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首页> 外文会议>SEM IX International Congress on Experimental Mechanics June 5-8, 2000 Orlando, Florida >Evaluation of the Quantitative Fatigue Strength of Case Hardened Cr-Mo steel Alloy by Case Depth
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Evaluation of the Quantitative Fatigue Strength of Case Hardened Cr-Mo steel Alloy by Case Depth

机译：用表层深度评估表面硬化Cr-Mo钢合金的定量疲劳强度

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摘要

Induction surface hardening is widely used to enhance local strength and hardness. Fatigue characteristics of the case hardened steel are different from that of raw steel, and the analysis for this is very complicated. It is because that unpredictable failure or large scatter of fatigue life are observed by case hardening. By this reason, the existing fatigue strength prediction method developed for raw metal cannot be applied without any correction. So, in this study, Cr-Mo steel alloy(SCM440) was used to show the effect of residual stress and micro hole on the fatigue strength for base metal and induction surface hardened specimen. In addition, the fatigue characteristic between surface hardened and fully hardened steel is somewhat different. It is caused by hardness distribution, residual stress and inclusions etc.. For the prediction of fatigue strength, the fatigue characteristics of case hardening such as crack initiation position, residual stresses, inclusion size and distribution of micro vickers hardness etc. must be considered. Modified prediction equation of fatigue strength is proposed and predicted results show good accuracy.
机译：感应表面淬火被广泛用于增强局部强度和硬度。渗碳钢的疲劳特性与生钢的疲劳特性不同，对此的分析非常复杂。这是因为通过表面硬化可以观察到无法预测的失效或疲劳寿命的大范围分散。因此，如果不进行任何校正，就无法应用针对金属原料开发的现有疲劳强度预测方法。因此，在本研究中，使用Cr-Mo钢合金（SCM440）来显示残余应力和微孔对贱金属和感应表面硬化试样的疲劳强度的影响。另外，表面硬化钢和完全硬化钢之间的疲劳特性有所不同。这是由硬度分布，残余应力和夹杂物等引起的。为了预测疲劳强度，必须考虑表面硬化的疲劳特性，例如裂纹的起始位置，残余应力，夹杂物的大小和显微维氏硬度的分布等。提出了改进的疲劳强度预测方程，预测结果具有较好的准确性。

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