36results about How to "Improve tissue performance uniformity" patented technology

The invention relates to aggregation-type composite powder for a high-temperature abradable seal coating layer and a preparing method of the aggregation-type composite powder. The aggregation-type composite powder which has good spraying technology adaptability is prepared through the method of mechanical milling, room-temperature binding and aggregation. The powder comprises MCrAlY alloy powder, alloy powder with beta-NiAl intermetallic compounds as a main phase, polybenzoate powder, boron nitride, binding agents and the like. Raw materials can be the combination of the materials, and the binding agents can be inorganic matter or organic matter. The powder comprises beta-NiAl intermetallic compound high-temperature-resisting components, heat-resisting temperature of an existing metal-based seal coating layer can be raised, and compared with a ceramic seal coating layer, the coating layer has great thermal shock resistance and can be used under the working condition of the high temperature of 1000 DEG C for a long time. The powder has wide application in gas channel sealing of a combustion gas turbine high-temperature part, especially of a high-pressure turbine.

The invention relates to the field of aluminum base composite material processing, in particular to an extrusion process for a vehicle body in-situ nanoparticles enhancing aluminum base composite material. The vehicle body in-situ nanoparticles enhancing aluminum base composite material synthesized in situ under the outer field control is used as a research object, the casting defects such as holes and loosening are eliminated by adopting the hot extrusion plasticity, so that the texture is refined and dense, the extruded grains are uniform and small, and the mechanical properties are obviously improved; meanwhile, under the action of the extrusion pressure, the agglomeration particles are dispersed and dispersed in a matrix, the bonding force with the matrix is higher, a lot of dislocation is generated, a high-density dislocation mesh is formed, and dislocation enhancement is produced accordingly. The T4P+ artificial aging heat treatment of the follow-up extrusion material can eliminate the thermal residual stress caused by the different thermal expansion coefficients of nanoparticles and matrix in the process of the hot extrusion, the plasticity of the vehicle body extrusion material is further improved, and the vehicle body in-situ nanoparticles enhancing aluminum base composite material extrusion material which can replace the steel plate is obtained.

The invention provides a preparation method of an easy-cutting aluminum alloy extrusion rod without coarse grain rings. The preparation method comprises the following steps of conducting material mixing according to the composition and mass percentages of components of an aluminum alloy; conducting electromagnetic stirring, and melting the mixture into an aluminum alloy solution; conducting in-furnace powder spraying, refining, degassing and impurity removing; conducting online grain refinement treatment; conducting online degassing and filtering treatment; conducting ultrasonic vibration andsemi-continuous casting; conducting homogenizing treatment on a cast rod; heating the cast rod, and conducting extrusion molding; drawing and straightening the cast rod; and conducting artificial aging treatment. According to the preparation method, through optimization design of the preparation process and parameters of the aluminum alloy extrusion rod and by inhibiting growth of recrystallized grains and eliminating the defects of coarse grain ring structures of the extrusion rod, the extrusion rod can have the fine and uniform grain structure, the homogeneity of the structure performance ofthe extrusion rod is improved, and the aluminum alloy extrusion rod has the excellent mechanical performance and machinability.

The invention provides a method for preparing high-quality 8CrV2 hot-rolled sheet steel based on continuous casting and continuous rolling processes of sheet billets. The method mainly comprises the technical processes of smelting, refining, continuous casting of sheet billets, soaking, hot continuous rolling, cooling and coiling. The superheat degree T(superheat) of molten steel is greater than 30 DEG C and less than or equal to 45 DEG C, the charging temperature T(charging) of casting billets is greater than or equal to 900 DEG C and less than or equal to 1050 DEG C, the finishing temperature T(finishing) is greater than or equal to 850 DEG C and less than or equal to 950 DEG C, the coiling temperature T(coiling) is greater than or equal to 550 DEG C and less than or equal to 630 DEG C, and the pulling speed S(pulling) of continuous casting is greater than or equal to 3.5m/min and less than or equal to 5.5m/min; covering slag is used for casting; and the molten steel comprises the following chemical components: 0.70-0.80 of C, 0.20-0.45 of Si, 0.60-0.90 of Mn, less than or equal to 0.025 of P, less than or equal to 0.025 of S, 0.30-0.60 of Cr and 0.02-0.08 of V. The 8CrV2 hot-rolled sheet steel prepared by the method of the invention reduces the segregation, loosen and cracks of the casting billets, and has the characteristics of uniform structure property and high fatigue resistance.

The invention discloses a high-temperature alloy bar billet heating device and method for shaft forgings, belongs to the field of material forming and control, and aims to achieve independent controlover local structures of the forgings and improve the uniformity of overall assemblies of the forgings. The heating device comprises a heating furnace, a controller, a temperature controller, a temperature measuring galvanic couple and a variable-frequency power supply, wherein an input port of the controller is connected with the temperature measuring galvanic couple; an output port of the controller is connected with an input port of the temperature controller; an output port of the temperature controller is connected with the variable-frequency power supply; and the variable-frequency powersupply supplies power to an induction coil in the heating furnace. According to the heating method, the core surface temperature difference is controlled to be smaller than or equal to 5 DEG C, the temperature of a bar billet transition area is gradually decreased to the normal temperature from the large end to the small end, and discharging is conducted when the core temperature reaches the settemperature. According to the high-temperature alloy bar billet heating device and method for shaft forgings provided by the invention, electromagnetic induction heating is adopted, local deformationof a rod blank is controlled, the proper heating temperature is matched according to forging deformation at all positions, the heating range is accurately controlled, the local structure performance of a forging is independently controlled, and the uniformity of the overall structure performance of the forging is improved.

The invention belongs to the technical field of metallurgical processes and equipment, and relates to a continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystals and a control method. The invention discloses a continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystals. The continuous casting and rolling production line comprises a continuous casting machine, a roughing rolling unit, an intermediate billet heat preservation device, a finishing rolling unit, an after-rolling cooling device, a high-speed flying shear and a coiling unit which are sequentially arranged along a rolling line. A rolled piece heating device, a descaling device, an accident handling device, an intermediate billet cooling device and the like can be arranged on the production line according to needs. The intermediate billet heat preservation device is arranged in front of a finishing mill group, the temperature of the intermediate billet when reaching an inlet of the intermediate billet heat preservation device is controlled to be below the ferrite phase change temperature, the heating temperature of the intermediate billet heat preservation device is controlled, the intermediate billet is subjected to heat preservation or slow cooling in the device, the austenite-ferrite phase change time is prolonged, and the production efficiency is improved. And phase change is fully carried out, mixed crystals caused by double-phase rolling are avoided, and the structure property uniformity of a ferrite rolled product is improved.

The invention relates to the technical field of high-temperature alloy materials, and particularly discloses a high-quality nickel-chromium-iron-based high-temperature alloy plate and a preparation method thereof. The preparation method of the high-temperature alloy plate comprises the following steps of preparation of a plate blank, cold rolling, solution treatment of a finished product and surface treatment. Wherein cold rolling is conducted, specifically, a prepared plate blank is subjected to cold rolling, and a cold-rolled plate is obtained; solution treatment is conducted on a finished product, specifically, the cold-rolled plate is subjected to solution treatment, and the plate subjected to solution treatment is obtained; surface treatment: carrying out acid and alkali washing and surface oil grinding on the plate subjected to solution treatment to obtain a surface-treated plate; the surface oil grinding mode is single-face grinding; and controlling the total thickness reduction of the plate after surface treatment to be less than or equal to 1% of the thickness of the cold-rolled plate. The high-temperature alloy plate prepared by the preparation method provided by the invention has high thickness precision and high surface quality at the same time.

The invention belongs to the technical field of heat treatment, and particularly relates to a cover annealing method for high-Cr-Si alloyed hot-formed steel. Aiming at the problems of low yield, large performance fluctuation and the like caused by poor structure property uniformity after coiling of high-hardenability high-Cr-Si alloyed hot-formed steel, limited martensitic structure bending properties after hot forming, and unstable processes of acid pickling welding, uncoiling blanking and hot forming processes, the invention provides the cover annealing method for improving uniformity and bending properties of high-Cr-Si alloyed high-hardenability hot-rolled hot-formed steel. According to the invention, after cover annealing, structure uniformity of a hot-formed steel coil is greatly improved, internal stress is reduced, a performance difference between the head and tail of the steel coil and the coil center is reduced, uncoiling buckling is improved, and the material loss of the edge and the head and tail is reduced. In addition, in a cover annealing process, a decarburized layer with certain thickness can be generated on a surface of the steel coil containing the components provided by the invention under the reduction action of high-temperature hydrogen, so that bending properties of hot-formed steel manufactured through subsequent hot forming processing are improved.

The invention discloses a 720MPa-grade large-thickness ship steel plate. The 720MPa-grade large-thickness ship steel plate is manufactured from the following chemical components in percentage by mass: 0.055% to 0.09% of C, 0.05% to 0.14% of Si, 1.65% to 1.95% of Mn, less than or equal to 0.002% of S, less than or equal to 0.008% of P, 0.02% to 0.05% of Als, 0.003% to 0.010% of N, 0.70% to 0.95% of Ni, 0.70% to 1.00% of Cr, 0.02% to 0.04% of Nb, 0.15% to 0.30% of Cu, 0.008% to 0.015% of Ti, and the balance of Fe and inevitable impurities. The technical requirements of severe and harsh ocean environments on a marine steel plate can be met.