Competition between nucleation and early growth of ferrite from austenite -- Studies using cellular automaton simulations

Journal Article · Mon Nov 02 04:00:00 EST 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00243-2· OSTI ID:302358

Kumar, M; Sasikumar, R ^[1]; Nair, P K ^[2]

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1. CSIR, Trivandrum (India). Regional Research Lab.
2. Indian Inst. of Tech., Madras (India). Dept. of Metallurgical Engineering

A model for the nucleation of ferrite on austenite grain boundaries and the growth of these nuclei along the grain boundary and into the grain, is developed. A cellular automaton algorithm, with transformation rules based on this model, is used to simulate the decomposition of austenite into ferrite. When performed under continuous cooling conditions, the simulations give an insight into the competition between nucleation and early growth, which determines the variation of ferrite grain size with the cooling rate and with austenite grain size. The number of ferrite grains per austenite grain, ferrite grain size and the kinetics of ferrite formation are obtained as a function of the cooling rate and austenite grain size. Contour plots of the volume fraction of ferrite in the cells at different times, enables visualization of the ferrite growth process.

• OSTI ID: 302358
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 17 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
FERRITE
GRAIN GROWTH
MATHEMATICAL MODELS
MICROSTRUCTURE
NUCLEATION