Abstract
The pearlite formed in 100Mn13 high carbon high manganese steel after 1323 K water toughening subsequently 923 K aging treatment is studied by transmission electron microscope and high-resolution technique. The results show that the pearlite is composed of three phases, which are M3C lamellae, M7C3 lamellae, and ferrite lamellae, respectively, with the orientation relationships of ()α∥()M7C3, ()α∥()M3C, ()M3C∥()M7C3, []M3C∥[]M7C3∥[]α. And M7C3 is formed at the phase interface between M3C and α. The growth physical model of three-phase pearlite is proposed.
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