observed. These martensites are usually very thin and have a smooth straight boundary with austenite. Transformation twins run completely through the martensite plate and no mid-rib is observed. The habit plane of this martensite is nearThis plate-like martensite shows a peculiar nature in morphology which can hardly be observed in the usual lenticular martensite. The thin plate-like martensite can cross each other and make kinking or branching. The martensite plate is considered to be thickened by a combination of many parallel thin plate-like martensites with same variant. Consequently, the thick martensite contains many parallel faint boundaries which are boundaries of the original thin plate-like martensite. Furthermore, it seems that this martensite has the nature capable of gradually growing sidewise.

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