A 3D Polycrystalline Plasticity Model for Isotropic Linear Evolution of Intragranular Misorientation with Mesoscopic Plastic Strain in Stretched or Cyclically Deformed Metals

Two-dimensional electron back-scattered diffraction (2D-EBSD) mapping has been widely used for indicating the polycrystalline plasticity through intragranular misorientation parameters KAM and GROD, based on empirically linear relationship between their average values mesoscopic plastic strain, in both stretched cyclically deformed metals. However, whether measured 2D-EBSD observational plane objectively reflects 3D or not is a rarely reported issue. In this research, we firstly compared GROD planes with different angles to loading axis of specimen undeformed clamp sections gauge section, verify increase isotropically strain. Then, proposed six fundamental assumptions developed modified model 2D our previous work. This can explain isotropic evolution low alloy steel uniform equiaxial grains.