The effect of a textured surface layer on deformation-induced surface roughening in titanium polycrystals

Abstract

This paper presents numerical investigations of the texture effect on deformation-induced surface roughening in surface-modified titanium specimens subjected to uniaxial tension. Three-dimensional polycrystalline models taking an explicit account of the grain morphology and crystallographic orientations are generated by the method of step-by-step packing. A crystal plasticity-based constitutive model describing the nonlinear behavior of individual grains is implemented in a dynamic boundary-value problem that is solved by the finite-element method. Two sets of calculations for polycrystalline models with textured and non-textured surface layers are performed. The basal texture of the surface layer is shown to effectively suppress surface roughening, both at the grain and mesoscales.