A new two-step selective laser remelting of 316L stainless steel: process, density, surface roughness, mechanical properties, microstructure. (4th May 2020)

• Record Type: Journal Article
• Authors: Lu, Pan; Cheng-Lin, Zhang; Hai-Yi, Liang; Liang, Wang; Tong, Liu
• Is Part Of: Materials research express. Volume 7:Number 5(2020)
• Publication Date: 2020-05-04
• Subjects: SLM -- SLR -- mechanical properties -- remelting -- defects -- fracture; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab8b86
• Languages: English
• ISSNs: 2053-1591

Abstract

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 (Ra ), 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.