Rolling Process Optimization of Vanadium Microalloyed Automobile Titanium Alloy

Rolling tests of Ti-Al-Mo-Cr-V automobile titanium alloy microalloyed with vanadium were carried out by different processes,and the mechanical properties were tested and compared.The results show that the start-rolling temperature and rolling deformation have obvious effects on the mechanical properties of the tested alloys.The mechanical properties of the tested alloys first increase and then decrease with the increase of starting rolling temperature from 945 ℃ to 1 045 ℃.With the increase of rolling deformation from 59% to 75%,the mechanical properties of the alloys present a sharp increase followed by a slow increase.The optimum start-rolling temperature and rolling deformation of the tested alloy are 1 020 ℃ and 67%,respectively.Compared with those of alloy at the starting rolling temperature of 945 ℃,the tensile strength and yield strength of the tested alloy at 1 020 ℃ respectively increase by 28 MPa and 34 MPa,with the section shrinkage decreased by 2.5%.Compared with those of the alloy at 59% of rolling deformation,the tensile strength and yield strength of the alloy at 67% of deformation increase by 23 MPa and 27 MPa respectively,with the section shrinkage decreased by 1.5%.