HIGHTEMPERATURE LOWCYCLE FATIGUE BEHAVIOR OF NICKELBASED SUPERALLOY GH4049
HIGH-TEMPERATURE LOW-CYCLE FATIGUE BEHAVIOR OF NICKEL-BASED SUPERALLOY GH4049

The cyclic stress response and lowcycle fatigue life for wrought nickelbased superalloy GH4049 were investigated in the temperature range from 500 to 800 The relationship between the strain amplitude and the number of stress reversals was given. The behavior of cyclic hardening was observed for higher strain amplitudes at all testing temperatures and the lowcycle fatigue life generally decreased with increasing testing temperature for the same strain range. In addition, fracture surfaces of the fatigued samples were examined by using a scanning electron microscope.