About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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Presentation Title |
F-29: Effect of Post-heat Treatment on Microstructure and Mechanical Behavior of 5% Cr Cold Work Tool Steel Manufactured via Laser Direct Energy Deposition
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Author(s) |
Jung-Hyun Park, Jin-Young Kim, Hyo-Yun Jung, Kee-Ahn Lee |
On-Site Speaker (Planned) |
Jung-Hyun Park |
Abstract Scope |
Crack-free 5 wt% Cr cold work tool steel with high density was fabricated by the direct energy deposition (DED) process for the first time. The initial microstructure was mainly composed of martensite and austenite boundary regions, with a Cr, Mo, V-rich carbide network formed along the build direction. After post-heat treatment, the microstructure transformed into acicular martensite, and the carbide network was separated into block-type carbides. The average ultimate tensile and yield strength were 1949.4 ± 28.2 MPa and 1299.5 ± 15.9 MPa and elongation was 0.7% after post-heat treatment. Additionally, the Vickers hardness and compressive yield strength measured 649.1 ± 9.3 and 2312.7 ± 60.5 MPa after post-heat treatment, showing superior hardness-compressive yield strength combination compared to other high-strength steel manufactured by additive manufacturing. Based on the above results, the deformation and fracture mechanism of 5 wt.% chromium tool steel manufactured by DED was also discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Mechanical Properties |