Based on corrosion fatigue tests using a boat-shaped specimen in borated and lithiated high-temperature water, the corrosion fatigue behavior of Alloy 690 tubes was investigated. An Institute of Metal Research fatigue model for the nickel-based alloys is proposed, which incorporates fatigue life data of Alloy 690 tubes, as well as round-bar specimen data from the open literature. The proposed environmental fatigue life correction factor Fen addresses the effects of temperature, strain rate, and dissolved oxygen concentration. An evaluation methodology for environmental fatigue damage of structural materials in nuclear power plants is proposed.

Subject
Strain rate, Corrosion fatigue, Water, Materials, Stainless alloys, Gauges, Nickel based alloys, Tubes, Aqueous environments, Experimental data, Corrosion behavior, Corrosion modeling, Fatigue
Keywords:
corrosion fatigue, environmental fatigue design model, high-temperature high-pressure water, nuclear-grade nickel-based alloy
© 2016, NACE International
2016
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