About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Interstitial Carbon Induced Negative Strain Rate Sensitivity in Q&P Steel |
| Author(s) |
Chengpeng Huang |
| On-Site Speaker (Planned) |
Chengpeng Huang |
| Abstract Scope |
The 3rd-generation advanced high-strength steels (AHSS) with TRIP effect, such as quenching and partitioning (Q&P) steels, possess excellent strength-ductility balance, which are potential structural materials for automobiles. However, their dynamic mechanical behavior under high-speed impact remains unclear. This study investigates the dynamic tensile response and strain rate-dependent deformation mechanisms of a typical Q&P steel. Results show that the Q&P steel exhibits negative strain rate sensitivity (SRS), although the TRIP effects are similar under both quasi-static and dynamic loading conditions. Further investigation shows that the negative SRS is attributed to the suppressed interaction between interstitial carbon atoms and dislocations at high strain rates. Under quasi-static deformation, carbon atoms continuously pin dislocations, promoting dislocation multiplication and providing additional drag force to dislocation motion, both of which disappeared at high strain rate. These findings provide important insights for the safe application of AHSS in automotive structures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Phase Transformations, Characterization |