About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
|
Presentation Title |
Modeling Non-equilibrium Segregation and Microstructural Evolution during Rapid Solidification in Additive Manufacturing: Application to IN718 Alloy |
Author(s) |
Kang Wang, Bi-Cheng Zhou |
On-Site Speaker (Planned) |
Bi-Cheng Zhou |
Abstract Scope |
During additive manufacturing of metals, the highly complex thermal histories lead to complicated solidification behaviors and will inevitably affect the microstructure of the final products and their performance. One of the most common issue is the micro-segregation, i.e., the diffusion of the alloying elements from the solid back into the melt during solidification process, which will accumulate in the inter-dendritic liquid and form undesired phases in as-solidified products. To model the strongly non-equilibrium micro-segregation and subsequent microstructural evolution, local non-equilibrium solidification theories is coupled with CALPHAD-type thermodynamic and kinetic databases, making it possible to model solidification of commercial alloys with multiple elements (up to 10). The framework is applied to study the micro-segregation, columnar to equiaxed transition, and processing diagram of IN718 alloy during laser-based powder bed fusion, demonstrating its capability in the mitigation of micro-segregation, and tuning the subsequent microstructural evolution during strongly non-equilibrium solidification. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Solidification |