142results about How to "Uniform grain structure" patented technology

The invention discloses a preparation method of a magnesium alloy strip for a cell phone shell. The preparation method is characterized in that the magnesium alloy comprises the following components by weight percent: 2%-4.5% of Al, 0.5%-0.8% of Si, 0.7%-1.2% of Cu, 0.5%-1.0% of Mn, 0.1%-0.8% of Zn, 0.2%-0.3% of Ti and the balance of Mg and inevitable impurities. The preparation method comprises the following steps: smelting, performing homogenizing annealing, performing hot rolling and performing cold rolling. The tensile strength of the magnesium alloy strip is 190MPa-210MPa, the elongation at break is 8.0%-10.0%, and the earring rate is 2%-3%; and the magnesium alloy strip can meet the thin stretching and punching forming requirement of the cell phone shell.

A reverse acting rupture disc and methods of forming the same are provided. Generally, the rupture disc comprises a bulged portion and a circumscribing flange area surrounding the bulged portion. The bulged portion includes a mechanically formed line-of-opening recess comprising a singular channel. In certain embodiments, the mechanical process by which the recess is formed utilizes a high-speed mill which removes a portion of metal from the bulged portion of the disc without disrupting the substantially uniform metallic grain structure of the metal adjacent the channel.

The invention discloses a backboard fabricating method, comprising the following steps of: providing a backboard casting piece; forging the backboard casting piece at a temperature of 800-1000 DEG C so as to form a backboard blank; and processing the backboard blank so as to form a backboard. According to the backboard fabricating method disclosed by the invention, the backboard with a finer and more uniform inner organization structure can be obtained, so that the backboard is prevented from distortion and deformation. On one hand, a deviation between each part of a target and a silicon wafer substrate is reduced, and the quality of a coating film is improved; and on the other hand, the service life of a sputtering target assembly is prolonged.

The invention relates to the field of target manufacturing and particularly relates to a silver target manufacturing method. The silver target manufacturing method comprises the following steps: selecting a silver raw material with purity of over 4N, fusing the silver raw material by utilizing the atmosphere smelting or vacuum smelting method, casting the melt and then cooling to form an ingot blank; immediately carrying out thermal insulation heat treatment on the ingot blank, i.e., carrying out thermal insulation homogenization within the temperature range of 400 to 900 DEG C and then carrying out hot rolling or forging by an air hammer to form a silver blank, wherein the thermal insulation time is over 0.5h; carrying out cold rolling on the silver blank to form a cold-rolled blank; and carrying out annealing heat treatment on the cold-rolled blank for 0.5 to 3 hours at the annealing heat treatment temperature of 350 to 700 DEG C to obtain a silver target blank with fine and uniform crystal grains and finally, machining by a machine tool to obtain a large-size silver target. The process is higher in machining efficiency and can produce the lower-cost large-size silver target with high quality.

The invention discloses an auxiliary rolling method of a magnesium alloy plate, comprising the following step: side-surface predeformation in which rolling pretreatment is carried out on the side surfaces of a magnesium alloy hot-rolling plate blank by a side-surface predeformation technique along the transverse direction or the rolling direction of the plate blank. The plate blank adopts the side-surface predeformation, the texture of the base surface of the material is weakened, the single-pass rolling deformation amount is obviously improved in the processing of subsequent rolling, the rolling molding performance of the plate blank is improved, the rolling pass and the intermediate annealing times are reduced, the processing cost of the magnesium alloy thin plate is obviously reduced, and the reasonable control of the quality and the cost of the magnesium alloy thin plate is realized. Simultaneously, the magnesium alloy plate prepared by adopting the technique has uniform and fine grain structures and excellent mechanical performance. The invention also discloses a rolling method of the magnesium alloy plate, comprising the steps: side-surface predeformation and flat-rolling molding, in the side-surface predeformation, predeformation treatment is carried out on a magnesium alloy hot-rolling plate blank from two sides; and in the flat-rolling molding, flat-rolling molding is carried out on semi-finished products of the plate blank in the range from room temperature to 400 DEG C, so as to manufacture the magnesium alloy plate.

The invention relates to a Fe-based austenite alloy oil sleeve, which comprises the following components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.01 to 1.0 percent of Si, 0.01 to 3.0 percent of Mn, 25 to 40 percent of Ni, 20 to 35 percent of Cr, 1 to 5 percent of Mo, 0.1 to 1.5 percent of Cu, 0.01 to 0.5 percent of Al, less than or equal to 0.01 percent of O, and the balance of Fe and inevitable impurities. The 90 to 140 ksi steel-grade Fe-based alloy oil sleeve meeting different well depth requirements of high-acidity oil fields and gas fields is manufactured by thermal extrusion, 1,050-1,180 DEG C of solution treatment and cold rolling of the smelted and forged blanks.

The invention discloses a high-strength and high-toughness heat-treatment-free aluminum alloy material and a preparation method, and belongs to the technical field of aluminum alloy casting. The high-strength and high-toughness heat-treatment-free aluminum alloy material comprises the following components in percentage by mass: 8.0-10.5% of Si, less than or equal to 0.15% of Fe, 0.05-0.3% of Mg, 0.05-0.3% of Zn, 0.3-0.6% of Mn, less than or equal to 0.1% of Cu, 0.05-0.15% of Ti, less than or equal to 0.005% of Ca, 0.005-0.030% of Sr, 0.1-0.3% of Zr, 0.01-0.1% of Mo, 0.01-0.3% of V, less than or equal to 0.02% of Cr, less than or equal to 0.002% of Na, less than or equal to 0.002% of P, less than or equal to 0.01% of Cd, less than or equal to 0.001% of Li, less than or equal to 0.0025% of B, less than or equal to 0.05% of Ga, and the balance Al and inevitable impurities. The alloy does not need to be subjected to heat treatment, and has excellent casting performance and mold filling capacity and good tensile strength, yield strength and toughness.

The invention provides a GH4780 alloy billet and forged piece and a preparing method thereof. The method includes the following steps of breaking columnar crystals of a GH4780 alloy ingot at 900-1160DEG C, and conducting at least two heating numbers of drawing out and upsetting until the deformation reaches 10-50% to obtain the GH4780 alloy billet. The GH4780 alloy billet prepared through coggingand forging through the method is uniform in grain structure and has the average grain size of ASTM4 grade or higher after thermal treatment. By means of the preparing method of the GH4780 alloy forged piece, the GH4780 alloy forged piece can be prepared, the GH4780 alloy forged piece with the uniform structure is obtained, and the material support is provided for the development of aero-enginesand gas turbines. The GH4780 alloy forged piece is uniform in grain structure and has the average grain size of ASTM4 grade or higher after thermal treatment.

The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a rolling process for improving surface corrosion resistance of 6061 aluminum alloy. The aluminum alloy comprises, by weight, 0.50%-0.65% of Si, less than or equal to 0.2% of Fe, 0.25%-0.35% of Cu, less than or equal to 0.10% of Mn, 0.9%-1.1% of Mg, 0.13%-0.26% of Cr, less than or equal to 0.05% of Ni, less than or equal to 0.04% of Zn, less than or equal to 0.15% of Ti, less than or equal to 0.05% of single impurities while less than or equal to 0.15% of the total impurities, and the balance Al. In the hot rolling procedure, the hot rolling process combining large-deformation rolling and small-deformation temperature control rolling is adopted, a 6061-T651 alloy thick plate with the excellent corrosion resistance is prepared, the grain structure of the plate is fine and uniform, and under the condition that the mechanical property is not lost, the corrosion resistance of the plate in the acidenvironment is greatly improved.

The invention discloses an acidic corrosion-resistant X65 seamless steel pipeline and a manufacturing method thereof. The acidic corrosion-resistant X65 seamless steel pipeline comprises, by weight, 0.08-0.16% of C, 0.15-0.35% of Si, 1.0-1.6% of Mn, 0.02-0.05% of Al, 0.03-0.049% of V, 0.01-0.04% of Ti, 0.20-0.30% of Cu, 0.20-0.30% of Ni, less than or equal to 0.015% of P and less than or equal to 0.005% of S. When C content is less than or equal to 0.12%, CE<Pcm> is less than or equal to 0.25 and when C content is greater than 0.12%, CE<IIW> is less than or equal to 0.42. According to the manufacturing method of the acidic corrosion-resistant X65 seamless steel pipeline, a continuous rolling method is used, a pipe blank is heated to a temperature of 1200-1300 DEG C through an annular furnace, a tube knockout temperature is in a range of 1190-1240 DEG C and a sizing temperature is in a range of 820-850 DEG C, in quenching and tempering treatment, a quenching heating temperature is in a range of 890-910 DEG C, a quenching medium is water, thermal insulation time is greater than or equal to 30min, a tempering temperature is in a range of 580-620 DEG C, thermal insulation time is greater than or equal to 50min, and heating straightening and flaw detection examination are carried out at a temperature greater than or equal to 400 DEG C.

The invention provides a preparation method of an aluminum-scandium alloy sputtering target material, and relates to the technical field of target material preparation. The preparation method of the aluminum-scandium alloy sputtering target material comprises the following steps that an aluminum source and a scandium source are mixed, and vacuum melting is conducted on an obtained aluminum-scandium alloy ingredient to obtain a molten aluminum-scandium alloy liquid; vacuum gas atomization is conducted on the molten aluminum-scandium alloy liquid by using an inert gas flow to obtain aluminum-scandium alloy powder; outer sheathing and hot isostatic pressing molding are sequentially conducted on the aluminum-scandium alloy powder to obtain an aluminum-scandium alloy sputtering target blank; and the aluminum-scandium alloy sputtering target blank is bound and machined to obtain an aluminum-scandium alloy sputtering target material. According to the method, the vacuum gas atomization is conducted by using the inert gas flow, contact between the molten aluminum-scandium alloy liquid and oxygen is isolated, the prepared aluminum-scandium alloy powder is high in sphericity degree, low in oxygen content, and uniform in grain structure, particle size and microstructure, and the aluminum-scandium alloy sputtering target material obtained by utilizing hot isostatic pressing molding is highin density, uniform in chemical component, and free of the defects such as segregation.

The invention relates to the technical field of aluminum alloy processing, in particular to a preparation method of an aluminum alloy plate for aviation. The aluminum alloy comprises the following chemical components of, in percentage by mass, 0.05%-0.2% of zirconium, 0.05%-0.2% of scandium, 3.0%-6.0% of zinc, 3.0%-6.0% of magnesium, 3.0%-4.0% of copper, 0.2%-0.4% of silver, 0.05%-0.2% of lithium,1.0%-1.5% of manganese, 0.8%-1.5% of silicon, 0.20%-0.40% of titanium, 0.05%-0.1% of ruthenium, and the balance aluminum and inevitable impurities, and the content of the impurities is controlled tobe 0.15% or below; and an aluminum alloy melt is prepared according to pre-prepared materials, ultrasonic vibration is adopted in a refining process to refine grains, and then the aluminum alloy platefor the aviation is obtained through pouring, homogenization, extrusion, solid solution treatment, pre-stretching and three-stage aging treatment. According to the corrosion resistance aluminum alloyplate for the aviation and the preparation method of the corrosion resistance aluminum alloy plate, the Vickers hardness of the prepared aluminum alloy plate ranges from 175 Hv to 190 Hv, the yield strength ranges from 520 MPa to 562 MPa, the tensile strength ranges from 605 MPa to 656 MPa, the elongation ranges from 9.4% to 12%, the overall performance is excellent, and the aluminum alloy plateis particularly suitable for being used in the aerospace field.

The invention discloses pulse electrochemical deposition and tissue adjustment processes for a nickel plating copper belt. The process comprises the following steps of: performing pulse plating on a nickel coating; performing subsequent cold machining deformation and vacuum heat treatment processes, and the like. By the pulse electrochemical deposition process, the thickness of the nickel coating deposited on the copper belt and the uniformity of a microscopic structure can be effectively ensured; and by the subsequent cold machining deformation and vacuum heat treatment processes, the comprehensive mechanical property, particularly the bending resistance and the physical property of the nickel plating copper belt can be improved, so that high-quality nickel plating copper belts required in industries such as electronics, batteries, electrovacuum, electric light sources and the like can be possibly processed. The pulse nickel plating and tissue adjustment process is low in required equipment investment, has a simple method, is convenient to operate and is suitable for industrial production.

The invention discloses a method for forging and cogging a magnesium alloy sheet, comprising the following steps: forging the side with a low temperature and a small stress in a cross way, namely, carrying out multi-process forging to the sheet from the side in a cross way along horizontal direction and vertical direction of the sheet, and forging with a relatively low process stress. By adopting the forging and cogging, the material undergoes large cold deformation at a low temperature, and twin refined crystal grains are effectively excited, so as to form a structure type that is helpful for consequent rolling shaping by refining the crystal grain size of the cast sheet and by effectively utilizing the twin divided crystal grains. Therefore, the single-process maximum pressing amount and continuous deforming property are greatly improved in the consequent rolling process, the rolling times and the intermediate annealing times are decreased, so that the processing cost of the magnesium alloy sheet is reduced. At the same time, the magnesium alloy sheet prepared by the method has more even and thinner crystal grain tissue and excellent mechanical property; the break tendency of the side of the sheet is greatly improved, so that the quality of the magnesium alloy sheet is improved.

The invention discloses a preparation method of a molybdenum tube for a rotating target material. The method comprises the following steps: 1, carrying out filling and hot isostatic pressing treatmenton molybdenum powder to obtain a molybdenum tube blank; and 2, extruding and annealing the molybdenum tube blank to obtain the molybdenum tube. The method has the advantages of few process steps, short production period and the like; and the molybdenum tube prepared by the method has high density and fine and uniform crystal grain structure, specifically, the density is greater than or equal to 99% of theoretical density, the average crystal grain size is smaller than or equal to 40 [mu]m, the maximum length can exceed 4 meters, and the molybdenum tube can well meet the sputtering coating requirements in the industries of plane display, solar photovoltaic and the like.

The invention relates to a nickel base alloy welding wire. Alloy of the nickel base alloy welding wire comprises, by mass, 0.4%-0.45% of C, 1.0%-1.5% of Mn, 0.15%-1.2% of Si, 0.025% or less of P, 0.02% or less of S, 28%-30% of Cr, 49%-51% of Ni, 0.1% or less of Co, 0.1% or less of Mo, 0.1% or less of Ti, 0.1% or less of Al, 4.0%- 5% of W and the balance being Fe. A method for preparing the nickel base alloy welding wire includes the steps of alloy smelting, electroslag remelting, hot forging and blooming, hot rolling and annealing, acid pickling and coping, cold drawing and hydrogen withdrawing. A CaF2 slag system, an Al2O3 slag system and a CaO slag system are adopted in electroslag remelting. Through the method for preparing the nickel base alloy welding wire, the thin welding wire with the performance meeting requirements can be prepared, and the yield is high.

The invention discloses a preparation method of a titanium-aluminum alloy target material. The preparation method comprises a powder mixing step, a filling step, a cold isostatic pressing step, a welding sheath degassing step, a hot isostatic pressing step, a slitting step, an alloying diffusion heat treatment step and a machining finishing step. The preparation method is simple in control, low inprocessing cost and high in processing efficiency.

The invention discloses a preparation method of graphite-like carbon nitride/graphene/graphene oxide composite aerogel. The preparation method specifically comprises the following steps: step 1, grinding urea or melamine or a mixture formed by mixing urea and melamine in any ratio into powder, and heating to prepare graphite-like carbon nitride; step 2, mixing the graphite-like phase carbon nitride obtained in the step 1 with distilled water; step 3, uniformly mixing the graphite-like phase carbon nitride nanosheet aqueous dispersion liquid with a graphene oxide aqueous solution and a vitamin C aqueous solution; step 4, performing high-speed centrifugation on the precursor sol; and step 5, drying the wet gel by using a freeze dryer to obtain the graphite-like carbon nitride/graphene/graphene oxide composite aerogel. The invention also provides the graphite-like carbon nitride/graphene/graphene oxide composite aerogel prepared by the method. Compared with graphite-like carbon nitride, the graphite-like carbon nitride/graphene/graphene oxide composite aerogel has the advantage that the degradation efficiency and degradation rate of organic dye degraded by a photocatalytic material are improved.

The invention discloses a seamless steel tube heat treatment process. The process comprises the following steps that (1) annealing is conducted, specifically, a semi-finished seamless steel tube is conveyed into a muffle furnace for annealing treatment; (2) quenching is conducted, specifically, the annealed seamless steel tube is conveyed into a quenching furnace for quenching treatment through a first heating stage, a second heating stage and a soaking stage; (3) quenching bath pouring soaking is conducted, specifically, the seamless steel tube is discharged from the quenching furnace after quenching is completed and soaked in quenching bath with the temperature being 15-25 DEG C, and the quenching time is 45-55 s; and (4) tempering is conducted, specifically, finally, the seamless steel tube is conveyed into a tempering furnace for tempering treatment, and the seamless steel tube is discharged from the tempering furnace and air-cooled to the room temperature after tempering is completed. Through the heat treatment process, the stability of the performance of the seamless steel tube can be improved, and meanwhile, the phenomenon that seamless steel tubes cannot be straightened and corrected due to bending and nonuniform mechanical performance caused by heat treatment is avoided.