About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Ultrafine-grained and Heterostructured Materials (UFGH XII)
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Presentation Title |
Ultrafine δ-ferrite and Transformation-induced Plasticity in Laser Melting Deposition Processed 304L Austenitic Stainless Steel |
Author(s) |
Jung Gi Kim, Jonghyun Jeong, Yukyeong Lee, Jeong Min Park, Dong Jun Lee, Hyoung Seop Kim, Taehyun Nam, Hyokyung Sung, Jae Bok Seol |
On-Site Speaker (Planned) |
Jung Gi Kim |
Abstract Scope |
Rapid melting and solidification cycles during laser-based additive manufacturing create non-equilibrium microstructure in the stainless steels including Cr/Mo segregations that induce an ultrafine δ-ferrite in the matrix. Contradictory to the coarse δ-ferrite in the conventional stainless steels, ultrafine δ-ferrite in the additively manufactured stainless steels has a coherency with γ-austenite matrix and interacts with dislocations. Because the interaction between coherent metastable δ-ferrite and dislocations may contributes to the mechanical property of additively manufactured alloys, in the present work, the role of ultrafine δ-ferrite on the plastic deformation behavior of laser melting deposition processed 304L stainless steel was investigated. The α’-martensitic transformation behavior depends on the initial grain size of 304L stainless steels that results into the different mechanical property in the different processing condition. Moreover, the ultrafine δ-ferrite maintains a coherency with γ-austenite matrix even in high deformation region and prolongs the plasticity of additively manufactured 304L stainless steel. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Characterization |