This study deals with the influence of the austenite grain size and deformation state on the mechanism and kinetics of bainite transformation in several low-alloy steels differing by their C content. Nucleation and growth conditions are thoroughly modified when the austenite grain size becomes of the same order as the length of the individual bainitic ferrite platelets. As a consequence, the kinetics show some peculiarities. The austenite prior deformation also influences in a large way the morphology of the bainite - retained austenitc, microstructure.
Godet, S., Harlet, P., Delannay, F., & Jacques, P. (2003). Critical assessment of the bainite transformation of finely grained and deformed austenite. Materials Science Forum, 426-4, 1433-1438. https://hdl.handle.net/2078.5/141639 (Original work published 2003)