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采用分步变形法对TA15合金在10 kN高温电子拉伸试验机上进行了超塑性拉伸试验,研究了变形温度和预变形量对该合金超塑性性能及微观组织演变。结果表明:变形温度为850~950℃和预变形量为100%~200%时,TA15合金呈现出良好的超塑性;变形温度为900℃和预变形量为150%时,该合金的超塑性能最好,最大延伸率为1456%;变形温度为950℃时,该合金的超塑性能降低,延伸率仅为188%。TA15合金的微观组织状态显示:该合金在拉伸变形过程中微观组织保持等轴状,但是随着变形温度的升高,晶粒开始长大,变形温度越高,晶粒长大越显著。
The superplastic tensile test on TA15 alloy was carried out on a 10 kN high temperature electronic tensile testing machine by a stepwise deformation method. The superplasticity and microstructure evolution of the alloy were studied. The results show that when the deformation temperature is 850-950 ℃ and the pre-deformation is 100-200%, the TA15 alloy exhibits good superplasticity. When the deformation temperature is 900 ℃ and the pre-deformation is 150%, the superplasticity The best performance, the maximum elongation of 1456%; deformation temperature of 950 ℃, the superplastic performance of the alloy decreases, the elongation rate was only 188%. The microstructure of TA15 alloy shows that the microstructure of the alloy is equiaxed during the tensile deformation, but as the deformation temperature increases, the grains begin to grow. The higher the deformation temperature, the more remarkable the grain growth.