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Article Dans Une Revue Oxidation of Metals Année : 2018

Effect of NbC Addition on the High-Temperature Oxidation Resistance of Co- and Ni-Based Chromium-Rich Alloys

Mélissa Ritouet
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Patrice Berthod

Résumé

Two {M-25Cr}-based alloys, with M=Co or Ni, containing 0.5C and 3.9Nb (wt.%) to favor the crystallization of NbC carbides during solidification were elaborated by casting and subjected to oxidation in air at 1000, 1100 and 1200°C for 46 hours. The results were studied by comparison with recent similar ones obtained with Nb-free ternary alloys issued from the same elaboration protocol and tested in oxidation in the same conditions. In both cases interdendritic script-like shaped NbC carbides were obtained as expected, however not as single carbides in the nickel alloy which also contain chromium carbides. Preliminary exposure to 1200°C having shown a morphological evolution of the NbC, as-cast and preliminarily aged versions of both alloys were tested in oxidation. It appeared first that, whatever the aged state, the cobalt alloy behaved much worse than the nickel one, that the presence of Nb deteriorated the behavior in both cases but at a much lower scale and that aging alloys, which results in NbC fragmentation, was also detrimental for the high temperature oxidation behavior.
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hal-02181316 , version 1 (12-07-2019)

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Mélissa Ritouet, Patrice Berthod. Effect of NbC Addition on the High-Temperature Oxidation Resistance of Co- and Ni-Based Chromium-Rich Alloys. Oxidation of Metals, 2018, 89 (3-4), pp.339-355. ⟨10.1007/s11085-017-9790-9⟩. ⟨hal-02181316⟩
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