Influence of initial microstructures on intercritical annealing behaviour in a medium Mn steel
- Authors
- Choi, Yong Hoon; Ryu, Joo Hyun; Lee, Sea Woong; Lee, Kyooyoung; Lee, Byeong Joo; Kim, Jin-Kyung; Lee, Jae Sang; Suh, Dong-Woo
- Issue Date
- Nov-2019
- Publisher
- Maney Publishing
- Keywords
- Medium Mn TRIP steels; austenite; reverse transformation; annealing; martensite; diffusion
- Citation
- Materials Science and Technology, v.35, no.17, pp.2092 - 2100
- Indexed
- SCIE
SCOPUS
- Journal Title
- Materials Science and Technology
- Volume
- 35
- Number
- 17
- Start Page
- 2092
- End Page
- 2100
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/2026
- DOI
- 10.1080/02670836.2018.1475445
- ISSN
- 0267-0836
- Abstract
- The present work reports the effect of different initial microstructures on reverse transformation kinetics and morphologies of austenite formed during intercritical annealing in Fe-0.14C-7Mn-1Si (wt-%) medium Mn steel. Three different initial microstructures were produced by cold-rolling and cold-rolling followed by austenitisation at 820?C and 900?C. The specimen austenitised at higher temperature shows lath-type austenite after intercritical annealing. The difference in austenitisation temperature leads to different Mn distribution in martensitic initial microstructures, thereby leading to a difference in morphology of austenite. The inhomogeneous Mn profiles in initial microstructures also affect reverse transformation kinetics of austenite upon intercritical annealing. The presence of Mn-enriched regions accelerates austenite growth at an early stage of intercritical annealing but retards the transformation kinetics afterwards. This paper is part of a Thematic Issue on Medium Manganese Steels.
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