This paper focuses on the relationship between the fatigue performance and the presence of process or corrosion related defects for a 316L stainless steel manufactured by Laser Powder Bed Fusion. The fatigue responses of three batches (polished, pre-corroded and with an Electric Discharge Machined (EDM) defect) were investigated. A good correlation between Murakami’s $\sqrt{area}$ parameter and the fatigue strength was observed. Defect morphology does not seem to be an important factor for crack initiation as ellipsoidal corrosion pits, hemispherical EDM defects and flat lacks of fusion, although very different in terms of shape, are just as harmful at equivalent sizes.

本文重点研究了激光粉末床融合制造的 316L 不锈钢的疲劳性能与工艺或腐蚀相关缺陷的存在之间的关系。研究了三个批次（抛光、预腐蚀和具有电火花加工 (EDM) 缺陷）的疲劳响应。村上隆之间的良好相关性$\sqrt{\mathrm{一种}r\mathrm{电子}\mathrm{一种}}$参数和疲劳强度进行观察。缺陷形态似乎不是裂纹萌生的重要因素，因为椭圆形腐蚀坑、半球形 EDM 缺陷和平面未熔合，虽然在形状方面非常不同，但在同等尺寸下同样有害。