ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
The γ→α Transformation in Low Carbon Irons
E. A. Wilson
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JOURNAL FREE ACCESS

1994 Volume 34 Issue 8 Pages 615-630

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Abstract

The influence of cooling rate on transformation temperatures in low carbon irons is reviewed. Plateaux are obtained in plots of transformation temperature vs.cooling rate. Comparison with later published TTT diagrams show that these plateaux correspond with the nose of 'c' curves on TTT diagrams. This leads to a proposed TTT diagram for iron. Transformations in Fe-Ni, Fe-Cr and Fe-C alloys, and low carbon irons are reviewed. The morphology and kinetics of the individual transformations, namely equi-axed ferrite, massive ferrite, bainitic ferrite, lath (massive) martensite and twinned martensite are then discussed. A recent theoretical treatment of the equi-axed ferrite transformation is summarised. This theory indicates that the kinetics of the equi-axed ferrite transformation is controlled by growth. Correlation is made between microstructures obtained in binary alloys and those obtained in Fe-Nb-C alloys and commercial HSLA steels.

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© The Iron and Steel Institute of Japan
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