论文部分内容阅读
Hot compression tests were conducted on a Gleeble-1500 simulator to investigate the hot deformation behavior ofBT20 Ti alloy (Ti-6AI-2Zr-lMo-lV) in the temperature range from 550 to 1000°C at constant strain rate in therange of 0.01~l s-1, and then the optimum spinning temperature range was determined. Moreover, tube spinningexperiments were executed to verify the reasonability of the optimum temperature range. The results show that theflow stress declines gradually with increasing deformation temperature and decreasing strain rate. In α+β phaseregion the dynamic recrystallization is the main softening mechanism and in β phase region the hot deformationsoftening is controlled by dynamic recovery. In α+β phase region with reducing strain rate dynamic recrystallizationis fully developed. The optimum temperature of hot spinning is 850~900°C and that of warm spinning is 600~650°C.Meanwhile, at the temperature above 600°C tubular workpieces of BT20 Ti alloy have been spun without surfacecracks and microstructure inhomogeneity, which proves that the optimum spinning temperature range obtainedthrough hot compression experiments is reasonable.
Hot compression tests were conducted on a Gleeble-1500 simulator to investigate the hot deformation behavior of BT20 Ti alloy (Ti-6AI-2Zr-lMo-lV) in the temperature range from 550 to 1000 ° C at constant strain rate in therange of 0.01 ~ l, s-1, and then the optimum spinning temperature range was determined. Furthermore, tube spinningexperiments were executed to verify the reasonability of the optimum temperature range. The results show that the flow stress declines gradually with increasing deformation temperature and decreasing strain rate. + β phaseregion the dynamic recrystallization is the main softening mechanism and in β phase region the hot deformations oftening is controlled by dynamic recovery. The optimum temperature of hot spinning is 850-900 ° C and that of warm spinning is 600 ~ 650 ° C.Meanwhile, at the temperature above 600 ° C tubular workpieces of BT20 Ti alloy have been spun without s urfacecracks and microstructure inhomogeneity, which proves that the optimum spinning temperature range obtainedthrough hot compression experiments is reasonable.