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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 .
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 the entire structures-of-packet martensite in high carbon steels who fully twinned structure, while the substructures of individual coarse martensite plates in these steels bear bothfully and partially formed 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.