Internal strains and dislocation microstructures can dramatically affect the mechanical performances of metallic alloys. Then deformation mechanisms and physical properties must be carefully studied to improve the mechanical performance.Austenitic steel samples will be studied under in-situ loading conditions (tension and compression loadings) in order to obtain information about the mechanical processes (Bauschinger reversal tests).To understand how internal strains evolve in several dimensions, it is necessary to obtain extensive data set concerning the behavior of a grains group from a representative volume of the material.This will provide a comprehensive data set to improve a polycrystalline plasticity model by including dislocations interaction effects on hardening between deformation modes and the contribution of the different deformation mechanisms to the macroscopic behavior.