Comparative study of the effects of surface mechanical attrition treatment and conventional shot peening on low cycle fatigue of a 316L stainless steel
Comparative study of the effects of surface mechanical attrition treatment and conventional shot peening on low cycle fatigue of a 316L stainless steel
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DOI：
10.1016/j.surfcoat.2018.06.041
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发表时间：
2018-09
影响因子：
5.4
通讯作者：
J. Zhou;D. Retraint;Zhidan Sun;P. Kanouté
中科院分区：
文献类型：
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作者：
J. Zhou;D. Retraint;Zhidan Sun;P. Kanouté
对比研究了表面机械磨损处理（SMAT）和常规喷丸强化处理（CSP）对316L不锈钢表面特性和低周疲劳性能的影响。为此，对处理样品的表面形貌、残余应力和加工硬化进行了评估。CSP和SMAT在相同的Almen强度和相同的覆盖范围下进行。为了比较这两种方法对所研究钢的疲劳性能的影响，进行了总应变控制LCF试验。结果表明：经SMAT和CSP处理的试样具有相似的循环应力幅值演变趋势，且机械强度高于未处理的试样；与SMATed试样相比，经CSP处理的试样在低应变幅值（±0.5%）下的疲劳寿命较高，但在高应变幅值（±1.25%）下的疲劳寿命较低。通过对表面形貌、显微组织、残余应力及其松弛、断口等不同特征的分析，对疲劳寿命结果进行了讨论。
In this work, the effects of surface mechanical attrition treatment (SMAT) and conventional shot peening (CSP) are comparatively studied on the surface characteristics and low cycle fatigue (LCF) properties of a 316L stainless steel. For this purpose, surface topography, residual stress and work hardening are evaluated on the treated samples. Both CSP and SMAT are performed with the same Almen intensity and the same coverage. Total strain controlled LCF tests are carried out in order to compare the effects of these two techniques on the fatigue properties of the studied steel. The results show that the samples treated by SMAT and CSP exhibit similar trends of cyclic stress amplitude evolution, and higher mechanical strength than the untreated samples. However, the samples treated by CSP manifest higher fatigue life under low strain amplitude (±0.5%), but lower fatigue life under high strain amplitude (±1.25%), compared to the SMATed samples. The fatigue life results are discussed based on the analysis of different characteristics including surface topography, microstructure, residual stress and its relaxation, as well as fracture surfaces.