New method to establish constitutive relationship considering effect of deformation heating

During the isothermal constant strain rate compression process, the effect of deformation heating on flow stress increases with increasing equivalent strain rate. When the equivalent strain rate is relatively low, this influence can be neglected and the compression process can be considered as an isothermal process. While the equivalent strain rate is high, this influence is of importance and the compression process can be approximately considered as an adiabatic process. In this paper a method is proposed for taking the effect of deformation heating into consideration and the constitutive relationship for GH4169 alloy was formulated by using the method based on the results of isothermal constant strain rate compression test. The proposed constitutive relationship is capable of revealing the dynamical characteristics of materials during hot deformation processes, creating an essential prerequisite for improvement of numerical simulation accuracy of metal forming processes. [