Abstract
The overall transformation kinetics and microstructures of an Fe-0.13 pct C-2.99 pct Cr alloy were investigated above and below the bay temperature(T b ) with optical and electron metallography. Most of the kinetic and microstructural aspects of transformation are similar to their counterparts in Fe-C-Mo alloys. Transformation stasis (= incomplete transformation) was observed at all temperatures studied belowT b . However, nonmonotonic behavior of the percent transformation at stasis as a function of undercooling belowT b was found in the present alloy and attributed to a wider temperature interval belowT b in which the Widmanstätten structure is largely suppressed. Also, unlike Fe-C-Mo alloys, fibrous carbides form below as well as aboveT b ; in both Mo and Cr alloys, however, interphase boundary carbides appear in association with proeutectoid ferrite both above and belowT b . The solute drag-like effect, somewhat weaker in Fe-C-Cr than in Fe-C-Mo alloys, provides a qualitative explanation for most of the kinetic and microstructural observations made.
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Formerly Visiting Professor, Department of Metallurgical Engineering and Materials Science, Carnegie Mellon 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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Goldenstein, H., Aaronson, H.I. Overall reaction kinetics and morphology of austenite decomposition between the upper nose and the Ms of a hypoeutectoid Fe-C-Cr alloy. Metall Trans A 21, 1465–1478 (1990). https://doi.org/10.1007/BF02672562
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DOI: https://doi.org/10.1007/BF02672562