Prediction of Microstructure of the Fusion Zone of Multicomponent Steel Weld Deposits

H. K. D. H. Bhadeshia, L.-E. Svensson and B. Gretoft

Abstract

A model, based on phase transformation theory, has been developed to allow the prediction of steel weld microstructures. It requires the input of just chemical composition and welding conditions; this facilitates the calculation of the appropriate part of the phase diagram (for steels containing C, Mn, Si, Ni, Mo, Cr, V in any reasonable combination), needed to define the relevant paraequilibrium tie-lines for detailed kinetic analysis. TTT and CCT curves are also computed, together with various transformation start and finish temperatures. These data in turn lead to the estimation of the volume fractions of allotriomorphic ferrite, Widmanstatten ferrite and acicular ferrite. The theory is found to be in good agreement with experimental data.

Advances in Welding Technology and Science,
ASM, Metals Park, Ohio, U. S. A., 1987, pp. pp. 225-229.

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