Research on the dynamic mechanical behavior of hot isostatic pressing (HIP) TA15 titanium alloy

Hot isostatic pressing (HIP) can produce titanium alloy components with good performance and has broad application prospects in the field of weaponry and equipment. In recent years, research on the manufacturing process and basic mechanical properties of HIPped titanium alloys has been common, yet there is a lack of studies on the properties and failure behaviors under medium and high strain rates. Using the HIPped TA15 titanium alloy as the research target, a series of dynamic and static experiments were performed. These experiments covered diverse stress conditions, multiple strain rate levels, and Taylor bar impact scenarios. The experimental findings indicate that the HIPped TA15 titanium alloy demonstrates a distinct strain rate strengthening effect and a remarkable thermal softening effect. In order to carry out the Taylor bar simulation, by integrating mechanical property experiments and finite element simulation, the MJC constitutive model, which is capable of precisely depicting the plastic flow behavior of materials, and the DW failure model, which incorporates stress triaxiality and Lode parameters, were adjusted and calibrated. The results of Taylor bar tests and numerical simulations indicate that when the impact velocity ranges from 198.5 to 356.4 m/s, the Taylor bar has different deformation modes such as upsetting and severe rupture. When predicting the Taylor impact-induced deformation and failure of TA15 titanium alloy, coupling the constitutive model put forward by MJC with the failure model formulated by DW can achieve a satisfactory prediction effect.