The effect of grain size on the localization of plastic deformation in shear bands

The strain localization of plastic deformation in slip bands may induce damage on the specimen surface, characterized by critical values of extrusion height and local irreversible plastic strain accumulated in the band. The functional dependency of the grain size on critical values of these parameters is investigated for nickel-based superalloys. It is confirmed that cracking occurs when certain conditions are fulfilled at the microscopic scale and that the critical value of local irreversible plastic strain accumulated in slip bands is independent of grain size.