Effect of grain size distribution on recrystallisation kinetics in a Fe-30Ni model alloy

Mo Ji, Vit Janik, Martin Strangwood, Claire Davis

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

1 Citation (Scopus)

Abstract

The high strength and toughness of microalloyed steels are derived by controlled rolling schedules, using recrystallisation to give grain refinement. A number of relationships (based on the JMAK equations) for the rate of recrystallisation, with a range of Avrami parameter values, have been reported. This paper discusses the role of grain size distribution on the recrystallisation rates and Avrami values for an austenitic model steel (Fe-30 Ni). Cold deformation has been used to provide uniform macroscopic strain distributions (strains of 0.2 and 0.3, which are equivalent to 0.27 and 0.45 strain if deformed at 850°C), followed by recrystallisation during annealing at 850 – 950°C. It is shown that the Avrami parameter is directly related to the grain size distribution, with a lower Avrami exponent being seen for a larger average and wider grain size distribution. In-situ heating in an SEM with EBSD has shown the recrystallisation kinetics to be affected by both nucleation site and local strain heterogeneity.

Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Recrystallization and Grain Growth, ReX and GG 2016
PublisherSpringer Verlag
Pages153-158
Number of pages6
ISBN (Print)9783319486260
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event6th International Conference on Recrystallization and Grain Growth, ReX and GG 2016 - Pittsburgh, United States
Duration: 17 Jul 201621 Jul 2016

Conference

Conference6th International Conference on Recrystallization and Grain Growth, ReX and GG 2016
CountryUnited States
CityPittsburgh
Period17/07/1621/07/16

Bibliographical note

This paper is not available in Pure.

Keywords

  • In-situ EBSD
  • JMAK model
  • Recrystallisation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)

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  • Cite this

    Ji, M., Janik, V., Strangwood, M., & Davis, C. (2016). Effect of grain size distribution on recrystallisation kinetics in a Fe-30Ni model alloy. In Proceedings of the 6th International Conference on Recrystallization and Grain Growth, ReX and GG 2016 (pp. 153-158). Springer Verlag. https://doi.org/10.1007/978-3-319-48770-0_22