Enhanced strength-ductility synergy in stainless steel 316L through hierarchically tailored microstructure via laser-based repair deposition
Man Jae SaGong, Rae Eon Kim, Jeong‐Ah Lee, Hyojin Park, Soung Yeoul Ahn, Shuai Xu, Haiming Zhang, Renhao Wu, Hyoung Seop Kim
Abstract
Repair offers significant time—cost savings and durability by reusing existing parts efficiently. Prior to implementation of repaired parts, it is crucial to clarify mechanical properties and deformation mechanisms to ensure proper performance. In this study, a repair deposition was performed on the groove of wrought stainless steel 316L using the same material powder. The repaired sample exhibited an excellent combination of ductility and strength (T.EL: 58%, YS: 407 MPa, UTS: 673 MPa) compared to the wrought counterpart. With heterogeneity in microstructure, the hetero-deformation-induced strengthening of the repaired sample resulted in a synergy of strength-ductility combinations.