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Fastening brackets for ceramic heat shields of gas turbine engine combustion chambers were found to be grossly overheated after only 1 100 operating hours. They were made from the wrought nickel-base superalloy Nimonic alloy 90. The affected parts were disassembled from the engine and replaced. One bracket was selected for an exemplary metallographic examination at the laboratory of the gas turbine engine manufacturer. The bracket exhibited severe deformation, oxidation, and creep damage. The alloy was selected properly for this application. The cause of the thermal overload is unknown to the investigating laboratory. It was recommended to find and remove the reason for the excess thermal exposure.

Metallurgical Failure Investigation of Overheated Brackets Made of Nimonic Alloy 90