摘要
以航空发动机用TC4合金三级转子叶片为研究对象,对其进行不同温度(600~950℃)和不同冷却方式(空冷、水冷)的退火处理,利用OM、SEM以及EBSD对组织进行分析,利用维氏硬度计和拉伸试验机对显微硬度和室温力学性能进行检测,研究退火处理对TC4钛合金叶片组织与力学性能的影响。结果表明,退火温度低于850℃时,随退火温度升高,α相体积分数变化不大,α相晶粒尺寸约为12μm。当退火温度超过850℃时,组织中出现了针状α相。当退火温度低于900℃时,空冷试样的硬度比水冷高出5~10HV0.2。当退火温度超过850℃后,针状α相含量增加,显微硬度迅速增加。退火温度为600℃时,强度最大,伸长率较低;空冷条件下,退火温度为800℃时,抗拉强度达到1033.7MPa,伸长率为23.2%,叶片综合力学性能最优。
TC4 alloy third-stage rotor blade for aeroengine was annealed at different temperatures(600-950℃)with different cooling methods(air cooling and water cooling).The microstructure was analyzed by OM,SEM and EBSD.The microhardness and mechanical properties at room temperature were tested by Vickers hardness tester and tensile testing machine.The effect of annealing treatment on the microstructure and mechanical properties of the TC4 titanium alloy blades was studied.The results show that the volume fraction ofαphase changes little with the increase of annealing temperature below 850℃,and the grain size ofαphase is about 12μm.When the annealing temperature exceeds 850℃,the acicularαphase appears in the microstructure.When the annealing temperature is below 900 ℃,the hardness of the air-cooled specimen is 5-10 HV0.2 higher than that of the water-cooled specimen.When the annealing temperature exceeds 850℃,the content of acicularαphase increases and the microhardness rapidly increases.The maximum strength appears at the annealing temperature of 600℃,but with relatively low elongation.Under air cooling conditions,at annealing temperature of 800℃,the tensile strength reaches 1033.7 MPa,the elongation is 23.2%,and the comprehensive mechanical properties of the blade are optimal.
作者
王庆娟
杜旭东
蒋立
李之怡
刘丹
王伟
Wang Qingjuan;Du Xudong;Jiang Li;Li Zhiyi;Liu Dan;Wang Wei(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China;Shaanxi Changyu Aviation Equipment Co.,Ltd.,Xi'an Shaanxi 710299,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第10期126-132,共7页
Heat Treatment of Metals
基金
国家自然科学基金(52174371)
陕西长羽航空装备股份有限公司项目(20220554)。
关键词
TC4钛合金叶片
退火处理
组织
硬度
力学性能
TC4 titanium alloy blade
annealing
microstructure
hardness
mechanical properties
