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Precipitation of Carbides at γ -α Boundaries in Alloy Steels

A. T. Davenport and R. W. K. Honeycombe
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 322, No. 1549 (Apr. 20, 1971), pp. 191-205
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/77723
Page Count: 21
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Precipitation of Carbides at γ -α  Boundaries in Alloy Steels
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Abstract

Austenite containing 1 to 2 wt% vanadium and 0.2 wt% carbon, held in the range 600 to 850 °C transforms to an extremely fine dispersion of V4C3 in ferrite. The carbide particles are nucleated on the γ -α phase boundary at successive positions during the transformation, forming sheets of precipitate which are 5 to 30 nm apart, while the individual particles are 3 to 10 nm diameter (interphase precipitation). High resolution electron microscopy has provided details of the morphology and crystallography of the carbide particles and the transformation front. A similar reaction has been studied in an iron +6.3wt% tungsten +0.23wt% carbon alloy in which M6C precipitates on a much coarser scale enabling precise observations to be made on the transformation front. Interphase precipitation has also been examined in an iron +3.45 wt% molybdenum +0.22 wt% carbon alloy. A model is proposed for the interphase precipitation which takes into account the observed morphology and crystallography of the carbide phases and of the ferrite.

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