Abstract
Themicrostructures of 20, 30, 40, 45, T9, T10, T11, 20Cr, 40Cr, 45CrNi, 65Mn, 9CrSi, CrWMn commercial carbon and alloy steels were observed by optical microscopy, scanning electron microscopy and transmission election microscopy, meanwhile the habit plane, the substructure and stereo shapeof martensit have been proposed. It was verified that the packet martensite should be divided into packet thin sheet martensite and packet fine martensite, the latter principally can be divided into {557}A packet fine plate martensite, {1 1 1}A packet fine plate martensite and {2 2 5}A packet fine plate martensite according to the carbon content. Space morphology of low carbon packet martensite units is sheet-like but not lath-like; that of martensite medium and high carbon packet martensite units is plate-like. There is no noticeable difference between the substructures of lath and plate martensite. Martensite without internal twin is not certainly lath martensite, while all martensite with numerous internal twins is certainly plate martensite.
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