Creep Behavior of a Nickel-Based Superalloy Under Cyclic Temperatures

Abstract

Thermal cycling creep behaviors of Ni-based alloy DZ125 have been studied by means of tests with different stress, overheating duration and temperature. The test results revealed that thermal cycling creep with short overheating duration will offset alloys’ thermal equilibrium state. The decrease on creep resistance of materials suffering thermal cycling creep is analyzed from a microstructure perspective. A phenomenological relationship between overheating number and microstructure evolution has been revealed. Furthermore, an efficient life prediction method specifically for thermal cycling creep was firstly proposed in this research with satisfying accuracy.