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The welding metallurgy of HASTELLOY alloys C-4, C-22, and C-276

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Abstract

The welding metallurgy (solidification and solid state transformations) of HASTELLOY* Alloys C-4, C-22, and C-276 has been determined. Varestraint hot-cracking tests performed on commercial alloys revealed a weldability ranking as follows: C-4 > C-22 > C-276. All alloys would be expected to have good weldability, with Alloy C-4 having a very low hot-cracking tendency, comparable to 304L stainless steel. Microstructures of gas-tungsten-arc welds of these alloys have been characterized by scanning electron microscopy and analytical electron microscopy. Intermetallic secondary solidification constituents have been found associated with weld metal hot cracks in Alloys C-276 and C-22. In Alloy C-276, this constituent is a combination ofP and ώ phases, and in Alloy C-22, this constituent is composed of σ,P, and ώ phases. With phase composition data obtained by AEM techniques and available ternary (Ni-Cr-Mo) phase diagrams, an equivalent chemistry model is proposed to account for the microstructures observed in each alloy's weld metal.

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Authors and Affiliations

  1. Process Metallurgy, Sandia National Laboratories, P.O. Box 5800, 87185, Albuquerque, NM

    M. J. Cieslak (Div. 1833)

  2. Electron Optics and X-Ray Analysis, Sandia National Laboratories, P.O. Box 5800, 87185, Albuquerque, NM

    T. J. Headley (Div.1822)

  3. Physical Metallurgy, Sandia National Laboratories, P.O. Box 5800, 87185, Albuquerque, NM

    A. D. Romig (Div. 1832)

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  1. M. J. Cieslak
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  2. T. J. Headley
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  3. A. D. Romig
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Cieslak, M.J., Headley, T.J. & Romig, A.D. The welding metallurgy of HASTELLOY alloys C-4, C-22, and C-276. Metall Trans A 17, 2035–2047 (1986). https://doi.org/10.1007/BF02645001

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