MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Isothermal fcc/hcp Transformation in Fe-Si-C-Alloy Thermally Treated at Lower Bainitic Transformation Temperature
Kazuyuki OgawaTakahiro SawaguchiSetuo Kajiwara
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2009 Volume 50 Issue 12 Pages 2778-2784

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Abstract

High resolution transmission electron microscopic observations have revealed that isothermal fcc (γ) to hcp (ε) transformation accompanies the bainitic transformation from γ austenite to bcc (α) bainite in an Fe-2Si-1.4C (mass%) alloy heated at lower bainitic transformation temperature of 570 K. The ε plates are formed at the ledges of α bainite/γ austenite interfaces. The unit volume of the ε phase with respect to that of the γ austenite increases by as much as 16% when the ε plate has grown from 4 nm to 100 nm in thickness, probably due to enhancement of interstitial carbon. There is no visible stacking fault in the ε phases. These experimental results are interpreted by the concept of bainitic transformation both with shear-type and diffusion-type nature.

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© 2009 The Japan Institute of Metals and Materials
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