About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Shear Band Block Development in a Quenched and Tempered Steel |
| Author(s) |
Charles N. Adkins, Janith Wanni, Raymond Rasmussen, Curt A. Bronkhorst, Dan J. Thoma |
| On-Site Speaker (Planned) |
Charles N. Adkins |
| Abstract Scope |
Although low-carbon steels are widely used structural materials, the mechanisms involved in their high strain-rate failure are not fully understood. Under such deformation, localized adiabatic shear bands may form, but the short durations and fine scale of microstructural evolution have made them difficult to characterize. A quenched and tempered 0.23%C-1.2 % Mn steel was subjected to interrupted compressive and tensile loading. High-resolution electron backscatter diffraction was used to investigate the strain-induced transformation. With increasing strain in quasi-static loading, an increase in the density of geometrically necessary dislocations was observed, while the overall dislocation density measured with x-ray diffraction remained constant. Under dynamic loading in a forced shear geometry, block elongation and formation of sub-grain dislocation boundaries was observed, ultimately leading to block fragmentation and dynamic recrystallization inside the shear band. These observations provide new insight into rate-dependent microstructural evolution, revealing the dynamic microstructure evolution within an adiabatic shear band. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, |