Low alloy steels were subjected to peening with fine iron sulfide particles (FeS-peening) under ambient conditions to transfer a layer of such particles, which can improve seizure resistance and sliding properties, and thus enhance the fatigue characteristics of the steel. This process was performed without the use of aqueous NaSO and the specimens were assessed using electron probe microanalysis and rotating bending fatigue tests. Treated specimens exhibited higher fatigue limits as a result of high degree of compressive residual stress generated on the steel surface. The effects of residual stress on the fatigue limit were quantitatively investigated using a modified Goodman diagram. Sample cross-sections were observed using electron backscattered diffraction, which confirmed that FeS-peening formed fine surface grains. Grain refinement was determined to be at least partly responsible for the improved fatigue properties of the steel following FeS-peening.

中文翻译：

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细小硫化铁颗粒喷丸对低合金钢旋转弯曲疲劳性能及硫化铁层形成的影响


在环境条件下对低合金钢进行细小的硫化铁颗粒喷丸（FeS喷丸），以转移一层此类颗粒，这可以提高抗咬合性和滑动性能，从而增强钢的疲劳特性。该过程在不使用 Na2SO4 水溶液的情况下进行，并使用电子探针微量分析和旋转弯曲疲劳测试对样品进行评估。由于钢表面产生高度的残余压应力，处理过的样品表现出更高的疲劳极限。使用修正的古德曼图定量研究了残余应力对疲劳极限的影响。使用电子背散射衍射观察样品横截面，证实 FeS 喷丸形成了细小的表面晶粒。经确定，晶粒细化至少部分原因是 FeS 喷丸后钢的疲劳性能得到改善。