Advances in the solidification of IN718 and RS5 alloys

Abstract

One of the main objectives of this work is to analyze and compare the solidification characteristics of IN718 and RS5 alloys. In this regard, a methodological approach for estimation of the solidification parameters of multicomponent alloy systems was developed. The methodology is based on a deterministic solidification-kinetics approach for multicomponent and pseudo-binary alloy systems. Comparisons between IN718 and RS5 alloys in terms of solidification morphologies are provided. Calculated and experimental results for as-cast microstructures obtained with the Thermally Controlled Solidification process that was developed by PCC Inc. is presented. The withdrawal rate effects on the solidification microstructures of IN718 and RS5 are discussed in detail. Differential thermal analysis (DTA) analysis and metallurgical characterization were also performed to determine the solidification and post-solidification phases and to estimate the secondary dendrite arm spacing in RS5 alloy. Solidification maps were predicted for IN718 and RS5 alloy.