Crystallographic orientation and spatially resolved damage for polycrystalline deformation of a high manganese steel

Deformation damage during tension and compression were revealed using in-situ neutron diffraction for a high manganese steel: (1) When the tensile stress is increased, an indication of provided when 111 422 lattice strains along transverse direction give no more contraction or even expansion. This because that replacement slip twinning activities by crack propagation induces relaxation, which can outweigh damaged planes. (2) For also amplitude decreased, increase 111, 220, 311, strain amplitudes loading indicates damage. micro-cracks decrease effective elastic modulus not favored compression. The identified grains both cases belong to same set. Distribution in fractured samples similar from featuring large Taylor factors. cracks mainly distributed at surface. It due stronger deformation heterogeneity ratcheting events surface rather than interior. During tension-compression fatigue loading, grain boundaries narrow twins often correspond different transversal expansion those other areas. may trigger flaws as nuclei cracks. findings point important relations among damage, strains, plastic activities, well behavior differences between