Method for improving shape memory effect of metastable austenitic stainless steel

A metastable austenite and memory effect technology, applied in the field of austenitic stainless steel, can solve problems such as poor memory effect, achieve the effect of improving shape memory effect and expanding the scope of application

Inactive Publication Date: 2014-05-07
SICHUAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The present invention aims at the existing problem of poor shape memory effect of metastable austenitic sta

Method used

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  • Method for improving shape memory effect of metastable austenitic stainless steel
  • Method for improving shape memory effect of metastable austenitic stainless steel
  • Method for improving shape memory effect of metastable austenitic stainless steel

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Experimental program
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Effect test

Embodiment 1~18

[0015] Commercial AISI304 stainless steel plate by weight percentage content of each element is as follows: Cr 18.12%, Ni 8.16%, Mn 1.51%, Si 0.53%, Cu 0.04%, V 0.11%, C 0.04%, the remainder is Fe and unavoidable Impurities. by formula M d =580-520C-2Si-16Mn-16Cr-23Ni-300N-26Cu-10Mo Calculate the maximum temperature M of its deformation-induced α′ martensite transformation d It is equal to 55.34°C and higher than -196°C, so the tensile deformation temperature range of this alloy is -196°C~55.34°C. The specific treatment process is as follows: first, the plate is subjected to solution treatment, and then stretched and deformed at different temperatures with different deformation amounts, followed by annealing treatment, and the above process of stretching deformation and annealing is cycled 1 to 5 times. The shape memory effect of the material is tested by bending deformation method: the sample is first deformed by 2% under liquid nitrogen, and then heated at 600°C for 5 minu...

Embodiment 19~27

[0020] Forged commercial AISI304 stainless steel by weight percentage content of each element is as follows: Cr 18.63%, Ni 8.77%, Mn 1.46%, Si 0.46%, Cu 0.05%, V 0.12%, C 0.05%, the rest is Fe and unavoidable of impurities. by formula M d =580-520C-2Si-16Mn-16Cr-23Ni-300N-26Cu-10Mo Calculate the maximum temperature M of its deformation-induced α′ martensite transformation d It is equal to 28.63°C and higher than -196°C, so the rolling deformation temperature range of this alloy is -196°C~28.63°C. The specific treatment process is as follows: first, the alloy is subjected to solution treatment, then rolled and deformed at 20°C with different deformations, and then annealed, and the above-mentioned rolling deformation plus annealing process is cycled 1 to 2 times. The shape memory effect of the material is tested by bending deformation method: the sample is first deformed by 2% under liquid nitrogen, and then heated at 600°C for 5 minutes to recover. The specific processing p...

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Abstract

The invention discloses a method for improving a shape memory effect of metastable austenitic stainless steel and belongs to the field of austenitic stainless steel, aiming at an existing problem that the shape memory effect of the metastable austenitic stainless steel is poor. The method comprises the specific steps as follows: (1) carrying out solid solution treatment on the metastable austenitic stainless steel at 1,000-1,300 DEG C for 10 minutes to 2 hours; and (2) deforming the metastable austenitic stainless steel subjected to the solid solution treatment at -196 DEG C to induce alpha' martensite transformation, and performing stretching or rolling deformation for 5%-30% at a highest temperature Md; then carrying out annealing treatment at 400-800 DEG C for 5 minutes to 1 hour; and circulating the process of deforming and then carrying out the annealing treatment for 1-5 times, wherein an alpha' martensite exists in an austenitic base body of the metastable austenitic stainless steel treated by the method. The shape memory effect of the metastable austenitic stainless steel can be obviously improved.

Description

technical field [0001] The invention relates to austenitic stainless steel, in particular to a method for improving the shape memory effect of metastable austenitic stainless steel. Background technique [0002] Metastable austenitic stainless steel refers to stainless steel that has a single-phase austenite structure at room temperature after solution treatment, and produces α' martensite and ε martensite after deformation or cooling. At present, metastable austenitic stainless steel is represented by AISI304, AISI301 and AISI201. In 1971, Enami et al. found that AISI304 metastable austenitic stainless steel had obvious shape memory effect (K. Enami, S. Nenno and Y. Minato. Scripta metallurgica, 1971, 5: 663). Although the shape memory effect of metastable austenitic stainless steel without special treatment is significantly lower than that of stainless austenitic Fe-Mn-Si-Cr-Ni series shape memory alloys, the corrosion resistance of metastable austenitic stainless steel, ...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D6/04
Inventor 彭华备陈捷文玉华
Owner SICHUAN UNIV
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