Abstract
The purpose of this study is to investigate the fatigue crack growth behavior of mill annealed Alloy 600 in 0.1M NaCl solution at cathodic potential ({minus}1,300m V{sub SCE}) as a function of load frequency and load ratio (R = P{sub min}/P{sub max}), and to study the possible hydrogen-assisted cracking mechanism during fatigue testing. The hydrogen effects on Alloy 600 occur in air saturated NaCl solution at 25 C with specified load mode which differs from the operating conditions of PWR steam generators. The FCG tests in this study are for the basic research of fatigue behavior of Alloy 600 in aqueous environment. The enhancement of the FCG rates of Alloy 600 in 0.1M NaCl solution at 25 C and {minus}1,300m V{sub SCE} is due to hydrogen embrittlement, and the phenomenon is more significant as load frequency decreases and load ratio increases.
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