High-cycle fatigue (HCF) properties of 1Cr11Ni2W2MoV stainless steel impacted by a high-speed steel ball were studied by the foreign object damage (FOD) test and HCF test. The results show that the damage depth has the most obvious effect on the HCF limit of notched flat plate specimens, and the fatigue limit decreases with the increase of depth . The microcharacteristics of the FOD notch and HCF fracture of 1Cr11Ni2W2MoV stainless steel were observed by a scanning electron microscope (SEM). The results show that the microdamage features such as plastic deformation, loss of material, and microcracks promote the initiation and propagation of fatigue cracks, and the fatigue source area lies near the root of the notch. The Peterson formula and Worst Case Notch (WCN) mode were used to predict the HCF limit of flat plate specimens after FOD. The crack growth threshold was obtained by the crack growth test. The results show that the prediction results of both methods are conservative. For the notch with damage depth  mm, the prediction accuracy of the WCN model is higher (). For the notch with damage depth  mm, the prediction results of both methods have large errors (>30%) with the WCN model being slightly more accurate.

中文翻译：

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1Cr11Ni2W2MoV不锈钢板异物损坏后高周疲劳性能的预测

通过异物损伤（FOD）试验和HCF试验研究了高速钢球撞击1Cr11Ni2W2MoV不锈钢的高周疲劳（HCF）性能。结果表明，损伤深度对缺口平板试样的HCF极限影响最大，疲劳极限随着深度的增加而减小。通过扫描电子显微镜（SEM）观察了1Cr11Ni2W2MoV不锈钢的FOD缺口和HCF断裂的微观特征。结果表明，塑性变形，材料损失和微裂纹等微损伤特征促进了疲劳裂纹的产生和扩展，疲劳源区域位于缺口的根部附近。使用Peterson公式和最坏情况缺口（WCN）模式来预测FOD后平板样品的HCF极限。通过裂纹扩展测试获得裂纹扩展阈值。结果表明，两种方法的预测结果都是保守的。对于具有损伤深度的缺口 毫米，WCN模型的预测精度更高（）。对于具有损伤深度的缺口 毫米，这两种方法的预测结果都具有较大的误差（> 30％），而WCN模型的精度稍高一些。