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Influence of initial microstructures on intercritical annealing behaviour in a medium Mn steel

Title
Influence of initial microstructures on intercritical annealing behaviour in a medium Mn steel
Authors
Yong Hoon ChoiJoo Hyun RyuSea Woong LeeKyooyoung LeeLEE, BYEONG JOOJin-Kyung KimJae Sang LeeDong-Woo Suh
Date Issued
22-Nov-2019
Publisher
TAYLOR & FRANCIS LTD
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.
Keywords
TRANSFORMATION-INDUCED PLASTICITY; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; TRIP STEELS; MARTENSITE; AUSTENITE; CARBON
URI
http://oasis.postech.ac.kr/handle/2014.oak/95881
ISSN
0267-0836
Article Type
Article
Citation
MATERIALS SCIENCE AND TECHNOLOGY, vol. 35, no. 17, page. 2092 - 2100, 2019-11-22
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 LEE, BYEONG JOO
Dept of Materials Science & Enginrg
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