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设计了一种新的循环热处理工艺，并用正交设计试验（Ｌ１６（４５））研究了各热处理工艺参数，即加热速度、保温温度、保温时间、冷却速度和循环次数对铸造ＴｉＡｌ基合金显微组织和显微硬度（ＨＶ５）的影响．结果表明：循环热处理工艺均能不同程度地提高显微硬度，提高的最大幅度达４０％；各因素的影响按大小排列依次为加热速度，保温时间、保温温度、冷却速度、循环次数．利用循环热处理可获得不同类型的显微组织．在正交试验的基础上确定了优化的热处理工艺，并用它获得了细小的显微组织．
A new cycle heat treatment process was designed. The effects of heat treatment process parameters, such as heating rate, holding temperature, holding time, cooling rate and number of cycles, on the microstructure of the as-cast TiAl-based alloy were studied by orthogonal design test (L16 (45) Tissue and microhardness (HV5) effects. The results show that: the cyclic heat treatment process can improve the microhardness to varying degrees, increasing the maximum amplitude of 40%; the impact of various factors according to the size followed by the heating rate, holding time, holding temperature, cooling rate, cycle times. Different types of microstructure can be obtained by cyclic heat treatment. On the basis of orthogonal test, the optimized heat treatment process was determined and a fine microstructure was obtained.