Medium manganese steel with high product of strength and elongation and with gradient structure and preparation method of medium manganese steel
A gradient structure, high-strength plastic product technology, applied in the direction of metal processing equipment, etc., can solve the problems of insufficient strong plastic product, low plasticity of steel, difficulty in adapting to the service environment, etc., to achieve increased strength and plastic product, improved yield strength, and simple preparation method easy effect
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Embodiment 1
[0036] This embodiment provides a gradient structure high-strength plastic product medium manganese steel, the chemical composition by weight percentage is: C: 0.2%, Mn: 8%, Al: 2%, Ni: 2%, Ce: 0.05%, P<0.008 %, S<0.008%, and the balance is Fe. The preparation method of the gradient structure high-strength plastic product medium manganese steel is as follows:
[0037] (1) Smelting, forging and hot rolling: According to the alloy composition, the steel ingot is vacuum smelted, and the steel ingot is kept at 1200°C for 2 hours, then forged into a slab with a thickness of 40mm, and air-cooled to room temperature. Then heat the slab to 1200°C, keep it warm for 2 hours, and roll it into a 15mm thick slab three times, with the final rolling temperature not lower than 900°C;
[0038] (2) Two-phase zone annealing: the hot-rolled slab is annealed at 680°C for 1 hour and then air-cooled to room temperature;
[0039] (3) Room temperature torsion + two-phase zone annealing: hot-rolled s...
Embodiment 2
[0046] This embodiment provides a kind of gradient structure high-strength plastic product medium manganese steel, its alloy composition is: C: 0.2%, Mn: 6%, Al: 1.5%, Ni: 1.5%, Ce: 0.05%, P< 0.008%, S<0.008%, and the balance is Fe. The preparation method of the gradient structure high-strength plastic product medium manganese steel is as follows:
[0047] (1) Smelting, forging and hot rolling: According to the alloy composition, the steel ingot is vacuum smelted, and the steel ingot is kept at 1200°C for 2 hours, then forged into a slab with a thickness of 50mm, and air-cooled to room temperature. Then heat the slab to 1200°C, keep it warm for 2 hours, and roll it into a slab with a thickness of 15mm after four times of rolling, and the final rolling temperature is not lower than 900°C;
[0048] (2) Two-phase zone annealing: the hot-rolled slab is annealed at 700°C for 1 hour and then air-cooled to room temperature;
[0049] (3) Room temperature torsion + two-phase zone ann...
Embodiment 3
[0053] This embodiment provides a kind of gradient structure high-strength plastic product medium manganese steel, its alloy composition is the same as that of embodiment 1, and in the preparation method, steps (1)-(2) are also the same as embodiment 1, the difference is only in step (3) ) is: twisting at room temperature + annealing in the two-phase region: hot-rolled annealed steel plate is processed into a bar-shaped sample, twisted 180° at a rate of 90° / min, and then kept at 700°C for 5 minutes and then air-cooled to room temperature.
[0054] The engineering stress-strain curve of manganese steel in the gradient structure of the present embodiment is as follows Figure 5 As shown, the tensile strength is 1101MPa, the yield strength is 782MPa, the elongation is 38.8%, and the strong-plastic product is as high as 43GPa·%.
[0055] It can be seen from the comparison that the yield strength of the medium-manganese steel with gradient structure in Example 3 is increased by 43....
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