B1500HS的奥氏体化动力学分析

he isothermal and non-isothermal transformation kinetics during heating of B1500HS steel were investigated through continuous heating transformation tests with constant heating rates of 0.1, 1 , 5, 10, 20, 50 Kos-1, on a Gleeble 1500 thermal-mechanical simulator. Using the Kissinger analysis to determine the kinetics parameters of Johnson-Mehl-Avrami equation from the dilatometric curves of different heating rates, the activation energy of austenitization is about 9.461×105 Jomol-1, and JMA exponent n and pre-exponential factor lnk0 approximates 0.5884 and 100.73, respectively. Isothermal austenitization kinetic curves were obtained by the determinate JMA equation. The results indicated JMA equation can competently depict isothermal and non-isothermal transformation processes, and isothermal austenitization kinetic curves were also obtained from the non-isothemral dilatometric curves with a constant heating rate by JMA equation. This research presented some theoretical basis and a method to obtain the information of isothermal transformation from the data of non-isothermal transformation testing.