Abstract
The influence on the apparent martensitic morphology and substructure of tilting a thin-foil specimen through various angles in the transmission electron microscope was studied in detail. It was found that the amount of laths with internal twins in low-carbon steel after quenching from high temperature is more than 40 pct; the microstructure of medium- and high-carbon steel after quenching from high temperature is completely twinned martensite. Distinguishing twinned martensite by observation of martensitic morphology and substructure using a thin-foil trans-mission electron microscope seems rather unreliable. Previous reports that the volume fraction of lath martensite is about 100 pct in low-carbon steel and 75 to 90 pct in medium-carbon steel quenched from high temperature perhaps need reassessment. The conditions under which in-ternal twins within martensite could be observed in the transmission electron microscope are also discussed.
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Tan, Y.H., De Zeng, C., Dong, X.C. et al. New observation of martensitic morphology and substructure using transmission electron microscopy. Metall Trans A 23, 1413–1421 (1992). https://doi.org/10.1007/BF02647324
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DOI: https://doi.org/10.1007/BF02647324