Abstract
Alloy 800H is one of the candidate materials for key structural components such as control rod systems, hot gas duct, core barrels, core supports and shut-down cooling systems for the very high temperature reactor (VHTR) system. The aim of this paper is to compare the low-cycle fatigue behaviors of the alloy 800H base metal and weldments at a high temperature of 850℃. Low cycle fatigue tests were carried out for four different total strain ranges of 0.6, 0.9, 1.2 and 1.5% under constant strain rate of 10-3/s. In all test conditions, the fatigue life of base metal and weldments decreased inversely proportional to the total strain range. The cyclic stress response behavior showed cyclic softening phenomenon for both materials. The low cycle fatigue life for base metal and weldments were predicted by the Coffin-Manson-Basquin law. The results showed that transition life of the weldments is shorter than that of the base metal.
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