钎焊温度对TC4钛合金真空钎焊接头组织及性能影响研究
Study on the effect of brazing temperature on the organisation and properties of TC4 titanium alloy vacuum brazingθJoints Organisation and Properties
王许多 1秦优琼 1陈柏霖 1党晨洋 1陈宇航1
作者信息
- 1. 上海工程技术大学 材料科学与工程学院,上海 201620
- 折叠
摘要
通过自行设计、制备的Ti-38Zr-24Ni(wt.％)钎料真空钎焊TC4钛合金,在改变钎焊温度(900～990℃)条件下,对钎焊接头的组织及性能进行了研究.钎焊接头由三个区组成:扩散区、界面区和中心区.Ni和Zr原子扩散进入母材引起β-Ti转变形成扩散区,扩散区为共析组织α-Ti和(Ti,Zr)2Ni和剩余母材基体组成;界面区为层片状α-Ti和(Ti,Zr)2Ni共析组织组成;中心区为大块状(Ti,Zr)2Ni金属间脆性化合物和尺寸大小不一的层片状α-Ti+(Ti,Zr)2Ni组织组成.提高钎焊温度,扩散区和界面区的宽度增加,中心区的宽度降低,且钎缝中心IMC化合物的数量降低.采用钎焊温度990℃时获得最高抗剪强度,其值为647MPa.
Abstract
The organisation and properties of brazed joints were investigated by vacuum brazing TC4 titanium alloy with Ti-38Zr-24Ni (wt.％) brazing material designed and prepared by ourselves, and the brazed joints were investigated under the condition of changing the brazing temperature (900～990℃). The brazed joints were composed of three zones: diffusion zone, interface zone and centre zone. the diffusion zone was formed by the diffusion of Ni and Zr atoms into the base material causing β-Ti transformation, and the diffusion zone was composed of the eutectic tissues of α-Ti and (Ti,Zr)2Ni and the remaining base material; the in-terface zone was composed of the laminar α-Ti and (Ti,Zr)2Ni eutectic tissues; and the centre zone was composed of the bulk (Ti,Zr)2Ni. The central zone is composed of large (Ti,Zr)2Ni and intermetallic brittle compounds and laminar α-Ti+ (Ti,Zr)2Ni tissues of different sizes. Increasing the brazing temperature in-creased the width of the diffusion and interfacial zones, decreased the width of the central zone, and de-creased the amount of IMC compounds in the centre of the braze seam. The highest shear strength was ob-tained using a brazing temperature of 990 ℃ with a value of 647 MPa.
关键词
TC4/Ti-Zr-Ni钎料/真空钎焊/显微组织/力学性能Key words
TC4/Ti-Zr-Ni brazing/Vacuum brazing/Microstructure/Mechanical properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据