About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics for Sustainability: An EPD Symposium in Honor of Kazuki Morita
|
| Presentation Title |
Thermodynamic Study on TiN Formation in Molten Ni-Fe-Cr-Ti-N Alloys
|
| Author(s) |
Shunsuke Narita, Hiroyuki Matsuura |
| On-Site Speaker (Planned) |
Shunsuke Narita |
| Abstract Scope |
Ni-based superalloys possess excellent heat and corrosion resistance. However, nitrogen tends to form TiN, which can degrade these properties. As a result, scrap materials are often processed through cascade recycling or dynamic refining that sacrifices valuable elements. Nevertheless, horizontal recycling is regarded as a more desirable approach for realizing a sustainable society.
In this study, the formation behavior of TiN was investigated using the equilibrium among molten Ni-Fe-Cr-Ti alloy, nitrogen gas, and nitrides (melt–gas–nitride equilibrium) at 1873 K under atmospheric pressure. The results revealed that as the titanium concentration in the molten alloy increased, the nitrogen solubility decreased.
The experimental data were thermodynamically analyzed using the Wagner interaction parameter framework, focusing on the interaction coefficients between titanium and iron, as well as between titanium and chromium in the Ni-based alloy. Furthermore, the temperature dependence of these interaction coefficients will be presented at the conference. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Extraction and Processing, Sustainability, Copper / Nickel / Cobalt |