Enhanced dynamic mechanical properties and resistance to the formation of adiabatic shear band by Cu-rich nano-precipitates in high-strength steels

Cu-rich nano-precipitate strengthened steel is a kind of promising impact-resistant structural materials due to its perfect combination of strength and ductility. In this study, the effects of the Cu-rich nano-precipitates on the dynamic mechanical properties, deformation resistance and adiabatic shear band formation were systematically investigated. It is found that the Cu-rich nano-precipitates can effectively improve the strength at high strain rate during dynamic deformation. The maximum flow stress reaches similar to 2565 MPa at the strain rate of 6000 s(-1), presenting the outstanding dynamic mechanical properties. The nano-precipitate-strengthened steel has a great positive strain rate sensitivity at a high strain rate, showing the excellent resistance to high-speed deformation and delayed fracture. The nano-precipitates can effectively hinder the formation and development of the adiabatic shear bands and improve significantly the maximum flow stress and microstructure stability during the high-speed impact.

Automated summary

Cu-rich nano-precipitate strengthened steel exhibits excellent dynamic mechanical properties and deformation resistance, showing outstanding impact resistance and delayed fracture performance at high strain rates, while effectively hindering the formation of adiabatic shear bands.