EBSD analysis of orientation gradients at grain boundaries

N. DE VINCENTIS; A. ROATTA; M. AVALOS; BOLMARO, R.E.; J.W. SIGNORELLI

Saint George

Conferencia; 18th International Conference on Textures of Materials; 2017

Brigham Young University, Utah.

The goal of this paper is to analyze the orientation gradients developed in grain boundaries of a deep drawing quality steel (AKDQ) with increasing deformation. The analysis was performed using a notched specimen subjected to uniaxial tension interrupted at different strain levels. The microstructure developed in different zones through the notch at each strain condition was characterized at sub-grain level spatial resolution using Electron Backscatter Diffraction (EBSD). This configuration allowed to determine the local evolution of the misorientation gradients developed in each grain boundary of the selected zones. It was observed that the misorientation decreased from the grain boundary to the core of the grain, defining a region of influence of the grain boundary inside each of its neighboring grains. In spite of the strictly-local characteristic of the gradient, it was observed that the severity of these grain boundary regions increased with mesoscopic plastic strain, and that their width did not depend on grain size.