Abstract
Effect of in-phase and out of phase cyclic loading on fatigue behaviour was evaluated for 304LN stainless steel using tubular specimens. It was found that additional hardening observed for out of phase loading was a consequence of more grains participating in deformation process. Further, strains in matrix were higher and evenly distributed across grains for out of phase loadings as quantified through misorientation analysis. Disparities in misorientation studies were accounted by substructural development investigated through electron microscopy. Additionally, elastic and plastic strains were found to be out of phase with respect to total strains for out of phase loading.
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