Journal
MATERIALS CHARACTERIZATION
Volume 95, Issue -, Pages 85-93Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2014.06.003
Keywords
Austenite decomposition; Phase transformations; Isothermal transformations below M-s; Low-carbon steel
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Funding
- ArcelorMittal Global RD Gent [A10/TT/1127]
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The purpose of this study is to investigate and understand the phase transformations during the decomposition of austenite, which occurs during isothermal treatments below the martensite start temperature (M-s) in a low-carbon steel. Isothermal holding treatments after rapid cooling to various temperatures (forming a controlled volume fraction of initial martensite) were carried out in a dilatometer. Results obtained by dilatometry, microstructural characterization and hardness were analyzed. This combination of results shows that the microstructures formed below the M-s temperature are mainly bainitic, mixed with tempered martensite. The kinetics of isothermal bainite formation was described by a nucleation-based transformation model. The complex competition and interactions between their transformation mechanisms during the isothermal holding at different temperature regimes are discussed. (C) 2014 Elsevier Inc. All rights reserved.
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