Microstructure development during dissimilar welding: Case of laser welding of Ti with Ni involving intermetallic phase formation
Microstructure development during dissimilar welding: Case of laser welding of Ti with Ni involving intermetallic phase formation
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DOI：
10.1007/s10853-006-6480-4
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发表时间：
2006-02
影响因子：
4.5
通讯作者：
S. Chatterjee;T. Abinandanan;K. Chattopadhyay
中科院分区：
文献类型：
--
作者：
S. Chatterjee;T. Abinandanan;K. Chattopadhyay
研究了Ti/Ni异种金属激光焊接接头的凝固组织变化。在Ti和Ni的熔合界面处，基体金属晶粒向焊池中的生长受到熔体中存在的成分梯度的抑制。在Ti熔合界面处，Ti 2Ni枝晶向母材方向生长。在Ni侧，镍固溶体相的出现之后是Ni 3 Ti、Ni 3 Ti +NiTi共晶和NiTi层。焊缝中部组织为NiTi枝晶和Ti 2Ni。在整个焊缝中观察到孤立的钛枝晶，但其朝向焊缝顶面的优先出现更为突出。结果合理化的基础上的相互作用的运输过程中的焊接与热力学的Ti-Ni系统。
Development of solidification microstructure in a laser welded Ti/Ni dissimilar binary couple is presented. At the fusion interfaces in both Ti and Ni, growth of the base metal grains into the weld pool is inhibited by the presence of composition gradients in the melt. Ti2Ni dendrites growtowardthe base metal at the Ti fusion interface. In the Ni side, appearance of a nickel solid solution phase is followed by layers of Ni3Ti, Ni3Ti+NiTi eutectic, and NiTi. NiTi dendrites and Ti2Ni constitute the microstructure in the middle of the weld. Isolated titanium dendrites are observed throughout the weld, but their preferential occurrence toward the top surface of the weld is more prominent. Results are rationalised on the basis of interplay of the transport processes in the weld with the thermodynamics of the Ti-Ni system.