|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Microstructural Evolution of TWIP Steels during ECAP
||Jessica Calvo, Wang Lei, José Antonio Benito, José María Cabera
|On-Site Speaker (Planned)
TWIP (TWinning Induced Plasticity) steels have received a lot of attention from the car making industry due to their exceptional energy absorption capability. These steels, which deform by a combination of dislocation slip and mechanical twinning, exhibit ultimate tensile strengths above 1000MPa with ductility values higher than 50% and strain hardening coefficients around 0.8, but their yield strength is moderate. In order to increase the yield strength several alternatives can be explored, being severe plastic deformation processes a promising route, due to the grain refinement associated to these techniques. In particular, Equal Channel Angular Processing (ECAP) was applied to two different TWIP steels. The process was performed at 300°C and the samples were subjected to up to four deformation passes. The evolution of the microstructure after one, two and four ECAP passes was evaluated by means of Electron Back Scattered Diffraction (EBSD) and Transmission Electron Microscopy (TEM).
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