Micro-Segregation: Issues of Growth Rate and the Peritectic

A.A. Howe

doi:10.4028/www.scientific.net/MSF.649.419

Paper Titles

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Effect of Two-Liquid Casting on the Microstructure of Sn-Pb Alloys
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Micro-Segregation: Issues of Growth Rate and the Peritectic
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Microstructural Response to Growth Rate and Mg Additions during Directional Growth of Al-Cu-Mg Alloys
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Experimental and Simulation Researches about „U” Section Castings Solidification
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On the Problems of a Migrating Hot Spot
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HomeMaterials Science ForumMaterials Science Forum Vol. 649Micro-Segregation: Issues of Growth Rate and the...

Micro-Segregation: Issues of Growth Rate and the Peritectic

Abstract:

Simplified models of micro-segregation are in common use in academia and industry. An issue regarding the accuracy of these approaches is addressed, before describing extensions required for the sponsor (Corus/Tata). It is shown that the adopted growth rate law of the solid is of equal importance as the diffusivity and the partition coefficient. By making the growth rate part of the solution rather than arbitrarily imposed (e.g. parabolic growth), dramatic errors are avoided. This approach has now been extended to the peritectic transformation in steel. Also included are dendrite arm coarsening and predictions of the solute profiles across the solid and their sub-solidus homogenization. The results of this streamlined model compare very well with experimental data and Finite Difference model calculations despite operating orders of magnitude more quickly.

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Periodical:

Materials Science Forum (Volume 649)

Pages:

419-424

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.649.419

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Online since:

May 2010

Authors:

A.A. Howe

Keywords:

Growth Rate, Micro-Segregation, Peritectic, Steel

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