The relationship between creep and tensile properties of a nickel-based superalloy

Abstract

Creep is a major failure mode of structures operating in a high-temperature environment, such as aero-engines, gas turbines, steam turbines, and nuclear reactors. To accurately predict and evaluate the creep properties of components, the relationship between tensile strength and creep of materials needs to be systematically considered. In this paper, the high-temperature characteristics of a nickel-based superalloy under different temperatures and stresses are studied. Then the Wilshire equations are used to analyze the minimum creep rate and life of various alloys. Finally, the Monkman-Grant relation and Wilshire equations are modified according to the strain rate and elongation of the tensile test. The results show that there is a close relationship between the creep and tensile strength of materials. The Wilshire equations can be used to describe the creep data in a wide range of lifetime, and the modified Monkman-Grant relation and Wilshire equations can better characterize the creep properties at different temperatures.