Microscopic Damage Mechanism of Nickel-Based Superalloy Inconel 738LC Under Creep-Fatigue Conditions

摘要

Creep-fatigue damage in Inconel 738LC was clarified by in-situ observation and a new creep-fatigue life prediction model was proposed based on the mechanism identified. Creep-fatigue tests on standard specimens show that the tensile hold creep-fatigue lives Were reduced to 60 to 80 percent and those in the compressive hold condition were Reduced to 20 to 40 percent of the fatigue life of the same total strain condition.