Characterization Method for Hardening and Strain-rate Sensitivity at Elevated Temperature Based on Uniaxial Tension and Creep Tests

Abstract

The characterization of hardening behavior with deterioration and strain-rate sensitivity of metals at elevated temperatures is challenging since it poses ambiguity, if only the simple tension test is utilized, in decoupling the effects of hardening deterioration and strain-rate sensitivity in the post-uniform deformation range. Therefore, an inverse characterization method involving not only the simple tension test but also the creep test was newly developed in this work and the method was applied for an Mg alloy sheet at elevated temperatures for demonstration purposes. Besides, in order to investigate the effect of material and process parameters on the creep strain behaviors, the analytical solutions, assuming the homogeneous deformation under the constant force and stress conditions, were derived and their parametric study was also conducted.