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A numerical procedure for the simulation of solidification and micro-segregation is presented. The iterative solution algorithm is based on the classical Scheil – Gulliver model; however, the new algorithm allows taking into account partial redistribution of fast diffusing elements and solid – solid phase transformations, such as the peritectic reaction in low-carbon steels. It is shown that, especially in interstitial/substitutional alloys such as steels, simulations performed with the new algorithm give considerably different predictions as compared to simulations carried out with the classical Scheil – Gulliver procedure. The new procedure is described in detail and the results are validated on experimental data, i. e. micro-segregation measurements, the determination of the brittle temperature range for hot-cracking and experimental data on the specific heat capacity during solidification.

Scheil–Gulliver simulation with partial redistribution of fast diffusers and simultaneous solid–solid phase transformations