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Fe-Mn-Si-Cr-Ni based shape memory alloy: Thermal and stress-induced martensite

机译：基于Fe-Mn-Si-Cr-Ni的形状记忆合金：热和应力诱导的马氏体

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摘要

The determining role of C- and Si-content on the shape memory effect of Fe-Mn-Si-Cr-Ni alloys, where Si was partly replaced by Co. In this regard, three alloys, Fe-15Mn-5Si-8Cr-5Ni, Fe-15Mn-5Si-8Cr-5Ni-0.1C, and Fe-15Mn-3Si-8Cr-5Ni-0.1C-2Co were designed to simultaneously study the shape memory effect and mechanical properties in relation to the microstructure. The microstructure of the alloys after cold rolling and annealing was analyzed by EBSD and X-ray diffraction techniques. The results indicated that grain size and the addition of C influenced the shape memory effect of Fe-Mn-Si-Cr-Ni-based memory alloy. With the increase of grain size, the annealing twin density was decreased, reducing the constraint on phase transformation of y-austenite to ε-martensite. Furthermore, the austenite stability was decreased, such that the martensite-content was increased, and then reduced the shape memory effect of the experimental alloy. With the addition of C, the content of thermally-induced martensite was reduced, and the probability of stress-induced transformation of martensite to obtain α'-martensite was reduced, with consequent enhancement of the shape memory effect for the experimental steel. Additionally, the strength of parent phase was enhanced by the addition of C, and the plastic deformation by slip during stress-induced martensite was minimized, leading to low a'-martensite content and promotion of reversal of stress-induced martensite.
机译：C-和Si-含量对Fe-Mn-Si-Cr-Ni合金形状记忆效果的确定作用，其中Si在这方面的三种合金，Fe-15Mn-5Si-8Cr-部分取代。 5NI，Fe-15MN-5SI-8CR-5NI-0.1C和Fe-15MN-3SI-8CR-5NI-0.1C-2CO旨在同时研究形状记忆效果和相对于微观结构的机械性能。通过EBSD和X射线衍射技术分析冷轧和退火后合金的微观结构。结果表明，晶粒尺寸和C的加法影响了Fe-Mn-Si-Cr-Ni基记忆合金的形状记忆效应。随着晶粒尺寸的增加，降低了退火的双密度，降低了Y-奥氏体对ε-马氏体的相变的约束。此外，奥氏体稳定性降低，使得马氏体含量增加，然后降低了实验合金的形状记忆效应。随着C的添加，降低了热诱导的马氏体的含量，并且降低了应激诱导的马氏体转化以获得α'-马氏体的概率，从而提高了实验钢的形状记忆效应。另外，通过加入C增强亲本相的强度，并且在应力诱导的马氏体期间滑动的塑性变形被最小化，导致低于A'-马氏体含量和促进应力诱导的马氏体的逆转。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140107.1-140107.6|共6页
  • 作者

    Ming-Ming Pan; Xiao-Ming Zhang; Ding Zhou; R.D.K. Misra; Peng Chen;

  • 作者单位

    State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 PR China;

    State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 PR China;

    State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 PR China;

    Laboratory for Excellence in Advanced Steel Research Department of Metallurgical Materials and Biomedical Engineering University of Texas at El Paso El Paso TX 79668 USA;

    State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 PR China;

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  • 正文语种 eng
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  • 关键词

    Fe-Mn-Si shape Memory alloy; Annealing treatment; Grain size; ε martensite; Shape recovery rate;

    机译：Fe-Mn-Si形状记忆合金;退火治疗;晶粒尺寸;ε马氏体;形状恢复率;

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