Cyclic-loading induced lattice-strain asymmetry in loading and transverse directions
作者： E-Wen Huang , Rozaliya I. Barabash , Bjørn Clausen , Peter K. Liaw
DOI: 10.1007/S11661-011-0972-9
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摘要: Cyclic-loading effects on a nickel-based superalloy are investigated with in-situ neutron-diffraction measurements. The temperature evolution subjected to cyclic loading is estimated based the lattice-strain evolution. calculated thermoelastic responses compared measured bulk Two transitions in temperature-evolution observed. first transition, observed neutron-measurement results, associated hardening/softening-structural transformation. second transition at larger number of fatigue cycles. It has distinct origin and related start irreversible structural transformations during fatigue. A asymmetry behavior quantified as grain-orientation-dependent transverse/loading parameter. This strain-asymmetry reveals plastic deformation phenomena might relate formation microcracks. At elevated temperatures, hardening/softening starts lower cycles room temperature. comparison between room-temperature elevated-temperature experiments performed. asymmetry-parameter evolutions show same trends both temperatures.
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