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Multiscale modelling of dendrite growth during vacuum arc remelting

Multiscale modelling of dendrite growth during vacuum arc remelting

Yuan, L., Djambazov, G., Pericleous, K. and Lee, P.D. (2007) Multiscale modelling of dendrite growth during vacuum arc remelting. In: LMPC 2007 Proceedings of the 2007 International Symposium on Liquid Metal Processing and Casting. LMPC, pp. 43-48.

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Abstract

Vacuum Arc Remelting (VAR) is the accepted method for producing homogeneous, fine microstructures that are free of inclusions required for rotating grade applications. However, as ingot sizes are increasing INCONEL 718 becomes increasingly susceptible to defects such as freckles, tree rings, and white spots increases for large diameter billets. Therefore, predictive models of these defects are required to allow optimization of process parameters.

In this paper, a multiscale and multi-physics model is presented to predict the development of microstructures in the VAR ingot during solidification. At the microscale, a combined stochastic nucleation approach and finite difference solution of the solute diffusion is applied in the semi-solid zone of the VAR ingot. The micromodel is coupled with a solution of the macroscale heat transfer, fluid flow and electromagnetism in the VAR process through the temperature, pressure and fluid flow fields. The main objective of this study is to achieve a better understanding of the formation of the defects in VAR by quantifying the influence of VAR processing parameters on grain nucleation and dendrite growth. In particular, the effect of different ingot growth velocities on the microstructure formation was investigated. It was found that reducing the velocity produces significantly more coarse grains.

Item Type: Conference Proceedings
Title of Proceedings: LMPC 2007 Proceedings of the 2007 International Symposium on Liquid Metal Processing and Casting
Additional Information: [1] This paper was first presented at the International Symposium on Liquid Metal Processing and Casting (LMPC 2007) held from 2-5 September 2007 in Nancy, France. It was given within the Vacuum Arc Remelting section.
Uncontrolled Keywords: vacuum arc remelting (VAR), INCONEL 718, ingot solidification, stochastic nucleation, finite difference, processing parameters, grain nucleation, dendrite growth
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > TN Mining engineering. Metallurgy
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering Group
School of Computing & Mathematical Sciences > Department of Computer Systems Technology
School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:
Last Modified: 14 Oct 2016 09:03
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/1103

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