A new two-step selective laser remelting of 316L stainless steel: process, density, surface roughness, mechanical properties, microstructure

Abstract

A new two-step selective laser remelting (SLR) process was proposed to fabricate 316L stainless steel. The density, surface roughness, and mechanical properties were investigated by a multifunctional density tester, surface roughness meter, and tensile testing machine. Compared with the single-melting selective laser melting (SLM) process, the relative density, surface roughness (R _a ), ultimate tensile strength, yield strength, elastic modulus, and elongation reached 99.31%, 6.67 μ m, 725 MPa, 643 MPa, 13.95 GPa, and 40.8%, respectively. In addition, the microstructure and fracture characteristics were studied by OM, SEM, and EDS. The results showed little unmelted powder and fewer defects (balling, spatter, and cracks). In addition, a closer and smoother connection between the welds and equiaxed cell were obtained by the SLR process.

Keywords

• SLM
• SLR
• mechanical properties
• remelting
• defects
• fracture