Process for producing twin crystal inducement plastic steel material with high carbon content
A technology for twin-induced plasticity and steel materials, which is applied in metal rolling, manufacturing tools, temperature control, etc., can solve the problems of limited application scope and low material properties, and achieves low cost, simple preparation method and good application prospects. Effect
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Embodiment 1
[0025] The steel plate is prepared by traditional vacuum smelting and hot rolling process
[0026] Its composition is: C%=0.63wt%, Mn%=23.6wt%, Si%=0.20wt%, P%=0.009wt%, S%=0.0065wt%, Al%=0.036wt%, the balance is Fe .
[0027] Smelting process: Vacuum smelting in an electromagnetic induction furnace, filled with argon for protection, and cast into a 90mm slab.
[0028] Rolling process: the heating temperature of the steel material is 1200°C, and the heat preservation is 3 hours for homogenization treatment. Hot rolled on a 350 two-roll hot rolling mill to obtain a hot-rolled sheet with a thickness of about 3.5mm and a total deformation of 95%. / s), can obtain tensile strength 1001MPa, yield strength 535MPa, while elongation reaches 52% hot-rolled sheet.
Embodiment 2
[0030] Steel plates are prepared by traditional vacuum smelting and hot rolling and cold rolling processes
[0031] Smelting process: Vacuum smelting in an electromagnetic induction furnace, filled with argon for protection.
[0032]Rolling process: the heating temperature of the steel material is 1200°C, and the heat preservation is 3 hours for homogenization treatment. Hot rolled on a 350 two-roll hot rolling mill to obtain a hot-rolled sheet with a thickness of about 3mm, with a total deformation of 95%. The starting and finishing temperatures are 1100°C and 950°C respectively. Rolling, cold rolling to a test sheet with a thickness of 1.0 mm, the cold rolling reduction is 66.7%.
[0033] Heat treatment process: 1.0mm thick cold-rolled steel plate is kept in a heating furnace at 700°C for 20 minutes, and then cooled to room temperature at a rate of 10°C / s.
[0034] According to optical microstructure observation, the structure at room temperature is the annealing twins of ...
Embodiment 4
[0040] The difference with Example 1 and Example 2 is: the composition of its steel material is: C%=0.44wt%, Mn%=21.44wt%, Si%=0.10wt%, P%=0.006wt%, S% =0.0055wt%, Al%=0.026wt%, and the balance is Fe. Through the processing of embodiment 1 and example 2,
[0041] Among them, the cold rolling reduction rate is 71.4%, the thickness of the cold rolled sheet is 1.06mm, the heat treatment temperature is 750°C, the temperature is kept for 15min, and the temperature is cooled to room temperature at a speed of 30°C / s.
[0042] Under the conditions of this process, high-strength, high-plastic twin-induced plasticity steel is prepared. The steel material also has a microstructure of annealing twins and stacking faults in the austenite matrix, and its grain size is 2-5 μm. . The yield strength of the steel material at room temperature is 465MPa, the tensile strength is 1040MPa, and the elongation is 61.0%.
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