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Z. Y. Duan(돤쯔양),J. Suhr(서종환) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Martensitic stainless steels have gained renewed interest recently for their use in automotive, aerospace, and defense applications due to their ultra-high yield strengths and reasonable ductility. Herein, by using optimized process parameters, we report the successfully manufactured 410 martensitic stainless steel using Selective Laser Melting (SLM). Bulk 410 was printed to high part qualities with an excellent combination of tensile properties of 1,100 ± 20 Mpa yield strength, 1,280 ± 5 Mpa ultimate tensile strength, and 13.5% ± 0.6% fracture elongation. This unique performance is attributed to the alternating distribution of ferrite, ultra-fine tempered martensite, nano-sized austenite, and retained martensite produced by the SLM process. Moreover, due to the inherent heat treatment phenomenon in the SLM process, the distribution of ultrafine and heterogeneous grains is formed, which is believed to promote good ductility. This work proved that the high-performance martensitic stainless steel parts could be prepared through SLM by using appropriate processing parameters.