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

MATHEW HENDERY, Mark Whittaker Orcid Logo, Ben Cockings, P.M. Mignanelli

Corrosion Science, Volume: 198, Start page: 110113

Swansea University Authors: MATHEW HENDERY, Mark Whittaker Orcid Logo, Ben Cockings

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Abstract

This paper describes work to study hot corrosion damage in the nickel-based gas turbine alloy RR1000 coated with various salts at 600℃. Interest in type-II hot corrosion on the fatigue resistance of gas turbine alloys has increased to minimise power/thermal inefficiencies. Stress-free corrosion demo...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: Elsevier BV 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa59246
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Abstract: This paper describes work to study hot corrosion damage in the nickel-based gas turbine alloy RR1000 coated with various salts at 600℃. 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.
Keywords: Molten salts; Nickel; Superalloys; Corrosion fatigue; Sulphidation
College: College of Engineering
Funders: The current research was funded by the EPSRC Rolls-Royce Strategic Partnership in Structural Metallic Systems for Gas Turbines (grants EP/H500383/1 and EP/H022309/1) alongside the Materials and Manufacturing Academy (M2A) supported through the European Social Fund. The provision of materials and supporting information from Rolls-Royce plc is gratefully acknowledged. Mechanical testing was performed by MLH and BJC at Swansea Materials Research and Testing Ltd. (SMaRT).
Start Page: 110113