Behavior of three cast chromium-rich cobalt-based alloys in oxidation at 900°C in a 100% water vapour atmosphere
Résumé
Beside the famous single-crystalline γ/γ' superalloys other metallic alloys retain high interest for some high temperature applications. This is for example the case of the foundry-made cobalt-based superalloys family. These alloys may offer to the users high mechanical strength in service at elevated temperature as well as correct resistance against oxidation by gases and corrosion by molten salts. A typical example of use is as the constitutive material of glass working tool for shaping molten glass. The oxidative gaseous milieu in which cast cobalt-based superalloys work the most often are dry or wet air, or mixtures of burner gases. However there are applications, notably in the nuclear power field, in which hot gases may contain very high quantities of water vapour and for which cobalt-based superalloys may be considered. Their behaviour in such water-rich gaseous environment seems to be never investigated and this is the reason why testing a little series of cast cobalt-based alloys in pure water vapour was decided here.
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