The Kinetics of Austenization Process of T91 Ferritic Heat-Resistant Steel
By fitting the calculated transformed fraction according to developed phase-transformation model to the experimental data obtained by differential dilatometry, the kinetic characteristics of the austenitization process in T91 steels have been investigated. According to the kinetic parameters fitted, we recognize that the nucleation and growth of austenite grain are mainly controlled by the diffusion of carbon in ferritic and austenite respectively. In addition, by increasing the diffusion active energy of carbon in austenite, carbides hinder the motion of interface and thus refine austenite grain.
L. F. Zhang and Y. C. Liu, "The Kinetics of Austenization Process of T91 Ferritic Heat-Resistant Steel", Advanced Materials Research, Vols. 317-319, pp. 42-47, 2011