| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials
|
| Presentation Title |
Fatigue Resistance of Low Pressure Nitrided Cr-Mo Low Alloy Steels |
| Author(s) |
Donato Firrao, Enrico Morgano, Graziano Ubertalli, Angelo Brunelli, Davide Sabena |
| On-Site Speaker (Planned) |
Donato Firrao |
| Abstract Scope |
Fatigue resistance of steel parts can be improved by nitriding, the more the deeper is the layer affected by nitrogen diffusion, as stated by the Lessell-Firrao law. Low-pressure nitriding has been applied to wheel's hubs fabricated with a quenched and tempered Cr-Mo low alloy steel. N diffusion depths have been compared to similar results obtained with the same type of automotive parts subjected to classical gas nitriding. 12 h total low-pressure treatment time provided an almost 100% increase of hardened depth over 40 h gas nitrided parts. Both treatments allowed to reach an adequate fatigue life, whereas induction hardened parts did not. X-ray diffraction analysis provided phase constitution of top converted layers in both nitriding cases. A rationale based on the effect of early treatment stage top layer formation has been developed. |
| Proceedings Inclusion? |
Planned: |