自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 3    No. 2    December 1996

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INVESTIGATION ON THE MORPHOLOGY OF MARTENSITE IN CARBON STEELS
He Yuehui1; Rao Qiuhua2; Tan Yuhua3

1. Powder Metallurgy Research Institute, Central South University of Technology,Changsha 410083, China;
2. Department of Architectural Engineering, Central South University of Technology;
3. Department of Mechanical Engineering, Xiangtan University, Xiangtan

Abstract:The effect of carbon content on the morphology of martensite in carbon steels has been studied in depth. It is found that not all the packet martensites obtained in carbon steels quenched from elevated temperature are lath martensite. The packet martensite obtained thus should be divided into two categories: packet thin plate martensite (i.e. lath martensite) and packet plate martensite. The former is only found in low carbon steels, the latter mainly in medium and high carbon steels. The morphology of martensite in steels with different carbon contents has been researched in detail using optical microscopy, SEM and TEM. A new criterion is proposed for identifying the category of martensite. Based on this new criterion, it is found that as-quenched steels withCc≤0.2% contains lath martensite; that with 0.2%<Cc<0.4% contains a mixture of lath and plate martensite. The structure of as-quenched steels withCc≥0.4% is completely of plate martensite. The curve of the relative volume percentage of martensite without internal twins versus carbon content has been redetermined. Finally, the misinterpretation of experimental results by previous investigators is analysed.

 

Key words: martensite; morphology; carbon content

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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