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A new computer model of as-cast microsegregation was created which can be applied to the majority of carbon, alloy and stainless steels because of its ability to handle multicomponent compositions and the peritectic reaction in a rigorous manner. A comparison of the computed and experimental data shows strong correlation. The program can operate on a 1, 2 or 3 dimensional primary (static) or secondary (coarsening) dendrite arm representative basis, under variable cooling rate or heat extraction control. The finite difference (FD) procedure uses second order interpolation for solute gradients at interfaces, with the interface position independent of nodal planes. A third order interpolation procedure is included for the remeshing of the FD array. The basic concepts and computer model are fairly general to metallic alloys, although the emphasis for application is on steel. Important extensions were also made on analytical equations for microsegregation and the analysis of secondary dendrite arm coarsening. The implications for macrosegregation are discussed, but only semi-quantitative treatments can be added as yet to a detailed treatment of microsegregation.

Additional information

Authors: HOWE A A, British Steel plc, London (GB)
Bibliographic Reference: EUR 13302 EN (1991) 217 pp., FS, ECU 20
Availability: (2)
ISBN: ISBN 92-826-0518-3
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