Microstructure and mechanical properties of laser welded Ti–22Al–27Nb/TC4 dissimilar alloys
Microstructure and mechanical properties of laser welded Ti–22Al–27Nb/TC4 dissimilar alloys
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DOI：
10.1016/j.msea.2012.09.057
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发表时间：
2013
期刊：
影响因子：
6.4
通讯作者：
Z. Lei;Z. Dong;Yan-bin Chen;L. Huang;R. Zhu
中科院分区：
文献类型：
--
作者：
Z. Lei;Z. Dong;Yan-bin Chen;L. Huang;R. Zhu
采用激光焊接方法对2.5mm厚的Ti-22 Al-27 Nb（at%）合金和TC 4（Ti-6Al-4V，wt%）合金进行了焊接。研究了激光焊接接头的显微组织和力学性能。结果表明，采用激光焊接方法可以获得质量良好的接头。Ti-22 Al-27 Nb合金热影响区（HAZ）形成B2相和少量残留的粗大α 2相。TC 4合金热影响区主要由马氏体α′相、针状α相和初生α相组成。焊缝金属主要由B2相和马氏体α′相组成。热影响区的显微硬度高于熔合区和母材。熔合区的显微硬度值最低。接头的平均抗拉强度可达TC 4母材的92%左右，但接头的延伸率低于TC 4母材的40%。
Laser welding was applied to join 2.5mm thick dissimilar metals of Ti–22Al–27Nb (at%) alloy and TC4 (Ti–6Al–4V, wt%) alloy. The microstructure characterization and the mechanical properties of the laser welded joints were investigated. The results show that a well-quality joint can be obtained using laser welding method. The B2 phase and a little residual coarse α2phase are formed in heat affected zone (HAZ) of Ti–22Al–27Nb alloy. The heat affected zone of TC4 alloy mainly consists of a mixture of martensitic α′, acicular α, and primary α phase. The weld metal is mainly composed of B2 phase and martensitic α′ phase. The microhardness values of heat affected zone are higher than that of fusion zone (FZ) and the base metal. And the fusion zone exhibits the lowest microhardness values in the welded joint. The average tensile strength of the joints can reach about 92% of the TC4 parent metal, but the elongation of the joints is found to be less than 40% of the TC4 parent metal.