Tailoring the microstructural and mechanical properties of 316L stainless steel manufactured by laser powder bed fusion

• DOI: 10.1016/j.jmrt.2023.07.158
• Publication Date: 2023-07-20T13:56:19Z
• Authors: Wei Liu; Cheng-song Liu; Yong Wang; Hua Zhang; Jie Li; Yuan-yuan Lu; Li Xiong; Hong-wei Ni
• Keywords: Ductility (Earth science); Deformation mechanism; Work hardening

The grains, cellular structures, dislocation densities, and oxides in L-PBF 316LSS were systematically characterized. microstructure evolution mechanical properties closely associated with the scanning speed. sizes of grains significantly decreased increasing speed, while density remained relatively stable for speeds from 500-900 mm·s-1 increased when speed exceeded 900 mm·s-1. tensile samples exhibited obvious anisotropic properties, TD showed higher strength, attributed to strong <110> crystallographic orientation, <111>-oriented facilitated activation generation deformation twins. Importantly, substructures traversed by twins, leading their subdivision dissociation. discontinuous tangles interacted twins provided a continuous work hardening capability, resulting superior ductility BD samples. Reasonable agreement between yield strength experimental results theoretical calculations was achieved, suggesting that can be grain boundary strengthening, oxide dispersion strengthening behavior. Collectively, this study revealed mechanism 316L stainless steel, which provide guidance development new alloy materials.