Low cycle fatigue life prediction of GH909 superalloy at elevated temperature

摘要

Low cycle fatigue experiments of low expansion superalloy GH909 at high temperatures of 400°C and 650°C were conducted on servohydraulic test machine by the method of axial strain control. The relationship of strain and life, cyclic strain and stress of the alloy at different temperatures were investigated. The prediction results show that Manson-Coffin model and threeparameter power function give a better life prediction than Ostergren model at different temperatures.