Calculations of {alpha}/{gamma} phase boundaries in Fe-C-X{sub 1}-X{sub 2} systems from the central atoms model

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Metallurgical Transactions, A

OSTI ID:31961

Tanaka, T; Aaronson, H I ^[1]; Enomoto, M ^[2]

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1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
2. Ibaraki Univ. (Japan). Dept. of Materials Science

The {alpha}/{gamma} phase boundaries in Fe-C-X{sub 1}-X{sub 2} quaternary alloys (where X{sub 1} = Mn and X{sub 2} = Si, Ni, and Co, successively) are calculated from the Central Atoms model, as generalized to multi-component systems by Foo and Lupis. The interaction parameters are evaluated from the Wagner interaction parameters in ternary iron alloys reported in the literature or estimated from the interaction parameters in binary alloys. Two equilibrium conditions, para- and ortho-equilibrium, are utilized. In the Fe-C-Mn-Si system, a mixed state of equilibrium, in which orthoequilibrium is achieved with respect to C and Si while the other two substitutional elements (Fe and Mn) are assumed to be immobile (paraequilibrium), is also considered. The calculated phase boundaries are employed to evaluate the free energy change for the nucleation and the growth kinetics of proeutectoid ferrite in these alloys in companion articles.

• OSTI ID: 31961
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 3 Vol. 26; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON ADDITIONS
COBALT ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
FERRITE
IRON BASE ALLOYS
MANGANESE ALLOYS
MATHEMATICAL MODELS
MICROSTRUCTURE
NICKEL ALLOYS
PHASE STUDIES
QUATERNARY ALLOY SYSTEMS
SILICON ALLOYS