Microstructure and Mechanical Performance of PBF-LB/M 316L Stainless Steel

Abstract

The laser-based powder bed fusion of metal (PBF-LB/M) process of 316L stainless steel (SS) was systematically investigated under varying scanning spacings to assess its microstructural and mechanical properties. Optimized laser parameters were employed, and the resulting microstructure and mechanical performance were thoroughly characterized through surface and cross-sectional scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) analysis, fracture surface examination, and tensile testing. The results indicated that a scanning spacing of 0.11 mm produced the most favorable mechanical properties, characterized by a dense microstructure and refined grain morphology. These findings provide critical insights for the optimization of PBF-LB/M process parameters, contributing to the advancement of additive manufacturing techniques for 316L SS.