|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Tailoring The Microstructure for Superior Mechanical Properties and Wear Resistance of Direct Energy Deposited AISI D2 Tool Steel via Post-Heat Treatments.
||Jung-Hyun Park, Kyu-Sik Kim, Jin-Young Kim, Yong-Mo Koo, *Kee-Ahn Lee
|On-Site Speaker (Planned)
AISI D2 is one of cold work tool steels that has exceptional mechanical properties and wear resistance. In this study, direct energy deposition (DED), an advanced manufacturing process for high complex geometrical parts and repair applications, was applied to fabricate AISI D2 tool steel with superior properties. Moreover, the effect of various post-heat treatments on the microstructural evolution, mechanical properties, and wear resistance were investigated. Samples were fabricated in nearly defect-free bulk rods and plates without hot crack and delamination by using pre-heating system. Unexpected high fraction of austenite and fine M7C3 eutectic network were observed in as-built specimen, and martensite decorated with needle-type M7C3 carbides were formed after heat treatments. Hardness and compressive yield strength were increased after heat treatment. Tensile strength increased from 1,016MPa to 1,794MPa whereas the elongation decreased from 2.4% to 0.8%. Based on the results, the relationship between microstructure and deformation behavior was also discussed.