49results about How to "High work hardening rate" patented technology

The invention relates to a multi-pass drawing process method for manufacturing magnesium and magnesium alloy filaments. The prior production method has many middle annealing times, low production efficiency, low yield of a finished product, and high cost. The multi-pass drawing process method for manufacturing the magnesium and the magnesium alloy filaments comprises: a raw material of a fine crystal magnesium or magnesium alloy wire material with diameter of between phi 2 and 3 is selected; the raw material and a wire drawing mould are lubricated through a grease-type lube and are subjected to cold drawing for 5 to 12 times, and the cold drawing speed is between 120 and 150 mm / s; the raw material is recrystallized and annealed, the annealing temperature is between 400 and 420 DEG C, and the annealing time is between 1 and 3 minutes; and the process is repeated till the process is finished. The method is used for manufacturing the magnesium and the magnesium alloy filaments.

The invention discloses hot-rolled dual-phase steel in the 590MPa tensile strength grade and a method for manufacturing the hot-rolled dual-phase steel. The steel comprises, by weight, from 0.04% to 0.10% of C, from 1.10% to 1.50% of Mn, from 0.10% to 0.20% of Si, from 0.015% to 0.070% of Als, from 0.03% to 0.08% of P, lower than or equal to 0.008% of S, from 0.5% to 1.2% of Cr, the balance Fe and inevitable impurities. The method for manufacturing the steel includes molten iron desulfurization, converter smelting, vacuum treatment, continuous casting, sizing, plate blank heating, hot continuous rolling, laminar cooling and reeling. As proved by practice, the steel is high in tensile strength, low in yield ratio and excellent in cold stamping forming performance and fatigue resistance, a technological process of the method is simple, and the production cost is low.

The invention discloses high-toughness hot-rolled medium manganese steel with strength-ductility balance greater than 60 GPa.% and a preparation method, and belongs to the field of high-toughness automobile steel. The steel comprises the following chemical components of, in percentage by weight, 0.35-0.40% of C, 6.00 -6.30% of Mn, 2.20-2.35% of Al, 0-0.027% of Nb, 0.030 -0.074% of Si, 0.05% of P,0.02% of S, and the balance Fe and inevitable impurities. The preparation method comprises the steps of raw material preparation, smelting, casting, forging, hot rolling and two-phase region annealing. According to the high-toughness hot-rolled medium manganese steel, strength of extension is 1039-1183 MPa, after-fracture elongation rate is 43.5-64.8%, strength-ductility balance can reach more than 60 GPa.%, but not greater than 72GPa.%. Through reasonable component proportion and optimized two-phase region annealing process, morphology and proportion of a two-phase structure are controlled, TRIP and TWIP effects are effectively simulated to reach a high work hardening rate, the strength and the toughness of the medium manganese steel are greatly improved, and performance indexes of different components of an automobile are met.

The invention relates to low temperature resistant microalloyed steel. The chemical components of the microalloyed steel comprise, by weight, 0.075%-0.1% of C, 0.10%-0.30% of Si, 1.0%-1.40% of Mn, 0.25%-0.50% of Cr, 0.020%-0.030% of Nb, 0.015%-0.025% of Ti, less than or equal to 0.015% of Al, less than or equal to 0.010% of P, less than or equal to 0.010% of S, the balance Fe and unavoidable impurity elements. The unavoidable impurity elements comprise the gas content and other unavoidable impurity elements, wherein the gas content comprises less than or equal to 2.0 ppm of molten steel [H], less than or equal to 2 ppm of a casting blank [H], less than or equal to 30 ppm of [O] and less than or equal to 50 ppm of [N]; and the other unavoidable impurity elements account for less than or equal to 1%. Meanwhile, the invention further relates to a production technology of the low temperature resistant microalloyed steel. Through a Nb+Ti microalloyed technology, growth of austenite grains is effectively controlled in the heating process of steel rolling, a ferrite-pearlite ultra-fine grain structure is obtained finally, the grain size reaches above the 10th level, and the technical requirements for indexed such as low temperature are met. The yield strength of the microalloyed steel is higher than 355MPa, the tensile strength is higher than 550MPa, -60 DEG C low temperature impact Ak is higher than 27J, and the elongation after breaking is higher than 22%.

The invention provides a method for refining β grains of TC18 titanium alloy by adopting step strain rate forging process. The method comprises the following steps: (1) heating the TC18 titanium alloy forging billet whose initial structure is a two-state structure to the forging temperature in the α+β dual-phase region, and keeping it warm until the temperature of the forging billet is uniform, and then performing two-stage step strain rate forging, The forging temperature is 700-820°C, the strain rate includes two stages, and the strain rate in the first stage is 0.1-0.5s ‑1 , the strain rate in the second stage is 1~5s ‑1 , the amount of deformation in the first stage is 20-40% of the height of the blank, the amount of deformation in the second stage is 30-50% of the height of the blank, the total deformation of the two stages is 50%-70%, and the strain after the deformation in the first stage is The rate changes immediately, without interval holding time; (2) After forging, immediately quench the forging. The invention can achieve the purpose of refining the beta grains of the TC18 titanium alloy with a relatively small amount of deformation.

The invention discloses a super-hard austenitic stainless steel and a preparation method thereof. The super-hard austenitic stainless steel comprises the following chemical components by weight percent: 0.08-0.13% of C, 0.3-1.0% of Si, less than 2.0% and greater than or equal to 0.5% of Mn, 16.5-17.5% of Cr, 6.5-7.5% of Ni, 0.03-0.08% of N, 0.5-0.8% of Mo, greater than or equal to 0.040% of P, greater than or equal to 0.01% of S, Fe and unavoidable impurities; the temperature of Md30 is 30-60 DEG C. By controlling the tempering and cold rolling reduction rate to 35-45%, controlling the rolling speed to less than or equal to 5m / s and the rolling temperature to less than or equal to 30 DEG C, the transformation from the austenite to the deformation martensite is created and the hardness of the material is greatly increased under the same deformation; when the tempering and cold-rolling reduction rate is 35%, the hardness HV is greater than 550 and the anisotropy of the super-hard state steel is reduced.

The invention discloses a high-strength, tough and degradable zinc alloy with high work hardening rate, including a Zn matrix, Zn+Mg refined and dispersed in the Zn matrix 2 Zn 11 Eutectic structure, micron-sized YZn is also dispersed in the Zn matrix 12 , Zn+Mg 2 Zn 11 Submicron YZn is dispersed in the eutectic structure 12 and nanoscale YZn 12 , submicron YZn 12 and nanoscale YZn 12 The area ratio is not greater than 85:15. The invention also discloses a preparation method of a high-strength and tough degradable zinc alloy with high work hardening rate and its application in biomedical degradable metal materials. The zinc alloy of the invention has both high strength and high toughness, its tensile strength is 340-530MPa, and its elongation is 10-32%, which can meet the requirements of different medical devices on the mechanical properties of the zinc alloy.