One of the most critical issues in railway engineering is the rail lifetime optimization. In track, rails suffer from various degradation forms like the head checks, squats and studs. The white etching layer (WEL) is considered as a primary stage of damage. The WEL usually appears as a metallurgical change due to the severe loading in the rail running band. This work addresses their generation based on the wheel-rail contact together with a metallurgical analysis. Influences of microstructure and stress on the austenite transformation kinetic are simulated. Consequently, the isothermal austenization diagrams for R260Mn, R350HT and R370CrHT grades under stress are discussed. It turns out that the austenitic transformation is possible within a comparable time to the wheel-rail contact duration.
|Title of host publication||Proceedings of the 11th International Conference on Contact Mechanics and Wear of Rail/wheel Systems, CM 2018|
|Editors||Alfredo Nunez, Zili Li|
|Number of pages||11|
|Publication status||Published - 2018|
|Event||11th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2018 - Delft, Netherlands|
Duration: 24 Sep 2018 → 27 Sep 2018
|Conference||11th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2018|
|Period||24/09/18 → 27/09/18|
- Heat treated grades
- Isothermal transformation
- Shifting time transformation under stress.
- Wheel-rail contact
- White etching layer (WEL)