905 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.

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 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 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 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 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 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).

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 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 TC4 titanium alloy preformed blank, a TC4 titanium alloy plate and a preparation method of the TC4 titanium alloy preformed blank and 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, the head and the tail are cut off in combination with composite heat treatment, and the TC4 titanium alloy plate is obtained. According to the method, the problem of traditional cast ingot structure segregation is solved through powder metallurgy, the preparation cost of the TC4 titanium alloy plate is reduced, the production period is shortened, the yield and the surface quality are improved, and a reliable scheme is provided for green and efficient preparation of the high-performance titanium alloy plate in the aerospace field.

The invention provides a method for preparing a high-performance silicon nitride ceramic ball based on a pressure modulation sintering technology, and relates to the field of functional ceramic material preparation, and the method comprises the following steps: 1, preparing a green body; 2, PMS sintering is carried out; step 3, cooling; traditional high-performance silicon nitride ceramic balls (the relative density is required to be larger than 99%, the Vickers hardness is required to be larger than or equal to 1500 kgf / mm, the bending strength is required to be larger than or equal to 920 MPa, and the fracture toughness is required to be larger than or equal to 6.0 MPa.m / ) are mainly prepared through a two-step process of normal pressure / air pressure sintering (GPS) and hot isostatic pressing (HIP). Although high densification of the material can be realized, the method has the problems of complicated process flow, high energy consumption, long production period, high equipment occupancy rate and the like.

The invention belongs to the field of waste graphite treatment, and particularly discloses a preparation method of a waste graphite-based rate type artificial graphite negative electrode material, which comprises the following steps: carrying out resonance mixing treatment on waste graphite powder and an auxiliary agent A to obtain primary particles; carrying out hot isostatic pressing treatment on the primary particles, a binder and a coke raw material under ultrasonic assistance to obtain secondary particles; wherein the weight ratio of the waste graphite powder to the coke raw material in the primary particles is (1-4): (6-9); the secondary particles are subjected to first-stage heat preservation treatment in advance at the temperature of 800-1200 DEG C in an atmosphere A containing shielding gas, then second-stage heat preservation treatment is carried out at the temperature of 2000-2800 DEG C in an atmosphere B containing an auxiliary B, and a graphite material is obtained; and carrying out post-treatment on the graphite material to prepare the waste graphite-based rate type artificial graphite negative electrode material. According to the method disclosed by the invention, the graphite material with high rate performance can be obtained based on regeneration of the waste graphite.

The invention belongs to the technical field of all-solid-state lithium batteries, and particularly relates to a densified sulfide all-solid-state battery composite positive electrode material and a preparation method and application thereof. The preparation method of the composite positive electrode material comprises the following steps: (1) raw material pretreatment: mixing a positive electrode active substance, a sulfide solid electrolyte and an additive according to a predetermined mass ratio under the protection of an inert atmosphere, and carrying out mechanical grinding to obtain composite positive electrode powder; the additive is Li3PO4 (lithium phosphate); (2) isostatic pressing pretreatment: performing hot isostatic pressing treatment on the composite positive electrode powder, and then controlling the cooling rate to cool to room temperature to obtain a densified composite positive electrode blank; (3) adding a conductive agent and a binder into the densified composite positive electrode blank, and mixing; the composite positive electrode material is obtained; the binder is formed by compounding nano-scale polytetrafluoroethylene and micron-scale polytetrafluoroethylene according to a mass ratio of 1: 2-1: 4.

The invention discloses application of a double-channel powder feeding process in preparation of an aero-engine turbine disc blank, belongs to the technical field of aero-turbine disc manufacturing, and is characterized in that high-temperature alloy powder is subjected to gradient proportioning deposition through a double-channel system by an electric arc powder feeding additive process, and material gradient distribution is formed in disc center, transition and disc edge areas; meanwhile, dynamic mechanical deformation is applied to a new deposition layer in a high-temperature plastic state by adopting a synchronous micro-forging process, hot isostatic pressing treatment is carried out on a prepared turbine disc blank to eliminate internal defects, high-temperature homogenizing annealing is carried out in a vacuum furnace to improve the structure uniformity, and finally, the required mechanical property is obtained through solution treatment and aging treatment. The gradient accurate control of material components in different areas of the turbine disc is realized, the microstructure of a deposition material can be effectively improved, regulated and controlled in the manufacturing process, and metallurgical defects are reduced.

The invention relates to the technical field of high-temperature alloy additive manufacturing, and discloses a method for preparing a low-crack-sensitivity nickel-based high-temperature alloy through selective laser melting and application of the low-crack-sensitivity nickel-based high-temperature alloy. And selective laser melting forming treatment is conducted on the core-shell structure powder, specifically, regional laser scanning, interlayer pulse pressurization and in-situ heat treatment are conducted, and the low-crack-sensitivity nickel-based high-temperature alloy is obtained. According to the invention, synchronous regulation and control of microcrack closing and nanophase precipitation are realized through design of core-shell structure powder, laser regional dynamic energy control scanning of hot lines and interlayer in-situ densification. By means of the method, the SLM forming crack density can be reduced to be smaller than or equal to 0.1 mm / mm, the anisotropy index is smaller than or equal to 1.05, the post-treatment hot isostatic pressing link is omitted, and the method can be applied to thin-wall high-cycle fatigue parts such as aero-engine flame tubes and aerospace turbine pump rotors.

The invention belongs to the technical field of powder metallurgy, and relates to a preparation method of a high-temperature titanium alloy conical barrel, which comprises the following steps of: firstly, filling 50-150 microns of high-temperature titanium alloy powder into a cylindrical sheath with a simple structure, and filling the powder through vibration to ensure that the density of the high-temperature titanium alloy powder in the cylindrical sheath is 60-70%; then, after the cylindrical sheath is vacuumized and sealed, hot isostatic pressing is conducted for 2-4 h at the temperature of 900-1100 DEG C and the pressure of 100-200 MPa, and a cylindrical blank is obtained; and finally, under the spinning conditions of 800-1000 DEG C and 50-150 r / min, the cylindrical blank is gradually deformed into the target conical barrel piece through a spinning mold. By using the cylindrical sheath, the preparation difficulty and cost of the sheath are simplified, and the powder loading uniformity is improved; the size and shape are accurately controlled through the spinning technology, densification of hot isostatic pressing and grain refinement of spinning deformation are combined, the size precision and mechanical performance of the component are remarkably improved, the forming problem of the component with the complex shape is solved, and the method is suitable for preparing the high-quality high-temperature titanium alloy conical barrel in the fields of aerospace and the like.

The invention discloses an anti-oxidation packaging material for hot rolling of thermoelectric materials and a preparation method of the anti-oxidation packaging material, and relates to the technical field of new materials. The packaging material is of a three-layer composite tubular structure and sequentially comprises, from inside to outside, an anti-oxidation barrier layer which is a composite material with an Fe-Al intermetallic compound as a matrix and Y2O3 particles dispersed and distributed; the transition layer is a Ni-Cr-Fe-Mn-C series solid solution alloy with Ni as a matrix; and the structure supporting layer is made of microalloyed low-carbon bainite steel. The layers are metallurgically bonded through hot isostatic pressing, and then the hollow composite pipe is manufactured through cold drawing. The packaging material has excellent high-temperature oxidation resistance, good plastic deformation capacity and structural strength, can effectively isolate oxygen, coordinate strain and maintain overall integrity in the high-temperature hot rolling process, is suitable for protection and densification of Bi2Te3-based, PbTe-based and SiGe-based thermoelectric materials and the like, and remarkably improves thermoelectric performance and production consistency of the thermoelectric materials.

The invention provides a silicon carbide fiber-copper composite bonding wire and a preparation method thereof, and relates to the technical field of electronic materials. The preparation method of the silicon carbide fiber-copper composite bonding wire comprises the following steps: pre-plating copper on the surface of silicon carbide fiber to obtain copper-coated silicon carbide fiber; laying copper-coated silicon carbide fibers to obtain a copper-coated silicon carbide fiber layer, then constructing a copper alloy layer on the copper-coated silicon carbide fiber layer by using composite copper powder, then arranging the copper-coated silicon carbide fiber layer on the surface of the copper alloy layer again, and repeating the operation to obtain a composite wire blank in which the copper-coated silicon carbide fiber layers and the copper alloy layers are alternately arranged; and sequentially carrying out hot isostatic pressing treatment, drawing and aging treatment on the composite wire blank to obtain the silicon carbide fiber-copper composite bonding wire. The copper powder further comprises Ag, Hf and Sc, the metal elements can form fine and dispersed second-phase particles in the preparation process, and the strength of the copper bonding wire is remarkably improved through a precipitation strengthening mechanism.

The invention relates to the technical field of coating materials, and particularly discloses a metallurgical strengthening preparation process of a wear-resistant coating of a high-stress valve ball. Comprising the following steps that S1, a porous structure supporting layer is prepared, specifically, cobalt-based alloy powder and a pore forming agent are mixed according to the mass ratio of (85-92): (8-15), and a porous middle layer is formed on the surface of a sphere base body through sintering; s2, coating slurry is injected; s3, sintering is carried out; s4, carrying out laser micro-texture treatment; s5, embedding a solid lubricant; s6, performing hot isostatic pressing densification; and S7, vibration auxiliary polishing is conducted. The metallurgical strengthening preparation process for the wear-resistant coating of the high-stress valve ball can be used for surface strengthening treatment of high-parameter valve core ball parts in the fields of petrochemical engineering, electrical energy, aerospace and the like, and has the advantages of high bonding strength between the coating and a matrix, excellent high-temperature wear resistance and thermal shock resistance, stable friction coefficient, long service life, high wear resistance and the like. And the method has the advantages of high process adaptability and low bonding failure risk.

The invention relates to a high-density sintered magnesium aluminate spinel transparent ceramic and a preparation method thereof, and belongs to the technical field of transparent ceramic preparation, and the preparation method comprises the following steps: preparing MgO-Al2O3 core-shell powder through an ALD technology, doping rare earth, dispersing and modifying the powder, carrying out cold isostatic pressing molding, carrying out vacuum liquid phase sintering, carrying out hot isostatic pressing post-treatment and the like. By optimizing the raw material design, the powder preparation and the sintering process, the sintering temperature is remarkably reduced, the grain size is refined, the percentage of closed area is greatly reduced, and the infrared light transmittance is improved to 86% or above. The problems of high sintering temperature, large percentage of close area, uneven crystal grains and the like in the traditional process can be effectively solved.

The invention provides a ruthenium-cobalt target material for forming a component gradient thin film, which comprises a target material unit and a back plate, the target material unit has different ruthenium-cobalt proportions, and the target material unit is prepared by uniformly mixing ruthenium powder and cobalt powder according to different atomic ratios, carrying out die forming and then carrying out hot isostatic pressing sintering, the target material units with two different component proportions are sequentially and alternately spliced and fixed on the back plate to form the ruthenium-cobalt target material. The ruthenium-cobalt target material is composed of two ruthenium-cobalt alloy target materials with different ruthenium-cobalt proportions, the ruthenium-cobalt target materials are fixed to the same back plate, and the gradient film with the ruthenium-cobalt components continuously changing in the film thickness direction can be formed by adjusting sputtering parameters under the condition that the target material is not replaced.

The invention belongs to the technical field of nickel-based alloy material processing and forming, and particularly relates to a preparation method and application of a powder metallurgy and isothermal forging In738 disc shaft ring piece. The hot isostatic pressing technology is adopted for preforming the blank, internal gaps and cracks of the material are eliminated, the structure is homogenized, element segregation is improved, the fatigue life is prolonged, and a plastic blank is provided for subsequent isothermal forging. Furthermore, the temperature difference between the blank and the mold is reduced through preheating treatment, deformation resistance sudden change caused by local chilling is avoided, and microcrack initiation is inhibited. In addition, dynamic recrystallization is promoted through isothermal forging, a fine equiaxed crystal structure is obtained, and the high-temperature strength is improved; and through solution treatment, grain coarsening is inhibited, a supersaturated solid solution is reserved, and driving force is provided for aging precipitation. And then a dual-mode gamma'phase strengthening system is formed through a two-stage aging process, and the endurance life is optimized. Therefore, the high-temperature comprehensive mechanical property of the In738 nickel-based alloy is improved, and the use requirement of the In738 nickel-based alloy at high temperature is met.

The invention relates to the field of materials, and provides a high-temperature and high-pressure accurate control method for powder hot isostatic pressing titanium alloy. The method comprises the following steps: placing a sealed package in hot isostatic pressing equipment, raising the temperature to 80-90% of 400-550 DEG C at a first temperature rise gradient, raising the pressure to a first target pressure at a first pressure rise gradient, keeping the temperature and the pressure, raising the temperature to 600-750 DEG C at a second temperature rise gradient, raising the pressure to a second target pressure at a second pressure rise gradient, keeping the temperature and the pressure, and cooling to the room temperature; raising the temperature to 850-950 DEG C according to a third temperature raising gradient, and keeping the temperature and the pressure to obtain a titanium alloy ingot; and the titanium alloy ingot is cooled to 700-750 DEG C and subjected to heat preservation for 0.5-1 h, then the titanium alloy ingot is heated to 950-1050 DEG C and subjected to heat preservation for 0.5-1 h, water quenching is conducted to the room temperature, and the titanium alloy component is obtained. The compactness, tensile strength, yield strength and fracture toughness of the titanium alloy component can be improved, and the comprehensive performance is more excellent.

The invention relates to the field of metal material fatigue performance optimization, in particular to a post-treatment method for improving the fatigue performance of an additive manufacturing TA15 alloy. The method comprises the following steps that a printing state material of the additive manufacturing TA15 alloy is taken to be subjected to annealing treatment, and a destressing state material of the additive manufacturing TA15 alloy is obtained; then carrying out hot isostatic pressing treatment; carrying out solution treatment on the material subjected to hot isostatic pressing treatment; and then aging treatment is carried out. According to the method, solution aging treatment is combined on the basis of HIP, on the basis of eliminating pores, coarsening of alpha laths is inhibited, the grain boundary alpha enrichment distribution density in the additive manufacturing TA15 alloy is reduced, the microstructure of the alloy is further optimized, the fatigue strength of the additive manufacturing TA15 alloy can be effectively improved, and the process is simple, convenient and reliable.

The invention belongs to the technical field of metal powder preparation, particularly relates to a high-efficiency and low-energy-consumption device and method for recycling and regenerating high-temperature alloy powder, and aims to solve the problems of high energy consumption, low efficiency, degraded powder performance, low cyclic utilization rate and the like in the existing recycling technology. A ceramic flash sintering technology and a metal material current-assisted sintering device are innovatively combined, a special device with a unique current-assisted sintering mechanism is developed, the device can efficiently and rapidly sinter large-size metal blanks under the low-pressure condition, the sintering time is shortened by 30%-50%, the temperature is reduced by 100-200 DEG C, the energy consumption of a unit product is reduced by 40% or above, and the production efficiency is improved. And meanwhile, by accurately controlling the sintering atmosphere and pressure, it is ensured that the oxygen content of circulating powder is lower than 50 ppm. According to the method, through the pressing-sintering-hot isostatic pressing treatment process, the recycled powder can be directly returned to the powder manufacturing procedure, the cyclic utilization rate of 95% or above can be achieved without re-smelting, and an innovative solution is provided for sustainable utilization of the high-value metal powder.