Apparent Morphologies and Nature of Packet Martensite in High Carbon Steels

摘要

The apparent morphologies of packet martensitein eight high carbon steels were researched by using op-tical microscope ,scanning electron microscope ,and transmission electron microscope .It was found that the ap-parent morphologies ,substructures ,and habit plane of packet martensite in high carbon steels are entirely differ-ent fromthat in low carbon steels ; the substructures of packet martensite in high carbon steels possess fullytwinned structure , while the substructures of individual coarse martensite plates in these steels bear bothfully andpartially twinned structures . The formation reasonfor apparent morphologies ,substructures and two habit planes(i·e ,{111}rand {225}r) of high carbon martensite were discussed in detail .