7results about How to "Fully recrystallized" patented technology

The invention discloses an aging strengthening type nickel-based superalloy with a stable superhigh-temperature structure and a preparation method thereof, and belongs to the field of nonferrous metallurgy. According to the high-temperature alloy, a cast ingot is prepared according to a method combining vacuum induction melting and vacuum consumable remelting, then the cast ingot is subjected to homogenization treatment to obtain a casting blank, and then the aging strengthening type nickel-based high-temperature alloy finished product is obtained through forging cogging, forming rolling, final rolling and solid solution heat treatment, according to the invention, the original hot working process is optimized by combining high-temperature large-deformation forming rolling with relatively low-temperature and small-deformation finish rolling, so that the structure of the alloy subjected to ultrahigh-temperature solid solution heat treatment is more uniform and stable, the grain size is greater than level 5, and the high-performance requirements of novel aerospace crafts on the high-temperature alloy in an extreme environment can be met.

The invention discloses a preparation method of an aluminum foil blank for a high-strength 8021 battery soft package, and belongs to the technical field of aluminum alloy processing. According to the method, an 8021 alloy cast ingot serves as a raw material, hot rolling, segmented cold rolling, medium and low temperature intermediate annealing, finish rolling and other procedures are carried out, and the high-strength aluminum foil blank is prepared by optimizing rolling reduction distribution and roll surface roughness. The tensile strength of the obtained blank is larger than or equal to 170 MPa, the plasticity and the surface quality are excellent, the process energy consumption is lower, equipment does not need to be newly added, and the method is suitable for industrial production of the aluminum foil blank for the high-end soft package lithium battery aluminum-plastic film.

The invention relates to the technical field of additive manufacturing, in particular to a heat treatment method for improving the high-temperature toughness of an additive manufacturing nickel-based superalloy GH4099. Comprising the following steps: (1) a first-step high-temperature solution treatment system: preserving heat at 1180-1225 DEG C for 1-4 hours, and cooling to below 900 DEG C at the speed of 0.1-10 DEG C / min; (2) a second-step low-temperature solution treatment system: keeping the temperature at 980-1050 DEG C for 2-5 hours, and cooling (or air-cooling) to 900 DEG C or below at the speed of 10-50 DEG C / min; and (3) the aging treatment system is that heat preservation is conducted for 4-16 h at the temperature of 780-900 DEG C, and air cooling is conducted. According to the method, stable control of carbides, formation of zigzag grain boundaries, increase of twin crystal structures and size bimodal distribution of gamma'phases are achieved through high-temperature and low-temperature two-step solid solution and regulation and control of the cooling rate; the GH4099 nickel-based high-temperature alloy formed through additive manufacturing has the advantages that the tensile property at the high temperature of 900 DEG C is greatly improved under the condition that the tensile property at the room temperature is basically kept, the yield strength is improved by 15-50%, and the elongation is increased by 100-350%.

The invention relates to a corrosion-resistant magnetically soft alloy, in particular to a high-chromium high-plasticity corrosion-resistant magnetically soft alloy and a preparation method of a bar of the high-chromium high-plasticity corrosion-resistant magnetically soft alloy. Comprising the following steps: proportioning: weighing 2.2-2.8% by weight of silicon and 0.3-0.6% by weight of manganese as alloying raw materials; the method comprises the following steps: weighing 0.005 to 0.008 percent of carbon and 0.8 to 1.2 percent of aluminum as a deoxidizing and desulfurizing agent; 19.0-21.0% of chromium and the balance iron are weighed to serve as smelting raw materials; and vacuum melting, molten steel deoxidation, desulfurization and alloying, primary forging, secondary forging and heat treatment are conducted, and the high-chromium high-plasticity corrosion-resistant magnetically soft alloy bar is manufactured after heat treatment is completed. By increasing the content of chromium in the corrosion-resistant magnetically soft alloy and introducing the aluminum element, the corrosion resistance, plasticity, resistivity and magnetic performance of the corrosion-resistant magnetically soft alloy are improved.

The present invention discloses a large turbine disk forging and a preparation method thereof, which belongs to the technical field of difficult-to-deform high-temperature alloys, and solves one of the problems in the prior art that the large turbine disk preparation process is prone to cracking, poor structural uniformity, and poor comprehensive mechanical properties. The preparation method comprises: smelting to obtain a steel ingot; blanking the steel ingot into a bar; using a die forging press to make a cake; using a die forging press to prepare a preform; using a die forging press to forge and prepare a final forging; critical solution treatment; low-temperature aging treatment to obtain a large turbine disk forging; the temperature T1 of the cake in step 2, the temperature T2 of the preform in step 3, and the temperature T3 of the final forging in step 4 meet the following relationship: T1>T2>T3. The turbine disk forging prepared by the method of the present invention has excellent mechanical properties.

The invention discloses a TA11 titanium alloy bar with high creep resistance and high fatigue performance and a preparation method of the TA11 titanium alloy bar, and belongs to the field of titanium alloy material processing. 2, the blank is subjected to multi-heating-number circulating forging; step 3, rolling a finished bar; and 4, surface treatment. By optimizing the proportion of the alpha stable element, the beta stable element and the trace strengthening element and carrying out multi-heating-number forging and finished product rolling to refine the alloy structure within the range above and below the phase transformation point temperature, the high fatigue performance of the TA11 alloy bar is achieved, meanwhile, the trace silicon element is introduced, the dispersion strengthening effect of silicide is utilized, and the high fatigue resistance of the TA11 alloy bar is achieved. Dislocation motion and grain growth are hindered, the high creep resistance of the TA11 alloy is achieved, and the creep resistance and the fatigue resistance of the TA11 alloy bar are synergistically improved.

The invention discloses a continuous recrystallization annealing treatment process for a TC4 titanium alloy cold-rolled strip coil. The continuous recrystallization annealing treatment process comprises the following steps: S1, a pretreatment stage; the TC4 titanium alloy cold-rolled strip coil is subjected to surface cleaning treatment; s2, after the furnace temperature rises to the required temperature, the pretreated TC4 titanium alloy cold-rolled strip coil is fed into a continuous annealing furnace to pass through a heating section of the continuous furnace at a specified speed; s3, a cooling stage; the TC4 titanium alloy cold-rolled strip coil is rapidly and evenly cooled, and the tapping temperature is smaller than or equal to 70 DEG C; and S4, a post-processing stage: carrying out detection. Through the principle of segmented annealing, the segmented annealing and hot leveling processes are adopted in the annealing process, and the flatness, the mechanical property and the corrosion resistance of the product are improved.