Microstructure evolution during isochronal annealing of a 42% cold rolled TRIP-TWIP steel

Authors

Sudipta Pramanik, University of WollongongFollow
Ahmed A. Saleh, University of WollongongFollow
Dagoberto Brandao Santos, University Federal de Minas Gerais
Elena V. Pereloma, University of WollongongFollow
Azdiar A. Gazder, University of WollongongFollow

RIS ID

102405

Publication Details

Pramanik, S., Saleh, A. A., Santos, D. B., Pereloma, E. V. & Gazder, A. A. (2015). Microstructure evolution during isochronal annealing of a 42% cold rolled TRIP-TWIP steel. IOP Conference Series: Materials Science and Engineering, 89 012042-1-012042-8.

Abstract

A high manganese TRIP-TWIP steel was cold rolled to 42% thickness reduction and isochronally annealed between 600 to 900 °C for 300 s. The microstructural evolution during annealing was studied by high resolution electron back-scattering diffraction. After cold rolling, the steel comprised predominant fraction of α′-martensite, a small fraction of blocky ε-martensite and a trace fraction of retained austenite (γ). During annealing, the reversion of ε and α′ martensite to γ was followed by the recrystallisation of γ. While the processes of reversion to and recrystallisation of γ were completed by 700 °C, further annealing between 750 to 900 °C led to γ grain growth. A novel method to delineate the γ-γ grain boundaries was developed in order to accurately quantify γ grain size and subsequently the activation energy for γ grain growth.