| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Understanding and Predicting Dynamic Behavior of Materials
|
| Presentation Title |
Effects of Strain Rate on the Mechanical Properties and Fracture Mechanisms of AHSS Dual Phase Steels |
| Author(s) |
Sukanya Sharma, Shrikant Bhat, Arun Gokhale, Naresh N. Thadhani |
| On-Site Speaker (Planned) |
Naresh N. Thadhani |
| Abstract Scope |
The quasi-static and dynamic mechanical properties under strain rates of 10-6/s-106/s and resulting fracture response of commercial Dual Phase (DP) steels are described in this work. Formability and crash resistance expose these steels used in automotive applications, to high strain rates, and the required properties and performance are often driven by their two-phase microstructure. DP steels with varying volume fractions and connectivity of the martensite phase were mechanically tested at strain rates spanning twelve orders of magnitude (10-6/s to106/s) using servo-hydraulic machines, Hopkinson bar, and plate impact gas gun experiments. The tensile strength of the steels exhibits a positive strain rate sensitivity with increase in strain rate beyond 103/s, and the strain to fracture is a function of the underlying microstructure. Quantitative fractography at different strain rates reveals sensitivity of operative micromechanisms to strain rate, loading conditions, and intrinsic microstructure. |
| Proceedings Inclusion? |
Undecided |