Effect of Shot Peening on Microstructure and Mechanical Properties of 316L Stainless Steel Prepared by 3D Printing with Different Forming Angles

This paper employs OM, XRD, EBSD and mechanical properties testing to investigate the influence of shot peening on the microstructure and mechanical properties of 3D-printed 316L stainless steel. The following explores changes in the microstructure and mechanical properties of 316L stainless steel by 3D printing with different forming angles after shot peening: (1) As the forming angle increased from 0 & DEG; to 90 & DEG;, the microstructure of 3D-printed 316L stainless steel became significantly refined, and the thickness of ultrafine microstructure in the surface layer increased from 5 to 70 & mu;m; (2) the hardness of the material increased from 471 HV to 482 HV as the forming angle increased from 0 & DEG; to 90 & DEG;; (3) According to the EBSD results, the enhanced hardness was attributed to refinement hardening and dislocation hardening. Moreover, the maximum yield strength (YS), ultimate tensile strength (UTS), and tensile elongation (TE) of 845, 862 MPa, and 17.8%, respectively, were obtained when the forming angle was 90 & DEG;.