Journal
ACTA MATERIALIA
Volume 91, Issue -, Pages 10-18Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.03.021
Keywords
Bainite; Steel; Carbon enrichment; EPMA; Incomplete transformation
Funding
- Creation of Innovative Functions of Intelligent Materials on the Basis of Element Strategy by CREST Basic Research Program
- Ministry of Education, Culture, Sports, Science, and Technology [23360316 (2011-2013)]
- Tohoku University
- Tsinghua University
- National Natural Science Foundation of China [51471094]
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The overall kinetics and carbon enrichment in austenite during the incomplete isothermal bainite transformation in Fe-0.1C-1.5Mn(0, 0.03, 0.3, 0.5, 1)Mo (mass%) alloys were investigated with quantitative metallography and Electron Probe Microanalysis in the transformation temperature range of 773-873 K. The incomplete transformation appears at 823-873 K when Mo addition exceeds 0.3 mass%; at 773 K substantial carbide precipitation accompanies bainite transformation and no transformation stasis is observed. Transformed fractions in the stasis stage are hardly affected by prior austenite grain size. Carbon concentrations in austenite in the stasis stage are lower than To line and decrease with the increase of Mo addition and temperature. To limit, solute drag and WBs limit theories are used to examine the experimentally measured carbon concentration limits in austenite, and their respective flaws are pointed out. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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