Estimation and Utilization of Structure Anisotropy in Forming Pieces

Abstract

In most of cases, technological processing leads to microstructure anisotropy of material. Results obtained from the analysis of anisotropy can be used for evaluation of material properties and parameters of technology processes. Stereological metallography was used for describing of structure anisotropy. In case of plastically deformed material, degree of orientation of grain boundaries was determined. Grain boundaries are decomposed into isotropic, planar and linear oriented components -specific surface area of grain boundaries and these parameters were measured using oriented test lines stereology method. These results were used for estimation of local plastic deformation using conversion model of orientation grain boundaries to deformation of grains. Our proposed conversion method enables estimation of local plastic deformation in arbitrary place of body with arbitrary state of initial deformation. In case of short fibre reinforced thermoplastics oriented test plane stereology method was used for estimation of experimental orientation of fibres. Degree of orientation was estimated from the number of intersections of fibres with test planes and from these results components of an orientation tensor are estimated. This method is very simple in comparison with a current method which is based on measurement of dimensions and orientation of lot of fibre intersections in analyzed plane.

Estimation of Local Plastic Deformation in a Bulk of Polycrystalline Materials

“…The anisotropic microstructure was decomposed into isotropic and planar oriented components using quantitative metallography (Saltykov stereology methods with oriented test lines) (Martinkovič et al,2016). However, orientation is not the same as deformation, a model of changing the orientation of grain boundaries to deformation was used (Martinkovič, 2017).…”