A new creep model and its application in the evaluation of creep properties of a titanium alloy at 500 °C

Abstract

Creep is one of the important failure mechanisms of structures operating in high-temperature environments, so accurately assessing the creep properties of materials is essential to structural design and analysis. However, most of the creep researches, there is no uniform method to accurately describe the creep deformation and life. On the basis of previous studies, this paper replaceed the nominal stress in the traditional creep model with the normalized stress of tensile strength and obtains a new constitutive model capable of describing the whole process of creep. It is also applied to the evaluation of creep properties of TC11 titanium alloy at 500 °C. The parameters of different creep constitutive models are obtained by fitting experimental data, including 0-projection model, Batsoulas model, CDM model and proposed model. The advantages and disadvantages of different models are also analysed. In addition, the improvement of the new constitutive model is also discussed.