冷速对TC11合金β加工显微组织和力学性能的影响  

INFLUENCE OF COOLING RATE ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF BATA PROCESSED TC11 ALLOY

作　　者：曾卫东[1] 周义刚[1] 

机构地区：[1]西北工业大学材料科学与工程学院,西安710072

出　　处：《金属学报》2002年第12期1273-1276,共4页Acta Metallurgica Sinica

摘　　要：研究了TC11钛合金β加工后不同冷却速度对显微组织和力学性能的影响.结果表明,水冷可以减少晶界α的析出,晶内得到短、细、无规排列的针状α组织;采用空冷（尤其是炉冷）,晶界α连续完整,晶内α粗大、平直,并有大块α出现β锻造后快速冷却在提高强度的同时改善了塑性,水冷的强度比空冷的强度约高出30MPa,而塑性明显高于空冷.可见,β锻后采用水冷是提高合金塑性的有效方法.The effect of cooling rate on microstructure and mechanical properties of 0 processed TC11 alloy is investigated. It is shown that if using water cooling, the precipitation of boundary a phases is prohibited, but much short, fine and disordered needle a phases precipitate within primary 0 grains. On the contrary, if using air cooling, some continuous and thick a phases precipitate at grain boundary, and much coarse and flat a phases precipitate within primary 03 grains. It is also shown that the cooling rate has a strong influence on both strength and ductility. The water cooled specimen has a higher strength of about 30 MPa than the air cooled one, and the former possesses an obviously higher ductility than the later. It is concluded that water cooling is one of the most effective method for improving the ductility of titanium alloys.

关 键 词：显微组织 TC11合金 冷速 Β锻造 力学性能 钛合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG3[金属学及工艺—金属材料]