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研究了TB8钛合金在不同热处理条件下的组织转变规律,并通过剪切实验分析了显微组织差异对于该合金剪切行为的影响。结果表明,热处理条件会影响TB8钛合金的显微组织,也会影响剪切变形行为。随着固溶处理温度升高,合金的晶粒明显变大,析出物的形貌也发生变化,剪切变形变得困难。固溶处理之后的时效温度对合金的剪切变形行为也有显著影响,在840℃固溶处理1 h之后,如果接着进行450℃/8 h时效处理,合金剪切变形所需的驱动力会降低;如果把时效热处理的温度提高到550℃,甚至更高(保温时间不变),那么剪切变形就会发生穿晶断裂。根据剪切检测结果可知,合金经过840℃/1 h固溶处理接着再进行500℃/8 h的时效处理可以获得优异的剪切性能,而且具有合理的显微组织。
The microstructural transformation of TB8 titanium alloy under different heat treatment conditions was studied. The influence of the microstructure difference on the shear behavior of the alloy was analyzed by shear test. The results show that the heat treatment conditions will affect the microstructure of TB8 titanium alloy will also affect shear deformation behavior. With the increase of solution treatment temperature, the grain size of the alloy obviously increases, the morphology of the precipitates also changes, and the shear deformation becomes difficult. The aging temperature after solution treatment also has a significant effect on the shear deformation behavior of the alloy. After the solution treatment at 840 ℃ for 1 h, the driving force required for shear deformation of the alloy will decrease if the aging treatment is performed at 450 ℃ for 8 h ; If the aging heat treatment temperature is raised to 550 ℃, or even higher (holding time unchanged), then shearing deformation transgranular fracture occurs. According to the results of the shearing test, the alloy shows excellent shear properties after being treated by solution treatment at 840 ℃ for 1 h followed by aging at 500 ℃ for 8 h, and has reasonable microstructure.