| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Innovative Process Design and Processing for Advanced Structural Materials
|
| Presentation Title |
On the Micromechanical Response of a Mild Steel during Abrupt Strain Path Changes (SPCs) |
| Author(s) |
Anastasia Vrettou, Hiroto Kitaguchi, Biao Cai, Thomas Connolley, David Collins |
| On-Site Speaker (Planned) |
Anastasia Vrettou |
| Abstract Scope |
The effect of Strain Path Changes (SPCs) on the mechanical properties and crystal-level deformation for a single phase, ferritic steel is studied. SPCs were applied via a two-step deformation process, including pre-straining via cold rolling, then uniaxial tension. The role of texture and micromechanics were examined in-situ, by Synchrotron X-Ray Diffraction, and ex-situ, by Electron Backscatter Diffraction. Strain paths with orthogonal major strains result in lower ductility, becoming more prevalent at high pre-strains. The macroscopic response and texture were dependent on the pre-strain direction but were insensitive to the uniaxial tension direction. Increasing pre-strain magnitudes resulted in stagnation of lattice strain hardening rates in all macroscopic directions and a significant increase in the geometrically necessary dislocation density. This was increased for specimens rolled perpendicular to the initial rolling direction. The initial and developed texture from the pre-strain influences the density of dislocations accumulated in all grains, and ultimately determines ductility. |