About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Fracture of Steels: New Approaches to Modeling and Experimental Characterization
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| Presentation Title |
Influence of Temperature and Strain Rate on Damage Evolution in Ti/Nb HSLA Steels |
| Author(s) |
Zahra Hashemitabar, Nafiseh Mohammadtabar, Rylee Davison, Tihe Tom Zhou, Chad Cathcart, Alexander Bardelcik |
| On-Site Speaker (Planned) |
Rylee Davison |
| Abstract Scope |
Four Ti/Nb precipitation-strengthened HSLA steels were examined to evaluate tensile behavior, ductility, and damage evolution. The steels exhibited refined ferritic microstructures (1.5–2.6 µm) and quasi-static room-temperature tensile strengths ranging from 597 to 781 MPa. Tensile testing was performed at strain rates up to 1 s⁻¹ and at −80 °C using a newly developed low-temperature methodology. While strain-rate sensitivity was moderate, low-temperature testing significantly increased tensile strength to 756–938 MPa. Ductility, assessed through area reduction, showed notable temperature and strain-rate dependence only in the highest-strength grade. Fractography revealed distinct damage evolution mechanisms among the steels, with elevated strain rates and low temperatures increasing damage accumulation in some grades. Large TiN particles contributed to the observed damage accumulation. Phase transformation simulations indicated that carbide and carbonitride precipitation strengthening played a significant role in the superior properties of the highest-strength steels. |