The effect of salt composition on the stress-free and corrosion-fatigue performance of a fine-grained nickel-based superalloy

This paper describes work to study hot corrosion damage in the nickel-based gas turbine alloy RR1000 coated with various salts at 600 °C. Interest type-II on fatigue resistance of alloys has increased minimise power/thermal inefficiencies. Stress-free demonstrated a greater impact sulphate (versus chloride) maximum pit depth, key influencing factor lives. In corrosion-fatigue testing, low stresses was shown be more influential life. At high stresses, presence crack initiation sites, reduced lives and cracked oxide suggests chlorine influenced crack-initiation behaviour.