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The effect of dynamic strain aging on fatigue property for 316L stainless steel

机译：动态应变时效对316L不锈钢疲劳性能的影响

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摘要

The effect of strain range on dynamic strain aging (DSA) is discussed based on the low cycle fatigue tests for different strain ranges conducted for 316L stainless steel at strain rate of 1 × 10~(-3) s~(-1). The variations of stress drop and hardening ratio are both compared for different strain ranges. The variations of stress drop are attributed to the dependence of vacancy concentration on strain range. The hardening ratio is higher at 600 ℃ than those at 20 ℃ and secondary hardening behavior occurs for larger strain range. The dependence of DSA on the number of cycles and the wave type for different stages are analyzed. Obvious DSA is observed in first few cycles, followed by weakening serrated yielding. However, the serrated yielding occurs again before fatigue failure. The difference of serrated yielding can be explained by the types of atom atmospheres at different cycles. A serrated wave is observed for smaller strain ranges, however, A, B, A + B, C, and B + C serrated waves can be found at different cycles for larger strain range. Finally, the crack nucleation and propagation on fracture surfaces are characterized by scanning electron microscope (SEM).
机译：基于316L不锈钢在1×10〜（-3）s〜（-1）的应变速率下对不同应变范围进行的低周疲劳试验，探讨了应变范围对动态应变时效（DSA）的影响。比较了不同应变范围下的应力降和硬化率的变化。应力降的变化归因于空位浓度对应变范围的依赖性。 600℃时的硬化率高于20℃时的硬化率，并且在较大的应变范围内会发生二次硬化行为。分析了DSA对周期数和不同阶段的波类型的依赖性。在最初的几个循环中观察到明显的DSA，然后减弱锯齿状的产量。但是，锯齿形屈服在疲劳破坏之前再次发生。锯齿状屈服的差异可以用不同周期的原子气氛类型来解释。对于较小的应变范围，可以观察到锯齿波，但是对于较大的应变范围，可以在不同的循环中找到A，B，A + B，C和B + C的锯齿波。最后，通过扫描电子显微镜（SEM）表征了裂纹在裂纹表面的形核和扩展。

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  • 来源
    《Journal of Materials Research》 |2016年第5期|627-634|共8页
  • 作者

    Dan Jin; Jianghua Li; Ning Shao;

  • 作者单位

    School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China;

    School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China;

    School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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