Grain stresses and critical resolved shear stresses in duplex steel studied using neutron diffraction and crystallite group method - research data

In this work a new method for analysis of neutron diffraction results obtained during “in situ” tensile load is applied and tested. The methodology is based on the measurements of lattice strains during “in situ” tensile test for several hkl reflections and for different orientations of the sample with respect to the scattering vector. As the result the full stress tensor for preferred texture orientations in function of applied stress can be determined with help of crystallite group method (CGM). Knowing the experimental values of stresses the localisation tensor is determined. The experimental data are compared with self-consistent model calculations performed for groups of grains corresponding to the measured hkl reflections. The invaluable advance of the developed experimental methodology is possibility of estimation of critical resolved shear stresses (CRSS) directly from measurement, without use of elastic-plastic models.