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Microstructure evolution of diffusion welded 304L/Zircaloy 4 with copper interlayer

Abstract : Diffusion-welding of 304L stainless steel with Zircaloy4 was performed with a copper interlayer. All the samples are composed of a reaction layer and a diffusion-affected zone in the Zircaloy4. Two reaction regimes were identified: (i) involving a liquid phase on the Zircaloy4 side leading to a fast dissolution and (ii) involving solid state reaction on the 304L stainless steel which is consequently less affected. The reaction layers contains numerous phases that were identified as the C36- and C14-Fe2Zr Laves phases and the cubic and tetragonal polymorphs of the FeZr2 intermetallic. The multiplication of the phases with Cu addition results in the interaction with chromium since the Cr-rich C36 phase and the t-FeZr2 phases have limited solubility in Cu and Cr, respectively, leading to the stabilization of phases where this solubility is increased, e.g. the C14 Laves phase and the c-FeZr2. While in the processing conditions tested the copper interlayer was totally dissolved for all the temperature >1223 K, leading to the occurrence of embrittling Laves and intermetallic phases, the presence of copper lead to a significant softening of the weld. The best properties were obtained with the microstructures formed at 1223 K.
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Contributor : Julien Zollinger Connect in order to contact the contributor
Submitted on : Thursday, November 7, 2019 - 1:24:21 PM
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D. Aboudi, S. Lebaili, M. Taouinet, Julien Zollinger. Microstructure evolution of diffusion welded 304L/Zircaloy 4 with copper interlayer. Materials & Design, 2017, 116, pp.386-394. ⟨10.1016/j.matdes.2016.12.008⟩. ⟨hal-02353590⟩



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