摘要
针对高强TA18钛合金管材制备对组织细小均匀棒坯的需求,利用金相显微镜及EBSD测试技术研究了经精锻和热轧两种工艺加工后直径为40 mm的TA18钛合金棒材α相的微观组织差异、织构差异及力学性能变化,后续对棒材分别进行了700℃、1.5 h和800℃、1.5 h的退火处理,分析了热处理对TA18钛合金棒材α相组织及力学性能的影响。结果表明:TA18合金经过精锻和热轧工艺后均可以得到均匀的显微组织,棒材的边部和心部具有相同的织构类型,α晶粒表现出明显的集中取向,呈现出<10-10>丝织构,精锻后合金的力学性能与轧制后基本一致。退火处理后,合金的晶粒尺寸和分布仍相对均匀,各部位的织构类型没有发生明显改变,但是织构强度有所减弱。且经过800℃、1.5 h的退火处理后的精锻棒材,其边部和心部的显微组织更为均匀。
In order to obtain the bar billet with fine and uniform microstructure for producing highstrength TA18 titanium alloy tube,the microstructure,texture and mechanical properties of TA18 titanium alloy bars with a diameter of 40 mm after radial precision forging and hot rolling were investigated by metallographic microscopy and electron backscatter diffraction(EBSD)technique.The bars were subsequently annealed for 1.5 h at 700℃and 800℃,respectively.The influence of subsequent heat treatment on theα-phase microstructure and mechanical properties were analyzed.It is found that TA18 alloy can achieve uniform microstructures after both radial precision forging and hot rolling,and the edge and center regions of the bar have the same texture type,where theα-grains exhibited strong preferred orientation and presented<10-10>fiber texture.The mechanical properties of the alloy after radial precision forging and hot rolling were basically consistent.The grain size and distribution of the alloy were still relatively uniform after annealing,and the texture type of each part was basically unchanged,but the texture intensity was weakened.After annealing at 800℃for1.5 h,the microstructures of the radial precision forging bar at the edge and center position were more uniform.
作者
霍思含
邱建科
李雕峰
张志强
赵宇爽
吕逍
张慧博
Huo Sihan;Qiu Jianke;Li Diaofeng;Zhang Zhiqiang;Zhao Yushuang;Lv Xiao;Zhang Huibo(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110159,Liaoning,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,Guangdong,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第6期89-99,共11页
Iron Steel Vanadium Titanium
基金
中国科学院青年创新促进会(2022188)
国家自然科学基金(91960202、51701219)
国家重点研发计划(2021YFC2800503)
南方海洋科学与工程广东省实验室(珠海)创新团队建设项目(311021013)
师昌绪先进材料创新中心开放基金(JJ2021030、2021-231)。
关键词
TA18钛合金
微观组织
织构
热处理
力学性能
TA18 titanium alloy
microstructure
texture
heat treatment
mechanical properties