16 results about "Thermomechanical processing" patented technology

The application belongs to the field of high-temperature alloy, and relates to a preparation method for improving the sustained load crack propagation resistance of powder nickel-based high-temperature alloy and parts thereof. According to the final composition of the alloy, two component alloys with a difference of more than 25 DEG C in the gamma prime phase solid solution temperature are selected, the powders of the two component alloys are uniformly mixed, and then hot isostatic pressing or other thermal mechanical processing methods are used to prepare the alloy and part blanks, and a heat treatment system is selected according to the gamma prime phase solid solution temperature of the two component alloys. The powder nickel-based high-temperature alloy and parts prepared by the method can coordinate and improve the sustained load crack propagation resistance of the material by adjusting the composition and proportion of the two component alloys, and the service performance and life of the prepared aero-engine turbine disc are improved.

This invention discloses a short-process rapid solidification / powder metallurgy technology and its applications. The short-process rapid solidification / powder metallurgy technology of this invention includes the following steps: Step 1: Using metal wire or powder as raw material, a bulk blank with a thickness of 1-10 mm is deposited on a substrate using thermal spraying technology; the metal is selected from magnesium, titanium, copper, iron, nickel, zinc, aluminum, or their alloys; Step 2: The bulk blank is thermomechanically processed to obtain a sheet product; the thermal spraying technology includes flame spraying, supersonic spraying, arc spraying, plasma spraying, or cold spraying; the thermomechanical processing includes hot rolling, hot extrusion, or hot forging. This invention significantly shortens the preparation process, consumes less energy, has low overall production costs, and has wide applicability, and can be applied to the preparation of metal matrix composites, ultrafine-grained metal materials, heterostructure metal materials, layered structure metal composites, etc.

This invention provides a Y₂O₃ ceramic particle-reinforced dual-phase lightweight refractory high-entropy alloy, its preparation method, and its applications. The general formula for Y₂O₃ ceramic particle-reinforced dual-phase lightweight refractory high-entropy alloy is Ti. a Zr b V c Nb d Al e -(Y2O3) f The alloy exhibits a molar percentage of 52% ≤ a ≤ 57%, 8% ≤ b ≤ 12%, 12% ≤ c ≤ 18%, 8% ≤ d ≤ 12%, 9% ≤ e ≤ 13%, and 0.02% ≤ f ≤ 0.08%, with a + b + c + d + e + f = 100%. In the as-cast state, the alloy displays a typical dendritic morphology, with a phase structure consisting of a body-centered cubic (BCC) structure and a Y₂O₃ ceramic phase. It not only possesses low density but also exhibits excellent tensile yield strength and plasticity at room temperature. Thermomechanical processing improves the size and distribution of the Y₂O₃ ceramic phase, further enhancing the alloy's yield strength.

The application discloses a preparation method of reinforced 18-8 austenitic stainless steel. In the basic 18-8 austenitic stainless steel component, more than 0.05 wt.% and less than 0.1 wt.% of metal Ti is added, and smelting is carried out according to the following component element adding sequence: pure iron and metal Ni are added first, then metal Cr with a target content of 40% to 60% is added, then metal Ti is added, and finally the remaining target content of metal Cr and other elements in the component are added; before the metal Ti is added, the free oxygen content in the molten steel is controlled to be 30 to 60 ppm, and the N element content is not more than 100 ppm; thereby forming the reinforced 18-8 austenitic stainless steel. The application further discloses a reinforced 18-8 austenitic stainless steel. Compared with the prior art, the application does not need additional thermal mechanical processing or heat treatment, and the preparation of the reinforced 18-8 austenitic stainless steel can be realized through a basic smelting process, and the size of the prepared steel material is not limited.

This invention discloses an efficient magnetic domain refinement method for ultra-low loss oriented silicon steel, relating to the field of steel material technology. The method includes: raw material preparation; hot rolling and final rolling; multi-stage thermomechanical processing; controlled suppression phase formation; secondary re-junction and magnetic field-induced selective growth; surface microstructure fabrication; low-temperature domain refinement annealing and alternating magnetic field coupling; segmented cooling and quality inspection. This invention, through controlled nanoscale suppression phase engineering, forms a high-density and uniform nanoscale suppression phase within the matrix, serving as pinning sites for grain boundaries and subgrain boundaries. This controls grain boundary migration dynamics during high-temperature secondary re-junction, overcoming the problems of abnormal grain growth and microstructure instability caused by uneven distribution and large size dispersion of traditional suppression phases. This avoids the root cause of large magnetic domains, improves the controllability and repeatability of the secondary re-junction process, obtains a more uniform orientation grain size distribution, and reduces localized magnetic domain enlargement and iron loss fluctuations caused by uneven grain size.

This invention discloses a high-strength, lightweight aluminum-based medium-entropy alloy and its preparation method, relating to the technical field of lightweight medium-entropy alloy materials. The raw material composition of this aluminum-based medium-entropy alloy, expressed as Al in atomic percentage, can be... a Ti b Cr c M d The alloy comprises 45-65% Al, 10-30% Ti, 15-30% Cr, and 5-10% M, where M is one or more of Sc, V, and Mn, and a+b+c+d = 100. The specific preparation method is as follows: Pretreated raw materials are weighed according to the proportions and placed in a vacuum arc melting furnace or vacuum induction melting furnace. The alloy is melted under high-purity argon protection and held at a constant temperature to ensure uniform composition. The molten alloy is then poured into a preheated cast iron mold or water-cooled copper mold and allowed to cool naturally to room temperature to obtain an aluminum-based medium-entropy alloy ingot. The aluminum-based medium-entropy alloy prepared by this invention possesses both low density and high strength. Its as-cast microstructure is predominantly a solid solution phase, exhibiting excellent strength-plasticity matching. This allows for the fabrication of lightweight, high-performance cast structural parts without the need for complex thermomechanical processing.

The invention provides a high-plasticity iron-based alloy and a preparation method thereof, and relates to the technical field of metal material processing. Comprising the following steps: preparing iron-based alloy molten steel containing manganese, silicon and aluminum; before casting, the iron-based alloy molten steel is sequentially subjected to deoxidation pretreatment and rare earth microalloying treatment, and bottom blowing gas stirring is assisted in the deoxidation pretreatment and the rare earth microalloying treatment; casting the treated molten steel to obtain a cast ingot; and carrying out thermal mechanical processing and solution treatment on the cast ingot to obtain the high-plasticity iron-based alloy. The method is used for solving the problems that in the prior art, the form and distribution of brittleness and easily-deformed inclusions in steel cannot be effectively regulated and controlled, stress concentration points cannot be eliminated from the source, and therefore strain localization is difficult to restrain fundamentally.

The present disclosure concerns a method for obtaining a component made of a palladium (Pd)-indium (In) alloy comprising between 46 and 56 wt % Pd, between 44 and 54 wt % In, between 0 and 10 wt % of silver (Ag), gold (Au), platinum (Pt), silicium (Si), or tin (Sn), or a combination of these elements, between 0 and 2 wt % of a grain refiner, between 0 and 5 wt % of aluminum (Al), and a maximum of 1.5 wt % of other elements. The method comprises the steps of providing the Pd—In alloy, and thermomechanical processing the Pd—In alloy with hot pressing at a heating temperature between 1050° C. and 1150° C., at controlled deformation rate of 0.1 to 100 mm / h with an applied load between 1 and 500 MPa, and with a deformation ratio between 1.2 and 15.

The invention provides a preparation method of a thermoelectric device and the thermoelectric device. The method comprises the steps that after Fe powder, Ni powder and Mo powder are mixed according to the atomic ratio of (30%-39%): (20%-26%): (35%-50%), the N-type FeNiMo alloy is prepared through first thermal machining, and after Fe powder, Ni powder and Mo powder are mixed according to the atomic ratio of (40%-48%): (27%-32%): (20%-34%), the P-type FeNiMo alloy is prepared through second thermal machining. Processing the N-type FeNiMo alloy and the P-type FeNiMo alloy into thin sheets to respectively obtain an N-type barrier layer sheet and a P-type barrier layer sheet, placing the N-type barrier layer sheet and the P-type barrier layer sheet with thermoelectric materials according to a sequence of barrier layer sheet-thermoelectric material-barrier layer sheet, and performing hot pressed sintering to respectively obtain an N-type thermoelectric single leg and a P-type thermoelectric single leg; and finally, welding with electrodes according to a sequence of'hot end electrode-thermoelectric single leg-cold end electrode 'to obtain the thermoelectric device. The method can improve the stability and service life of the thermoelectric device.

An intelligent, simulation-based system for the microstructural development of hydrogen embrittlement-resistant vanadium medium-carbon steel alloys for aerospace applications, comprising: • an alloy composition optimization module; • a thermodynamics and phase transformation simulation module; • a microstructure development module; • a hydrogen diffusion and storage simulation module; • an artificial intelligence optimization module; • a thermomechanical processing simulation module; • a finite element module for aerospace stress analysis; • a digital twin validation module; • a corrosion and environmental prediction module; and • a real-time structural condition monitoring and adaptive control aerospace module.the modules work together cooperatively to produce optimized vanadium medium carbon steel alloy compositions and processing parameters configured to improve resistance to hydrogen embrittlement, fracture toughness, fatigue strength, corrosion resistance and structural reliability in aerospace applications.

The invention provides multi-element particle dispersion strengthened high-strength austenitic heat-resistant steel and a preparation method thereof, and belongs to the technical field of corrosion-resistant high-strength structural materials for high-temperature environments. According to the high-strength austenitic heat-resistant steel, non-carbonization improvement is conducted on the basis of SUS316 austenitic stainless steel components, CeO2, Al, Nb, Cu, W and B are added, and the high-strength austenitic heat-resistant steel is prepared through smelting in a vacuum induction furnace, casting forming, high-temperature forging, hot rolling forming and online heat treatment. According to the method, the high-temperature strength of the austenitic heat-resistant steel can be comprehensively improved, and the sizes and distribution of intermetallic compounds and oxide particles are controlled by regulating and controlling electromagnetic stirring vacuum melting and thermal machining treatment parameters. According to the method, the problems that traditional austenitic stainless steel is insufficient in heat resistance, contains carbon and is not good in corrosion resistance are solved, and the method has high market competitiveness and application prospects.

The invention relates to the technical field of rare earth-doped composite alloy preparation, in particular to a high-temperature-resistant rare earth-doped composite alloy material and a preparation method thereof.The preparation method comprises the steps that a consumable electrode is smelted; the reduction amount of the melting speed of the consumable electrode in the smelting process is obtained, and the vacuum pumping speed is adjusted; the falling length of molten drops is obtained, and the direction of an induced magnetic field of a plasma area vertically below the consumable electrode is determined; the stirring rotating speed of the electromagnetic stirring mechanism is determined according to the length ratio of time sections with opposite magnetic field directions in the induced magnetic field direction and the electromagnetic stirring magnetic field direction; a molten pool splashing plane image is obtained, the height section of the corresponding impurities on the consumable electrode is determined, and the working current in the smelting process is adjusted according to the height section; and after the smelting process is completed according to the working current, a generated cast ingot is subjected to thermal machining and heat treatment, and the high-temperature-resistant rare earth-doped composite alloy material is formed. The preparation efficiency of the rare earth doped composite alloy is improved.

The invention discloses a thermomechanical treatment method of a copper-chromium-zirconium alloy strip, which comprises the following steps: weighing casting raw materials according to a preset ratio range, and putting the casting raw materials into a smelting furnace for smelting and casting to obtain a cast ingot, the casting raw materials comprising a Cu raw material, a Cr raw material, a Zr raw material and impurities; carrying out heating treatment and hot rolling treatment on the cast ingot to obtain a hot-rolled blank, and carrying out primary solid solution treatment on the hot-rolled blank to obtain a primary solid solution blank; primary cold rolling treatment is carried out on the primary solid solution blank, intermediate heat treatment is carried out on a primary cold-rolled strip, secondary solid solution treatment is carried out on an intermediate strip, and a secondary solid solution blank is obtained; secondary cold rolling treatment is conducted on the secondary solid solution blank, and a secondary cold-rolled strip is obtained; and the secondary cold-rolled strip is subjected to aging treatment, and the copper-chromium-zirconium alloy strip is obtained. By designing the combination of multi-stage solid solution and specific intermediate heat treatment, a precipitated phase is induced to be precipitated in a finer and more dispersed form in the cold rolling process, and the strength and conductivity of the alloy are improved.

The invention discloses a fine grain heterogeneous titanium alloy material with a composite strengthening effect and a preparation method, and belongs to the field of high-toughness titanium-based composites.The preparation method comprises the steps that a prepared raw material added with large-particle LaB6 is smelted into a cast ingot through vacuum induction smelting; the cast ingot is subjected to hot rolling after being homogenized, and a target titanium alloy plate is obtained; according to the obtained titanium-based alloy, under the condition that plasticity is not sacrificed, the longitudinal tensile yield strength is improved to 870 MPa, the tensile strength is improved to 1050 MPa, and the ductility can reach 24%; the transverse tensile yield strength is equivalent to the tensile strength. According to the method, smelting and thermal machining are cooperatively controlled, LaB6 particles of 1-5 mm are directly introduced into the titanium-based alloy in a smelting mode to serve as a reinforcing phase raw material, so that TiB whiskers and La2O3 particles are generated in situ in the smelting process of LaB6 to refine crystal grains, a heterogeneous structure is formed through thermal machining, the good plasticity of the titanium alloy is kept, and meanwhile the strength of the titanium alloy is improved. And the yield strength and the tensile strength are obviously improved.

A method for fabrication of an anisotropic magnet comprises placing magnet alloy feedstock particles in a deformable metallic container and thermomechanically working the filled container in a manner to elongate the filled container and reduce its cross-sectional area to consolidate the magnet alloy particles to an elongated shape and impart a preferential grain texture to the consolidated, elongated shape. The consolidated, elongated shape is machined to a near-final magnet shape that has a smaller dimension such as magnet length and that includes a metallic tubular skin thereon.

The invention belongs to the technical field of nickel alloy treatment, and provides a thermomechanical treatment method for nickel alloy disc parts, which comprises the following steps: obtaining a nickel alloy blank, and heating to perform first thermomechanical processing to form a disc blank with an initial contour; the disc blank with the initial contour is heated to be subjected to first heat treatment; heating the disc blank subjected to the first heat treatment until the local part is subjected to second heat machining to form a disc blank close to the final outline; the disc blank close to the final contour is heated to be subjected to second-time heat treatment; and finally, plate blanks with different grain sizes in different areas are obtained. According to the method, under the condition that an over-solid-solution grain structure is obtained in the whole part, grains with larger sizes can be obtained locally.