About this Abstract |
Meeting |
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Symposium
|
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Presentation Title |
Prediction of the Columnar-to-Equiaxed Transition During Additive Manufacturing of Concentrated Multicomponent Alloys |
Author(s) |
Christopher A. Hareland, Peter W. Voorhees |
On-Site Speaker (Planned) |
Christopher A. Hareland |
Abstract Scope |
The properties of additively manufactured components are governed by the solidification microstructures that naturally arise during processing. One example is the columnar-to-equiaxed transition (CET), in which columnar grains suddenly give way to an equiaxed microstructure. Existing models of the CET are limited by overly simplistic models of dendritic growth that neglect effects that arise when working with concentrated, multicomponent alloys, such as diffusional interactions between solute species. Here, we derive a general expression for the partition coefficient and perform a marginal stability analysis to determine the tip radius for dendritic solidification of a multicomponent alloy without making the common simplifying assumption of a dilute-ideal solution. By employing CALPHAD free energies of the liquid and solid, this general model of dendritic growth can be used in a CET model to more accurately calculate the processing conditions required to induce the CET during additive manufacturing of modern, technologically relevant alloys. |
Proceedings Inclusion? |
Definite: Other |