Theoretical Aspects of Spinodal Decomposition in Fe-C

Kim, B. and Sietsma, J. and Santofimia, M.J. (2019) Theoretical Aspects of Spinodal Decomposition in Fe-C. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 50 (3). 1175–1184. ISSN 1073-5623

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Abstract

Carbon redistribution is known to occur during room temperature aging of Fe-C martensite. One of the proposed mechanisms in the literature by which carbon redistributes is spinodal decomposition, a thermodynamically driven reaction in which the alloy undergoes separation into carbon-rich and carbon-poor regions, giving rise to modulations in carbon concentration. Despite the substantial experimental evidence supporting the occurrence of spinodal decomposition in Fe-C, its theoretical formulation requires attention. In the present study, a theoretical framework based on the regular solution model is built for evaluating the thermodynamics of the Fe-C system, with particular emphasis on the interstitial nature of carbon atoms within the ferrite lattice. Assuming a defect-free lattice, the model explains a miscibility gap in the Fe-C system. The limitations of the current model are critically evaluated. © 2019, The Author(s).

Item Type:
Journal Article
Journal or Publication Title:
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
130718
Deposited By:
Deposited On:
25 Jan 2019 10:30
Refereed?:
Yes
Published?:
Published
Last Modified:
28 Mar 2020 05:54