【摘要】 利用光学显微镜，研究了冷却速度对锻造Ｔｉ４８Ａｌ２Ｃｒ（原子数分数，％）组织演变的影响．结果表明：冷却速度主要影响锻造ＴｉＡｌ基合金组织演变产物的形貌，而对晶团尺寸的影响较小．锻造ＴｉＡｌ基合金在α相转变温度θα以上等温热处理后，采用炉冷、空冷、油冷和水冷，会依次转变为全层状组织、层状组织加魏氏体组织、块状转变组织加魏氏体组织、块状转变组织加羽毛状组织更多还原

【Abstract】 The effect of cooling rate on the microstructure evolution of a forged TiAl based alloy was investigated through optical microscope. The results show that cooling rate affected the morphology of the microstructure of a forged TiAl based alloy, but had little influence on the colony size. When the alloys, that were isothermally heat treated at temperatures above the alpha transus , were cooled in furnace, air, oil and water, the following products were observed respectively: fully lamellar structure, lamellar structure and widmanstatten structure, massive transformation structure and widmanstatten structure, massive transformation structure and feathery structure.更多还原