869 results about "Solution treatment" patented technology

The invention discloses an Al-Mg-Zn aluminum alloy plate with excellent strong plasticity and light weight characteristics as well as a preparation method and application of the Al-Mg-Zn aluminum alloy plate. The alloy comprises the following components in percentage by mass: 5.0%-5.5% of Mg, 1.5%-2.0% of Zn, 0.4%-0.5% of Mn, 0.1%-0.3% of Cu, 0.15%-0.25% of Sc, 0.1%-0.15% of Zr, 0.05%-0.15% of Ag, less than or equal to 0.1% of impurities and the balance of Al. The density is not more than 2.63 g / cm < 3 >, the tensile strength is not less than 470 MPa, and the ductility is not less than 23%. The preparation method comprises the steps of high-purity raw material smelting and casting, two-stage homogenization, hot rolling, intermediate annealing, cold rolling, solid solution treatment and single-stage aging. Wherein the total pressing amount of hot rolling is 80-85%, the total pressing amount of cold rolling is 20-35%, and the single-stage aging time is 120-140 DEG C * 16-24 h. The microstructure of the alloy is characterized in that the average size of dispersed AlSc particles is smaller than or equal to 100 nm, the area fraction of deformed grains is larger than or equal to 70%, the average size of nanometer beta-AlMg and T-Mg (Al, Zn) composite precipitated phases is smaller than or equal to 20 nm, the number density is larger than or equal to 1 * 10 < m >, the area fraction of micron-order second phases is smaller than or equal to 0.5%, and the alloy is only formed by impurity Fe. According to the method, the traditional two-stage aging process is simplified, low density, high strength and high plasticity are synchronously improved, and the method is suitable for large-scale industrial application.

The invention relates to the technical field of alloy processing, and discloses a high-performance corrosion-resistant nickel-based alloy plate and a preparation method thereof, and the method comprises the following steps: raw material preparation, smelting treatment, casting treatment, hot rolling treatment, solution treatment, aging treatment and surface passivation treatment. According to the invention, when a composite acid system is adopted for passivation treatment, the concentration of chromium / molybdenum atoms in a passivation film is optimized and balanced due to the specific ratio of nitric acid to chromic acid, a chromium oxide provides a compact passivation barrier, and a molybdenum oxide endows the film layer with a self-repairing characteristic to synergistically inhibit pitting nucleation; meanwhile, nano titanium dioxide particles pretreated by silane are embedded into the passivation film in situ under the action of ultrasonic oscillation, organic pollutants adsorbed on a film layer can be decomposed by the photocatalytic characteristic of the nano titanium dioxide particles, the local corrosion effect of a battery caused by dirt coverage is avoided, and the performance of the battery is improved through double upgrading of components and the structure of the passivation film. And the alloy plate has excellent pitting corrosion resistance and fouling resistance in a chloride ion-containing medium.

The invention relates to the technical field of stainless steel pipe production, and provides a stainless steel seamless steel pipe production process which comprises the following steps: step 1, raw material pretreatment: selecting a stainless steel pipe blank conforming to specifications, detecting internal defects through ultrasonic flaw detection, and cleaning the surface of the pipe blank by adopting a shot blasting machine; 2, tube blank heating, wherein the tube blank in the step 1 is placed in a medium-frequency induction heating furnace to be heated; thirdly, hot extrusion forming is conducted, specifically, the pipe blank in the second step is placed in an extruding machine with an annular die head, and an initial seamless steel pipe is formed; and 4, on-line solid solution treatment is conducted, specifically, the steel pipe in the step 3 is fed into a continuous solid solution furnace to be subjected to heat preservation for 30-60 seconds. By means of the multi-link collaborative optimization production technology, high-quality batch production of the stainless steel seamless steel pipe and flaw detection and surface cleaning in the raw material pretreatment stage are achieved, the pipe blank quality is guaranteed, sectional type heating and precise temperature control hot extrusion forming are achieved, and the structural integrity of the initial steel pipe is guaranteed.

The invention relates to the technical field of stainless steel production and manufacturing, and discloses a high-strength corrosion-resistant duplex stainless steel shaft forging method which comprises the steps of blank preparation, homogenization treatment, preheating treatment, multidirectional forging, interrupted cooling, solution treatment, aging treatment and surface finish machining. Uniformity of components in the blank and consistency of temperature distribution are guaranteed, a uniform microstructure basis is provided for subsequent forging, meanwhile, grains are refined through large deformation and multi-pass deformation in multi-directional forging, the strength and toughness of the shaft are improved, brittle phase formation is avoided, and the mechanical property is optimized; by interrupting cooling and solution treatment, controlling the cooling rate and heating parameters in real time, inhibiting harmful phase precipitation and optimizing the austenite-ferrite phase proportion, the shaft has high corrosion resistance, and by means of aging treatment, through a stable structure, the long-term durability of the shaft in a severe environment is guaranteed, and the corrosion weight loss and pitting corrosion risk are reduced.

The invention relates to a preparation method of an aluminum alloy welding wire and a high-strength 7xxx aluminum alloy welding wire prepared thereof.The preparation method comprises the following steps that S1, an aluminum alloy cast ingot is cast, and the aluminum alloy cast ingot comprises, by mass, 7%-8% of Zn, 2.0%-2.3% of Mg, 1.2%-1.8% of Cu, 0.2%-0.3% of Sc, 0.2%-0.3% of Zr, 0.1%-0.2% of Er and the balance Al; s2, the aluminum alloy cast ingot is subjected to multi-stage homogenization treatment, hot extrusion treatment, solution treatment, cold drawing, three-stage annealing treatment, cold drawing, three-stage annealing treatment, cold drawing, scraping cleaning and drying; multi-element microalloying, deformation and heat treatment are combined, precipitation strengthening, fine grain strengthening, strain strengthening, element diffusion and segregation and the like are fully considered, the formability of the welding wire is improved while the components of the welding wire are guaranteed, the technological method is simple, and operation is convenient.

The invention relates to a machining method for a high-strength large thin-wall weak-rigidity aluminum alloy ring piece, and belongs to the technical field of machining. The aluminum alloy ring piece blank is subjected to solution treatment; the blank is subjected to bulging treatment; the bulged blank is subjected to artificial aging treatment; carrying out thermal vibration aging treatment on the aluminum alloy ring piece blank; rough machining is conducted on the aluminum alloy ring piece blank, and a workpiece of the aluminum alloy ring piece is obtained; performing primary destressing annealing heat treatment on the workpiece; carrying out primary semi-finishing on the workpiece; carrying out secondary destressing annealing heat treatment on the workpiece; carrying out secondary semi-finishing on the workpiece; carrying out first high-low temperature heat treatment on the workpiece; the workpiece is subjected to third-time semi-finish machining; performing secondary high-low temperature heat treatment on the workpiece; the workpiece is subjected to finish machining treatment, and an aluminum alloy ring piece product is formed; according to the method, the machining allowance is distributed, and various stress eliminating means are adopted, so that the performance and the size precision of the ring piece are guaranteed.

The invention discloses an aging treatment optimization method for inhibiting precipitation of a gamma2 phase in solid-solution-state duplex stainless steel. Aiming at the problems of excessive precipitation of a gamma2 phase and poor stability of a passivation film caused by the existing process (700 DEG C, 8-32 hours), the precipitation amount of the low-chromium gamma2 phase at the alpha / gamma phase boundary is reduced by shortening the aging time to 0.5-4 hours. The method comprises a solution treatment stage (1100 DEG C heat preservation for 2 hours and air cooling), an aging treatment stage (700 DEG C heat preservation for 0.5-4 hours) and furnace cooling. The pitting potential of the optimized material is remarkably improved, the corrosion current density is reduced, the pitting corrosion resistance is improved by 30% or above, meanwhile, complex equipment or alloy addition is avoided, and the method is suitable for industrial production. Experiments show that gamma 2 phase precipitation can be effectively inhibited within 4 hours of aging, the stability and chloride ion erosion resistance of a passive film are enhanced, formation of corrosion holes is reduced, and the service life of the material in nuclear energy, ocean and other environments is remarkably prolonged.

The invention provides a weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate and a preparation method, and relates to the technical field of design and preparation of new magnesium alloy materials. The magnesium alloy comprises the following components in percentage by mass: 1.081 to 1.215 percent of Al, 1.496 to 1.647 percent of Zn, 0.135 to 0.229 percent of Ca, 2.925 to 4.786 percent of Er and the balance of Mg and inevitable impurities. The preparation method comprises the steps of raw material weighing, raw material smelting solution treatment, clamping plate rolling and annealing treatment. According to the preparation method, the weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate is prepared through component regulation and control and process step control, the room-temperature comprehensive mechanical property and the room-temperature deformability of the weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate are synergistically improved, and the weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate has both strength and plasticity and is low in anisotropy; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention discloses a method for improving the thermal stability of a gradient nanocrystalline structure, and belongs to the technical field of metal material processing. According to the method, Mg-RE series alloy is used as a matrix, a matrix alloy ingot is heated for solution treatment, surface strengthening is carried out after water quenching and cooling, a gradient nanocrystalline layer is formed on the surface layer of an alloy sample, finally, the alloy sample is transferred into an aging oven for low-temperature aging, and cooling is carried out, so that the magnesium alloy is obtained. According to the method, the thermal stability of the magnesium alloy gradient nanocrystalline is improved through a synergistic strategy of component design and low-temperature aging, so that the grain growth rate of Mg-RE alloy gradient nanocrystalline structures treated by various different surface strengthening methods in a high-temperature environment can be remarkably reduced; the core bottleneck that a traditional magnesium alloy gradient nanocrystalline material is poor in thermal stability and single in applicable surface treatment method is solved; and the process does not need special equipment, can be seamlessly connected with various existing magnesium alloy surface strengthening production lines, and is low in process cost, simple and convenient to operate and easy to industrially popularize.

The invention discloses a preparation method of a corrosion-resistant and impact-resistant high manganese steel wear-resistant lining plate, and relates to the technical field of wear-resistant materials, the preparation method comprises the following steps: S1, weighing raw materials according to the mass percentage; s2, raw material smelting; s3, rare earth purification is conducted, specifically, rare earth elements are added into the molten-state raw materials, and the molten-state raw materials are subjected to deoxidation and desulfurization treatment; s4, casting molding is conducted, the temperature from the bottom end of a casting to a riser is controlled to be decreased stage by stage, and directional solidification is achieved; s5, heat treatment is conducted, specifically, the casting is subjected to solution treatment and then subjected to water quenching to the room temperature; and S6, surface treatment is conducted, specifically, shot blasting treatment is adopted, surface oxide skin is removed, and a surface compressive stress layer is formed. The strength, hardness and high toughness of the high-manganese steel are guaranteed by controlling the content of carbon and manganese, meanwhile, single-phase austenite is obtained through solution treatment, the hardness is improved through carbon atom segregation through low-temperature aging, and the strength, hardness, toughness and corrosion resistance of the high-manganese steel lining plate are improved.

The invention discloses a preparation method of a cast aluminum alloy, and belongs to the technical field of alloys. According to the method, ultrasonic field assistance is added, grains can be refined, aluminum alloy liquid can be promoted to be more uniform, segregation is reduced, a composite refining agent and a compound alterant are added, the purity of the aluminum alloy liquid can be obviously improved, the alterant is added step by step, and the alterant is more uniformly dispersed in the aluminum alloy liquid; the method comprises the following steps of: adding Al-5Ti-1B and nano CeO into eutectic silicon to convert the eutectic silicon into a fine fiber shape from a sheet shape, and adding Al-5Ti-1B and nano CeO after a period of time, so that grain growth can be inhibited, agglomeration is reduced, a synergistic effect is generated on the whole, grain refinement and form optimization of the eutectic silicon are realized, and a uniform microstructure is formed together; and through multi-stage solution treatment, the intracrystalline structure can be stabilized, and subsequent aging precipitation is promoted, so that a finer, more uniform and dispersed strengthening phase is obtained, and the balance of mechanical properties and corrosion resistance of the cast alloy can be achieved.

The invention discloses an ultrahigh-strength invar steel wire rod which comprises the following chemical components in percentage by mass: 0.24%-0.35% of C, 34.5%-39.5% of Ni, 1.1%-1.6% of Mo, 0.3%-0.9% of V, 0.25%-0.45% of Nb, 0.001%-0.045% of RE and the balance of Fe and inevitable impurities. The preparation method comprises the following specific steps: S1, preparing a steel ingot; s2, forging; s3, performing hot rolling to form a wire rod; s4, the wire rod is sequentially subjected to solution treatment; s5, carrying out primary cold drawing processing, and then carrying out low-temperature rapid aging heat treatment; s6, secondary cold-drawing processing and forming; by introducing an RE element into an invar material, the finally obtained invar wire has the properties of ultrahigh strength, low expansion coefficient and the like by means of the outstanding effects of the RE element in the aspects of inclusion modification and grain refinement, the tensile strength of the invar wire is larger than or equal to 1500 MPa, the thermal expansion coefficient of the invar wire at the room temperature to 230 DEG C is smaller than or equal to 2.5 * 10 <-6 > / DEG C, and the thermal expansion coefficient of the invar wire at 230-290 DEG C is smaller than or equal to 9.6 * 10 <-6 > / DEG C.

The invention discloses a neutron shielding magnesium alloy plate and a preparation method thereof, and relates to the technical field of magnesium alloy materials, and the neutron shielding magnesium alloy plate comprises the following components in percentage by mass: 5-20% of Gd, and the balance of Mg and inevitable impurities. The preparation method comprises the following steps: S1, preparing the raw materials of each component, and performing pretreatment; s2, all the component raw materials pretreated in the step S1 are molten, and then a melt is subjected to deslagging, casting and cooling treatment to obtain an as-cast magnesium alloy cast ingot; s3, the as-cast magnesium alloy cast ingot prepared in the S2 is cut into a magnesium alloy plate, solution treatment is conducted, and then water cooling is conducted; s4, grinding the surface of the magnesium alloy plate subjected to solution treatment in S3, and rolling; and S5, the magnesium alloy plate rolled in the step S4 is subjected to aging treatment, and the neutron shielding magnesium alloy plate is obtained.

The invention discloses a manufacturing process of an NO7718 nickel base alloy nut for nuclear equipment. The manufacturing process comprises the steps of material preparation, hot forging, shot blasting, solid solution heat treatment, physical and chemical detection, finish machining, precipitation hardening heat treatment and detection packaging. The hot forging near-net forming technology is adopted, the shape of the nut blank is directly obtained through plastic deformation, the cutting allowance of machining is greatly reduced, a large number of raw materials are prevented from becoming sweeps, the material utilization rate is remarkably increased, and the raw material cost is effectively reduced; by accurately controlling the initial forging temperature, the final forging temperature and the cooling speed of hot forging as well as subsequent solution treatment and precipitation hardening treatment, grains can be refined, and the precipitation form and distribution of a strengthening phase can be controlled, so that the microstructure of the material is optimized, and the material obtains more excellent comprehensive mechanical properties such as higher strength, plasticity and toughness cooperation; and the harsh working condition requirements of nuclear equipment can be better met. The process provided by the invention ensures the stability and consistency of product performance.

The invention provides an austenitic stainless steel casting in-situ microalloying modification method based on multi-field coupling and intelligent feedback. The austenitic stainless steel casting in-situ microalloying modification method comprises the following steps that S1, a casting mold is preset, and a machine learning model is deployed; s2, smelting and pouring a master alloy; s3, a microalloying agent is injected into the casting mold, and multi-field coupling treatment is conducted on molten steel; s4, casting microstructure evolution is predicted through a machine learning model, and injection parameters and multi-field coupling parameters of a microalloying agent are adjusted in real time; and S5, the solidified casting is subjected to solution treatment and aging treatment, and a final product is obtained. According to the invention, the microalloying process and the solidification process are synchronized, the multi-field coupling effect of a pulse electromagnetic field and an ultrasonic field is realized, and an intelligent feedback system driven by machine learning is introduced, so that the processing steps are provided, and a self-adaptive and self-optimized intelligent casting system is constructed; and a brand new technical path is provided for performance customization production of high-end castings.

The invention relates to the technical field of magnesium alloys, in particular to a low-density, high-modulus and ultrahigh-strength magnesium-based composite material and a preparation method thereof.The preparation method comprises the steps that SiC reinforcement particles are pretreated; the raw materials are proportioned according to the mass percent of the components of the magnesium alloy; melting pure magnesium, sequentially adding alloy elements, uniformly stirring, cooling to a semi-solid temperature interval, adding the pretreated SiC reinforcement particles, and casting in a preheating mold to solidify, so as to obtain a magnesium-based composite material cast ingot; the cast ingot is sequentially subjected to solution treatment and extrusion forming; carrying out secondary solution treatment on the magnesium-based composite material bar subjected to extrusion forming; and performing rotary swaging deformation and intermediate annealing treatment on the magnesium-based composite material bar subjected to secondary solution treatment to obtain the ultrahigh-strength magnesium-based composite material. Therefore, the problems that in the prior art, magnesium alloy is insufficient in strength and modulus, a magnesium-based composite material easily generates casting defects and is difficult to deform at room temperature, and the performance of the material is weakened due to grain growth during high-temperature deformation are solved.

The invention discloses a preparation method of a high-strength and high-conductivity aluminum alloy profile, which comprises the following steps: 1) carrying out solution treatment on an aluminum alloy raw material to obtain a supersaturated solid solution; (2) the supersaturated solid solution is subjected to low-temperature extrusion treatment, and the aluminum alloy profile is obtained; and thirdly, the aluminum alloy profile is heated, and the high-strength and high-conductivity aluminum alloy profile is obtained. According to the method, hot extrusion is replaced by low-temperature extrusion, so that the aluminum alloy profile generates a remarkable cold hardening effect, the strength of the alloy is greatly improved, meanwhile, severe plastic deformation at the extrusion temperature generates a large number of intragranular dislocations, Mg and Si elements are promoted to be quickly and fully dispersed and separated out, the alloy generates a precipitation strengthening effect, and the conductivity is improved.

The invention discloses a preparation method of a high-toughness beta titanium alloy wire. The preparation method comprises the following steps: providing a beta titanium alloy coiled wire; the coiled wire is subjected to multi-pass roller die hot drawing, and a first middle wire is obtained; performing eye mold hot drawing, sizing and rounding on the first middle wire rod to obtain a second middle wire rod; carrying out on-line short-time solution treatment on the second intermediate wire rod and cooling the second intermediate wire rod; performing eye mold hot drawing on the wire rod subjected to solution treatment to obtain a third middle wire rod; and the third middle wire rod is subjected to eye mold cold drawing, and the beta titanium alloy wire rod of the final specification is obtained. According to the preparation method of the high-toughness beta titanium alloy wire rod, the problems that crystal grains are coarse and large due to repeated solid solution of titanium alloy, sufficient precipitation behaviors cannot be obtained due to direct solid solution, the solid solution cold tensile strength is too high, the plasticity is low and cold plastic forming is difficult to achieve due to sufficient large deformation and cold deformation after solid solution, and the contradiction between the processing technology and the material performance is solved.

The invention belongs to the field of stainless steel. Specifically, the invention relates to Ti and Cu synergistically strengthened fine-grain high-toughness soft magnetic stainless steel and a soft magnetic stainless steel profile containing the Ti and Cu synergistically strengthened fine-grain high-toughness soft magnetic stainless steel. The soft magnetic stainless steel is composed of Cr, Cu, Mo, Ti, C, Fe and inevitable impurities. In the preparation process of the soft magnetic stainless steel profile, smelting is carried out according to the components, and technological parameters in all the procedures are strictly regulated and controlled through the procedures of solid solution, hot rolling, cold drawing, recrystallization annealing, aging and the like; and the prepared soft magnetic stainless steel profile is fine and uniform in structure, is jointly strengthened by micro carbide precipitation and high-density dispersion coherent nano precipitation phase, and has excellent low-temperature toughness and soft magnetic performance. The Ti and Cu synergistically strengthened fine-grain high-toughness soft magnetic stainless steel profile can be effectively applied to electromagnetic valves and related products which serve in a low-temperature medium and require certain strength and toughness, and has good popularization prospects and application value.

The invention discloses a processing method for solving grain growth in a solution treatment process of a high-temperature alloy, which comprises the following steps of: 1, obtaining a basic bar by adopting a hot working mode, specifically, carrying out forging cogging on a steel ingot, then carrying out hot working on the steel ingot through a fast forging machine or a rolling mill to obtain the required basic bar, and reserving a certain deformation amount; 2, stress relief annealing is conducted on the basic bar obtained in the step 1, and water cooling is conducted immediately after heat preservation is completed; 3, the bar obtained in the step 2 is subjected to cold drawing; and 4, the finished bar obtained after cold drawing is subjected to solution treatment. According to the method, firstly, residual cold deformation of the bar in the hot working process is eliminated through high-temperature stress relief annealing, then the bar reaches the specified size through cold drawing machining, the cold deformation of the bar is larger than critical deformation, finally, after standard solution treatment, grain structures of all parts of the bar are uniform, and abnormal growth of grains does not exist. The process has the advantages of environmental protection, convenience, flexibility and low cost.

The multi-stage heat treatment method for preparing the high-content strengthening phase superalloy based on 3D printing comprises the following steps that selective laser melting equipment is adopted, nickel-based superalloy powder serves as a raw material, layer-by-layer scanning melting forming is conducted according to a preset three-dimensional model, and a superalloy test block or component is obtained; and performing multi-stage heat treatment on the high-temperature alloy test block or component. According to the method, selective laser melting equipment is adopted for manufacturing a high-temperature alloy test block or component, then the high-temperature alloy test block or component is sequentially subjected to high-temperature homogenization treatment, high-temperature solution treatment, first-stage aging treatment and second-stage aging treatment, the gamma / gamma phase with high content and optimized morphology can be obtained, the performance potential of the 3D printing high-temperature alloy is fully played, and the production cost is reduced. The volume fraction of the gamma strengthening phase in the obtained high-temperature alloy is larger than or equal to 60%, the average size is 100-500 nm, the gamma strengthening phase is evenly distributed in a gamma matrix in a cubic or spherical mode, and the high-temperature alloy shows excellent mechanical performance in the temperature interval of 750-950 DEG C.

The invention relates to the technical field of seamless steel tube processing, and provides a processing technology of a high-temperature-resistant seamless steel tube, which comprises the following steps: blank preparation and pretreatment: preparing a stainless steel blank with the Cr content of more than or equal to 10.5% by adopting an electroslag remelting smelting technology, and carrying out high-temperature homogenization diffusion annealing on a cast ingot, and hot working forming is conducted, specifically, the pretreated blank is heated to 1080-1200 DEG C, perforating rolling is conducted through a three-roller skew rolling perforating machine, a thick-wall tubular billet is formed, online temperature control cooling, warm rolling and online solution treatment are conducted after perforating, and warm rolling is conducted on the thick-wall tubular billet within the range of Ac1 to 980 DEG C. By matching the electroslag remelting and high-temperature homogenization diffusion annealing process, element segregation and internal tiny defects of a casting blank are effectively reduced, the structure uniformity and purity of the blank are remarkably improved, the problem of insufficient structure uniformity in an existing process is solved from the source, and a basic guarantee is provided for excellent high-temperature performance and corrosion resistance of a product.

The invention discloses a manufacturing method of a partition piece, which comprises the following steps of: 1, selecting proper raw materials for blanking to obtain a blank; secondly, the blank is heated to the forging temperature; 3, pre-forging operation is conducted on the blank to form a pre-forged piece, finish forging operation is conducted on the pre-forged piece to form a finish-forged piece, die preheating is conducted before forging, and lubricating liquid is sprayed; fourthly, the forged final forging is subjected to solution treatment; 5, trimming of the final forging is cut off; 6, aging treatment is carried out; and step 7, carrying out post-treatment. According to the forging method, operation is easy, the manufacturing process is stable and reliable, the blank is subjected to two times of forging including pre-forging and finish forging, filling is complete during forging, the deformation quantity is small, and the forged partition piece is excellent in physical performance.

The invention discloses a magnesium-rare earth alloy with a grinding tooth-shaped interface structure and a preparation method and application thereof, and belongs to the technical field of magnesium alloy material processing. According to the magnesium-rare earth alloy with the meshed tooth-shaped interface structure, a W phase is directionally separated out around the boundary of an Al2 (Gd, Y) phase. The Mg-Gd-Y-Zn-Al alloy serves as a base, a high-modulus Al2 (Gd, Y) phase is introduced, directional precipitation of a W phase around the boundary of the Al2 (Gd, Y) phase is achieved through multiple times of ultrasonic vibration composite multi-axial vibration coupling and secondary solution treatment, the Al2 (Gd, Y) phase with a tooth-shaped microcosmic interface structure is constructed, compatible deformation with a magnesium matrix is achieved, the Al2 (Gd, Y) phase is refined through composite deformation machining, stress concentration is relieved, and the mechanical property of the alloy is improved. And meanwhile, the strength and plasticity of the alloy are improved through torsional deformation of the LPSO phase. Through the formation of the special microstructure, the high strength, the high modulus and the high ductility of the magnesium-rare earth alloy are synchronously improved.

The invention relates to the technical field of stainless steel heat treatment, in particular to a heat treatment method for improving the hydrogen embrittlement resistance of martensitic stainless steel, which comprises the following steps: a, solution treatment; the solid solution treatment comprises high-temperature solid solution treatment, low-temperature solid solution treatment and medium-temperature solid solution treatment which are sequentially carried out, so that the martensitic block interface proportion in the martensitic stainless steel is the maximum, and due to the fact that the orientation difference of the martensitic block interface is larger than that of other interfaces, more energy is needed when hydrogen-induced cracks penetrate through the type of interface, and the hydrogen-induced cracks are not prone to cracking. The martensite block interface has higher hydrogen capture capacity, the hydrogen embrittlement resistance of the martensite stainless steel is simply and effectively improved on the premise that material components are not changed, and the service life of the martensite stainless steel is guaranteed.

The application relates to a high-entropy alloy with excellent creep performance and a preparation method thereof. a Co b Cr c Ni d Ta p Al q M n wherein 10<=a<=20, 20<=b<=25, 10<=c<=20, 25<=d<=35, 5<=p<=10, 0<=q<=8 and 0<=n<=5. The preparation method comprises the following steps: allocating raw materials according to designed components, then carrying out smelting under a protective atmosphere, and then carrying out solid solution water quenching treatment + hot rolling treatment and again solid solution treatment, and then quenching after heat preservation at 750 DEG C to 950 DEG C. The product is obtained by reasonably regulating and controlling components, heat deformation and heat treatment processes. The product has a service life of 1245h under high-temperature creep conditions of 750 DEG C / 350MPa, is far higher than similar products, has a tensile strength of greater than 1.5GPa at room temperature, breaks through the bottleneck that Laves eutectic high-entropy alloys have no tensile plasticity at room temperature, and has a wide engineering application prospect.

The invention discloses a production method for improving the structure uniformity of a 304 austenitic stainless steel medium-thickness plate, belongs to the field of stainless steel production, and solves the problem that mixed crystal structures often appear in the structure of the 304 austenitic stainless steel medium-thickness plate produced by an existing method. The method comprises the following steps: producing a 304 austenitic stainless steel continuous casting sheet billet; the plate blank is heated for the first time, the temperature of a heating furnace is set to be 1280-1300 DEG C, the heating time is 300-360 min, and natural cooling is conducted; the plate blank is remelted, heated and rolled again, the heating temperature is set to be 1250-1270 DEG C, the heating time is 240-300 min, and the remelted and reheated plate blank is rolled to the target thickness; and solution treatment is conducted, the solution treatment temperature ranges from 1050 DEG C to 1080 DEG C, the solution treatment time coefficient ranges from 1.0 min / mm to 2.0 min / mm, and water cooling is conducted to the room temperature. The structure uniformity of the 304 austenitic stainless steel medium plate produced by the method is obviously superior to that of a traditional method.

This invention provides a magnesium anode material with a dislocation density gradient structure based on asynchronous rolling, its preparation method, and its application, relating to the field of anode material technology. The magnesium anode material of this invention is prepared by raw material melting and casting, solution treatment, extrusion molding, and asynchronous rolling. The magnesium anode material includes no more than 0.1 wt.% zirconium, with the balance being magnesium and unavoidable impurities. The dislocation density of the magnesium anode material increases gradient from the surface to the core. This invention introduces a dislocation density structure with a gradient from the surface to the core into magnesium alloy sheets through asynchronous rolling, thereby obtaining a magnesium anode material with both high discharge activity and good corrosion resistance, improving its overall discharge performance in magnesium-air batteries. The preparation process of the magnesium anode material of this invention is simple, highly controllable, and easy to scale up, possessing good industrialization potential.

This invention relates to the field of alloy technology, specifically disclosing a microalloyed copper alloy tube and its preparation process. The copper alloy tube is composed of the following components by mass percentage: Ni 0.05%-0.15%, Sn 0.05%-0.15%, Fe 0.01%-0.1%, P 0.02%-0.04%, with the balance being Cu and unavoidable impurities. The mass ratio of Sn to Ni is controlled between 0.5 and 3. It possesses a single face-centered cubic α-phase crystal structure, with an isometric grain ratio ≥85% in the microstructure and an average grain size of 10-20 μm. The preparation process achieves a three-dimensional strengthening effect of solution treatment, precipitation, and grain refinement. The product exhibits a tensile strength of 250-270 MPa, an elongation after fracture ≥45%, and a yield strength ratio of 0.32-0.36, combining high strength, low yield strength ratio, excellent machinability, and corrosion resistance. It is energy-efficient and easily mass-produced.

The application discloses a hot isostatic pressing diffusion connection synchronous aging treatment method for high-temperature alloy and copper alloy, relates to the field of dissimilar metal solid-phase welding, and can improve the strength of the high-temperature alloy, inhibit size distortion caused by stress change in the aging process, improve machining precision, shorten the process cycle of finished products and greatly improve production efficiency. Step 1: high-temperature alloy with a predetermined structure is prepared, and solid solution treatment is carried out; step 2: copper alloy with a predetermined structure is prepared, the surfaces of the high-temperature alloy and the copper alloy are polished smooth and cleaned; step 3: the copper alloy and the high-temperature alloy structure are attached to the surfaces to be connected, and vacuum sealing is carried out; step 4: the structure after sealing is sent into a hot isostatic pressing furnace to carry out hot isostatic pressing diffusion connection and in-furnace aging treatment, so that a final product is obtained. According to the hot isostatic pressing diffusion connection synchronous aging treatment method, the strength of the high-temperature alloy is improved, size distortion is inhibited, machining precision is improved, the process cycle of finished products is shortened, and production efficiency is improved.