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New observation of martensitic morphology and substructure using transmission electron microscopy

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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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Authors and Affiliations

  1. Department of Mechanical Engineering, Xiangtan University, Xiangtan, Hunan, People’s Republic of China

    Yu Hua Tan (Professor) & Chang De Zeng (Graduate Student)

  2. Institute of Metal Research, Academia Sinica, Shenyang, People’s Republic of China

    Xi Chun Dong (Doctoral Student)

  3. Institute of Iron and Steel, Anshan, Liaoning, People’s Republic of China

    Yue Hui He (Associate Professor)

  4. Central-South Institute of Mining and Metallurgy, Changsha, Hunan, People’s Republic of China

    Shu Qin Hu (Doctoral Student)

Authors
  1. Yu Hua Tan
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  2. Chang De Zeng
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  3. Xi Chun Dong
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  4. Yue Hui He
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  5. Shu Qin Hu
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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

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