The Influence Of Processing Parameters Of Thermal Simulation On Microstructure And Properties In Titanium Alloy

Titanium and titanium alloys have been selected by the aerospace industry for high temperature and corrosion resistance.Normal titanium alloys have gradually failed to satisfy the required performance.This research objects in this paper are mainly TA2 pure titanium,TC4 and new Ti-3873 and Ti-3573 titanium alloys.The experiments were carried out by thermal simulation deformation,cold rolling and different cooling methods.The microstructure and deformation properties of these titanium alloys were studied.The main work and conclusions are as follows:In thermal simulated deformation of TA2 pure titanium at three different temperatures and cold rolling deformation of three different thicknesses,it can be found that the deformation resistance of thermal simulation at 400°C is the largest,and as the temperature increases,the stress peak gradually decreases in the recrystallization temperature and below temperature of TA2 pure titanium experiments.TA2 pure titanium was cold rolled to three different thicknesses.The results show that as the degree of cold deformation increases,the hardness increases.When original with a thickness of 15 mm was cold rolled to 11 mm,the hardness of the sample is the smallest.However,the hardness of the sample is the largest when it was cold rolled to 7 mm.Three heating rates were applied to get single β phase after thermal simulation of TC4 titanium alloy.By comparison,it can be found that the hardness of the sample decreases as the heating rate increases.On the basis of Ti-5553 alloy,Ti-3573 and Ti-3873 alloys were developed.After heating to the phase transition point of Ti-3573,Ti-3873 and TC4 titanium alloys,they were cooled in different ways in order to obtain their microstructure.According to the tensile data and fracture morphology,Ti-3573 alloy has higher elongation than Ti-3873 alloy and is more than 1% elongation.But the tensile strength is lower than Ti-3873 under the same condition.By studying microstructure and properties of these β-α type titanium alloys,it can provide a theoretical basis for comparing microstructure and properties of similar titanium alloy.It has certain reference significance for practical production.