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The Effect of Step Quenching on the Kinetics of Bainite Formation in Ferrous Alloys

Published online by Cambridge University Press:  21 February 2011

M. Umemoto ,
M. Igarashi  and
I. Tamura
M. Umemoto
Affiliation:
Department of Metal Science and Technology, Kyoto University Sakyo-ku, Kyoto 606, Japan;
M. Igarashi
Affiliation:
Formerly Student of Kyoto Univ. Now at Nippon Seiko (NSK) Co. Ltd., Fujisawa Works, Japan.
I. Tamura
Affiliation:
Department of Metal Science and Technology, Kyoto University Sakyo-ku, Kyoto 606, Japan;
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Abstract

The bainite reactions in the direct and in the step quenched conditions were compared using Fe–7.6Ni–0.48C and Fe–3.6Ni–1.45Cr–0.50C alloys. It was found that in both alloys the bainite reactions were markedly accelerated by step quenching to temperatures even in the stable austenite range prior to the transformation to bainite. Optical microscope observation revealed that this acceleration was caused by the enhanced nucleation of bainite at grain boundaries. This enhanced nucleation by step quench treatment was considered to be due to either the formation of carbon poor areas or the formation of ferrite embryos at the grain boundaries during holding at intermediate temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 823
Copyright
Copyright © Materials Research Society 1984

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References

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