Numerical modeling of solidification and subsequent transformation of Fe-Cr-Ni alloys
- Nippon Steel Corp., Chiba (Japan). Steel Research Labs.
- Nippon Steel Corp., Kawasaki (Japan). Advanced Materials and Technology Labs.
A computational method for the analysis of phase transformation involving solidification was developed with the assumption of thermodynamic equilibria at interfaces. The region of interest was divided into finite segments, and solute diffusion across the segments was computed by the use of the direct finite difference method (FDM). Simultaneously, thermodynamic equilibrium at each interface was updated at every step of the diffusion analysis to determine the location of the interfaces. The temperature decrease and the increment of fraction solid were calculated based on thermal balance, including a heat extraction condition. Solid state transformation from [delta] to [gamma] phase within each FDM segment was modeled by the use of a Clyne-Kurz (C-K) type analysis with assumptions of complete mixing of solutes in the [delta] phase and limited back diffusion in the [gamma] phase. The calculation results were compared with welding solidification experiments in the iron-chromium-nickel ternary system. Good agreement was obtained with respect to solute distribution and residual fraction of [delta] phase over different compositions and solidification modes of the alloys used.
- OSTI ID:
- 7029562
- Journal Information:
- Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 25:6; ISSN 0360-2133
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
SOLIDIFICATION
IRON BASE ALLOYS
NICKEL ALLOYS
CALCULATION METHODS
MATHEMATICAL MODELS
PHASE DIAGRAMS
TERNARY ALLOY SYSTEMS
ALLOY SYSTEMS
ALLOYS
DIAGRAMS
IRON ALLOYS
PHASE TRANSFORMATIONS
360102* - Metals & Alloys- Structure & Phase Studies