About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Effect of Post-heat Treatment on the Microstructure and Mechanical Properties of High-carbon High-chromium Tool Steel Manufactured by Direct Energy Deposition |
Author(s) |
Jung-Hyun Park, Kyu-Sik Kim, Jin-Young Kim, Yong-Mo Koo, Jong-Bae Jeon, Kee-Ahn Lee |
On-Site Speaker (Planned) |
Jung-Hyun Park |
Abstract Scope |
AISI D2 tool steel was manufactured by using direct energy deposition (DED) process with preheating system. Post-heat treatment was applied to the as-built material. The mechanical properties of DED D2 steel were investigated with heat treatment. Samples were fabricated in bulk type with nearly defect free with over 98% density, and columnar dendrite structure was confirmed. Austenite matrix and eutectic structure were observed in the as-built specimen, and martensite matrix and secondary Cr-rich carbide were detected after heat treatment. Ultimate tensile strength was measured to be 1016MPa, and elongation was 2.4% in the case of as-built material. After heat treatment, the maximum tensile strength increased up to 1794MPa and the elongation decreased slightly to 0.8%. On the other hand, compressive yield strength of the as-built material was confirmed to be 1010MPa, and 2260MPa after heat treatment. The deformation and fracture mechanisms of DED D2 tool steels were also discussed. |