固溶冷速对超高强钛合金TB17组织及力学性能的影响  

Effect of Solution Cooling Rate on Microstructure and Mechanical Properties of Ultra-high Strength Titanium Alloy TB17

作　　者：纪晓宇 徐建伟[1] 张宇 李明兵 曾卫东[1] 朱知寿 Ji Xiaoyu;Xu Jianwei;Zhang Yu;Li Mingbing;Zeng Weidong;Zhu Zhishou(State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China;Key Laboratory of Advanced Titanium Alloys,Beijing Institute of Aeronautical Materials,AeroEngine Corporation of China,Beijing 100095,China)

机构地区：[1]西北工业大学材料学院凝固技术国家重点实验室,陕西西安710072 [2]中国航空发动机集团北京航空材料研究院先进钛合金重点实验室,北京100095

出　　处：《稀有金属材料与工程》2025年第3期665-670,共6页Rare Metal Materials and Engineering

基　　金：航空科学基金(2022Z047053001);陕西省重点研发计划(2024GX-YBXM-349)。

摘　　要：研究了不同冷却速度对TB17钛合金合金组织演变和拉伸性能的影响规律。结果表明:冷却速度对组织形貌有显著影响,当冷速较慢时,合金元素扩散充分,粗片层含量较高、尺寸较大,基体中有少量的次生α相析出;当冷速较快时,高温下的组织被大量保留,粗片层含量较少、尺寸较小,几乎观察不到次生α相。由于未受外力作用,片状α相与β相保持严格的Burgers取向对应关系。固溶冷速极大地影响拉伸性能,固溶空冷析出大量次生α相,使得强度最高;固溶水冷由于冷速较快,仅保留粗片层,强度最低;固溶炉冷由于冷速过慢,粗片层长大明显,抑制了次生α相的析出,强度居中。时效处理后,拉伸性能发生不同的变化,水冷强度最高,而炉冷强度最低。The effects of different cooling rates on the microstructure evolution and tensile properties of TB17 titanium alloy were studied.The results show that the cooling rate has a significant effect on the microstructure.When the cooling rate is low,the alloying elements are diffused fully,resulting in higher content and larger size of coarse lamellar layers,and a small amount of secondaryαphase is precipitated in the matrix.When the cooling rate is high,a large amount of microstructure at high temperature is preserved,so that the coarse lamellar content is low and the size is small,and the secondaryαphase is hardly observed.Due to the absence of external forces,the lamellarαphase maintains a strict Burgers orientation correspondence with theβphase.The tensile property is greatly affected by the solution cooling rate.A large amount of secondaryαphase is precipitated during air-cooling(AC),which results in the highest strength.Due to the faster cooling speed,only the coarse layer is retained during water-quenching(WQ),resulting in the lowest strength.The cooling rate of furnace-cooled(FC)is too slow,so the coarse lamellar growth is obvious.This inhibits the precipitation of secondaryαphase,and leads to the middle intensity.After aging treatment,the tensile properties change differently.WQ has the highest strength,while FC has the lowest strength.

关 键 词：TB17钛合金 热处理 冷速 组织演变 拉伸性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]