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Microstructure Formation in Dissimilar Metal Welds: Electron Beam Welding of Ti/Ni

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Abstract

We present results for electron beam welding of a binary Ti/Ni dissimilar metal couple. The difference in physical properties of the base metals and metallurgical features (thermodynamics and kinetics) of the system influence both macroscopic transport and microstructure development in the weld. Microstructures near the fusion interfaces are markedly different from those inside the weld region. At the Ti side, Ti2Ni dendrites are observed to grow toward the fusion interface, while in the Ni side, layered growth of γ-Ni, Ni3Ti, and Ni3Ti + NiTi eutectic is observed. Different morphologies of the latter eutectic constitute the predominant microstructure inside the weld metal region. These results are compared and contrasted with those from laser welding of the same binary couple, and a scheme of solidification is proposed to explain the observations. This highlights notable departures from welding of similar and other dissimilar metals such as a significant asymmetry in heat transport that governs progress of solidification from each side of the couple, and a lack of unique liquidus isotherm characterizing the liquid–solid front.

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Authors and Affiliations

  1. Indian Institute of Technology Hyderabad, Kandi, Sangareddy, 502285, India

    Subhradeep Chatterjee (Assistant Professor)

  2. Indian Institute of Science, Bangalore, 560012, India

    T. A. Abinandanan (Professor) & Kamanio Chattopadhyay (Honorary Professor)

  3. Defence Metallurgical Research Laboratory, Hyderabad, 500058, India

    G. Madhusudhan Reddy (Scientist G)

Authors
  1. Subhradeep Chatterjee
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  2. T. A. Abinandanan
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  3. G. Madhusudhan Reddy
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  4. Kamanio Chattopadhyay
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Correspondence to Subhradeep Chatterjee.

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Manuscript submitted July 13, 2015.

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Chatterjee, S., Abinandanan, T.A., Reddy, G.M. et al. Microstructure Formation in Dissimilar Metal Welds: Electron Beam Welding of Ti/Ni. Metall Mater Trans A 47, 769–776 (2016). https://doi.org/10.1007/s11661-015-3255-z

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