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.
|Title of host publication||Proceedings of the 6th International Conference on Recrystallization and Grain Growth, ReX and GG 2016|
|Number of pages||6|
|Publication status||Published - 2016|
|Event||6th International Conference on Recrystallization and Grain Growth, ReX and GG 2016 - Pittsburgh, United States|
Duration: 17 Jul 2016 → 21 Jul 2016
|Conference||6th International Conference on Recrystallization and Grain Growth, ReX and GG 2016|
|Period||17/07/16 → 21/07/16|
Bibliographical noteThis paper is not available in Pure.
- In-situ EBSD
- JMAK model
ASJC Scopus subject areas
- Mechanics of Materials
- Materials Science(all)