Abstract
In situ observation of the bainite carbide precipitation processes in 40CrMnSiMoV steel by means of high-temperature transmission electron microscopy (TEM) is conducted. It is evident that carbides can precipitate either in bainitic ferrite or from austenite when carbide-free bainite (meta-bainite) obtained by isothermal transformation is tempered at higher temperatures. In view of the quantity of carbides precipitated from ferrite in combination with the result of an X-ray diffraction analysis of the bainitic ferrite carbon content, it can be concluded that bainitic ferrite growth involves supersaturation of carbon content to some degree.
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Formerly with Northwestern Polytechnical University
Formerly with Northwestern Polytechnical University
This paper is based on a presentation made in the symposium “International Conference on Bainite” presented at the 1988 World Materials Congress in Chicago, IL, on September 26 and 27, 1988, under the auspices of the ASM INTERNATIONAL Phase Transformations Committee and the TMS Ferrous Metallurgy Committee.
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Kang, M.K., Sun, J.L. & Yang, Q.M. High-temperature transmission electron microscopyin situ study of lower bainite carbide precipitation. Metall Trans A 21, 853–858 (1990). https://doi.org/10.1007/BF02656569
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DOI: https://doi.org/10.1007/BF02656569