Mechanical properties and dynamic constitutive model of 42CrMo steel

Publication date: 5 April 2017
Source:Materials & Design, Volume 119
Author(s): Zhiwu Zhu, Yesen Lu, Qijun Xie, Dingyuan Li, Ning Gao
42CrMo steel used in high-speed train axles withstands complex loading conditions. To study the mechanical properties and the stress-strain relationship of 42CrMo steel, it was subjected to quasi-static and dynamic compression experiments. Experiments at eight different strain rates, ranging from 10⁻³ to 4500s⁻¹, demonstrate that it exhibits rate-dependent plastic behavior, thermal softening, and work-hardening behaviors. The dislocation theory explains the deformation mechanism of 42CrMo steel. Furthermore, a new constitutive model, which includes the thermal softening effect, based on the Zerilli–Armstrong constitutive model, is proposed to describe the dynamic mechanical behavior of 42CrMo steel. The model results are in good agreement with the experimental data, demonstrating that the proposed constitutive model describes the mechanical behavior of 42CrMo steel at various strain rates very well.

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