| Effect of Surface Mechanical Attrition Treatment on the Microstructure and Mechanical properties of 316 Stainless Steel |
| Paper ID : 1185-UFGNSM-FULL |
| Authors: |
|
elham rajabi toutkaboni * Unit No.14,No.3, Namayandegi Street, Azadi Ave. |
| Abstract: |
| In the past decade, severe plastic deformation (SPD) approaches, such as equal channel angular pressing (ECAP), high-pressure torsion (HPT), groove pressing (GP) and Surface mechanical attrition treatment (SMAT) have been applied to produce ultra-fine grained (UFG) alloys. SMAT is considered to be an effective route to create the nanostructured layer in the treated surface of metals. The thickness of ultrafine layer due to SMAT is a significant factor on surface properties. The thickness of ultrafine layer depends on SMAT parameters such as ball size, impacting time and frequency. In this study, the effect of impacting frequency and impacting time on the thickness of ultrafine grain size of 316 stainless steel was studied. On the other hand, the effect of these parameters on mechanical properties and wear behavior of SMATed 316 stainless steel was also investigated. To characterize the microstructure, scanning electron microscope, OM and X-ray diffraction were used. The mean grain size was calculated by XRD. To evaluate mechanical properties of samples tensile test and Vickers micro hardness were used. Micro hardness experimental results implied the micro hardness obviously increased on the surface layer and it also showed the variation of micro hardness at the cross section. However, the SMAT led to high density of crystalline defects such as grain boundaries (subgrain boundaries) and dislocations |
| Keywords: |
| Surface Mechanical Attrition Treatment, 316 Stainless Steel, Mechanical Properties, Microstructure |
| Status : Paper Accepted (Poster Presentation) |
