图2. Fe-1.29C-13.9Mn钢在650 ℃保温72 h后珠光体团簇横截面的SEM像

Fig.2. Cross section SEM images of large pearlite group nodules in Fe-1.29C-13.9Mn steel after heat treatment at 650 ℃ for 72 h (The growth orientations of the pearlite in colonies I~V in Figs.2c and e are different)(a) pearlite group nodules nucleated on the Widmannstätten cementite plates(b) pearlite group nodules nucleated on the grain-boundary cementite(c) pearlite group nodules nucleated on the cementite plate (deep-etched)(d) 56° tilt of Fig.2c(e) pearlite group nodules nucleated on grain boundary (deep-etched)(f) 45° tilt of Fig.2e