β热模锻TC17钛合金整体叶盘的显微组织与力学性能

摘要

TC17 titanium alloy blisk in the compressor of an aero-engine was successfully forged using beta-forging techniques .The microstructure was analyzed and the mechanical properties were tested .The results real that a desired basket-waved microstructure can be obtained by beta-forging techniques , in which prior beta grains get elongated along deformation direction with no obvious recrystallization ,αphase at grain boundary takes zigzag and discontinous shape , and the acicular are waved in basket form in the interior of βgrains.The microstructure exhibits superior mechanical properties.Tensile properties, creep, fracture toughness, high cycle fatigue are all complying with the design require-ments and have a large tolerance .%采用β热模锻工艺生产了某型号航空发动机压气机用TC17钛合金整体叶盘,分析了整体叶盘的显微组织并测试了力学性能.结果表明,β热模锻工艺生产的整体叶盘具有典型的网篮组织,原始β晶粒沿变形方向拉长,无明显再结晶;晶界α相呈弯折断续分布,晶内针状α相呈网篮状编织.这种网篮组织的TC17钛合金β锻造整体叶盘具有较优的综合力学性能,室温拉伸、 高温拉伸、 蠕变、 断裂韧性和高周疲劳性能均符合设计要求,且有较大的富裕量.