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Solidification Microsegregation and Hot Ductility of Fe-Mn-C-Al-xNb TWIP Steels
- Authors
- Kwon, Min Hyeok; Kim, Jin-Kyung; Bian, Jian; Mohrbacher, Hardy; Song, Taejin; Kim, Sung Kyu; De Cooman, Bruno C.
- Issue Date
- Nov-2018
- Publisher
- ASM International
- Citation
- Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v.49A, no.11, pp.5509 - 5523
- Indexed
- SCIE
SCOPUS
- Volume
- 49A
- Number
- 11
- Start Page
- 5509
- End Page
- 5523
- ISSN
- 1073-5623
- Abstract
- The influence of Nb addition on casting microstructures and high-temperature mechanical properties of Fe-Mn-C-Al-xNb TWIP steels was analyzed by phase-field modeling and experiments. Phase-field simulations showed that Mn, Nb, and C are enriched in inter-dendritic regions while Al is enriched in dendritic regions during solidification process of the investigated TWIP steels. Both phase-field simulations and microstructural characterization show that NbC precipitates are preferentially present near inter-dendritic boundaries. Nb addition slightly reduces hot ductility of the investigated steel at 1173 K (900 degrees C) while the Nb-added TWIP steels show better hot-ductility than the reference steel for deformation temperatures above 1373 K (1100 degrees C). NbC precipitates and inter-dendritic distances appear to be the most important variables that affect hot-ductility behavior of the investigated TWIP steels. (C) The Minerals, Metals & Materials Society and ASM International 2018.
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Related Researcher
- Kim, Jin kyung
- ERICA 첨단융합대학 (ERICA 신소재·반도체공학전공)