Evaluation of high-temperature creep behavior in Inconel-713C nickel-based superalloy considering effects of stress levels

摘要

In this article, high-temperature creep behavior of the Inconel-713C nickel-based superalloy, which has been utilized in turbine blades, has been investigated. Creep testing was carried out on standard specimens at 850 ℃ and under different stress levels. Experimental data demonstrated that the applied stress caused a reduction in the creep lifetime, as a power law. Besides, scanning electron microcopy images showed that the mentioned material had a brittle fracture with cleavage marks on the fracture surface of samples. In addition, optical microscopy images indicated the high effect of the applied stress on the carbides morphology. During higher the creep lifetime, the length of carbides increased parallel to the force direction and caused to produce the trans-granular fracture. Then also, the amount of the γ' phase enhanced in the γ matrix, which caused to strengthen the creep resistance of the material.