High Cycle Fatigue Properties of Haynes 230 (registered trademark) Before and After Exposure to Elevated Temperatures (Preprint)

The objective of this work was to investigate the high cycle fatigue properties of a nickel based superalloy, Haynes 230, targeted for use in thermal protection system (TPS) applications. This study includes room temperature testing in longitudinal and transverse directions before and after exposure...

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Bibliographic Details
Main Authors: Morrissey, R J, John, R
Format: Report
Language:English
Subjects:
ELEVATED TEMPERATURE
EXPOSURE(GENERAL)
FATIGUE(MECHANICS)
GAGES
HIGH CYCLE FATIGUE
Metallurgy and Metallography
NICKEL ALLOYS
NICKEL SUPERALLOY
PE62102F
ROOM TEMPERATURE
STINFO(SCIENTIFIC AND TECHNICAL INFORMATION)
STRENGTH(MECHANICS)
SUPERALLOYS
TEST AND EVALUATION
THIN GAGE
WUAFRL43472025100102
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Summary:The objective of this work was to investigate the high cycle fatigue properties of a nickel based superalloy, Haynes 230, targeted for use in thermal protection system (TPS) applications. This study includes room temperature testing in longitudinal and transverse directions before and after exposure to elevated temperatures out to 107 cycles using a unique test system specifically developed for thin gage applications. Specimens with thicknesses of 0.127 mm were tested following exposure to a temperature of 982 C for 100 hours. The tensile properties exhibited by the as-received material were found to be independent of orientation, with extremely consistent results between the longitudinal and transverse specimens. In contrast, specimens exposed to elevated temperature showed a significant drop in yield stress, ultimate strength, and ductility. Similarly, fatigue properties of longitudinal and transverse as-received material vary only slightly, while exposure to elevated temperature causes a significant decrease in the fatigue strength of the material.