About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Correlation Between Microstructure and Fatigue Properties of Complex-phase Steel |
Author(s) |
Nader Heshmati, Peter Hedström, Annika Borgenstam, Henrik Sieurin, Joachim Larsson |
On-Site Speaker (Planned) |
Nader Heshmati |
Abstract Scope |
Complex-Phase (CP) steel with multi-phase microstructures offers an excellent combination of high strength, ductility, and formability. These properties make them an attractive alternative to conventional high-strength low-alloy (HSLA) steel in the automotive industry. However, the relation between microstructure and fatigue properties has not been studied in detail so far. In this work, the effect of microstructure and local hardness on fatigue properties of 8 mm thick commercial CP (800CP) and HSLA (500MC) steels was investigated and compared. The 800CP steel has a 25% higher fatigue limit due to the increased strength of the bainitic-ferritic-martensitic microstructure as compared to the ferritic-pearlitic microstructure in the 500MC steel. Furthermore, microscopy observations indicate more crack branching in the 800CP with blunting of cracks, suggesting that the microstructure more effectively hinders fatigue crack propagation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Iron and Steel |