| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
The Effects of Quenching Medium and Cooling Rates on the Phase Transformation of γ’-Fe4N to Achieve Iron Nitride Martensite |
| Author(s) |
Bin Ma, Guannan Guo, Jian-Ping Wang |
| On-Site Speaker (Planned) |
Guannan Guo |
| Abstract Scope |
The phase transformation of Fe-N alloy during the quenching process from the γ’-Fe4N was investigated under different quenching mediums and cooling rates. The cooling rates were varied by choosing different quenching mediums including water, oil, and the liquid nitrogen with one step or multiple steps quenching. A mixture of iron nitride martensite with BCT structure, γ-FeN phase and residual γ’-Fe4N was obtained after the quenching of γ’-Fe4N. The magnetization continuously increased when the ambient temperature cooled down to 10 K, that the start temperature (250K) and finish temperature (160K) of the martensite transformation can be read from the curve of saturated magnetization vs. temperature. This report proposed a new model to synthesis iron nitride martensite from γ’-Fe4N through the nitrogen atoms diffusion during the quenching with the formation of γ-FeN as the transit phase. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |