In this study, the rotating‐bending fatigue behavior in water of a 13Cr‐4Ni martensitic stainless steel as substrate, with two different thermochemical treatments and with a thermal sprayed coating was characterized. Hardness profiles were measured by instrumented nanoindentation. X‐ray diffraction was used to identify the phases and measure the residual stresses, and the fracture micromechanisms were characterized by scanning electron microscopy. The results show increases of 27%, 74%, and 95% in the fatigue strength from WC‐10Co‐4Cr coating, plasma nitriding and salt bath nitrocarburizing, respectively, compared with that untreated material at 10⁶ cycles. The good fatigue behavior of the treated surfaces was found to result from an increase in the surface hardness and the generated compressive stresses that delay crack initiation.

中文翻译：

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通过渗氮和热喷涂表面处理提高水力机械13Cr‐4Ni CA6NM钢的疲劳强度

在这项研究中，以13Cr-4Ni马氏体不锈钢为基材，经过两种不同的热化学处理和热喷涂涂层，表征了其在水中的旋转弯曲疲劳行为。硬度轮廓通过仪器化的纳米压痕测量。X射线衍射用于鉴定相并测量残余应力，并通过扫描电子显微镜表征断裂的微观机制。结果表明，与未处理材料相比，WC-10Co-4Cr涂层，等离子渗氮和盐浴氮碳共渗的疲劳强度分别提高了27％，74％和95％，而在10 ⁶周期。已发现，经过处理的表面具有良好的疲劳性能，这是由于表面硬度的提高和所产生的压缩应力（这些应力会延迟裂纹的产生）而导致的。