About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Simultaneous Improvement of Fatigue Limit and Tensile Strength by Caliber Rolling in Pearlitic Steel |
| Author(s) |
Kazuho Okada, Rintaro Ueji, Akinobu Shibata |
| On-Site Speaker (Planned) |
Kazuho Okada |
| Abstract Scope |
Achieving both high-strength and high-fatigue limit (σB) is crucial for the social implementation of structural materials; however, this becomes challenging when the tensile strength exceeds ~1.4 GPa in steels. This study successfully overcame this ceiling in pearlitic steel (Fe-0.53C-1.48Si-0.70Mn-0.76Cr (wt.%), equivalent to SAE9254) through caliber rolling (rolling reduction: 88%); the maximum stress corresponding to σB increased from 625 to 1300 MPa (stress ratio: 0.1), accompanied by an increase in tensile strength from 975 to 1500 MPa at room temperature. Before rolling, cracks preferentially initiated along the cementite/ferrite lamellar structure, and the σB corresponded with crack non-propagation limit. After rolling, the above crack initiation mechanism was completely suppressed, and the σB corresponded with crack initiation limit. The mechanism of superior fatigue resistance in the rolled steel is discussed by correlating the crack initiation/propagation path and the elongated lamellar structure with a high density of fiber texture (rolling direction parallel to <110>α). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Other |