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TEM Microscopical Examination of the Stepped Bainite Reaction in Silicon Steels.

Published online by Cambridge University Press:  02 July 2020

G. Fourlaris  and
G. Papadimitriou
G. Fourlaris
Affiliation:
School of Materials, The University of Leeds, LeedsLS2 9JT, U.K.
G. Papadimitriou
Affiliation:
National Technical University of Athens, Laboratory of Physical Metallurgy, 15780Athens, GR.
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Extract

The bainitic reaction in steels has been extensively studied, however it is still controversial whether it proceeds by a diffusional or a shear mechanism. In a previous investigation of the bainite reaction in a Fe-3.9Si-0.9C steel the transformation was considered to be the result of two competing elementary mechanisms, i.e., the shear transformation of the α-iron lattice and the diffusion of interstitial carbon away from the transformation interface.

In this paper, the microstructural and crystallographic characteristics of the bainite products obtained through the step quenching experiments are examined, using TEM and Electron diffraction. The results are compared to those obtained by the corresponding bainitic transformation in a single step. The results obtained here support the proposed model in and the shear character of the bainitic transformation.

The same steel as in, an alloy with 3.9 w.t.% silicon and 0.9 w.t.% carbon, was used. After austenitizing at 1130°C for 30 minutes a number of samples were transformed at 420°C for 30 minutes and subsequently quenched in a second bath where they were kept for times increasing from one to thirty days at temperatures of either 360,340 or 290°C.

Type
Phase Transformations in Metals and Alloys
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 689 - 690
Copyright
Copyright © Microscopy Society of America 1997

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