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首页> 外文期刊>Journal of Materials Engineering and Performance >Mechanical Response of Stainless Steels at Low Strain Rate
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Mechanical Response of Stainless Steels at Low Strain Rate

机译：低应变率不锈钢机械响应

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摘要

The deformation behavior of the selected stainless steels (UNS S31603, UNS S32205, UNS S32550 and UNS S32760) was evaluated at strain rates ranging between 10(-2) and 10(-7) s(-1). Microstructural evaluation was conducted using optical and scanning electron microscopy, electron backscattered diffraction and x-ray diffraction. The total strain at fracture remained approximately constant as the strain rate increased from 10(-7) to 10(-3) s(-1). Further increase in strain rate above 10(-3) s(-1) resulted in relatively lower strain. The strain rate sensitivity of each steel decreased with increasing strain. Also, the strain hardening rate and exponent of the alloys increased with decreasing strain rate. Post-deformation microstructure evaluation on UNS S31603 specimens showed slip, twinning and martensitic transformation, while the duplex alloys exhibited slip, twinning with less noticeable martensitic transformation. Fractographic examination after tensile test indicates an increase in dimple diameter with strain rate and subsequent decrease in dimple density.
机译：所选不锈钢（UNS S31603、UNS S32205、UNS S32550和UNS S32760）的变形行为在10（-2）和10（-7）s（-1）之间的应变率下进行评估。利用光学和扫描电子显微镜、电子背散射衍射和x射线衍射进行微观结构评估。当应变速率从10（-7）增加到10（-3）s（-1）时，断裂处的总应变大致保持不变。应变率在10（-3）s（-1）以上的进一步增加导致相对较低的应变。每种钢的应变率敏感性都随着应变的增加而降低。合金的应变硬化速率和硬化指数随应变速率的降低而增大。UNS S31603试样的变形后微观结构评估显示滑移、孪晶和马氏体相变，而双相合金显示滑移、孪晶和不太明显的马氏体相变。拉伸试验后的断口分析表明，随着应变速率的增加，韧窝直径增加，随后韧窝密度降低。

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