Abstract
At small Fourier diffusion numbers semi-analytical microsegregation models, of the form suggested by Brody and Flemings, are known to perform poorly in the analysis of solidifications controlled by a parabolic solid growth. The basic inconsistency in the development of this class of models is highlighted. It is shown that an alternative, consistent development, for solidifications controlled by a constant cooling rate, results in the same microsegregation model. Comparison with predictions – maximum concentration and eutectic fractions – obtained with a numerical, constant cooling rate solution show a significant improvement in model performance. Further modification – based on curve fitting in the low Fourier number range – leads to a constant cooling rate microsegregation model that provides accurate predictions of microsegregation levels across a wide, practical range of parameters.
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