Mechanical and Damping Properties of Selective Laser‐Melted Fe–Mn Damping Alloy

Fe–Mn damping alloys, which integrate high strength with superior damping capacity, are particularly suitable for manufacturing components with complex lattice or topological structures via additive manufacturing, enabling integrated lightweight and high‐damping designs for load‐bearing parts. In this work, Fe–20 Mn damping alloy was fabricated by selective laser melting (SLM), and its mechanical and damping properties were investigated. The as‐SLMed alloy exhibits a fine microstructure, offering a tensile strength of 750 MPa, a yield strength of 505 MPa, and a damping performance Q −1 of 0.023 (at 6 × 10 −4 strain). Annealing further improves both properties, achieving a yield strength of 621 MPa and Q −1 of 0.03. The enhancement is attributed to recrystallization, which transforms the high‐defect, non‐equilibrium SLMed state into a more stable structure strengthened by grain refinement and homogenized phase boundaries. Moreover, the increased stacking fault probability in ε and γ phases, along with a higher density of ε ‐martensite variant boundaries and ε / γ interfaces after annealing, raises the density of mobile interfaces, thereby directly boosting damping energy dissipation. This study systematically reveals the synergistic regulation of mechanical and damping properties in SLM‐formed Fe–Mn alloys through heat treatment.