Influence of microstructure and microdefects on long-term fatigue behavior of a Cr–Mo–V steel
Influence of microstructure and microdefects on long-term fatigue behavior of a Cr–Mo–V steel
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DOI：
10.1016/j.msea.2012.03.030
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发表时间：
2012-06
期刊：
影响因子：
6.4
通讯作者：
Mingliang Zhu;F. Xuan;Jian Chen
中科院分区：
文献类型：
--
作者：
Mingliang Zhu;F. Xuan;Jian Chen
在370°C下对Cr-Mo-V钢进行了超高周疲劳（VHCF）试验，研究了显微组织和微缺陷对疲劳行为的影响。双相S-N曲线由试件表面向内部转变。观察到一种新的椭圆型鱼眼图案，其起源于显微组织的不均匀性。在高周疲劳区，显微组织对疲劳性能的影响大于显微缺陷的影响。相比之下，在VHCF状态下，疲劳性能由夹杂物主导，并且可以通过使用建议的寿命控制参数Z来解释。
Very high cycle fatigue (VHCF) tests at 370°C were carried out for a Cr–Mo–V steel to investigate the influence of microstructure and microdefects on fatigue behavior. Duplex S–N curves were obtained with the crack initiation switched from specimen surface to interior. A new elliptical type of fish-eye pattern originated from microstructure heterogeneities was observed. In the high cycle fatigue regime, the influence of microstructures on fatigue performance was greater than that of microdefects. In the VHCF regime, by contrast, the fatigue performance was dominated by inclusions and could be interpreted by using the proposed life controlling parameter Z.