RESEARCH ON THE TECHNICS OF AGING TREATMENT FOR BLADE SPRING

According to the request of blade spring used in space,aging treatment process of ti-15-3 titanium alloy were studied.Through changing the temperature and holding time of aging treatment,three batches of blade springs were aged.The first batch of blade spring was aged at 450 ℃,the second was aged at 520 ℃,the third was aged by duplex aging treatment with the first-step aging at 450 ℃ and the second-step aging at 520 ℃.The results of tensile test show,ti-15-3 titanium alloy aged by first aging treatment obtain higher tensile strength and lower yield strength.Ti-15-3 titanium alloy aged by the second and the third aging treatment obtain higher tensile strength and yield strength.Considering the effect of elongation,the third aging treatment is selected.