Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy

In the aerospace industry processing of high strength titanium alloys is both resource and time consuming. That why a lot of efforts is put on development of new and highly advanced manufacturing processes as hot die quenching. The process is based on combination of elevated temperature plastic forming with modification of the microstructure due to heat treatment, and thus increase in the properties of finally shaped geometry. One of the most crucial factors in the hot die quenching process is heat transfer coefficient. It is a main driver for adjustment of basic process parameters, as selection of tool material or the strain rate, but also plays an important role while elaborating temperature field in the numerical model. Thus, the main scope of the research within the current study is to examinate the heat transfer coefficient (HTC) for titanium and tooling material, which correspond to a real forming process. New and unique test stand have been designed and presented together with preliminary experimental results, which are a basis for further numerical simulation model of the hot die quenching process.