Grain stresses and elastic energy in ferritic steel under uniaxial load

摘要

The main purpose of this work is the study of grain stresses in plastically de-formed textured samples under uniaxial loads where superposition of residual incompatibil-ity stresses and imposed stresses occurs. The methodology for interpretation of diffraction data enabling determination of the grain stresses and elastic energy in polycrystalline materi-als was developed. Using X-ray diffraction, the lattice strains were measured in as received and "in situ" loaded samples produced from a cold rolled ferritic steel. The self-consistent model of elastoplastic deformation was used for analysis of experimental data and the stress tensor was found for each orientation of polycrystalline grains. The stresses and elastic energy in the initial state were successfully determined and presented in Euler space.