金属热处理 ›› 2022, Vol. 47 ›› Issue (11): 70-75.DOI: 10.13251/j.issn.0254-6051.2022.11.011

• 工艺研究 • 上一篇    下一篇

冷变形及时效对新型β钛合金组织性能的影响

李健, 庄宇盛, 李春慧, 李壮, 蔡文豪, 吕坤琪, 张利   

  1. 沈阳航空航天大学 材料科学与工程学院, 辽宁 沈阳 110136
  • 收稿日期:2022-06-19 修回日期:2022-09-27 出版日期:2022-11-25 发布日期:2023-01-04
  • 通讯作者: 李壮,教授,博士,E-mail:Lizhuang20047@163.com
  • 作者简介:李健(2000—),男,主要研究方向为金属材料的组织与性能,E-mail:1751386727@qq.com。
  • 基金资助:
    国家高技术研究发展计划(863计划)(2015AA03A501);沈阳航空航天大学大学生创新创业训练计划(S202110143014)

Effect of cold rolling and aging on microstructure and properties of novel β-titanium alloys

Li Jian, Zhuang Yusheng, Li Chunhui, Li Zhuang, Cai Wenhao, Lü Kunqi, Zhang Li   

  1. College of Materials Science and Engineering, Shenyang Aerospace University, Shenyang Liaoning 110136, China
  • Received:2022-06-19 Revised:2022-09-27 Online:2022-11-25 Published:2023-01-04

摘要: 对两种新型β钛合金采用不同的变形量冷轧,并在650 ℃时效不同时间后,对其组织和性能进行了研究。结果表明,随着冷轧变形量的增加,组织产生大量的位错、孪晶等晶体缺陷和应力诱发马氏体转变,β钛合金的硬度增加。β钛合金经过30%和40%冷轧,650 ℃时效9 h时,其硬度、强度达到最大值,此时析出的次生α相数量最多、最弥散,强化效果最好。Ti-3573和Ti-3873合金经50%冷轧,分别时效6 h和3 h时,因变形量增大,晶体缺陷增多,在时效过程中次生α相在缺陷处优先形核,其硬度、强度达到峰值。Ti-3873合金因富含较多的β稳定元素,其性能优于Ti-3573合金。

关键词: β钛合金, 冷轧, 时效, 次生α相, 硬度

Abstract: Microstructure and properties of two new types β-titanium alloys after cold rolling with different deformation and aging at 650 ℃ for different time were studied. The experimental results show that a lot of dislocations, twins and stress-induced martensite transformation are produced and the hardness increases with the increase of reduction of cold rolling. When aged at 650 ℃ for 9 h, the hardness and strength of the β-titanium alloys cold rolled with reduction of 30% and 40% reach the maximum values, which result from a lot of finely dispersed secondary α phase providing effective precipitation strengthening. When aged at 650 ℃ for 6 h and 3 h, respectively, Ti-3573 and Ti-3873 alloys cold rolled with reduction of 50% have more crystal defects due to increased deformation, secondary α phases preferentially nucleate at defects, and the hardness and strength reach the peak values. The mechanical properties of Ti-3873 alloy which is enriched in β-stabilizing elements are better than those of the Ti-3573 alloy.

Key words: β-titanium alloys, cold rolling, aging, secondary α phase, hardness

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