Comparative study of the effects of surface mechanical attrition treatment and conventional shot peening on low cycle fatigue of a 316L stainless steel

2018 ◽  
Vol 349 ◽  
pp. 556-566 ◽  
Author(s):  
J. Zhou ◽  
D. Retraint ◽  
Z. Sun ◽  
P. Kanouté
Keyword(s):  
Stainless Steel ◽  
Comparative Study ◽  
Shot Peening ◽  
316L Stainless Steel ◽  
Low Cycle Fatigue ◽  
Surface Mechanical Attrition Treatment ◽  
Cycle Fatigue ◽  
Mechanical Attrition

scholarly journals Low cycle fatigue of 316L stainless steel processed by surface mechanical attrition treatment (SMAT)

2018 ◽  
Vol 165 ◽  
pp. 15002
Author(s):  
Zhidan Sun ◽  
Jianqiang Zhou ◽  
Delphine Retraint ◽  
Thierry Baudin ◽  
Anne-Laure Helbert ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Cyclic Loading ◽  
316L Stainless Steel ◽  
Electron Backscatter Diffraction ◽  
Low Cycle Fatigue ◽  
Surface Mechanical Attrition Treatment ◽  
Cycle Fatigue ◽  
Microstructure Change ◽  
Cyclic Behaviour ◽  
Mechanical Attrition

In this work, the effect of surface mechanical attrition treatment (SMAT) on the cyclic behaviour of a 316L stainless steel under low cycle fatigue (LCF) is investigated. The LCF results are presented in the form of cyclic stress amplitude evolution for both untreated and SMATed samples. In order to better understand the microstructure change due to cyclic loading, electron backscatter diffraction (EBSD) is used to characterize the microstructure of the SMATed samples before and after fatigue tests. A microstructure gradient is highlighted for samples after SMAT from the top surface layer in nanocrystalline grains to the interior region non-affected by impacts. Under LCF loading, new slip systems are activated in the work hardened region, whereas no plastic slip is activated in the nanostructured layer. The residual stresses generated by SMAT are measured using X-ray diffraction (XRD), and their relaxations under cyclic loading are studied by taking into account the microstructure change. The cyclic behaviour of the samples in different material states is interpreted based on these investigations.

Sign in / Sign up

Export Citation Format

Share Document