Dynamic Tensile Behaviour and Adiabatic Heating of Wrought and Additively Manufactured Ti6Al4V

This work presents a comparison of the dynamic tensile behaviour of additively manufactured and wrought Ti6Al4V. Additively manufactured blocks were produced with different printing and post processing parameters. The tension specimens were wire cut from these blocks and from a hot rolled thin sheet. Tension tests were carried out at room temperature with a universal testing machine and a Tensile Split Hopkinson Bar (TSHB), at strain rates ranging from 1.25×10 −4 to 850 s −1. Adiabatic heating of the specimens was measured with a high speed infrared camera. The mechanical behaviour, strain hardening parameters, and heat release during deformation of the materials were compared. The mechanical behaviour of the investigated materials was similar at both low strain and high strain rates, and all materials showed similar positive strain rate sensitivity in the investigated conditions. The strength of the additively manufactured specimens was in general higher than that of the wrought specimens, whereas the strain hardening rate of all specimens decreased with increasing strain rate. The ductility was similar for all investigated materials and marginally decreased with strain rate. These results show that additively manufactured materials have been developed to a point where their dynamic behaviour is similar to that of wrought materials.