田胜利 董利民 胡明 雷晓飞 张金虎 杨锐. O、Fe含量对TB9钛合金丝材显微组织和力学性能的影响[J]. 金属学报, DOI: 10.11900/0412.1961.2025.00061.

摘要 参考文献 相关文章 Metrics 全文: PDF(2417 KB)   摘要: TB9 (Ti-3Al-8V-6Cr-4Mo-4Zr，质量分数，%)钛合金丝材是制作航空紧固件、弹簧等的关键材料，但是关于微量元素O、Fe含量对TB9钛合金丝材的显微组织和力学性能影响缺乏系统研究和有效控制，常造成零部件性能不稳定。针对这个问题，本工作研究了O、Fe元素含量对固溶态、固溶时效态、固溶后冷拉拔变形态以及冷拔拉后时效态等4种不同状态的TB9钛合金丝材显微组织和力学性能的影响，为该合金丝材的性能优化和稳定性控制提供指导。结果表明，O元素通过固溶强化、晶粒细化和调控α相析出及界面偏聚效应等影响TB9钛合金丝材的组织和性能。在固溶状态下，O通过固溶强化和减小晶粒尺寸的作用使合金强度提高，塑性略有下降。固溶处理后直接时效状态下，490 ℃时效时α析出相遍布整个晶粒，合金强度达到峰值，当O含量为0.11%时，合金抗拉强度达到了1357 MPa，且具有较好的强塑性匹配性能，但当O含量达到0.14%时，合金发生脆断。冷拉拔变形使不同状态合金的强度显著增加，冷拉拔后时效处理时，α相的析出温度大幅降低，强度显著高于直接进行固溶时效强化的合金，O含量为0.11%的合金在520 ℃时效时强度达到了1453MPa，且具有较好的综合性能，但过量的O加入会引起合金脆断。在TB9合金中，Fe元素主要通过固溶强化和对晶粒尺寸的影响来影响合金的性能，作用较弱。因此，适量O元素的加入有助于获得高强度的TB9合金丝材，但过量O的加入会使合金脆化，对于工程化应用O元素含量应控制在0.11%以下；在标准规定的含量上限范围内，加入Fe元素对合金的组织和性能影响较小。 关键词 ： TB9钛合金,  合金成分,  冷拉拔,  时效处理,  力学性能     Abstract：TB9 (Ti–3Al–8V–6Cr–4Mo–4Zr, mass fraction, %) titanium alloy wires are critical materials for aerospace fasteners, springs, and related components. However, systematic research on the effects contents of trace elements such as O and Fe on the microstructure and mechanical properties of TB9 wires remains insufficient, and effective control measures are lacking, often resulting in unstable properties of the fabricated parts. To address the abovementioned issues, this study investigates the effects of O and Fe contents on the microstructure and mechanical properties of TB9 alloy wires in four different states: solution-treated, solution-treated and aged, solution-treated followed by cold drawing, and cold drawn followed by aging. This investigation provides guidance for property optimization and stable process control of the alloy. The results show that O content affects the microstructure and properties of TB9 through mechanisms such as solid solution strengthening, grain refinement, modulation of α-phase precipitation, and interfacial segregation. In the solution-treated state, increasing O content increases alloy strength through solid solution strengthening and grain size reduction, with a slight decrease in ductility. Upon direct aging at 490 °C after solution treatment, α-phase precipitates uniformly in the grains, leading to peak strength. At an O content of 0.11%, an ultimate tensile strength of 1357 MPa is achieved with a favorable strength–ductility balance. However, when the O content increases to 0.14%, brittle fracture occurs. Cold-drawn deformation considerably increases the strength of all alloys. During subsequent aging, the α-phase precipitation temperature decreases considerably, resulting in substantially higher strength compared to solution-treated and aged alloys. The alloy containing 0.11%O achieves an ultimate tensile strength of 1453 MPa and improved ductility after aging at 520 °C. However, excessive O addition leads to embrittlement. In the TB9 alloy, minor variations in Fe content primarily affect properties through solid solution strengthening and grain refinement, but the influence is minimal. Therefore, an optimal O content below 0.11 wt.% is beneficial for achieving high-strength TB9 alloy wires, while excessive oxygen should be avoided in engineering applications owing to its embrittlement effect. Iron content, in the standard range, has a negligible impact on the microstructure and mechanical properties. Key words： TB9 titanium alloy    alloy composition    cold drawing    aging treatment    mechanical property 收稿日期: 2025-03-04      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 田胜利 董利民 胡明 雷晓飞 张金虎 杨锐 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] D. Eylon,S.R. Seagle. Titanium technology in the USA-an overview. Mater. Sci. Technol., 2001, 17(4):439-443 [2] Jinshan LI, Bin TANG, Jiangkun FAN, et al.Deformation Mechanism and Microstructure Control of High Strength Metastable β Titanium Alloy[J]. 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