Nanostructure-based high-energy-absorption and high-manganese type TWIP steel and preparation method thereof
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A nanostructure, high manganese technology is applied in the field of high energy absorption high manganese TWIP steel and its preparation, and can solve the problems of reducing plasticity and reducing the energy absorption capacity of TWIP steel.
Active Publication Date: 2018-01-12
UNIV OF SCI & TECH BEIJING
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The results of the study show that both pre-deformation and partial recrystallization can significantly increase the yield strength
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Embodiment 1
[0035] Preparation steps of Example 1: smelting components (mass fraction, %) are C: 0.703%, Mn: 19.79%, Al: 2.01%, V: 0.516%, Nb: 0.041%, and the balance of Fe.
[0036] according to figure 1 The preparation process flow of the casting billet is forged into a billet with a thickness of 40mm after being held at 1150°C for 1.5h, homogenized in a heating furnace at 1200°C for 1.8h; rolling is started at 1120°C, and rolled to 4± through 5 passes 0.05mm, final rolling temperature 850°C, pickling and two-stage cold rolling after air cooling to room temperature, final thickness 1.2±0.02mm; keep at 620°C for 3.5min in continuous annealing furnace, then cool at 20°C / s to room temperature.
[0037] The structure of the TWIP steel obtained in Example 1 is a single austenite structure, the average grain size is about 220nm, and there are about 20-40nm precipitates evenly distributed thereon, the yield strength is 816MPa, and the tensile strength is 1183MPa. The elongation rate is 38.25...
Embodiment 2
[0038] Preparation steps of Example 2: smelting components (mass fraction, %) are C: 0.697%, Mn: 19.85%, Al: 2.21%, V: 0.521%, Ti: 0.032%, and the balance of Fe.
[0039] according to figure 1 The preparation process flow of the casting billet is forged into a billet with a thickness of 40mm after being held at 1150°C for 1.5h, homogenized in a heating furnace at 1200°C for 1.8h; rolling is started at 1120°C, and rolled to 4± through 5 passes 0.05mm, final rolling temperature 850°C, pickling and two-stage cold rolling after air cooling to room temperature, final thickness 1.2±0.02mm; keep at 680°C for 3.5min in the continuous annealing furnace, then cool at a cooling rate of 20°C / s to room temperature.
[0040] The structure of the TWIP steel obtained in Example 2 is a single austenite structure, the average grain size is about 305nm, and there are about 25-40nm precipitates evenly distributed on it, the yield strength is 667MPa, and the tensile strength is 1116MPa. The elonga...
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Abstract
The invention relates to nanostructure based high-energy-absorption and high-manganese type TWIP steel and a preparation method of the nanostructure based high-energy-absorption and high-manganese type TWIP steel, and belongs to the field of metal materials. The nanostructure comprises nano-scale tissues and nano-sized precipitates, wherein the nano tissues can improve the strength of the materials and can also improve the plasticity of the materials, and the reinforcement of the materials is dominated by the nano precipitates. According to the nanostructure-based high-energy-absorption and high-manganese type TWIP steel and the preparation method of the nanostructure based high-energy-absorption and high-manganese type TWIP steel, on the basis of the addition of V element, Ni and Ti microalloy elements are further added, the TWIP steel which is of the nanostructure and the high energy absorption capability is obtained after the working procedures of smelting, casting, forging, homogenizing in a heating furnace, hot rolling, acid pickling, two-stage cold rolling and annealing. After the high-manganese TWIP steel is subjected to a one-way tensile test with the speed rate being 1 mm/min at the room temperature, the yield strength of the high-manganese TWIP steel is 650-820 MPa, the anti-extension strength of the high-manganese TWIP steel is 1080-1180 MPa, the cracked extension rate is 30% or above, the energy absorbed in the process of extension and deformation is 35 GPa% or above; and the nanostructure based high-energy-absorption and high-manganese type TWIP steel is excellent in chemical property, and the preparation method of the nanostructure based high-energy-absorption and high-manganese type TWIP steel is simple and feasible.
Description
technical field [0001] The invention belongs to the field of advanced high-strength automobile steel development, and simultaneously provides a nanostructure-based high-energy-absorbing high-manganese TWIP steel and a preparation method thereof. Background technique [0002] With the development of automobile lightweight, automobile manufacturers have put forward higher requirements for automobile steel. TWIP (twinning induced plasticity) steel has excellent properties such as high strength, high plasticity, high work hardening rate, and impact resistance. The comprehensive performance has shown attractive application potential in the fields of automobile, military industry, aviation, oil exploration and so on, which has set off a wave of research and development again and again. [0003] Automobile steel needs to ensure its strength and safety performance while realizing the weight reduction of automobiles. This inevitably requires TWIP steel to have both high energy absorp...
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