53results about How to "Tissue uniform refinement" patented technology

The invention discloses high-carbon microalloy round steel for a fracture splitting connecting rod of an automotive engine and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.60 to 0.80 percent of C, 0.17 to 0.37 percent of Si, 0.30 to 0.90 percent of Mn, 0.020 to 0.60 percent of P, 0.050 to 0.080 percent of S, 0.015 to 0.0300 percent of N, one or several of microally elements V, Nb, Ti and B, and the balance of Fe and inevitable impurities. The production method of the high-carbon microalloy round steel comprises: (1) steel tapping by high catching carbon; (2) vacuum degassing (VD) vacuum treatment; (3) treatment in ladle furnace (LF); (4) execution of a continuous casting process; and (5) heating and rolling of continuously cast blank, and execution of a segmental cooling process of high-temperature quick cooling and low-temperature slow cooling. The high-carbon microalloy round steel provided by the invention has the characteristics of high cleanness, small composition segregation, low crack sensitivity, uniform and fine texture and high surface quality, and the provided production method has the characteristics of low production cost, energy conservation, simple process route, high maneuverability and simplicity of control.

The invention discloses clean steel and its manufacturing method, which comprises the following parts: C<=0.0030%, Si<=0.0030%, 0.10%-0.30%Mn, P<=0.0030%, S<=0.0030, 0.01%-0.06%Al, Ti<=0.09%, Nb<=0.05%, N<=0.0030%, O<=0.0030%, H<=0.0002%, Fe and unavoidable impurity. The method comprises the following steps: desulfurizing hot iron; bessemerizing; refining outside the furnace; casting the middle sheet plate blank continuously; loading hotly and directly; heating the furnace; roughing down; planishing; cooling lamellar flow; batching; cleaning with acid ; rolling coldly; annealing ( flattening; shearing ). The invention reduces the inclusion content in the steel by controlling the proper content of C, Mn, P, S, N, O, and H, which makes the inclusion shape fine and dispersing, the composition homogeneous and the structure homogeneous, and guarantees the integrated property.

The magnesium alloy electromagnetic low-temp. semicontinuous casting method includes the steps of melting magnesium, adding compound fire-resisting elements, adding alloy elements, heat-insulating, standing still and semicontinuous casting under the electromagnetic field. It utilizes the addition of compound fire-resisting elements to implement smelting of magnesium alloy free from coverage or protection so as to shorten technological process and raise melt quality, and utilizes the application of electromagnetic field and optimization of crystallizer structure to implement the low-temp. and high-speed semicontinuous casting of magnesium alloy.

The invention relates to an oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique. The alloy comprises the following components by weight percent: 6-13% of Gd, 2-6% of Y, 0.3-0.8% of Zr and the balance of Mg and irremovable impurity elements. The technique comprises the steps of melting magnesium ingots, adding solvents, adding alloy elements, refining, degassing, removing impurities, preserving heat and standing, and semicontinuously casting under the low casting speed by using a counter-pressure gas fluid-guiding method at low temperature and under low cooling speed. In the invention, technique parameters such as the casting temperature, the cooling speed, the ingot pulling speed, the inner liquid level height of a crystallizer, and the like are controlled to obtain the oversized high-strength magnesium alloy ingot blank with flat and smooth surface, refining and uniform tissue and no solute segregation, and the diameter of the ingot blank is from 220 mm to 505 mm. The length of the ingot is 1000-5000 mm. The invention meets the requirements for the oversized ingot blank required by high-strength heatproof magnesium alloy materials in the fields of aerospace, information electronics, communications and transportation, and the like.

The invention provides a clean steel smelting method of an anti-S steel oil well pipe, which relates to a smelting and preparing technology of an oil well pipe blank used in a corrosive oil-gas fieldenvironment. Clean steel comprises suitable chemical compositions by weight percent: 0.20-0.35 percent of C, not more than 1.00 percent of Si, not more than 0.60 percent of Mn, not more than 0.015 percent of P, not more than 0.010 percent of S, not more than 1.50 percent of Cr, 0.15-1.0 percent of Mo, 0.01-0.06 percent of Als, not more than 0.09 percent of Ti, not more than 0.05 percent of Nb, notmore than 0.0030 percent of N, not more than 0.0030 percent of O, not more than 0.0002 percent of H and Fe and the balance of unavoidable impurities. The clean steel smelting method adopts the following production technical lines by aiming at the clean steel with the compositions: choosing matching materials; smelting in an arc furnace; refining in an LF furnace; refining in a VD furnace; continuously casting in an arc shape; controlling hydraulic pressure and casting in full protection. The clean steel smelting method reduces the impurity content in the steel by controlling the proper content of C, Mn, P, S, Cr, Mo, N, O, H, and the like, the impurities are smaller and dispersive by the control of a subsequent technology, the component distribution is more uniform, tissues are evenly thinned, and the combination property of the anti-sulfur oil well pipe is ensured.

The invention relates to a production method of an NAK80 high-grade mirror surface plastic rubber mold material for a mobile phone mold. The method includes the steps of: batching, electric furnace smelting, vacuum refining, vacuum pouring, electrode billet forging, electroslag remelting, square steel forging, normalizing and hydrogen diffusion annealing, and pre-hardening heat treatment. The method provided by the invention overcomes the disadvantages that the processability, polishing performance and use performance of domestic NAK80 plastic rubber mold materials cannot meet the requirement of an A2 level mirror surface for the mobile phone mold, and provides the production method of the NAK80 high-grade mirror surface plastic rubber mold material for the mobile phone mold. The produced mold material has a pure inside and uniform microstructure, and processing and polishing verification prove that the processability, polishing performance and use performance of the mold material all meet the A2 level mirror surface requirement.

The invention discloses a high-entropy-alloy-based self-lubricating composite and a preparation method thereof. The preparation method of the high-entropy-alloy-based self-lubricating composite includes the steps that a four-element high-entropy alloy CoCrFeNi is used as a matrix, a solid lubricant is used as a lubricating phase, the CoCrFeNi and the solid lubricant are ball-milled and mixed and then deposited on a metal substrate through cold spraying to form a sedimentary body, the sedimentary body is subjected to friction stir machining through a stirring head, and the high-entropy-alloy-based self-lubricating composite is obtained, wherein the mass ratio of the CoCrFeNi to the solid lubricant is (2.3-4):1. According to the self-lubricating composite, the high-entropy alloy CoCrFeNi isused as the matrix, excellent mechanical performance of the high-entropy alloy overcomes losses of strength and toughness caused by adding of the solid lubricant, and therefore the prepared high-entropy-alloy-based self-lubricating composite keeps good self-lubricating capacity and has excellent mechanical performance.

The invention discloses a forging and heat treatment method of a 9Cr18MoV steel forging. The forging and heat treatment method comprises the following steps: a 9Cr18MoV steel ingot is put in a heat treatment furnace for performing the heat treatment before the forging, and is forged to produce a blank within a certain temperature range after the heat treatment; the 9Cr18MoV steel blank is finally forged within the certain temperature range to obtain the 9Cr18MoV steel forging; the normalization heat treatment is performed for the 9Cr18MoV steel forging; and the tempering heat treatment is performed for the 9Cr18MoV steel forging. The 9Cr18MoV steel forging has excellent corrosion resistance through reasonably controlling various process parameters, so that the 9Cr18MoV steel forging can be successfully applied to the production of such parts as gas turbines.

The invention discloses a processing technology of a chromium-zirconium-copper contact wire for a high-speed electrified railway. The method specifically comprises the following steps: upward continuous casting of a chromium-zirconium-copper rod blank, continuous extrusion, solid solution heat treatment, continuous rolling, aging heat treatment, peeling and drawing to obtain a finished product. According to the process, large-length and large-piece-weight industrial production of the chromium-zirconium-copper contact line of the high-speed railway is realized. The product performance is more excellent. The material structure is further refined and uniform through continuous extrusion and rolling. The average grain size is 10-50 [mu]m, the mechanical performance of the material is further improved, the tensile strength Rm reaches 600 Mpa or above, the conductivity is 80% IACS or above, the advantages of being stable and excellent in quality, high in material utilization rate and the like are achieved, a new way is provided for domestication of the chromium-zirconium-copper contact wire, and the method is suitable for wide popularization.

The invention discloses a production method for improving the wear resistance of plasma arc surfacing, which relates to the improvement of a welding processing method of plasma arc surfacing. Based on common surfacing alloy, the invention changes the crystallization process of a surfacing layer by applied magnetic field, and controls the distribution pattern of hard phase in the surfacing layer, thus improving the wear resistance of the surfacing layer. The invention comprises power supply equipment, which is characterized in that the power supply equipment is connected with coils arranged in a braced frame by wires. A plasma welding torch can weld under the action of magnetic lines of force of the coils.

The invention relates to an ultrafine grained Ta material and a preparation method thereof. Grain size of the ultrafine grained Ta material is smaller than or equal to 3 mu m; ultimate strength of thematerial is higher than or equal to 410 MPa, and yield strength is higher than or equal to 300 MPa. The preparation method of the material comprises the following steps: electron beam melting is performed on a Ta source, after ingot casting, an ingot is sheathed in a protective atmosphere; 3D hot-forging cogging is performed, total deformation of cogging is 65%-75%, and cogging temperature is 1150-1250 DEG C; after cogging, a sheath is removed, and low-temperature and high-temperature cross alternate rolling is performed; the ultrafine grained Ta material is obtained. The process is simple, and the prepared Ta ribbon has uniform and quite fine grains and is endowed with favorable strength, plasticity and toughness. The designed and prepared ultrafine grained Ta ribbon is applied to the high-technology fields of electronics, metallurgy, steel, chemical industry, hard alloys, atomic energy, superconducting technology, automotive electronics, aerospace, medical health and scientific research.

The invention relates to a zinc alloy material for a degradable cardiovascular stent and a preparation method of the zinc alloy material, and belongs to the technical field of materials. The zinc alloy material comprises, by weight, 0.03-0.07% of Mg, 0.03-0.07% of Mn, less than or equal to 10ppm of inevitable impurities and the balance Zn. The preparation method comprises the following steps that (1) pure zinc is heated to 600 +/-5 DEG C, melted, magnesium metal, manganese metal and phosphorus are sequentially added, and uniformly stirred, the temperature is reduced to 550 +/-5 DEG C, hexachloroethane is pressed to preserve heat and stand for 10-20 minutes, and metal melt is cooled to 500 +/-10 DEG C, and cast; (2) secondary magnetic suspension smelting is carried out, so that the component uniformity deviation is smaller than +/-0.02 wt.%; (3) heat is preserved at 350 DEG C for 5 hours, temperature is raised to 370 DEG C, heat is preserved for 5 hours, and cooling is performed to the room temperature in water; (4) heat preservation is conducted for 60-80 min at the temperature of 300-400 DEG C, and then hot forging deformation is conducted at the temperature of 300-400 DEG C; and (5) heat preservation is conducted for 30 min at the temperature of 150 DEG C, and then reverse hot extrusion deformation is conducted at the temperature of 150 DEG C. According to the zinc alloy material for the degradable cardiovascular stent and the preparation method of the zinc alloy material, a Zn-Mg-Mn alloy is excellent in mechanical property and uniform in tissue component, and can be used for preparing the biodegradable cardiovascular stent.

The invention discloses a medical Zn-Cu-Mn-Zr alloy capable of being degraded in a living body and high in strength and toughness. Zn, Cu, Mn and Zr elements are included, the content of Cu is largerthan 0 and smaller than or equal to 4%, the content of Mn is larger than 0 and smaller than or equal to 2%, the content of Zr is larger than 0 and smaller than or equal to 2%, and the balance is Zn. The corrosion rate of the alloy material in simulated body fluid is 35-71 microns/year, and a uniform corrosion degradation mode is shown; and under the conditions of the room temperature and the tensile strain rate of 1 * 10<-3>, the tensile properties are as follows: the yield strength is 200-420 MPa, the tensile strength is 210-440 MPa, and the elongation is 20-65%. The antibacterial rate on staphylococcus aureus and escherichia coli is 90% or higher. After the temperature at 380 DEG C is kept for 0.5 hour, the strain hardening index n is greater than or equal to 0.2 at the stage of true strain of 5%-15%; and moreover, no obvious cytotoxicity exists, and the biocompatibility is relatively good.

The invention provides an indium tungsten oxide target material and a preparation method thereof, and belongs to the technical field of photoelectric materials. The preparation method comprises the following steps: mixing indium oxide and tungsten oxide according to a stoichiometric ratio, and calcining to enable the indium oxide and the tungsten oxide to be subjected to complete solid-phase reaction to obtain In6WO12; the generation of oxygen vacancies can be inhibited by calcining in an oxygen atmosphere, so that the density of the product is improved; in6WO12 is mixed with indium oxide, water, a dispersing agent and a binding agent, then pressure grouting is conducted, the dispersion degree of the In6WO12 phase in the target material is improved, and meanwhile the compactness of the target material is further improved; and a dispersing agent and a binding agent are removed through degreasing treatment, and step variable-temperature sintering is combined, so that the obtained target material is uniform in structure refinement and high in density. Experimental results of the embodiment show that the relative density of the indium tungsten oxide target material prepared by the preparation method provided by the invention is 98.1-99.6%.

The present invention discloses a medical high-elasticity tin-plated alloy wire and a preparation method thereof, and belongs to the field of tin-plated alloy wires. The preparation method specifically includes the steps: firstly, melting a copper base material and alloy particles, adding strengthened particles, performing electromagnetic stirring at the pressure of 1-3 Mpa, then, performing casting to form a copper alloy rod, and then, performing wire drawing, annealing treatment, acid pickling, drying and tin plating to prepare the tin-plated alloy wire. According to the present invention, electromagnetic stirring is adopted during melting, so that crystals in a copper alloy can be obviously refined; meanwhile, crystal grains are converted into rosa-shaped structures along with pressurization, so that nearly-spherical structures are increased; and finally, all the crystal grains are converted into granular crystals, the structures are more uniform and refined in the subsequent wire drawing process, so that the strength of the copper alloy rod is improved.