| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
|
| Presentation Title |
An ICME-base Investigation of the Homogenization of a Novel VIM/VAR Co-Ni Superalloy |
| Author(s) |
Stephane A.J. Forsik, Alberto O Polar Rosas, Ning Zhou, Gian A Colombo, Tao Wang, Richard H Smith, Akash Patel, Samuel J Kernion, Mario E Epler |
| On-Site Speaker (Planned) |
Stephane A.J. Forsik |
| Abstract Scope |
In premium alloys, microstructure control and cleanliness can be achieved via vacuum induction melting (VIM) and vacuum arc remelting (VAR). During solidification, Co-Ni superalloys develop a dendritic structure and the partitioning of alloying elements results in a microsegregated structure that must be homogenized before further processing. Homogenization parameters have long been determined experimentally and depend on the microsegregation severity, the incipient melting temperature, and the ingot dimensions. The use of modeling tools has considerably accelerated this process by minimizing heat treatment trials.
The microstructure of a novel VIM/VAR Co-Ni superalloy ingot was simulated via computational fluid dynamics and a CALPHAD base approach combining thermodynamic and kinetic models was used to determine homogenization parameters compatible with industrial production. Experimental validation was shown for a 181 kg lab scale VIM/VAR Co-Ni superalloy ingot from which samples were extracted and subjected to various homogenization heat treatments. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |