An interaction crack growth model for creep-brittle superalloys with high temperature dwell time

摘要

A three-term interaction crack growth model developed for creep-brittle materials is restudied. Derivation of cycle-time interaction intensity factor from the Gaussian equation is discussed. The model's prediction ability was verified by test data of a nickel base super-alloy under 750 °C with 25 s dwell time. Data of two other superalloys namely Alloy 718 and Hastelloy~R X from literature are analyzed to further examine applicability of the model. Satisfactory results are obtained. Parameter fitting procedure and limitation of the model are discussed at the end.