High temperature impact dynamics of titanium alloy manufactured by additive

The research group of Professor Wang Yonggang, Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, in collaboration with Professor Wang Di, School of Mechanical and Automotive Engineering, South China University of Technology, Dr. Li Zhiguo, Associate Researcher, Institute of Fluid Physics, Chinese Academy of Engineering Physics, And Dr. Konrad Kosiba, Institute of Solid State and Materials, Leibniz, Germany. The dynamic response and failure mechanism of Ti-6Al-4V alloy manufactured by laser-selective melting additive under high temperature impact load were studied, and the formation and microstructure evolution of adiabatic shear band under high temperature and high strain rate were revealed. The paper is entitled Dynamic compressive Properties and underlying Failure Mechanisms of Selective Laser-contained Ti-6Al-4V Alloy Under Selective quenching High Temperature and Strain Rate conditions "published in Additive Manufacturing.

At room temperature, ti-6Al-4V alloy with selective laser melting at low strain rate still shows a strong strain hardening effect, but with the increase of strain rate, the plastic deformation zone of the material shows a softening trend, indicating that the latter has gained the upper hand in the competition between strain rate strengthening effect and adiabatic temperature rise effect. When the loading temperature increases, the influence of thermal softening effect is more obvious, and the plastic deformation zone of the material has shown an obvious downward trend. At this time, the fluidity of the material increases due to high temperature, and the corresponding strain also increases. Due to the brittleness of titanium alloy manufactured by additive, the sample tends to completely fracture at low temperature or high strain rate, while the adiabatic shear failure of titanium alloy is easy to occur at high temperature due to its poor thermal conductivity.