Studies of High-Temperature Fatigue Behavior and Mechanism for Nickel-Based Superalloy Inconel 625

Strain-controlled continuous fatigue and creep–fatigue tests were carried out at 700 °C 800 on Inconel 625 alloy. The effects of strain rate tensile-hold time cyclic stress response life investigated. Then, the microstructural analysis fractographic fatigue-fractured specimens performed by scanning electron microscopy transmission microscopy. responses during high-temperature creep–fatigue–oxidation damage mechanism discussed. results showed that had little effect °C, but there was a significant impact due to interaction. plastic deformation accelerated precipitation ?? phase, resulting in hardening negative sensitivity. failures under conditions occurred with transgranular fracture mode, while transgranular-intergranular hybrid manner found °C. Furthermore, frequency-modified total energy density model proposed consider creep oxidation life, predicted lives located within 1.5 times error band.