12 results about "Pre straining" patented technology

This invention discloses a high-strength, high-toughness Al-Mg-Si alloy, belonging to the field of high-strength, high-toughness aluminum alloy preparation technology. This invention optimizes the alloy composition by adding Cu, Mn, Sc, and Zr elements, and combines this with vacuum melting, homogenization treatment, asymmetric hot extrusion, solution treatment, pre-strain treatment, and three-stage aging treatment processes to synergistically achieve a significant improvement in the strength and toughness of the aluminum alloy. Compared with conventional high-strength, high-toughness aluminum alloy production, the addition of Cu, Sc, Zr, and Mn elements, and the use of asymmetric hot extrusion + solution treatment + pre-strain treatment + three-stage aging treatment processes, results in a significant increase in both strength and toughness through the synergistic effects of grain refinement strengthening, dislocation strengthening, deformation strengthening, and second-phase strengthening. This ensures that the aluminum alloy achieves improved strength and toughness simultaneously, guaranteeing the overall performance of the finished product.

The invention relates to the technical field of steel and iron material manufacturing, in particular to a high-performance corrosion-resistant maritime work steel plate and a manufacturing method thereof.The steel plate takes low-carbon microalloying as the basic characteristic, rare earth elements are compositely added, and the rare earth elements are used for purifying steel, refining grains and spheroidizing inclusions so as to relieve stress concentration and improve toughness and corrosion resistance; and meanwhile, the aging sensitivity is relatively low. The yield strength of the steel ranges from 400 MPa to 480 MPa, the tensile strength ranges from 520 MPa to 630 MPa, the ductility is larger than or equal to 28%, the impact energy at the temperature of-60 DEG C is larger than or equal to 230 J, and the corrosion rate is smaller than or equal to 0.09 mm / a; and after 12% pre-strain + 250 DEG C heat preservation for 1 h aging treatment, the impact energy at-60 DEG C is larger than or equal to 200 J, and the strain aging sensitivity coefficient C is smaller than or equal to 15%.

The invention relates to the technical field of building structure materials, in particular to a high-strength anti-deformation light steel keel and a preparation method thereof.The preparation method comprises the following steps that S1, burdening is conducted according to a preset raw material ratio, and an electric furnace is adopted for smelting to obtain a plate blank; s2, heating, heat preservation and multi-pass hot continuous rolling are conducted, then online accelerated cooling is conducted, and hot-rolled strip steel is obtained; s3, the hot-rolled strip steel cooled in the step S2 is coiled; s4, acid pickling is conducted to remove oxide scale, then cold rolling is conducted to the target thickness, and a cold-rolled steel strip is obtained; s5, continuous cold roll forming is conducted, and a keel semi-finished product is manufactured; s6, pre-strain is applied to the keel semi-finished product, and then low-temperature aging treatment is conducted; and S7, surface coating treatment is conducted, and a finished high-strength anti-deformation light steel keel product is obtained. According to the light steel keel and the manufacturing method thereof, through alloy component optimization, structure strengthening control and surface coating collaborative design, comprehensive improvement of the light steel keel in the aspects of high strength, deformation resistance and corrosion resistance is achieved.

The application relates to the technical field of alloy materials, in particular to a high-strength alloy material and a preparation process thereof. The application overcomes the problem that the mechanical properties and high-temperature resistance of alloy materials in the prior art cannot be considered simultaneously. The alloy component obtained by the application comprises Al-Li-Cu-Zr-Sc-Yb-In-Ag, and a hot-pressed alloy is obtained through high-temperature zirconium melting-low-temperature lithium pressing smelting, hierarchical homogenization, deformation heat processing, deep cooling and pre-strain dislocation network induction technology; then a bimodal structure coexisting with equiaxed fine crystals and elongated fiber crystals is constructed through gradient instantaneous annealing, and a dense carbon atom layer is deposited on the surface by combining chemical vapor deposition technology. The alloy material obtained by the application has good fatigue resistance and corrosion resistance, and is suitable for large thin-walled stressed components of aerospace vehicles and high-temperature protection fields.

This invention provides a high-temperature carburizing bearing steel and its preparation method, relating to the field of aerospace bearing steel preparation technology. The method includes the following steps: preparing a steel ingot with a composition meeting set requirements; subjecting the ingot to anisotropic pre-straining and solution treatment to eliminate high-temperature ferrite and coarse carbide enrichment zones, thus obtaining a billet; and finally subjecting the billet to hot forming double-refining treatment to obtain the carburized bearing steel. This invention, by reducing the content of ferrite-forming elements and increasing the content of austenite-forming elements, helps promote the transformation of high-temperature ferrite into austenite during solidification, reducing solute segregation bands and brittle-inducing phases in the as-cast microstructure. The anisotropic pre-straining and solution treatment causes carbides to precipitate, consuming alloying elements in the high-temperature ferrite, and introduces high-density crystal structure defects and increases recrystallization grain boundary area, promoting the dissolution and transformation of high-temperature ferrite, further improving compositional uniformity, thereby avoiding brittle fracture problems caused by element segregation.

The invention provides high-temperature carburizing bearing steel and a preparation method thereof, and relates to the technical field of aviation bearing steel preparation, and the preparation method comprises the following steps: preparing a steel ingot with components meeting set requirements, and carrying out anisotropic pre-strain and solid solution composite treatment on the steel ingot to eliminate high-temperature ferrite and coarse carbide enrichment areas and obtain a blank; and finally, the blank is subjected to hot forming double-refining treatment, and the carburized bearing steel is obtained. By reducing the content of ferrite forming elements and increasing the content of austenite forming elements, high-temperature ferrite is promoted to be converted into austenite in the solidification process, and a solute segregation band and a brittle induction phase in an as-cast structure are reduced; through anisotropic prestrain and solid solution composite treatment, carbides are separated out to consume alloy elements in high-temperature ferrite, high-density crystal structure defects are introduced, the recrystallization grain boundary area is increased, dissolution and transformation of the high-temperature ferrite are promoted, the component uniformity is further improved, and therefore the brittle fracture problem caused by element segregation is avoided.

The invention discloses a molybdenum-rhenium alloy and a preparation method thereof. Belongs to the alloy field. The preparation method of the molybdenum-rhenium alloy provided by the invention comprises the following steps: smelting molybdenum-rhenium-lanthanum oxide alloy powder by adopting a vacuum electric arc to prepare a molybdenum-rhenium alloy casting blank; machining the molybdenum-rhenium alloy casting blank to obtain a molybdenum-rhenium alloy plate; the molybdenum-rhenium alloy plate is subjected to pre-strain plastic deformation treatment at the temperature of 25-1500 DEG C, and the molybdenum-rhenium alloy is obtained; the pre-strain plastic deformation treatment comprises the following steps: unloading to a zero stress state after applying 0.25%-2.5% of pre-strain quantity each time, and circulating for 100-1000 times. According to the molybdenum-rhenium alloy for improving the alpha texture strength through the deformation cumulative effect, the strength of the molybdenum-rhenium alloy with the low rhenium content is remarkably improved, the dosage dependence of rhenium resources is greatly reduced, and the production cost is reduced.

The application discloses a preparation method of high-strength and high-toughness Al-Mg-Si alloy, and belongs to the technical field of aluminum alloy preparation.The process adopts the mode of melting + homogenization treatment + multi-pass asynchronous rolling + three-stage solid solution + pre-strain + aging treatment.The high-strength and high-toughness Al-Mg-Si alloy comprises the following components in percentage by mass: Si: 0.6% to 1.1%, Mg: 0.5% to 1.0%, Mn: 0.2% to 0.5%, Cu: 0.5% to 1.3%, Zr: 0.15% to 0.5%, Ce: 0.15% to 0.5%, and the sum of unavoidable impurity contents is less than 0.2%; and the balance is Al.The application optimizes the design of components and process, and through the mutual synergistic effect of solid solution strengthening, fine-grain strengthening, deformation strengthening and precipitation strengthening on the generated alloy phase, the Al-Mg-Si aluminum alloy with small grains and uniform structure is obtained, so that the strength and toughness of the Al-Mg-Si aluminum alloy are greatly improved.

The application relates to the technical field of steel material manufacturing, in particular to a high-performance corrosion-resistant marine steel plate and a manufacturing method thereof. The steel plate is characterized by low-carbon micro-alloying and composite addition of rare earth elements. The rare earth elements purify the steel, refine the grains and spheroidize the inclusions to reduce stress concentration, improve toughness and corrosion resistance, and simultaneously have low aging sensitivity. The yield strength of the steel is 400-480 MPa, the tensile strength is 520-630 MPa, the elongation is greater than or equal to 28%, the impact energy at-60 DEG C is greater than or equal to 230 J, and the corrosion rate is less than or equal to 0.09 mm / a. After 12% pre-strain + 250 DEG C heat preservation for 1 h aging treatment, the impact energy at-60 DEG C is greater than or equal to 200 J, and the strain aging sensitivity coefficient C is less than or equal to 15%.

The invention relates to the technical field of steel and iron material manufacturing, in particular to a high-strength corrosion-resistant maritime work steel plate with good strain aging performance and a manufacturing method of the high-strength corrosion-resistant maritime work steel plate. And meanwhile, the aging sensitivity is relatively low. According to the comprehensive mechanical properties of the steel plate, the yield strength is 490-550 MPa, the tensile strength is 560-650 MPa, the ductility is larger than or equal to 28%, the impact energy at the temperature of-60 DEG C is larger than or equal to 220 J, and the corrosion rate is smaller than or equal to 0.08 mm / a. And after 12% pre-strain + 250 DEG C heat preservation for 1 hour aging treatment, the impact energy at-60 DEG C is larger than or equal to 190 J, and the strain aging sensitivity coefficient C is smaller than or equal to 15%.

The application relates to the technical field of steel material manufacturing, in particular to a high-strength corrosion-resistant marine steel plate with good strain aging performance and a manufacturing method thereof. The steel plate is compounded with rare earth elements, the rare earth elements purify the steel, refine the grains and spheroidize the inclusions so as to reduce stress concentration, improve toughness and corrosion resistance, and meanwhile, the steel plate has low aging sensitivity. The comprehensive mechanical properties of the steel plate are as follows: yield strength 490-550 MPa, tensile strength 560-650 MPa, elongation greater than or equal to 28%, impact energy at-60 DEG C greater than or equal to 220 J, and corrosion rate less than or equal to 0.08 mm / a. After 12% pre-strain + 250 DEG C heat preservation for 1 hour, the impact energy at-60 DEG C is greater than or equal to 190 J, and the strain aging sensitivity coefficient C is less than or equal to 15%.

To provide a steel sheet which satisfies excellent toughness in a joint after high heat input welding while satisfying low temperature toughness and strength characteristics suitable for a liquefied gas storage tank, and to provide a production method therefor.SOLUTION: The steel sheet contains predetermined elements in specific amounts, with the balance being Fe and inevitable impurities, and further has a ratio of Ti content (mass%) to N content (mass%), Ti / N, of 2.00 or more and 4.00 or less, A steel sheet having a microstructure satisfying 169 ≤ 5158 * Ti + 25563 * N ≤ 360 and having a composition in which a carbon equivalent Ceq is 0.0250% or more and 0.380% or less, a hardness at a depth position of 1 mm from a surface of the steel sheet being 210 HV or more, a volume fraction of ferrite being 20% or more and a total volume fraction of ferrite and bainite being 80% or more at a depth position of 1 / 4 of a sheet thickness from the surface of the steel sheet, and having a yield strength of not less than 235 MPa and not more than 440 MPa and a ductile-brittle transition temperature vTrs after applying a pre-strain of 5% being - 60 °C. or less.SELECTED DRAWING: None