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首页> 外文期刊>Journal of Materials Engineering and Performance >High-Cycle Fatigue Behavior of Vacuum-Carburized 20Cr2Ni4 Steel with Different Case Depths
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High-Cycle Fatigue Behavior of Vacuum-Carburized 20Cr2Ni4 Steel with Different Case Depths

机译：具有不同案例深度的真空渗碳20Cr2Ni4钢的高循环疲劳行为

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摘要

High-cycle fatigue behavior of vacuum-carburized 20Cr2Ni4 steel with three different case depths was studied by using rotating bending fatigue test. The results show that fatigue strength exhibits an increase-decrease pattern with increasing effective case dept, which is regarded to be mainly due to the unavoidable change in other parameters such as residual stress and grain size in case layer besides case depth. The present data and data in the available literature suggest that a dimensionless parameter of relative case depth is more appropriate to reflect the influence of case depth on fatigue strength. Further fracture surface analysis revealed that the fatigue failure was dominated by surface crack initiation mainly due to the extremely high cleanness of the tested steel with inclusion control. It is thus concluded that both relative case depth and other parameters should be comprehensively considered in obtaining optimized fatigue performance of vacuum-carburized steel.
机译：使用旋转弯曲疲劳试验研究了具有三种不同案例深度的真空渗碳的高循环疲劳性能。 结果表明，疲劳强度表现出随着有效壳体部门的增加而增加的减少模式，这被认为是由于诸如壳体层之外的其他参数的不可避免的变化，例如残余应力和晶粒尺寸。 可用文献中的本数据和数据表明，相对案例深度的无量纲参数更适合反映壳体深度对疲劳强度的影响。 进一步的断裂表面分析显示，疲劳失效是由表面裂纹启动的主导，主要是由于测试钢的极高清洁具有夹杂物控制。 因此得出结论，在获得真空渗碳钢的优化疲劳性能方面，应全面地考虑相对壳体深度和其他参数。

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