金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 190-194.DOI: 10.13251/j.issn.0254-6051.2024.02.029

• 工艺研究 • 上一篇    下一篇

时效温度对TB18钛合金组织和力学性能的影响

胡生双1, 陈素明1, 颜家维1, 岳珊1, 高晓颖1, 欧阳德来2   

  1. 1.中航西安飞机工业集团股份有限公司, 陕西 西安 710089;
    2.南昌航空大学 材料科学与工程学院, 江西 南昌 330063
  • 收稿日期:2023-06-17 修回日期:2023-12-12 出版日期:2024-03-27 发布日期:2024-03-27
  • 通讯作者: 欧阳德来,教授,E-mail:ouyangdelai@163.com
  • 作者简介:胡生双(1989—),男,高级工程师,主要研究方向为金属材料,E-mail:hushengshuang2000@163.com。

Effect of aging temperature on microstructure and mechanical properties of TB18 titanium alloy

Hu Shengshuang1, Chen Suming1, Yan Jiawei1, Yue Shan1, Gao Xiaoying1, Ouyang Delai2   

  1. 1. AVIC Xi'an Aircraft Industry Group Co., Ltd., Xi'an Shaanxi 710089, China;
    2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang Jiangxi 330063, China
  • Received:2023-06-17 Revised:2023-12-12 Online:2024-03-27 Published:2024-03-27

摘要: 利用拉伸试验机、光学显微镜和扫描电镜等手段研究了不同时效温度对TB18钛合金力学性能和组织的影响。结果表明,随着时效温度升高,TB18钛合金抗拉强度和屈服强度不断降低,伸长率和断面收缩率提高。从强度和塑性综合考虑,当时效温度为530 ℃时,TB18钛合金的综合力学性能最好。此时抗拉强度为1285.5 MPa,屈服强度为1206 MPa,伸长率为7.8%,断面收缩率为16%。TB18钛合金锻态是典型的等轴组织,经870 ℃×2 h,空冷固溶处理后为等轴β晶粒,晶粒尺寸为200~250 μm。TB18钛合金经不同温度时效后,次生α相的微观形貌相似,均为片层状。随着时效温度的升高,合金内部析出的次生α相片层尺寸呈增大趋势。

关键词: TB18钛合金, 时效温度, 力学性能, 组织

Abstract: Effect of aging temperature on microstructure and mechanical properties of the TB18 titanium alloy was investigated by means of tensile testing machine, optical microscope and scanning electron microscope. The results indicate that with the aging temperature increasing, the tensile strength and yield strength decrease, while the elongation and the percentage reduction of area increase. Considering both the strength and plasticity, the best comprehensive mechanical properties of the alloy are achieved when aged at 530 ℃, where the tensile strength is 1285.5 MPa, the yield strength is 1206 MPa, the elongation is 7.8%, and the percentage reduction of area is 16%. The microstructure of forged TB18 titanium alloy is a typical equiaxed structure. After solution treatment at 870 ℃ for 2 h and then air cooling, the microstructure is consist of β grains with the size of 200-250 μm. After aging at different temperatures, the micro morphologies of the secondary α phases are similar, all with layered characteristics. With the increase of aging temperature, the size of secondary α phase lamella in the alloy showing an increasing tendency.

Key words: TB18 titanium alloy, aging temperature, mechanical properties, microstructure

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