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首页> 外文期刊>Materials Science and Engineering >Fatigue crack growth behavior of a coarse- and a fine-grained high manganese austenitic twin-induced plasticity steel
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Fatigue crack growth behavior of a coarse- and a fine-grained high manganese austenitic twin-induced plasticity steel

机译：粗晶粒和细晶粒高锰奥氏体双相塑性钢的疲劳裂纹扩展行为

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摘要

The fatigue crack growth behavior of a coarse-grained (CG) and a fine-grained (FG) high manganese austenitic twin-induced plasticity (TWIP) steel has been investigated at room temperature. Crack growth tests were performed at stress ratios of 0.1 and 0.6 under the control of stress intensity factor range using three-point bending specimens. The results indicate that at the two stress ratios, the CG steel exhibits a higher fatigue crack growth resistance than the FG steel in both the near threshold and Paris regimes. Furthermore, a decreased stress ratio and an increased grain size both lead to an increased fatigue crack growth threshold. Microstructural observations reveal that cracks propagate more tortuously in the CG steel than in the FG steel, accompanied by rougher fracture surfaces, which tends to generate more roughness-induced crack closure and thus a higher fatigue threshold value. Additionally, the CG steel shows much larger plastic zone sizes ahead of the crack tip than the FG steel, suggesting that plasticity-induced crack closure may also play an important role in decreasing the fatigue crack growth rate in the CG steel. By excluding the crack closure effects, the CG steel still demonstrates a higher effective crack growth threshold than the FG steel; this is considered to be due to the increased planarity of slip in the CG steel, as compared with that in the FG steel.
机译：在室温下研究了粗晶粒（CG）和细晶粒（FG）高锰奥氏体双感应塑性（TWIP）钢的疲劳裂纹扩展行为。使用三点弯曲试样在应力强度因子范围的控制下以0.1和0.6的应力比进行裂纹扩展测试。结果表明，在两个应力比下，CG钢在接近阈值和巴黎状态下均表现出比FG钢更高的抗疲劳裂纹扩展性。此外，降低的应力比和增加的晶粒尺寸均导致疲劳裂纹扩展阈值的增加。显微组织观察表明，与FG钢相比，CG钢中的裂纹更曲折地传播，同时断裂表面更粗糙，这往往会产生更多的粗糙度引起的裂纹闭合，从而导致疲劳阈值更高。此外，CG钢比FG钢在裂纹尖端之前显示出更大的塑性区尺寸，这表明塑性诱导的裂纹闭合也可能在降低CG钢的疲劳裂纹扩展速率中起重要作用。通过排除裂纹闭合效应，CG钢仍显示出比FG钢更高的有效裂纹扩展阈值。认为这是由于与FG钢相比，CG钢的滑动平面度增加。

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  • 来源
    《Materials Science and Engineering》 |2014年第27期|160-166|共7页
  • 作者

    Penghui Ma; Lihe Qian; Jiangying Meng; Shuai Liu; Fucheng Zhang;

  • 作者单位

    State Key Laboratory o/Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;

    State Key Laboratory o/Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;

    State Key Laboratory o/Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;

    State Key Laboratory o/Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;

    State Key Laboratory o/Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fatigue crack growth; Twin-induced plasticity steel; Crack closure; Grain size;

    机译：疲劳裂纹扩展;双感应塑性钢;裂纹闭合;晶粒大小;

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