18results 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 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 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.

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 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 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 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 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.

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.

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 discloses rolled copper foil for a flexible printed circuit board and a preparation method of the rolled copper foil. The rolled copper foil is prepared from the following components in percentage by mass: 0.002 to 0.005 percent of Ag, 0.01 to 0.1 percent of La, 0.01 to 0.05 percent of Ce, 0.05 to 0.25 percent of Nd, 0.01 to 0.1 percent of O and the balance of Cu and inevitable impurities. The rolled copper foil for the flexible printed circuit board solves the problems of low flexibility and high recrystallization temperature of the rolled copper foil for the flexible printed circuit board, and the comprehensive performance of the rolled copper foil is improved by optimizing new alloy components and a rolling process, so that the rolled copper foil is suitable for flexible and conductive circuit boards with high requirements.

The invention relates to the technical field of metal material plastic processing, and discloses a multi-pass spinning method for improving the strength of a high-strength aluminum alloy large-diameter thin-walled pipe, which comprises the following steps: carrying out thinning spinning on a pipe blank made of an aluminum alloy material, then carrying out recrystallization annealing at 400-450 DEG C, carrying out water quenching and cooling to the room temperature after heat preservation is finished, and carrying out heat preservation to obtain the high-strength aluminum alloy large-diameter thin-walled pipe. The thinning spinning step and the recrystallization annealing step are repeated for 1-5 times in total; carrying out solution treatment on the thinned pipe blank, firstly placing the pipe blank in a heat treatment furnace for heat preservation at 500-540 DEG C, and then carrying out water quenching and cooling to room temperature; the pipe blank obtained after solid solution is installed on a cylindrical core mold, then spinning is conducted, and the pipe blank is thinned to the needed wall thickness; and finally, carrying out artificial aging at 160-200 DEG C for 2-4 hours. The multi-pass spinning method is adopted, the strength of the aluminum alloy large-diameter thin-wall pipe is effectively improved, and the method is suitable for various aluminum alloy large-diameter thin-wall pipes in aerospace.

The invention relates to the technical field of aero-engine part manufacturing, in particular to a forging forming method for an aero-engine fuel pump shell. Comprising the following steps of S1, rough machining, S2, primary forging, S3, secondary forging, S4, secondary treatment, S5, tertiary forging and S6, tertiary treatment. According to the method, cracks and folding defects in the forging treatment process can be effectively removed through three times of forging and post-forging treatment, and the defects of corrosion spots, black spots, abnormal flower spots, peeling, bubbles, bruise and press-in objects can be effectively optimized.

The application discloses a composite post-processing method of an aluminum alloy solid-phase frictional additive component, which is suitable for heat-treatable strengthening aluminum alloys 2 series, 6 series and 7 series prepared by a solid-phase frictional additive method, and comprises preliminary cryogenic treatment, preliminary stress relief treatment, solid solution treatment, secondary cryogenic treatment, deep cryogenic deformation treatment, secondary stress relief treatment and aging treatment. The composite post-processing method can significantly reduce residual stress of the additive component, improve dislocation density of the component and refine grains by firstly performing cryogenic treatment before solid solution treatment and respectively performing cryogenic treatment and deep cryogenic deformation treatment before aging treatment, and is particularly suitable for short-process integrated rapid preparation of large-size complex aluminum alloy components.