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Fatigue characteristics and fatigue limit prediction of an induction case hardened Cr-Mo steel alloy

机译:感应表面硬化Cr-Mo钢合金的疲劳特性和疲劳极限预测

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In this study, a structural Cr-Mo steel alloy is used to investigate the effect of residual stresses and the presence of micro-holes on the fatigue strength for the base metal and the induction case hardened specimens. The samples are tested using rotary bending. Micro-hole diameter and case hardening depth are used as varying parameters. For the prediction of the fatigue limit, the results from fatigue experiment, and fracture mechanics parameters related with local hardness and defect size are used. A previously proposed equation to predict the fatigue strength is modified and the results show good agreement with experimental data. In the proposed equation, a new parameter is introduced to consider the effect of stationary crack with defect. In addition, an empirical method of modifying residual stress effect on the fatigue strength is proposed to examine the mean stress effect of fatigue loading.
机译:在这项研究中,使用一种结构化的Cr-Mo钢合金来研究残余应力和微孔的存在对贱金属和感应淬火样品的疲劳强度的影响。使用旋转弯曲测试样品。微孔直径和表面硬化深度用作变化参数。为了预测疲劳极限,使用了疲劳实验的结果以及与局部硬度和缺陷尺寸有关的断裂力学参数。修改了先前提出的预测疲劳强度的方程,结果表明与实验数据吻合良好。在提出的方程中,引入了一个新参数来考虑带有缺陷的固定裂纹的影响。另外,提出了一种修正残余应力对疲劳强度的影响的经验方法,以检验疲劳载荷的平均应力影响。

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