Abstract
Low-cycle fatigue tests have been performed on Zircaloy-2 by a reversed-bending method in inert and iodine atmospheres at 623 K. Fatigue lives in both atmospheres followed the Coffin-Manson law. Cracks propagated by a transgranular shear mode, and the propagation was the process controlling fatigue life in an inert atmosphere. Fatigue life in a high concentration of iodine vapour was significantly shorter than in an inert atmosphere. The iodine vapour caused brittle fracture of a specimen mainly by the transgranular cleavage mode, and an accelerated crack propagation rate. The minimum vapour pressure of iodine to cause brittle fracture under fatigue conditions was about 27 Pa.
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