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Metals 2019, 9(3), 369; https://doi.org/10.3390/met9030369

Effect of Grain Size Distribution on Recrystallisation Kinetics in an Fe-30Ni Model Alloy

1
Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UK
2
School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK
*
Author to whom correspondence should be addressed.
Received: 27 February 2019 / Revised: 20 March 2019 / Accepted: 21 March 2019 / Published: 22 March 2019
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Abstract

This paper discusses the role of grain size distribution on the recrystallisation rates and Avrami values for a Fe-30 wt. % Ni steel, which was used as a model alloy retaining an austenitic structure to room temperature. Cold deformation was used to provide uniform macroscopic strain distributions (strains of 0.2 and 0.3), followed by recrystallisation during annealing at 850–950 °C. It was shown that the Avrami parameter was directly related to the grain size distribution, with a lower Avrami exponent being seen for a larger average and wider grain size distribution. A method to predict the Avrami exponent from the grain size distribution was proposed. In situ heating in an SEM with EBSD showed the recrystallisation kinetics to be affected by differences in stored energy and nucleation in the different grain sizes supporting the proposed relationship. View Full-Text
Keywords: recrystallisation; grain size distribution; JMAK model; in situ EBSD recrystallisation; grain size distribution; JMAK model; in situ EBSD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ji, M.; Davis, C.; Strangwood, M. Effect of Grain Size Distribution on Recrystallisation Kinetics in an Fe-30Ni Model Alloy. Metals 2019, 9, 369.

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