34results about How to "Improve deformation energy storage" patented technology

The invention belongs to the technical field of material heat treatment, and discloses a heat treatment technology of high-strength and high-plasticity ferrite-austenite duplex stainless steel. The heat treatment technology comprises the following steps of (1) first-stage solution treatment, (2) predeformation treatment and (3) second-stage solution treatment. After the technology is adopted for treating the ferrite-austenite duplex stainless steel, a traditional dual phase structure of the duplex stainless steel can be eliminated, wherein two phases of the dual phase structure are alternatelydistributed in a layer shape; and a dual phase structure of an equiaxial austenite particle phase and a ferrite matrix phase can be obtained, and the product of strength and elongation of a materialcan be improved by 50% or above.

The invention relates to a preparation method and application of 700 MPa grade ultra-fine grain high-strength weathering steel. The preparation method includes the steps that a continuous casting blank directly enters an M rack rough rolling unit at a high pulling speed and is subject to M-gate continuous high reduction (50%-60%) rough rolling, austenite grains are greatly refined, after rough rolling is carried out, an intermediate billet is quickly heated by an induction heating furnace to the temperature needed by a finish rolling inlet, and meanwhile a reverse temperature field is formed; and then the blank sequentially passes through a finish rolling unit, a laminar cooling part and a reeling machine, and the microstructure characteristics that the surfaces and core parts are thick and 1 / 4 thickness parts are thin are finally formed. In the production process, finish rolling and rough rolling are both full-endless rolling. By means of the preparation method, an ultra-fine grain high-strength weathering steel strip with the weather fastness equal to that of corten-A can be obtained, the effects of replacing thick parts with thin parts and replacing cold with heat are achieved, and the automotive body weight is small; and meanwhile, the service life of an automotive sheet is prolonged, the production efficiency is improved, the production cost is reduced, energy consumption is reduced, emission is reduced, and resource-saving and environment-friendly production is achieved. The preparation method and application belong to the technical field of metallurgy.

The invention relates to an on-line solid-state phase change treatment device for alloy rod billets and a treatment method thereof. The device comprises a continuous extruder, a coil induction fast heating device, a first cooling device, a heating insulating device and a second cooling device which are arranged sequentially from front to back, wherein the coil induction fast heating device comprises a heating induction coil and an insulating induction coil, and the heating induction coil is positioned in front of the insulating induction coil. The on-line solid-state phase change treatment device for alloy rod billets and the treatment method thereof disclosed by the invention organically combine continuous extrusion, on-line solid solution and on-line aging, realize integration and serialization of on-line solid-state phase change heat treatment of alloy rod billets, and have the advantages of high production efficiency and stable product performance.

The invention discloses a 450MPa grade hot-dip galvanized dual-phase steel and a production method thereof, belonging to the technical field of cold-rolled strip production. The chemical composition of the dual-phase steel by mass percentage is: C 0.03%-0.10%, Si 0.20-0.60%, Mn 1.20%-2.00%, P≤0.020%, S≤0.010%, Als 0.015%-0.070%, N ≤0.0060%, the remaining elements are Fe and inevitable impurities; its microstructure is: 90-96% ferrite and 4-10% martensite by volume percentage. The preparation method includes the steps of smelting, hot rolling, pickling and hot-dip galvanizing. The production method of the dual-phase steel of the present invention adopts the sparse cooling method, which is beneficial to the stable control of the microstructure and properties; the opening and closing methods of the descaling and the cooling water between the racks are defined, which is beneficial to obtain a good surface quality. Combined with the smelting and hot-dip galvanizing process, the good mechanical properties and surface quality of the 450MPa hot-dip galvanized dual-phase steel sheet have been obtained, which has good market competitiveness.

The invention discloses a magnesium alloy reinforced by nano-quasi-crystal particles and a preparation method of the alloy, and belongs to the technical field of alloy. The alloy comprises the following components in percentage by mass: Er not higher than 10%, Zn not higher than 10%, impurity element with total amount less than 0.05%, and balance of magnesium, wherein the mass ratio of Zn to Er is 4-8. The preparation method comprises the following steps: firstly performing solution treatment to the selected alloy, cleaning the alloy, removing impurities and crushing the alloy; utilizing a multi-cyclic plastic deformation device to process the alloy, at last obtaining an extrusion blank, and extruding the blank with an extruder at 220-350 DEG C to obtain a bar; or utilizing a rolling mill to roll the alloy at a temperature not higher than 300 DEG C, and annealing the rolled alloy. According to the invention, the size of phase I in the alloy is effectively reduced; the distribution characteristics of phase I are reasonably changed; and the size of phase I in the alloy is about 10-100nm.

The invention relates to non-oriented electrical steel for a variable frequency motor and a production method thereof, aiming to overcome the defects of traditional non-oriented electrical steel which has high strength and poor toughness and can not meet the requirement of the variable frequency motor and complex process. The non-oriented electrical steel comprises the flowing chemical componentsin percentage by weight: 0.001-0.015 percent of C, 0.3-0.9 percent of Mn, 0.4-1.6 percent of Cr, 0.1-1.2 percent of Al, 0.9-1.6 percent of Si, no more than 0.08 percent of P, no more than 0.015 percent of S, no more than 0.008 percent of N and the balance of Fe and residue, wherein the sum of the weight percent of Si and Al is 1.4-2.2 percent, the sum of the weight percent of Cr and Mn is 0.7-2.5percent, and Cr / Mn is 0.9-2.0. The production method comprises the following steps of: smelting by using a clean steel process and continuously casting to form a billet; heating the billet; roughly rolling; finish rolling, and controlling the accumulated percentage of reduction of former four passes to be 80-95 percent; reeling; naturally cooling to the room temperature; washing with acid; cold rolling; decarbonizing; soaking; cooling according to conventional method, coating and finishing. The invention has the advantages of simple process, low iron loss at low frequency and power frequency,lower iron loss at high frequency, higher magnetic induction as well as good corrosion resistance and stamping property.

The invention discloses a cold-rolled steel sheet with the 420 MPa grade yield strength and a preparation method of the steel sheet and belongs to the technical field of metallurgy. The steel sheet is prepared from components in percentage by mass as follows: 0.06%-0.09% of C, 0-0.2% of Si, 0.8%-1.0% of Mn, 0-0.02% of Ti, 0.01%-0.025% of Nb and the balance of Fe and inevitable impurity elements. The preparation method comprises steps as follows: (1) according to the ratio of the chemical components of the cold-rolled steel sheet, a steel ingot is obtained through smelting and is forged to form a slab; (2) heat preservation is performed on the slab, hot rolling is performed, and a hot-rolled sheet is prepared and is cooled to the proper temperature at a certain cooling rate for coiling; (3) the coiled hot-rolled sheet is pickled and then cold-rolled, and the cold-rolled sheet is prepared; (4) the cold-rolled sheet is subjected to continuous annealing treatment of low-temperature soaking and step cooling. According to the cold-rolled steel sheet, the microstructure mainly comprises ferrite, pearlite and cementite, the yield strength of the steel sheet ranges from 435 MPa to 450 MPa, the tensile strength ranges from 518 MPa to 548 MPa, and the ductility A80 ranges from 25.0% to 26.3%.

The invention relates to a treatment method for obviously improving the deformability and the mechanical property of a high-strength aluminum alloy. The method comprises the following steps of: sequentially performing a solid solution treatment and a quenching or annealing treatment on a sheet material; performing low-temperature pre-cooling and rolling deformation on the sheet material; and recrystallizing and aging the sheet material, wherein in the low-temperature pre-cooling process, the low-temperature or ultralow-temperature cooling treatment is performed on the sheet material in a cooling medium with the temperature of 196 to -50 DEG C so that the temperature of the sheet material is equivalent to that of the cooling medium; and in the rolling process, the pre-cooling treatment can be firstly performed on a milling roller, wherein the reduction in pass can reach 5% to 30% and the total deformation can reach more than 90%. Compared with the conventional treatment process, the treatment method provided by the invention has the advantages that the temperature and the time of the recrystallization treatment and the aging treatment of the machined alloy sheet material are decreased and shortened obviously; and the rolling deformability and the strength of the high-strength aluminum alloy and other types of aluminum alloys are improved obviously. In addition, a two-high mill or a four-high mill for the existing industrial production can be applied to the alloy-machining treatment method provided by the invention, so that the alloy property is improved while the cost is lowered obviously. Therefore, the method provided by the invention has a great potential in industrial application.

The invention provides a preparation method of ultrathin Ta-W alloy foil, and belongs to the technical field of Ta-W alloy machining. The preparation method includes the steps that cyclic operation of alloy billet prepared through a powder metallurgy method, cold rolling cogging, and cold rolling and vacuum annealing, 3-5 micrometer foil annealing, and the like. The thickness of the prepared foil can reach 3-5 micrometers. The preparation method is simple in process, the prepared foil is high in precision, and compared with pure Ta foil and other Ta-W alloy foil, the ultrathin Ta-W alloy foil has the advantages of being high in strength, good in surface quality, and the like. The prepared Ta-(5.0-7.5 wt%)W alloy foil with the thickness of 3-5 micrometers is suitable for high-power microwave tubes, traveling wave tubes, and other vacuum devices of electronic components, aerospace, and other industries. The preparation method has great significance on achieving high-power high-performance microwave tube localization, improving microwave tube using performance, prolonging service life, and the like.