Journal
SCRIPTA MATERIALIA
Volume 162, Issue -, Pages 118-120Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.11.005
Keywords
Colossal carbon supersaturation; spinodal decomposition; Paraequilibrium; Bainite
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Funding
- Max Planck Society, Germany
- ministry of human resource development, Government of India under PMRF
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This study shows for the first time, with the help of thermodynamic calculations, that the colossal carbon super saturation in delta-ferrite during low temperature carburization of stainless steels is not opposed to the concept of metastable carbon paraequilibration of delta-ferrite with the carburizing atmosphere. Rather, it is a consequence of triggering spinodal decomposition during the process of establishment of carbon paraequilibrium. This kind of paraequilibrium between spinodally decomposed ferrite and carburization atmosphere has not been recognized before. This renewed understanding explains the origin of colossal C supersaturation and also the strong variation in C solubility within a ferrite grain. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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