Neutron Diffraction Study of Low-Cycle Fatigue Behavior in an Austenitic–Ferritic Stainless Steel

摘要: By performing in situ neutron diffraction experiments on an austenitic–ferritic stainless steel subjected to low-cycle fatigue loading, the deformation heterogeneity of material at microscopic level has been revealed. Based data collected from a single specimen together with mechanical properties learned ex micro-hardness, correlation found. The performance versus diffraction-profile agrees cyclic-deformation-induced dislocation evolution characterized by TEM observation. Moreover, based refined data, evident strain anisotropy is found austenite. high this phase induced increase density and hence contributes hardening first 10 cycles. Beyond cycles, annihilation rearrangement dislocations both austenitic ferritic phases softens plastically deformed specimen. study suggests that among differently oriented grains micro-strain lattice distortion respective mostly affect behavior different stages stress discrepancy between not dominant mechanism for steel.