About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Characterization of Minerals, Metals and Materials 2022
|
Presentation Title |
Exploring Three Dimensional Orientation and Residual Stresses in Railway Steels |
Author(s) |
Can Yildirim, Yubin Zhang, Erika Steyn, Fang Liu, Carsten Detlefs, Casey Jessop, Johan Alstrom |
On-Site Speaker (Planned) |
Can Yildirim |
Abstract Scope |
Railway wheel steels, typically comprising a fine lamellar pearlitic microstructure, undergo a combination of thermal and mechanical loads in service that may lead to material failure due to increased residual stress levels. Here, we use an advanced synchrotron technique, dark field X-ray microscopy, to map 3D lattice variations including both the crystallographic orientation and lattice strain, within individual pro-eutectoid ferrite grains. In addition to an as-manufactured sample, we studied samples that underwent low cycle fatigue tests followed by isothermal heat treatments at 300– 600°C. The as-manufactured sample shows an orientation variation up to 0.5° and compressive elastic strain up to 1.8 × 10−3, but no direct correlation between the measured compressive strain and lattice orientation. The LCF tested samples exhibit an increase in orientation spread up to 3-4°, while the grain-level residual stresses show a non-monotonous trend as a function of annealing temperature. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Characterization, Other |