Patents
Literature

141results about How to "Grain refinement" patented technology

1200-MPa-level cold milling steel and manufacturing method thereof

InactiveCN104988391AGrain refinementIncrease the grain boundary areaDriving safetyCrystallite
The invention discloses 1200-MPa-level cold milling steel and a manufacturing method thereof. The steel comprises, by mass, 0.15-4.0% of C, 0.3-2.0% of Si, 1.0-5.0% of Mn, S with the amount equal to or smaller than 0.01 ppm, P with the amount equal to or smaller than 0.01 ppm, H with the amount equal to or smaller than 20 ppm, 0.02-2.0% of Al, 0.01-0.04% of Nb, and the balance Fe and unavoidable impurities. As the Nb element is added to the steel, crystal grain can be effectively refined, the area of crystal boundaries is increased to adsorb hydrogen atoms, and then hydrogen spreading is effectively restrained; in addition, a precipitate Nb (C, N) formed by Nb is a hydrogen trap and can effectively adsorb hydrogen in the steel so that hydrogen can be distributed uniformly in the steel and restrained from spreading or gathering, and the hydrogen induced cracking resistant characteristic of the steel is improved; in addition, the Nb element is a stable retained austenite element and can increase the strength and ductility product of the steel; due to microalloying of Nb, the hydrogen induced cracking resistant characteristic of the steel can be effectively improved; meanwhile, the crystal grain can be refined, and the stability of austenite is improved. The steel has the advantages of being high in hydrogen induced cracking resistance, large in strength and ductility product, and capable of effectively improving the driving safety of an automobile.
Owner:HEBEI IRON AND STEEL

Preparation method of Al-Cu-Mg-Ag ultrafine crystal heat-resistant aluminum alloy

The invention provides a preparation method of an Al-Cu-Mg-Ag ultrafine crystal heat-resistant aluminum alloy, comprising the following steps: hot extrusion, solid solution hardening, equal channel angular pressing and ageing treatment, thus finally improving the heat resistance of Al-Cu-Mg-Ag alloy. The specific steps are as follows: homogenizing annealing of the as-cast aluminum alloy, hot extrusion with the extrusion ratio of 8-15, multi-pass equal channel angular heat extruding deformation at the temperature of 350-430 DEG C, solution treatment, hardening in water at a room temperature, and then ageing treatment at the temperature of 150-210 DEG C; or solution treatment of the alloy in a hot extrusion state, hardening in water at the room temperature, multi-pass equal channel angular heat extruding deformation at the room temperature and then ageing treatment. The process method of the invention can improve the heat resistance of the Al-Cu-Mg-Ag alloy and enlarge the application range of the aluminum alloy on the basis of the existing alloy. The preparation method of the invention has simple process and convenient operation, and can effectively refine crystal particles of the Al-Cu-Mg-Ag alloy, improve the density of a precipitated and strengthened phase, enhance the overall strength and the high-temperature heat resistance of the Al-Cu-Mg-Ag alloy, and achieve industrialized production and application.
Owner:CENT SOUTH UNIV

Abrasion-resistant alloy cast iron material with high hardness for chute lining plate, and preparation method thereof

The invention discloses an abrasion-resistant alloy cast iron material with high hardness for a chute lining plate, and a preparation method thereof. The abrasion-resistant alloy cast iron material comprises the following chemical components in percentage by weight: 2.6-3.0% of C, 0.3-1.0% of Si, 0.5-1.0% of Mn, 21-23% of Cr, 0.8-1.2% of Mo, 0.8-1.2% of Cu, 0.6-0.9% of W, 0.1-0.2% of V, 0.06-0.12% of Ti, 0.001-0.003% of B, 0.04-0.08% of RE, 0.04-0.08% of Y, 0.04-0.08% of Al, less than or equal to 0.06% of S, less than or equal to 0.06% of P and the balance of Fe. According to the abrasion-resistant alloy cast iron material provided by the invention, the hardness of the abrasion-resistant alloy cast iron material is improved by controlling the content of chromium element and the proportion of Cr/C. Noble metal elements such as Mo, W, V, Ti and Cu are added into the cast iron, and through complex use of the noble metal elements, the stability of austenite is enhanced, grains are refined, and the high temperature stability and red hardness of carbides are improved, so that the hardness of the cast iron material provided by the invention is further improved, and the abrasive resistance is correspondingly improved. The average hardness of the alloy cast iron material provided by the invention can reach over HRC63, and the impact toughness aK of the alloy cast iron material can reach 5J/cm<2>.
Owner:驻马店市三山耐磨材料有限公司

Combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling

ActiveCN106180659AEliminate central shrinkageGrain refinementHeat-exchange elementsDirectional solidificationWater cooler
The invention relates to a combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling. By the adoption of the combined type water-cooled casting mould, from-bottom-to-top forced cooling and directional solidification of a casting blank are achieved, the situation that columnar crystals grow in the direction perpendicular to the wall of the mould and the situation that because the columnar crystals which grow in a non-directional manner are overdeveloped, the columnar crystals grow in the direction perpendicular to a base plate are avoided, the problems of central shrinkage porosity and V-shaped segregation are eliminated, a large-piece-weight cast-forged blank with grain being refined, grain size being uniform in ultrasonic testing and a solidification structure being compact, uniform and free of lacks is obtained, and the ultrasonic flow detection yield is improved; the upper half portion of a casting mould body is of a hollow heat-preservation structure; a cooling water channel and a base plate water cooler on the lower half portion of the casting mould body can conduct segmented selective cooling on different areas of the casting mould; establishment of a one-dimensional temperature field and the achievement of high cooling intensity are both considered; most of sensible heat and most of latent heat of the cast blank are conducted from the base plate, and therefore directional solidification is achieved; and a hot feeding riser is adopted, a molten glass layer, a heat generating agent layer and a covering layer which are arranged in the hot feeding riser enable a shrinkage cavity area to be mainly concentrated on the hot feeding riser, the solid height in the hot feeding riser is increased, and the ratios of a top crop and a back-end crop of the cast blank are reduced.
Owner:YANTAI WANLONG VACUUM METALLURGY

Thermal treatment method for improving mechanical performances of normalized steel plate

ActiveCN101319270AShort residence time at high temperatureGrain refinementQuenchingSteel plates
The invention discloses a heat treatment method for improving mechanical property of a normalized steel plate, which belongs to the medium and thick steel plate manufacturing technical field. A rolled microalloying steel plate containing niobium is placed into a quenching furnace for conventional normalizing treatment, and is taken out of the furnace after 3 to 40 minutes of heat insulation, the quenching furnace is adopted to perform weak water-cooling treatment to the steel plate, the ratio of water supply and drain at a water outlet of a quenching machine is controlled to between 1 and 1.8, the roll speed is maintained to between 10 and 40m/min, and the measured surface temperature of the steel plate after the weak water-cooling treatment is between 600 and 800 DEG C. The method greatly improves the comprehensive performance of the steel plate compared with the conventional normalizing treatment: the yield strength is improved by between 50 and 80MPa, the tensile strength is improved by between 20 and 30MPa, the low-temperature toughness and the strain aging performance of the steel plate are both improved, the uniformity of the performance in the thickness direction of the steel plate is improved, and the plate shape and the surface quality of the steel plate are good.
Owner:SHOUGANG CORPORATION

Sintered neodymium-iron-boron magnet without heavy rare earth and preparation method of sintered neodymium-iron-boron magnet

The invention discloses a sintered neodymium-iron-boron magnet without heavy rare earth and a preparation method of the sintered neodymium-iron-boron magnet. The constituent of sintered neodymium-iron-boron magnet is Re<Alpha>Fe<100-Alpha-Beta-Gamma>B<Beta>M<Gamma>, wherein Re is a light rare earth element and comprises an element selected from one or more than one of La, Ce, Pr, Nd, Sm and Eu; M is an addition element and comprises an element selected from one or more than one of Ti, V, Cr, Ni, Zn, Ga, Ge, Al, Zr, Nb, Co, Cu, Ag, Sn, W, Mo, Pb, Bi, Mg and Pd; Fe comprises Fe and an inevitable impurity; Alpha, Beta and Gamma are respectively atomic percentage of each element; and Alpha is more than or equal to 12 and less than or equal to 17, Beta is more than 5 and less than or equal to 6.5, and Gamma is more than or equal to 0.1 and less than or equal to 5. The sintered neodymium-iron-boron magnet has the advantages that low-melted light rare earth micro-powder is used for achieving a grain refinement effect on liquid-state coated nano metal powder moved and uniformly distributed in a grain boundary during high-temperature sintering, and moreover, the light rare earth micro-powder can simultaneously play in improving magnetic performance of a product.
Owner:ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD

Manufacturing process for bolt with high strength of more than phi 30

InactiveCN102248116AGrain refinementAvoid Coarse GrainsMetal-working apparatusBoltsHeat conservationExcess heat
The invention discloses a manufacturing process for a bolt with high strength of more than phi 30. The manufacturing process comprises the following steps of: forging; performing heat treatment and after treatment, wherein the heating forging temperature is between 1,100 and 1,300 DEG C, and the heating forging time is between 2 and 5 minutes; directly feeding workpieces into a mesh belt furnace quickly after forging for high temperature tempering, wherein the mesh belt furnace comprises a preheating area, a first heating area, a second heating area and a heat preservation area; preheating the workpieces through the preheating area after the workpieces are fed into the mesh belt furnace, and heating the workpieces through the first heating area and the second heating area; preserving the heat through the heat preservation area; cooling the workpieces which are subjected to the high temperature tempering; and trimming the cooled workpieces. By the manufacturing process, the workpieces are directly fed into the mesh belt furnace for high temperature tempering after being heated and forged, the excess heat of the forged workpieces is fully used, and time and energy are saved. The workpieces have a tempered sorbite structure after the high temperature tempering, grains are refined, and the phenomena that the grains are coarse and a martensite structure and a raw material structure are blended are prevented.
Owner:浙江迪特高强度螺栓有限公司

E-level extra-thick high-intensity steel plate produced by using continuous casting billet and production method thereof

The invention discloses an E-level extra-thick high-intensity steel plate produced by using continuous casting billet and a production method thereof. The steel plate includes the following chemical components by weight percent: 0.16-0.19% of C, 0.15-0.55% of Si, 1.45-1.58% of Mn, less than or equal to 0.018% of P, less than or equal to 0.015% of S, 0.020-0.025% of Nb, 0.020-0.050% of Alt, and the balance of Fe and unavoidable impurities; carbon equivalent CEV is 0.40-0.46%. According to the production method, optimized components, an advanced smelting technology, an optimized continuous casting process (low super-heat degree for casting, low casting speed and reasonable light pressure), and an improved heating and rolling process (heating by stages) are adopted to smelt high-quality continuous casting billet; continuous casting billet is directly used as blank instead of steel ingots, and deficiencies of the prior art are overcome; compared with the steel plate produced by using steel ingots, the E-level extra-thick high-intensity steel plate produced by using continuous casting billet has the advantages that the production process is simplified, the production cost is reduced, and the production period is shortened; compared with the steel plate produced by composite billet, the E-level extra-thick high-intensity steel plate produced by using continuous casting billet has the advantages that the plate billet composition process is eliminated; the method of using continuous casting billet to produce the high-intensity steel plate enables the thickness of the steel plate to be enlarged to 240 mm and the compression ratio to decrease to 1.38 for the first time.
Owner:WUYANG IRON & STEEL

Casting technique of grain refined solid manganese steel frog of long life

The invention relates to a process for manufacturing a solid high manganese steel frog, in particular to a technique for casting the solid high manganese steel frog which has long service life and is subjected to grain refining. The technique is suitable for manufacturing various types and specifications of solid high manganese steel frogs with a weight of less than 2 tons. The technique comprises: 1) adopting a heat-insulated riser as a riser; 2) discharging molten steel at a high temperature, and performing argon gas blowing, feeding and refining in a refining ladle after discharging; 3) performing microalloying in the refining ladle, and adding molybdenum, niobium, vanadium and titanium; 4) filling argon gas into a die cavity before casting, and performing casting under the protection of the argon gas; and 5) adopting a hot shake-out process, thermally cutting the riser, and thermally sending the cut riser into a heat treatment kiln for homogenizing. The process reduces oxidation of molten metals through nitrogen protection, purifies the molten metals due to refining in the refining ladle, and solves the problems of large crystal grains, hole shrinkage, microcracks, short service life and the like of the solid high manganese steel frog due to grain microalloying and thinning and dispersed distribution of inclusion.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1

Novel welding technique for hammering and forging high-temperature welding line

InactiveCN103506776AIncreased tissue densityGrain refinementWelding/cutting auxillary devicesFurnace typesWeld microstructureCushion
The invention discloses a novel welding technique for hammering and forging a high-temperature welding line. The novel welding technique for hammering and forging the high-temperature welding line relates to a working table, a stand column, a track cross beam, a servo trolley, elastic cushion blocks, a control cabinet and a pneumatic source. The novel welding technique for hammering and forging the high-temperature welding line is characterized in that an electric welding gun, a gas gun, an heat insulation cover plate and at least one pneumatic impact hammer are installed on the servo trolley and can move in a servo mode on the track cross beam under the control of the control cabinet, and a welding part is fixed on the working table through the elastic cushion blocks. According to the novel welding technique for hammering and forging the high-temperature welding line, the surface of the welding line which is just welded is heated through the gas gun during welding, a weld microstructure in the high-temperature state is hammered and forged contentiously through the at least one pneumatic impact hammer, and finally normalizing treatment is automatically carried out on the hammered and forged weld microstructure after heat insulation is carried out on the hammered and forged weld microstructure in the servo moving process of the heat insulation cover plate. The novel welding technique for hammering and forging the high-temperature welding line has the advantages that the structural compactness of the welding area of a component can be improved, welding stress deformation is reduced, residual stress is relieved, and high-carbon steel and alloy steel can be widely applied to the welding field.
Owner:崔景超
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products