Implementation and Utilisation of a Mathematical Model to Simulate Vacuum Arc Remelting of Titanium Alloys

摘要

A numerical model of the vacuum arc remelting (VAR) process called 'SOLAR', which stands for SOLidification during Arc Remelting, has been developed over a number of years at the Nancy School of Mines (LSG2M) and is applicable to the simulation of the melting of titanium. The model is based on the solution of coupled heat, mass and momentum transport equations using a finite volume method. It is able to predict the temperature and composition profiles in the ingot at any time and takes into account electromagnetic stirring, buoyancy flows and turbulence effects. Recent work developed through a new collaborative programme, which includes Timet UK Limited, has resulted in a dramatic reduction in computation time, so that SOLAR is now a more suitable tool for utilisation within industry. This paper provides an overview of the model and some specific validation experiments on pool profiles and chemistry predictions, including a full-scale ingot validation, and an example of application of the model to development of production melting.