时效温度对TB15钛合金微观组织和力学性能影响  

Effects of Aging Temperature on Microstructure and Mechanical Properties of TB15 Titanium Alloy

作　　者：况云华 辛周媛 徐勇 朱琳 陈乐平[2] KUANG Yunhua;XIN Zhouyuan;XU Yong;ZHU Lin;CHEN Leping(AVIC Jiangxi Hongdu Aviation Industry Group Co.,Ltd.,Nanchang 330063,China;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]航空工业江西洪都航空工业集团有限责任公司,江西南昌330063 [2]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《热加工工艺》2024年第4期146-150,共5页Hot Working Technology

基　　金：航空科学基金项目(2020Z047056003);江西省重点研发计划项目(20202BBEL53012)。

摘　　要：采用扫描电镜、电子背散射衍射仪、X射线衍射仪和万能材料试验机等研究了不同时效温度对固溶态的TB15钛合金组织和力学性能的影响。结果表明:合金在单相区固溶后,组织主要由等轴β晶粒组成,在较低温度时效后,基体析出了针状α相和等温ω相,在β晶界附近出现无析出区(PFZ),随着时效温度的升高,PFZ和ω相消失,α相由针状向片状形貌转变,在晶界附近出现了晶界魏氏体α相(α_(WGB))。随时效温度的增加,合金硬度降低,抗拉强度先升高后下降,伸长率则相反。在500℃时效后合金抗拉强度达到峰值1431.73 MPa,但伸长率仅为3.82%;在530℃时效时合金获得较好的综合力学性能,此时的抗拉强度为1155 MPa,伸长率为7.21%。The effects of different aging temperatures on the microstructure and mechanical properties of TB15 titanium alloy in solid solution were investigated by scanning electron microscopy,electron backscatter scatter diffraction,X-ray diffraction and universal material testing machine.The results show that,the alloy is mainly composed of equiaxedβgrains after solution in the single phase zone.After aging at lower temperature,needle-likeαphase and isothermalωphase precipitate in the matrix,and a precipitation-free zone(PFZ)appears near theβgrain boundary.With the increase at aging temperature,the PFZ andωphases disappear,αphase changes from needle-like morphology to lamellar morphology,andαphase of grain boundary Widmanstätten(αWGB)appears near the grain boundary.With the increase of aging temperature,the hardness of the alloy decreases,the tensile strength increases first and then decreases,while the elongation is on the contrary.After aging at 500℃,the tensile strength of the alloy reaches the peak of 1431.73 MPa,but the elongation is only 3.82%.When the alloy is aged at 530℃,the comprehensivemechanical properties are better,thetensile strengthis 1155MPa andthe elongation is 7.21%.

关 键 词：TB15钛合金 时效温度 微观组织 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]