Investigating the microstructure variation of commercially pure titanium in hot resistance spinning

In this paper, the effect of current intensity on changes in the microstructure of the hot resistance spinning of commercially pure titanium alloy has been investigated. For this purpose, a set-up for applying resistance heating to the sheet was installed and the configuration of the machine was designed and built in such a way that during the spinning process, resistance heating can be applied simultaneously and titanium sheets can be made into cones. The incomplete part was subjected to the hot resistance spinning process. Then, by conducting experiments in different forming conditions with a change in the intensity of the passing current at a constant thickness and feedrate, different parts were obtained and the microstructure of the material and its granulation, in different forming states and in the part of its various aspects have been studied. The results from this research show that the force applied in spinning in resistance heating at all current intensities has caused the material to become fine. But from a certain current intensity, the material has more time after the completion of recrystallization to remain at higher temperatures, and because of this, there is a greater possibility for the growth of recrystallized grains. Also, the hardness changes in the Vickers scale in the intensity of different currents show that with the increase in the intensity of the current in all parts of the piece, its hardness has increased.