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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

Active Publication Date: 2020-06-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the improvement reported so far is not large. The main reason is that the relevant researchers only added carbide-forming elements on the basis of the original alloy composition, but did not take the initiative to redesign the alloy composition, especially did not consider the newly added alloy elements. The effect of its ratio with the original main alloying elements on the shape memory effect
On the other hand, Fe-Mn-Si-based shape memory steel is mainly used as a structural material, so its mechanical properties such as strength and plasticity are also very important. The ideal state is to have both excellent shape memory effect and high strength and high Plasticity, but the relevant researchers pay less attention to the mechanical properties of this type of alloy

Method used

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  • High-strength high-plasticity shape memory steel and preparation method thereof
  • High-strength high-plasticity shape memory steel and preparation method thereof
  • High-strength high-plasticity shape memory steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to high-strength high-plasticity shape memory steel of which the recovery stress is higher than 500 MPa and the recovery strain is higher than 4%, and a preparation method thereof. Alloy comprises the components of, by mass percent, 18-24% of Mn, 4.5-6.5% of Si, 7-11% of Cr, 4-6% of Ni, 0.08-1.5% of V, 0.02-0.3% of C and the balance Fe. The preparation method of the alloy comprises the steps of vacuum induction smelting and heat treatment, and a preparation technology is simple and controllable. According to the shape memory steel obtained by optimizing the components ofthe alloy, under the condition free of heat mechanical treatment, the recovery stress is higher than 500 MPa, the recovery strain is higher than 4%, the strength is higher than 700 MPa, the elongationpercentage is larger than 10%, and the excellent shape memory effect and mechanical property are embodied.

Description

technical field [0001] The invention belongs to the technical field of iron-based shape-memory alloy materials, and relates to a high-strength and high-plasticity shape-memory steel with recovery stress>500MPa and recovery strain>4% and a preparation method thereof. Background technique [0002] In the early 1980s, relevant research showed that the single crystal of Fe-30Mn-1Si alloy along the <414> crystal direction has excellent shape memory effect, and the recovery strain exceeds the traditional nickel-titanium-based and copper-based shape memory alloys, thus opening the A new direction for the development of Fe-Mn-Si based shape memory alloys. Compared with nickel-titanium-based and copper-based shape memory alloys, Fe-Mn-Si-based shape memory alloys have the characteristics of low cost, good weldability, good processability, and excellent mechanical properties. They have been used in large pipe joints and rail connecting plates. , Concrete structures have b...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/34C22C38/46C21D1/18C21D1/26C21D8/02
CPCC22C38/58C22C38/34C22C38/46C21D1/18C21D1/26C21D8/0226
Inventor 赖敏杰薛梦姣李金山薛祥义
Owner NORTHWESTERN POLYTECHNICAL UNIV
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