41results about How to "Increase the dislocation density" patented technology

The invention discloses a method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention relates to plasticity-enhanced lead lanthanum zirconium tin titanate-based antiferroelectric ceramic and a preparation method thereof. The chemical formula of the zirconium tin lead titanate lanthanum-based anti-ferroelectric ceramic is (Pb < 0.975-x > La < 0.02 > Sr < x >) (Zr < 0.5 > Sn < 0.37 > Ti < 0.13 >) < 0.9975 > O < 3 >, x is smaller than or equal to 0.10; and sintering by adopting a flash sintering technology to prepare the plasticity-enhanced lead lanthanum zirconate tin titanate-based antiferroelectric ceramic. Wherein the initial electric field intensity is set to be 100-300 V / cm, and the temperature rise rate of the flash sintering furnace body is 5-15 DEG C / min; when the reading of the current detector reaches the order of magnitude of [mu] A, the electric field intensity is increased to 200-500V / cm; after the current density value reaches 10-30 mA / mm < 2 >, the stable current density is kept for 90-200 s; preferably, the temperature rise rate of the flash burning furnace body is 8-12 DEG C / min.

The invention relates to a coating-free laser shock peening method for improving the mechanical property of an AISI9310 gear steel material, and relates to the technical field of laser shock peening machining.The coating-free laser shock peening method for improving the mechanical property of the AISI9310 gear steel material comprises the following steps that an AISI9310 gear steel material sample to be peened is obtained; the AISI9310 gear steel material sample to be strengthened is pretreated and then fixed in a laser carrying platform clamp, the distance between a light source laser beam and the sample and the distance between a galvanometer and the sample are adjusted, and it is ensured that a laser spot is focused at the position to be strengthened. On the basis of a traditional laser shock peening technical method, the water-light coaxial laser beam design is innovatively adopted, an absorption protection layer is not arranged in the peening process, a coating-free laser shock peening mode is adopted, the mechanical property of the AISI9310 gear steel material is effectively improved, and the defects in the prior art are overcome.

The invention discloses nano TiC reinforced 316L stainless steel with excellent high-temperature mechanical property, the content of TiC in the nano TiC reinforced 316L stainless steel is 4-6wt%, TiC is added in the form of nano powder, and the preparation process comprises the following steps: adding nano TiC powder into stainless steel powder, uniformly stirring, and carrying out heat treatment to obtain the nano TiC reinforced 316L stainless steel. Nano TiC powder is evenly attached to the specific surface of 316L stainless steel powder through grinding of a ball mill, then the ground mixed powder is put into laser additive manufacturing equipment, the nano TiC reinforced 316L stainless steel is obtained through laser additive manufacturing, and the technological parameters of laser additive manufacturing are as follows: the laser power is 150-500 W, the scanning speed is 400-1400 mm / s, the interlayer spacing is 0.04-0.1 mm, and the layer thickness is 0.01-0.05 mm; in the additive manufacturing process, argon is adopted as protective gas. The 316L stainless steel with the excellent high-temperature mechanical property can be obtained only through the additive manufacturing machining method, the high-temperature mechanical property of the 316L stainless steel can be comparable with that of nickel-based alloy, and the use environment and the application range of the 316L stainless steel are greatly expanded.

The invention relates to the technical field of metal materials, in particular to a high-strength steel material for mine roadway support and a preparation method thereof, and the high-strength steel material comprises the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.15 to 0.45 percent of Si, 1.20 to 1.80 percent of Mn, 0.20 to 0.50 percent of Cu, 0.15 to 0.40 percent of Cr, 0.10 to 0.35 percent of Ni, 0.08 to 0.25 percent of Mo, 0.015 to 0.045 percent of Nb, 0.03 to 0.08 percent of V, 0.008 to 0.025 percent of Ti, 0.005 to 0.020 percent of RE and the balance of Fe. The preparation method comprises the steps of smelting and refining, continuous casting, heating, rough rolling, finish rolling, segmented controlled cooling and medium-temperature tempering (450-550 DEG C), R is larger than or equal to 620 MPa, A is larger than or equal to 18%, the yield ratio is smaller than or equal to 0.90, KV at 0 DEG C is larger than or equal to 100 J, and the deep-well high-stress roadway support is suitable for deep-well high-stress roadway support.

The invention provides a high-strength particle reinforced aluminum-lithium-based alloy as well as a preparation process and application thereof. The alloy comprises the following components in percentage by mass: 3.3 to 4.5 percent of Cu, 0.2 to 0.7 percent of Mg, 0.8 to 1.6 percent of Li, 0.2 to 0.8 percent of Ag, 0.2 to 0.6 percent of Mn, 0.01 to 0.2 percent of Zr, 0.2 to 0.6 percent of Zn, 0.1 to 0.8 percent of TiB2 and the balance of Al and inevitable impurity elements. The mass content of Ti is smaller than or equal to 0.15%, the mass content of Si is smaller than or equal to 0.1%, and the mass content of Fe is smaller than or equal The preparation of the aluminum-lithium alloy is realized through a method of combining a mechanical stirring and ultrasonic stirring composite refining process, extrusion / rolling and heat treatment, and the problem of performance reduction caused by TiB2 particle aggregation of the particle-reinforced aluminum-lithium-based alloy is effectively solved, so that the strength of the particle-reinforced aluminum-lithium-based alloy is improved, and the application range of the particle-reinforced aluminum-lithium-based alloy is expanded.

The invention belongs to the field of titanium alloy strengthening, and particularly discloses a titanium alloy preparation method for synergistically improving strength and plasticity and a titanium alloy, and the titanium alloy preparation method comprises the following steps: S1, carrying out heat treatment on the titanium alloy; s2, after the titanium alloy subjected to heat treatment is cooled to the room temperature, magnetic field treatment is conducted on the titanium alloy; and S3, aging treatment is conducted on the titanium alloy subjected to magnetic field treatment. According to the method, heat treatment, magnetic field treatment and aging treatment are combined, aging strengthening and the magnetoplastic effect are comprehensively utilized, the strength and plasticity of the titanium alloy are synergistically improved, the titanium alloy with matched toughness performance is further prepared, and the requirements of high-end equipment and the industrial field for the titanium alloy are met.

The invention relates to the technical field of metal materials, and discloses a preparation process for a high-strength seamless steel pipe perforation plug. A large number of mechanically inhomogeneous bodies of hard particles are distributed on a ceramic reinforcing agent matrix, which generates contact and friction with a crack surface, so that the crack produces a closing effect and passivates the crack tip, thereby reducing the tendency of the plug to crack. The rare earth elements in the fine-grained reinforcing agent are dispersed in the crystal and at the grain boundary, which can effectively hinder the movement of dislocations, adsorb impurity elements such as oxygen and sulfur between crystals, purify the grain boundary and improve the strength of the alloy, and play a "pinning" role on dislocations during deformation. Ion soft nitriding can increase the dislocation density of the material and improve the hardness. The silicon zirconium coating has excellent wear resistance, and magnetron sputtering sputters the silicon zirconium coating material on the surface of the plug substrate to form a silicon zirconium nitride coating with a diffusion barrier effect with the nitrogen element on the substrate surface, thereby improving the strength and wear resistance of the perforation plug material.

This invention discloses an aluminum foil for a negative electrode current collector in sodium-ion batteries, which is prepared by pressing a pre-treated aluminum foil coating with an adhesive. The pre-treated aluminum foil comprises the following percentages of raw materials: Cu: 0.15-0.18%, Fe: 0.50-0.70%, Si: 0.20-0.30%, Mn: ≤0.01%, Mg: ≤0.01%, Ti: ≤0.03%, with the balance being Al and other unavoidable impurity elements. By limiting the types and contents of the components and performing intermediate annealing after rough rolling, internal stress defects generated during rolling are eliminated, effectively improving the uniformity of the alloy structure. After casting, intermediate annealing, and cold rolling, combined with subsequent rolling passes, the dislocation density of the aluminum foil can be increased, thereby solving the problems of easy breakage and difficult processing of lithium battery aluminum foil.

The invention provides a method for improving the corrosion fatigue performance of aluminum and / or magnesium alloy by combining laser peening with peak aging and an aluminum and / or magnesium alloy finished product. The method comprises the following steps: S1, carrying out solution treatment on to-be-treated aluminum and / or magnesium alloy; s2, the aluminum and / or magnesium alloy subjected to solution treatment is subjected to laser shot peening treatment; and S3, the aluminum and / or magnesium alloy subjected to laser peening treatment is subjected to peak aging treatment. According to the method, the initial nanometer precipitated phase can be dissolved through the solid solution treatment to form a single-phase supersaturated solid solution, dislocation pinning can be effectively promoted through the laser shot peening treatment, more and more stable gradient dislocation structures are reserved in the subsequent peak value aging process of the aluminum and / or magnesium alloy, power is provided for nucleation and growth of the nanometer precipitated phase, and the mechanical property of the aluminum and / or magnesium alloy is improved. And a surface layer overaging state-core peak aging state continuous transition structure is constructed in combination with subsequent peak aging treatment, and the continuous transition structure endows the aluminum and / or magnesium alloy with corrosion fatigue resistance and high strength characteristics.

The invention discloses a light-weight anti-radiation metal nano material for an SAR load and a preparation method of the light-weight anti-radiation metal nano material, and relates to the technical field of metallurgy. The preparation method comprises the following steps: firstly, adding a filler formed by compounding graphene and silicon dioxide into a metal material, reacting titanium dioxide with an aluminum base during high-temperature calcination to deoxidize to generate a silicon semiconductor, and forming a doped structure with graphene. Nanometer TiC-TiB2 particles are introduced into molten steel through aluminum-based intermediate alloy, in the solid-state phase change process, fine primary austenite, increased grain boundaries and nanometer particles can provide more nucleation sites for ferrite and cementite to be combined with graphene and silicon semiconductors, as-cast and annealed structures are further refined, and the density of metal is reduced. And then the nano-particles in the carbon steel are strengthened by using an ultra-fast cooling technology, so that the nano-scale cementite particles are dispersed more uniformly in the whole structure. The metal nano material prepared by the method has the effects of light weight and radiation resistance.

The invention discloses a corrosion-resistant and high-performance aluminum alloy cable material as well as a preparation method and application thereof, and relates to the technical field of aluminum alloy preparation. The component formula of the conductor is Al-xMg-ySi-zNi-mCe-nSc-qY, x is larger than or equal to 0.05 and smaller than or equal to 0.3, y is larger than or equal to 0.6 and smaller than or equal to 1.4, z is smaller than or equal to 0.35, m is larger than or equal to 0.01 and smaller than or equal to 0.2, n is larger than or equal to 0.03 and smaller than or equal to 0.2, q is larger than or equal to 0.04 and smaller than or equal to 0.1, iron is a main impurity element in the alloy, and the content of the iron is not larger than 0.1%. The aluminum alloy cable material with excellent mechanical properties (the tensile strength is larger than or equal to 122 MPa, and the elongation is larger than or equal to 14%), electrical properties (the conductivity is larger than or equal to 62% IACS) and corrosion resistance (the maximum IGC depth is smaller than 100 micrometers) is prepared by adopting the technological method of flame direct injection smelting, synchronous water quenching pull casting, cold forming machining and non-isothermal aging synchronous heat treatment, and the aluminum alloy cable material is suitable for aluminum alloy cables. The method is short in technological process, good in cable quality, high in corrosion resistance and wide in application prospect.

The invention discloses a metal oxide embedded carbon nanotube nano flexoelectric material and a preparation method and application thereof, and the preparation method comprises the following steps: opening a carbon nanotube to obtain an opened carbon nanotube; mixing the open carbon nanotube, hydrolytic salt and water to obtain a hydrolytic salt carbon nanotube solution; carrying out vacuum filtration on the hydrolytic salt carbon nanotube solution, and drying to obtain a hydrolytic salt embedded carbon nanotube material; and carrying out annealing treatment on the hydrolyzed salt embedded carbon nanotube material to obtain the metal oxide embedded carbon nanotube nano flexoelectric material. According to the preparation method provided by the invention, the carbon nanotube confinement space is utilized, the preparation of the nanoscale built-in stress gradient flexural dielectric material is realized, the geometric necessary dislocation density is increased by utilizing the size effect, the flexoelectric effect is amplified, and the application of flexoelectricity in the aspects of organic matter catalytic degradation and energy collection is improved.

The invention discloses a metal sample chip pre-freezing sample preparation method. The method comprises the following steps: S1, pre-freezing treatment; the method comprises the following steps: firstly, uniformly mixing metal sample chips, dividing and putting the metal sample chips into a sample container, then pouring liquid nitrogen into the sample container or putting the sample container into low-temperature refrigeration equipment, and carrying out ultralow-temperature freezing pretreatment on the metal sample chips to obtain a pre-frozen sample; s2, cutting and sieving; starting a sampling machine to idle, and then pouring the pre-frozen sample into the sampling machine for cutting, crushing and screening to obtain an oversize sample and an undersize sample; s3, sample preparation and sealing; uniformly mixing and dividing the sample into four parts according to a quartering method to obtain a metal sample, and sealing and storing the metal sample with aluminum foil bags respectively. According to the method, the metal sample scraps are subjected to ultralow-temperature freezing pretreatment before sample preparation, the dislocation density of the metal sample scraps is increased, dislocation is difficult to move under the ultralow-temperature effect, stress is no longer relieved through plastic deformation when metal is subjected to external force, brittleness is enhanced, brittle fracture is easier to occur, and the sample preparation efficiency and the sample preparation quality are improved.

The invention relates to a flexible constantan thin film thermoelectric device with high power density and a preparation method and application thereof, the flexible constantan thin film device is formed by connecting a plurality of n-type constantan thin film supporting legs in series through copper wires, and the n-type constantan thin film supporting legs are composed of Cu55Ni42Mn3. Compared with the prior art, the preparation of the flexible thermoelectric thin film device utilizes the constantan metal bond connection characteristic, the constantan thin film material with the micron-order thickness is obtained through the rolling technology, the texture orientation with the optimal elastic modulus and the high dislocation density are achieved, the flexible thermoelectric thin film device has the excellent flexibility and elasticity, the preparation technology is simple, and the preparation cost is low. The assembled 10-leg flexible thermoelectric thin film device is far superior to a currently reported flexible thermoelectric device in the aspects of power density and bending flexibility. The metal film thermoelectric device overcomes the inherent rigidity of an inorganic thermoelectric material, has the characteristic of high power factor of constantan, and shows that the metal material has potential in the aspect of application of the flexible thermoelectric device.

The present application relates to the technical field of titanium-based cathode roller, in particular to a large-size titanium-based cathode roller and a processing technology thereof, comprising the following processes: step one, taking a blank to carry out high-temperature blooming upsetting, punching, hole expanding, mandrel drawing, and obtaining a ring blank; step two, taking the ring blank obtained in step one to perform dressing and marking inspection; step three, taking the ring blank obtained in step two to perform turning, and obtaining a ring piece; step four, taking the ring piece obtained in step three to perform post-processing, and obtaining a cathode roller. The present application uses a new technology of forging-rolling combination to successfully produce a whole seamless ring piece at one time, which can effectively meet the requirements of the cathode roller on the morphology and mechanical properties at the microstructure level, and eliminate the occurrence of periodic bright band during the production of copper foil by the customer.

The present application discloses a cold-rolled steel strip production and manufacturing process, which relates to the field of metallurgical technology, and comprises the following steps: S1, heating the steel strip blank, and then performing rough rolling and finish rolling to obtain a hot-rolled plate; S2, pickling the hot-rolled plate and then performing cold rolling to obtain a cold-rolled plate; S3, annealing the cold-rolled plate to obtain a pre-treated steel strip; S4, deforming the pre-treated steel strip; and simultaneously rapidly cooling the pre-treated steel strip by steam jet; S5, performing dislocation pinning strengthening treatment on the cooled pre-treated steel strip, performing flattening treatment after the dislocation pinning strengthening treatment, and then performing an electrogalvanizing layer; the combination of deformation treatment and rapid cooling can shorten the production cycle and improve production efficiency, because rapid cooling can quickly reduce the temperature of the material, reduce the waiting time for material cooling, and increase the number of natural dislocations and increase their uniformity in the steel strip.

The invention discloses a preparation method of a medical pure magnesium bar with both strength and plasticity, which specifically comprises the following steps: carrying out room temperature extrusion treatment on a pure magnesium ingot, and carrying out rapid cooling treatment on the bar obtained after extrusion to obtain the pure magnesium bar, wherein the temperature of an extrusion container in the extrusion equipment is set to be higher than 150 DEG C, and the temperature of the pure magnesium ingot and the temperature of the die before extrusion are both room temperature; the medium temperature for cooling treatment is 0-5 DEG C;

The invention belongs to the field of numerical analysis of plastic forming, and particularly discloses a large-size grain crushing and refining unified constitutive model and a construction method thereof.The construction method comprises the steps that a sample is subjected to a multi-pass thermal compression simulation experiment, and a true stress-strain curve and microstructure data, namely standard values, are obtained; establishing a large-size grain crushing and refining unified constitutive model which comprises a grain crushing critical condition, a grain crushing degree evolution model, an equivalent shear strain evolution model, a dislocation density evolution model and a grain size evolution model; the critical condition of grain crushing is as follows: when the accumulated shear strain exceeds the critical shear strain, the grains are crushed, and the accumulated shear strain is determined according to the direction change of the loading shaft; and constructing a target function based on the deviation between the standard value and the simulation value, and solving through a genetic algorithm to obtain unified constitutive model parameters. The invention provides a solution for microstructure prediction, mechanical property control and processing technology formulation of the large-size grain alloy hot working blank.

The invention discloses an Al-Mg-Sr alloy material, an Al-Mg-Sr alloy plate and a preparation method of the Al-Mg-Sr alloy plate. The Al-Mg-Sr alloy material comprises the following components in percentage by weight: 0.1 to 0.5 percent of strontium, 4.0 to 4.9 percent of magnesium, 0.4 to 1.0 percent of manganese, 0.05 to 0.25 percent of chromium, 0.01 to 0.03 percent of titanium, inevitable impurities and the balance of aluminum, and the total content of the inevitable impurities is less than or equal to 0.05 percent by weight. The strontium element is added into the aluminum-magnesium alloy, the mechanical property of the prepared novel Al-Mg-Sr alloy is further improved by using the modification principle and the grain refinement effect of strontium, the corrosion resistance of the novel Al-Mg-Sr alloy is remarkably enhanced, and the aluminum alloy can be promoted to be widely applied to ships and warships.

The invention relates to a preparation method of a graphene reinforced aluminum-based composite material, in particular to a preparation method of a graphene reinforced aluminum-based composite material assisted by a nano reinforcement. The problems that in an aluminum-based composite material, the graphene dispersion effect is poor, and the matrix strength is not matched with the graphene strength are solved. The nano particles are introduced, the graphene is crushed, thinned and dispersed in the ball milling process, the effect far exceeding that of conventional millimeter-level ball milling balls is achieved, and dispersion of the graphene in a matrix is assisted; and the nanometer reinforcement is introduced into matrix crystal grains, the dispersion strengthening effect is achieved in a matrix, the strength of the matrix is enhanced, the strength of the matrix is matched with the strength of graphene, and a better effect is achieved in load transmission. Zero-dimensional and two-dimensional cooperation of variable and rigid reinforcements is achieved, the synergistic effect is obtained, the preparation process is simple and convenient, parameters are controllable, the cost is low, the performance is excellent, and a breakthrough is achieved compared with an existing graphene / aluminum preparation process.

The application discloses a low-density corrosion-resistant thin-gauge high-aluminum medium-manganese steel, and chemical components and mass percentages of the low-density corrosion-resistant thin-gauge high-aluminum medium-manganese steel include the following: C: 0.1-0.4%, Mn: 3-12%, Al: 2-5%, and the balance of Fe and inevitable impurities. The application has the advantages that a stirring friction processing method is used to introduce a microstructure feature of a phase and a grain size in a matrix in a gradient distribution into the medium-manganese steel, so that the surface modification purpose is achieved, and then the corrosion resistance is effectively improved.

The invention discloses a preparation method of a magnesium alloy bar with high rare earth element content and isomerism in strength and plasticity tension and compression, which comprises the following steps of: weighing components according to a designed magnesium alloy component proportion, smelting and casting magnesium, a magnesium-gadolinium intermediate alloy, a magnesium-yttrium intermediate alloy, silver, a magnesium-zirconium intermediate alloy and a magnesium-neodymium intermediate alloy in sequence under an SF6 (sulfur hexafluoride) protective atmosphere to obtain a magnesium alloy bar with high rare earth element content; a cast ingot is obtained; and the cast ingot is subjected to homogenization treatment and continuous extrusion, and the magnesium alloy bar is obtained. The tensile yield strength of the alloy bar prepared by the method can reach 288MPa at room temperature, and the percentage elongation after fracture can reach 19.0%; and the room-temperature compression yield strength reaches 266 MPa, the percentage elongation after fracture can reach 18.2%, and good tension and compression homogeneity is achieved.

The invention discloses a high-strength plasticity and high-extrudability aluminum alloy and a production process thereof, and belongs to the technical field of aluminum alloy production. The aluminum alloy comprises the following elements in percentage by mass: 0.8-1.4% of Si; 0.8 to 1.4 percent of Mg; 0.20% to 0.70% of Cu; 0.0 to 0.2 percent of Y; 0.0 to 0.2 percent of Er; 0.02 to 0.3 percent of Zr; ti: 0.05 to 0.25%; and the balance of Al and inevitable impurities. By adjusting the content proportional relation of main alloy elements such as Si, Mg and Cu, optimizing the extrusion process and the secondary aging process, properly reducing the total content of the alloy elements, improving the homogenization treatment temperature and time, reducing the extrusion temperature and increasing the dislocation density in an extruded profile matrix, the ductility of the profile can be effectively improved through high-density dislocation, and the tensile strength of the profile is improved. And through solid solution and secondary aging, precipitation of a precipitation phase in a matrix is promoted, growth of the precipitation phase is prevented, and the purpose of improving the plasticity of the alloy is achieved.

This invention discloses a high-strength, high-ductility, low-density steel and its preparation method. The composition is: C: 0.85–1.15%, Mn: 9.5–12%, Al: 8.5–11.5%, Ni: 2.5–3.5%, Cr: 2–3%, V: 0.3–0.5%, S≤0.005%, P≤0.008%, iron, and unavoidable impurities. The preparation method includes smelting, casting, forging, hot rolling, cold rolling, and recrystallization annealing processes. Through a high-C, medium-Mn, and high-Al synergistic design, Cr suppresses grain boundary carbide segregation, Ni promotes the formation of the B2 ordered phase, and V microalloying promotes the precipitation of the VC precipitate, forming a multi-scale layered structure composed of banded δ-ferrite, equiaxed (Fe,Ni)Al-type B2 phase, austenite, and nano-VC precipitates. The recrystallization annealing process achieves multi-scale layered structure control and synergistic strengthening of equiaxed (Fe,Ni)Al-type B2 phase and VC nanoprecipitates through rapid heating-short holding-rapid cooling. This invention breaks through the bottleneck of balancing strength, plasticity, and density in low-density steel, providing a high-performance material solution for automotive lightweighting.

The present application belongs to the field of micro-manufacturing, and in particular, relates to a segmented electroplating method for a metal microstructure mold core. In view of the problems of poor microstructure replication quality, severe warping deformation, uneven thickness distribution, and low electroplating efficiency that are easily generated during the electroplating process of the metal microstructure mold core, the relationship between power supply parameters and microstructure molding, internal stress, and electric field shielding and thickness distribution uniformity are established respectively. The electroplating process is systematically divided into three sections, corresponding to the microstructure layer, transition layer, and base layer of the mold core. Appropriate electroplating process parameters are used in each section to determine the thickness of each layer and the current switching method at the segment, so as to achieve efficient and high-quality molding of the metal microstructure electroplating mold core.

The invention discloses a metal 3D printing method and device, and relates to the technical field of 3D printing. The metal 3D printing method comprises the following steps: melting metal powder on a metal substrate by adopting a continuous laser beam emitted by a continuous laser to form a first cladding layer of at least partial area; and impacting the first cladding layer by adopting a pulse laser beam emitted by a pulse laser, and melting at least part of thickness of the first cladding layer to form a first metal layer. According to the embodiment of the invention, the pulse laser is used for carrying out laser shock on the first cladding layer, shock waves generated after high-temperature ionization enable the first cladding layer to generate plastic deformation, residual stress in the first cladding layer is reduced, dislocation density is increased, grains of a surface material are refined, and the surface of the formed first metal layer is smooth.

This invention discloses a high-saturation magnetization copper-iron alloy material, its preparation method, and its applications, belonging to the field of copper-iron alloy technology. The high-saturation magnetization copper-iron alloy material has an Fe content of 15-30 wt.%, with the balance being Cu and unavoidable impurities. The preparation method employs a composite processing system combining equal channel angular extrusion (ECAP) pre-processing and multi-stage variable temperature rotary forging, achieving simultaneous improvement in alloy strength, conductivity, and saturation magnetization within a short processing time. The Cu-Fe alloy prepared by this invention can achieve a saturation magnetization of over 70 emu / g, while also exhibiting good strength and conductivity. Furthermore, the experimental scheme is simple and easy to operate. These advantages effectively reduce the size of power electronic components and improve their stability during operation, meeting the development needs of the power and electrical industry.

The invention relates to a method for manufacturing a GH696 alloy high-performance cold-drawn material, and belongs to the technical field of metal processing. The GH696 alloy is an aging strengthening type high-temperature alloy and is mainly used for manufacturing fasteners, and a traditional production process of the GH696 alloy is difficult to meet the requirement that the tensile strength is larger than 1600 MPa in some special industries. Therefore, the invention provides a manufacturing method combining cold drawing deformation and heat treatment so as to improve the tensile strength of the alloy, and the specific manufacturing method comprises the following steps: firstly preparing a GH696 alloy bar, carrying out cold drawing after turning treatment, then carrying out aging heat treatment in a heat treatment furnace, and finally improving the material quality through straightening and polishing procedures. Experimental results show that the tensile strength of the cold-drawn material produced by the method is obviously superior to that of the cold-drawn material produced by a traditional method, and the problem of insufficient tensile strength in the prior art is solved. The manufacturing method provided by the invention provides effective technical support for popularization of the GH696 alloy in the high-strength application field.

The invention relates to a preparation method of microalloyed steel, and belongs to the technical field of metallurgy. The preparation method of the microalloyed steel comprises the following steps: S1, heating the microalloyed steel; s2, after heating is completed, the microalloyed steel is cooled; and S3, after cooling is completed, compression deformation is conducted on the microalloyed steel, and water quenching is conducted to 20-40 DEG C. According to the preparation method, the total dependent variable required in actual production is achieved through a single-pass compression process with a certain deformation quantity, meanwhile, heat preservation treatment is performed, the traditional test procedure is simplified, and the preparation method has a good application prospect in research on the precipitation mode of the deformation quantity on austenite grains and second-phase particles and the interaction effect of the second-phase particles and recrystallization. Through the preparation method, possible results can be tested with low cost and high efficiency.