Modelling the Carbide Composition Changes in CrMoV Steel
X. Du, R. C. Thomson, J. A. Whiteman and H. K. D. H. Bhadeshia
University of Cambridge


Abstract

The composition of pearlitic cementite in a 1/2Cr1/2Mo1/4V steel has been extensively studied for long tempering times at a number of different temperatures. The chromium content of the cementite is found to increase steadily with time as the microstructure is tempered, at the expense of the iron content. Transformation of the cementite to alloy carbides occurs at long tempering times. The composition changes in the cementite have been modelled theoretically using numerical methods. There is excellent agreement between the predictions of the model and the experimental results. The dependence of composition on particle size has been studied and has been shown not to be significant because of the relatively large size and low chromium concentration of the pearlitic cementite. It is therefore possible to estimate an effective service temperature of components of 1/2Cr1/2Mo1/4V steel in power plant for use in prediction of their remanent life.

Materials Science and Engineering A, Vol. A156, 1992, 1-9.

Some of the computer programs associated with this paper can be obtained from the Materials Algorithms Project





JNL

Science and Technology of Welding and Joining

A journal founded and edited by
S. A. David, T. Debroy and H.K.D.H. Bhadeshia
Published by The Institute of Materials, London, since 1996

MMWP1

Mathematical Modelling of Weld Phenomena

Eds. H. Cerjak and K. E. Eastering
Institute of Materials, London, 1993

MMWP2

Mathematical Modelling of Weld Phenomena 2

Edited by H. Cerjak
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MMWP3

Mathematical Modelling of Weld Phenomena 3

Edited by H. Cerjack
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Institute of Materials, London, 1997

mmpw4

Mathematical Modelling of Weld Phenomena 4

Edited by H. Cerjack
Series Editor H.K.D.H. Bhadeshia
Institute of Materials, London, 1998