Abstract
In this study, low cycle fatigue behavior of Zircaloy-4 alloy cladding tube manufactured by cold Pilger rolling and annealing was investigated at room temperature. Results revealed that fatigue cracks initiated toward the marked side on clamped position i.e. on outer wall of the tube. Besides, substantial microstrain and dislocation developed on the out wall surface of the tube during manufacturing stage, which playing a key role in the fatigue crack initiation of the specimens. Meanwhile, effects of grain size and texture of the out wall surface, inner wall surface and cross section remained almost indifferent in this regard.
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