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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue of Surface-Treated Nickel-Based Superalloy at High Temperature
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Fatigue of Surface-Treated Nickel-Based Superalloy at High Temperature

机译：高温下表面处理的镍基超合金的疲劳

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摘要

Nickel-based superalloy IN718 specimens were subjected to two surface treatments, namely shot peening (SP) and deep cold rolling (DCR) to investigate the effects of surface integrity (in particular residual stresses and cold work) on fatigue performance. Residual stress and cold work profiles of the different specimens were obtained using x-ray diffraction (XRD). Microhardness profiles were also obtained from the samples as a comparison against full width at half maximum (FWHM) from XRD in evaluation of cold work. Surface roughness effects were found to be insignificant, evident from the surface-initiated fatigue cracks in both SP and DCR specimens. Fatigue life improvements exhibited by SP and DCR specimens over the as-machined equivalent can be attributed to crack retardation due to work-hardened layer as well as compressive residual stresses.
机译：镍基超合金IN718试样进行两种表面处理，即喷丸（SP）和深冷轧（DCR），以研究表面完整性（特别是残余应力和冷工作）对疲劳性能的影响。 使用X射线衍射（XRD）获得不同标本的残余应力和冷加工型材。 从样品中也从样品中获得显微硬度曲线，例如来自XRD在冷加工中的XRD中的半最大（FWHM）的全宽度的比较。 发现表面粗糙度效应是微不足道的，从SP和DCR样本中的表面引发的疲劳裂缝中明显明显。 SP和DCR标本在诸如机械的等效物上呈现的疲劳寿命可以归因于由工作 - 硬化层以及压缩残余应力引起的裂缝延迟。

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