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 in type-II hot corrosion on the fatigue resistance of gas turbine alloys has increased to minimise power/thermal inefficiencies. Stress-free corrosion de...

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Bibliographic Details
Published in:Corrosion science 2022-04, Vol.198, p.110113, Article 110113
Main Authors: Hendery, M.L., Whittaker, M.T., Cockings, B.J., Mignanelli, P.M.
Format: Article
Language:English
Subjects:
Chlorine
Composition effects
Corrosion
Corrosion effects
Corrosion fatigue
Corrosion resistance
Corrosion tests
Crack initiation
Fatigue life
Fatigue strength
Fatigue tests
Gas turbines
Hot corrosion
Molten salts
Nickel
Nickel base alloys
Stresses
Sulphidation
Superalloys
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Summary: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 in type-II hot corrosion on the fatigue resistance of gas turbine alloys has increased to minimise power/thermal inefficiencies. Stress-free corrosion demonstrated a greater impact of sulphate (versus chloride) on maximum pit depth, a key influencing factor of fatigue lives. In corrosion-fatigue testing, at low stresses sulphate was shown to be more influential of fatigue life. At high stresses, the presence of greater crack initiation sites, reduced initiation lives and cracked oxide suggests chlorine influenced the crack-initiation behaviour. •The first instance of the effect of salt composition on the type II hot corrosion of a nickel-based superalloy at 600 °C.•Provides a new insight into the effects of chloride and sulphate-based species on stress-free corrosion and corrosion-fatigue.•An interesting change in dominating mechanism was observed above and below a ‘threshold’ stress.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2022.110113