| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Nitride Precipitation Induced by Nitrogen-solute Clustering in Ferrous Alloys |
| Author(s) |
Goro Miyamoto, Meng Zhu, Yasuhiro Tateyama, Tadashi Furuhara |
| On-Site Speaker (Planned) |
Goro Miyamoto |
| Abstract Scope |
Nitriding treatment is commonly used for surface hardening of machinery parts for improvement of fatigue strength and wear resistivity. In the nitriding of ferrous alloys containing strong nitride forming element (M), surface hardening occurs by precipitation of fine nitrides. The present authors directly observed that surface hardening in the nitriding of Ti or V-added specimens occurs not by the precipitation of stable alloy nitrides but by meta-stable mono-layer M-nitrogen(N) clusters by means of high resolution transmission electron microscopy. On the other hand, clustering was not observed in Al or Cr-added specimens. Furthermore, in nitriding of ternary alloys containing cluster-forming and non-forming elements, such as Fe-Al-(V, Ti) alloys, V-N or Ti-N clustering induces nucleation of fine AlN particles, which results in significant surface hardening. This indicates pre-cursor solute clustering can be used to control precipitation reaction in ferrous alloys. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |