Multiscale modelling approach for predicting solidification structure evolution in vacuum arc remelted superalloy ingots

Abstract

The present paper describes the mathematical development and validation of a comprehensive stochastic model capable of predicting at the mesoscopic level the solidification structure, Laves, and NbC phases in superalloy ingots processed by vacuum arc remelting (VAR) technology. The multiscale modelling approach consists of a coupling between a fully transient deterministic macroscopic code and a stochastic mesoscopic solidification structure code. Predictions from the model were validated against experimental measurements. Multiscale model predictions are compared against a commercial size VAR ingot.

Keywords:

• Multiscale modelling
• Stochastic mesoscopic modelling
• Vacuum arc remelting
• Ingot solidification structure
• Alloy 718
• Laves and NbC phases

The author would like to acknowledge the Carpenter Technology Corporation for sponsoring the present research programme and Dr A. Patel for his useful comments in writing the present article.