Investigation of defects and nanoparticles with martensitic phase transformation in surface nanostructured 316L stainless steel by slow-positron beam

2010 ◽  
Vol 25 (3) ◽  
pp. 587-591 ◽  
Author(s):  
Xiaowei Wang ◽  
Liangyue Xiong ◽  
Xiaoguang Liu ◽  
Gang Liu ◽  
Chunlan Zhou ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Phase Transformation ◽  
316L Stainless Steel ◽  
Positron Beam ◽  
Martensite Phase ◽  
Surface Mechanical Attrition Treatment ◽  
Annihilation Radiation ◽  
Slow Positron ◽  
Mechanical Attrition ◽  
Line Shape Parameter

In this article, we investigated the defects introduced by surface mechanical attrition treatment by Doppler-broadening spectroscopy of positron annihilation radiation in surface-nanostructured 316L stainless steel. Through the measurement of different thinning layers in the samples treated for 15 min, the slope of line shape parameter S versus wing parameter W curves showed three different values with depth responding to the change of defect configuration. An unusual change of S and W parameters near the surface was mainly from the effect of quantum-dot-like state caused by the formation of nanoparticles. Based on the change of S ˜ W with depth, the martensite phase transformation induced by strain could be estimated to occur within a depth of 35 μm.

Influence of Surface Mechanical Attrition Treatment on the oxidation behaviour of 316L stainless steel

2018 ◽  
Vol 136 ◽  
pp. 188-200 ◽  
Author(s):  
S. Benafia ◽  
D. Retraint ◽  
S. Yapi Brou ◽  
B. Panicaud ◽  
J.L. Grosseau Poussard
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Oxidation Behaviour ◽  
Surface Mechanical Attrition Treatment ◽  
Mechanical Attrition

Mechanical Properties of 316L Stainless Steel with Nanostructure Surface Layer Induced by Surface Mechanical Attrition Treatment

2007 ◽  
Vol 353-358 ◽  
pp. 1810-1813 ◽  
Author(s):  
Xiao Hua Yang ◽  
Wei Zhen Dui ◽  
Gang Liu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Surface Layer ◽  
316L Stainless Steel ◽  
Hardened Layer ◽  
Surface Mechanical Attrition Treatment ◽  
Mechanical Attrition ◽  
Nanostructure Surface ◽  
Nanocrystalline Layer

The mechanical properties of the 316L stainless steel subjected to surface mechanical attrition treatment (SMAT) have been studied, these properties are hardness, tensile properties and wear resistance. The research shows that the thickness of the hardened layer increases with the increasing of the treating time. The refined microstructure in the treated layer led to increasing in hardness, strength, and wear resistance. It is obvious that the surface layer hardness and bulk yield strength are increasing when the SMAT time reaches 5 minutes. The increase of surface layer wear resistance is obvious when the SMAT time is 15 minutes. The SEM observation of the wear scars shows that the nanocrystalline layer might reduce the effect of adhesive wear of 316L stainless steel. Therefore, the wear mechanism changes from adhesive abrasion to grinding particle abrasion after SMAT.

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.

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