Low-Cycle Fatigue Behavior of HAYNES® 282® Alloy and Other Wrought Gamma-Prime Strengthened Alloys

Abstract

Key properties for wrought gamma-prime strengthened alloys used in aero and land-based gas turbine engines include fabricability, creep strength, and resistance to thermal fatigue. Since a definitive test method for measuring thermal fatigue resistance has not yet been accepted in the industry, isothermal low cycle fatigue (LCF) data are often used as a substitute. In this study, the LCF behavior of several gamma-prime strengthened sheet alloys was investigated. The test program emphasized the LCF behavior of HAYNES® 282® alloy, a material designed for excellent creep strength and fabricability (especially weldability). Data was also taken on other gamma-prime strengthened alloys including 263 alloy, R-41 alloy, and Waspaloy alloy for which little to no data existed in literature for sheet material. Fully reversed, strain-controlled LCF testing was performed at temperatures ranging from 1200 to 1600°F (649 to 871°C) on 0.125” (3.2 mm) thick sheet. The results of the testing are presented along with some microstructural characterization. HAYNES and 282 are registered trademarks of Haynes International.