection resistance.

The invention discloses a preparation method of thermal shock resistant magnesium aluminate spinel transparent ceramic, and belongs to the technical field of ceramic materials. The preparation method comprises the following steps: (1) synthesizing crystalline MgAl2O4 nano powder by adopting an additive-free hydrothermal method; (2) depolymerizing the powder, performing water-based gel casting to prepare a green body, and performing staged debonding treatment on the green body; (3) carrying out two-step vacuum presintering on the green body; (4) carrying out hot isostatic pressing densification treatment in a subgrain growth temperature region of 1380-1420 DEG C; and (5) carrying out annealing treatment on the densified ceramic. High-purity crystalline powder is synthesized through an additive-free hydrothermal method, grain boundary impurities are eliminated, and the intermediate infrared transmittance is remarkably improved; by combining the synergistic effect of optimized two-step pre-sintering and hot isostatic pressing in a sub-grain region, precise refinement of the grain size is realized; and finally, the bending strength, the fracture toughness and the critical thermal shock temperature difference of the material are greatly improved under the strengthening mechanism of ultrafine grains and defect-free grain boundaries.

The invention belongs to the technical field of TC4 alloy additive manufacturing, and discloses an electron beam melting TC4 alloy isotropic optimization method based on staged temperature control HIP, which comprises the following steps of: depositing TC4 alloy powder along the normal direction of a substrate, and printing a part through an electron beam powder bed melting additive manufacturing technology; and then, staged temperature control hot isostatic pressing treatment is carried out on the printed part, and defects generated by printing are closed. According to the method, the hot isostatic pressing (HIP) technology is adopted, under the synergistic effect of the high temperature of 920 DEG C and the high pressure (Ar protection) of 150 MPa, the defects of air holes, incomplete fusion and the like in the TC4 alloy formed through EBM are eliminated through a plastic deformation and diffusion creep mechanism, and the density is remarkably improved. Meanwhile, a metastable martensite alpha'phase is promoted to be decomposed into an equilibrium-state alpha + beta double-phase structure in a high-temperature environment, and alpha-phase grains are moderately coarsened (the average size is increased to 3.12 microns from 1.71 microns).

A method for preparing a titanium alloy by additive manufacturing, relating to the technical field of material preparation. The technical solution used is: first, eliminating holes in a printing material by means of additive manufacturing and hot isostatic pressing processes; and then on the basis of the critical temperature and time for grain growth and phase transformation, carrying out high-temperature short-time solution treatment on the printing material, and carrying out aging treatment on a sample obtained by means of the solution treatment and water cooling, to optimize the material structure. The method for preparing a titanium alloy by additive manufacturing overcomes the technical barriers of printing holes, lath coarsening and grain boundary α phase that are inevitable in traditional printing processes, hot isostatic pressing and traditional heat treatment, does not require fine optimization of the printing and hot isostatic pressing processes, and can conveniently and efficiently obtain an additively manufactured titanium alloy having an ultrahigh fatigue strength, greatly reducing costs and improving efficiency. Also provided is an additively manufactured titanium alloy.

The invention discloses a silicon carbide / silicon dioxide hybrid reinforced aluminum-based composite material and a preparation method thereof.The performance of the silicon carbide reinforced aluminum-based composite material is improved through low-density and low-expansion-coefficient silicon dioxide, and the wettability of silicon carbide and an aluminum alloy matrix can be improved by adding the silicon dioxide; and the thermal expansion coefficient of the aluminum-based composite material can be further reduced. According to the method, the aluminum alloy powder is obtained by adopting an aerosol method, and the high-energy ball milling method and the hot isostatic pressing sintering process are combined, so that the composite powder is formed under uniform pressure and lower temperature, an AlC3 brittle phase generated by harmful interface reaction is avoided, the compactness of the aluminum-based composite material can be greatly improved, and the service life of the aluminum-based composite material is prolonged. The problems that an aluminum alloy matrix containing silicon carbide reinforced particles is poor in wettability and poor in size stability under the condition that the temperature changes drastically are solved.

The disclosure provides Si-free aluminum alloys comprising Ce, Zn, and Mg suitable for laser powder bed fusion (LPBF) 3D printing. The printed components can be subjected to hot isostatic pressing and further heat treated to provide 3D printed components exhibiting higher hardness than existing Al-Si based alloys produced under the same conditions. The Si-free aluminum alloy resists coarsening of second phase on HIP, retaining high strength and hardness. The alloy also does not need separate solutionizing and water quenching following HIP, thus saving cost, time and permitting design of more delicate and intricate geometries.

The invention discloses a rare earth modified cast high-temperature titanium alloy and a preparation method and application thereof, and belongs to the technical field of high-temperature titanium alloys. The alloy comprises the following components in percentage by mass: 5.50% to 6.50% of Al, 3.50% to 5.00% of Sn, 3.50% to 5.00% of Zr, 0.20% to 0.80% of Mo, 0.10% to 0.30% of Si, 0.25% to 0.55% of Nb, 0.20% to 0.40% of Ta, 0.40% to 0.60% of W, 0.25% to 0.35% of Nd and the balance of Ti and impurities. By adding narrow-interval rare earth Nd and utilizing the synergistic effect of structure purification and dispersion strengthening, the effective Al equivalent of an alpha phase is reduced, so that precipitation and growth of a Ti3Al brittle ordered phase in the high-temperature long-time service process are remarkably inhibited. The preparation method comprises a vacuum melting process and an innovative five-stage hot isostatic pressing process, and the process realizes densification, homogenization and structure stabilization integrated treatment through programmed temperature and pressure regulation and control. The obtained alloy has excellent high-temperature strength, plasticity and long-time structure stability at the temperature of 650 DEG C or above, and is suitable for high-temperature structural parts of aero-engines and gas turbines.

The invention belongs to the technical field of composite material preparation, and particularly relates to a preparation method of a SiCf / TiMoNb heterogeneous core material reinforced GH4169 composite material. The preparation method comprises the following steps: depositing a TiMoNb alloy matrix on the surface of SiC fiber by using a magnetron sputtering method to form a precursor wire, carrying out composite molding on the obtained precursor wire and a GH4169 sheath in a hot isostatic pressing manner, and carrying out diffusion bonding to form the composite material. The obtained composite material SiCf / TiMoNb / GH4169 has excellent unidirectional performance at high temperature, the tensile strength at 850 DEG C can reach 1057 MPa, and the high-temperature strength of GH4169 alloy is effectively improved. The prepared composite material is high in high-temperature strength and has good application prospects, and the adopted preparation process is mature in technology and little in pollution.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention relates to the technical field of dissimilar metal connection, in particular to a copper-steel bimetal piece with a complex inner runner and a preparation method thereof.The preparation method comprises the steps that a cooling runner is preprocessed through a copper alloy blank, and a primary copper alloy workpiece is obtained; the primary copper alloy part is cleaned, and a secondary copper alloy part is obtained; the stainless steel blank is subjected to surface treatment and cleaning, and a stainless steel workpiece is obtained; the secondary copper alloy workpiece and the stainless steel workpiece are assembled and then are arranged in a sheath; the sheath is heated and vacuumized and then is sealed and welded; carrying out hot isostatic pressing treatment on the sealed and welded sheath to obtain an intermediate part; and the steel ladle sleeve outside the middle part is removed, and the copper-steel bimetal part is obtained. According to the method, the phenomena of generation of brittle intermetallic compounds on the interface and grain coarsening are avoided, the connection strength is remarkably improved, interface metallurgical bonding and high-precision shape control of a cooling runner are synchronously completed in a single process, and the geometric precision of the copper-steel bimetal part is guaranteed.

The present application relates to the technical fields of laser additive manufacturing, and discloses a kind of metal matrix composite composite additive manufacturing methods, comprising: the mixing of pre-prepared composite powder, substrate pretreatment, laser bottom layer cladding preparation bottom layer structure;Electron beam selective melting additive preparation main functional layer, obtain rough parts;Rough parts post-processing.The present application improves the wettability between metal matrix and TiC reinforcing phase through the transition effect of laser cladding bottom layer and hot isostatic pressing post-processing, improves the interface bonding strength, avoids the interface peeling problem under load;Through laser cladding, realize rapid bottom layer forming, electron beam selective melting ensures high-precision functional layer manufacturing, and is suitable for the integrated manufacturing of complex structure (such as hollow, thin-walled) metal matrix composite parts.

The invention discloses a method for preparing a powder high-speed steel billet, the powder high-speed steel billet and application, and relates to the technical field of advanced manufacturing of metal materials. The powder high-speed steel billet is prepared through the high-frequency induction hot pressing sintering method, rapid manufacturing of the powder high-speed steel billet can be achieved, and the performance of the obtained product can reach the product level of traditional hot isostatic pressing sintering. And compared with a traditional hot isostatic pressing preparation method, the technological process is simple, the period is short, preparation of a sheath is avoided, the cost can be reduced, and the safety can be improved. The density of the prepared powder high-speed steel can reach 98.5%, the microhardness reaches 365 Hv, the tensile strength and the yield strength reach 723 MPa and 687 MPa correspondingly, short-process and low-cost preparation of the powder high-speed steel billet can be achieved, and the obtained powder high-speed steel billet can be used for manufacturing hardware knives and scissors, mechanical molds and the like.

The invention discloses a near-net forming method for a titanium alloy-based composite material powder component, belongs to the technical field of thin-wall complex component manufacturing, and particularly aims at near-net forming of a high-temperature titanium alloy-based composite material thin-wall complex component. Aiming at a complex thin-wall titanium alloy cabin section structural component with the service temperature reaching 700-750 DEG C, the high-temperature titanium alloy-based thin-wall complex component is obtained through a proper TiB2 powder and Ti60 powder matching and uniform powder mixing process and through a sheath design, a hot isostatic pressing process and a sheath removal process. Through a titanium alloy-based composite material hot isostatic pressing near-net forming technology, tissue-performance integrated regulation and control are achieved.

The invention discloses a heat treatment method for improving the mechanical property of a GH4099 high-temperature alloy, which comprises the following steps: firstly, printing a GH4099 alloy material into a part by adopting an additive manufacturing method, and then sequentially carrying out annealing treatment, hot isostatic pressing treatment, solution treatment and aging treatment on the part to obtain a final part, annealing treatment, hot isostatic pressing treatment (HIP), solution treatment and aging treatment are sequentially conducted on the GH4099 alloy subjected to 3D printing, the defects and texture problems generated by printing are eliminated through hot isostatic pressing treatment, and then the mechanical property of the GH4099 alloy is further improved through solution treatment and aging treatment.