High-strength high-plasticity shape memory steel and preparation method thereof
A high-strength, high-plasticity technology, applied in the field of iron-based shape memory alloy materials, can solve the problems of not considering the influence of shape memory effect, less attention to the mechanical properties of alloys, and a small improvement range, so as to achieve a simple and controllable preparation process , excellent shape memory effect, and the effect of reducing cost and difficulty
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Embodiment 1
[0035] The components and mass percentages of the high-strength and high-plastic shape memory steel with recovery stress>500 MPa and recovery strain>4% in this embodiment are: Mn: 18%, Si: 5%, Cr: 7%, Ni: 4%, V: 0.5%, C: 0.1%, and the balance is Fe.
[0036] Wherein, the mass ratio of Cr and Ni is 1.75, and the atomic number ratio of V and C is 1.18.
[0037] The preparation process and steps are as follows:
[0038] After batching the raw materials according to the above percentages, they are melted in a vacuum medium frequency induction melting furnace, using argon as a protective atmosphere, with a vacuum of 0.1Pa, and filling with argon to 0.7×10 5 Pa, the heating temperature is 1500°C to 1550°C, the frequency of the induced current is 2500Hz, and the voltage is 380V, and the alloy ingot is turned and smelted for 3 to 5 times. The smelted ingot was subjected to wire cutting, cut into plates with a thickness of 22 mm, and then homogenized at 1000° C. for 5 hours. After wat...
Embodiment 2
[0052] The difference between this example and Example 1 is that in this example, the composition and mass percentage of high-strength and high-plastic shape memory steel with recovery stress>500MPa and recovery strain>4% are: Mn: 18%, Si: 5% , Cr: 9%, Ni: 5%, V: 0.8%, C: 0.17%, and the balance is Fe.
[0053] Wherein, the mass ratio of Cr and Ni is 1.8, and the atomic number ratio of V and C is 1.11.
[0054] The preparation process and steps are as follows:
[0055] After batching the raw materials according to the above percentages, they are melted in a vacuum medium frequency induction melting furnace, using argon as a protective atmosphere, with a vacuum of 0.1Pa, and filling with argon to 0.7×10 5 Pa, the heating temperature is 1500°C to 1550°C, the frequency of the induced current is 2500Hz, and the voltage is 380V, and the alloy ingot is turned and smelted for 3 to 5 times. Wire-cut the ingot obtained from smelting, cut into plates with a thickness of 22mm, and then ...
Embodiment 3
[0058] The difference between this embodiment and Embodiments 1 and 2 is that in this embodiment, the composition and mass percentage of high-strength and high-plasticity shape memory steel with recovery stress > 500 MPa and recovery strain > 4% are: Mn: 18%, Si: 5 %, Cr: 11%, Ni: 6%, V: 1.5%, C: 0.3%, and the balance is Fe.
[0059] Among them, the mass ratio of Cr and Ni is 1.83, and the atomic number ratio of V and C is 1.18.
[0060] The preparation process and steps are as follows:
[0061] After batching the raw materials according to the above percentages, they are melted in a vacuum medium frequency induction melting furnace, using argon as a protective atmosphere, with a vacuum of 0.1Pa, and filling with argon to 0.7×10 5 Pa, the heating temperature is 1500°C to 1550°C, the frequency of the induced current is 2500Hz, and the voltage is 380V, and the alloy ingot is turned and smelted for 3 to 5 times. Wire-cut the ingot obtained from smelting, cut into plates with a ...
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