High temperature behaviour of chromium-nickel alloys with Ni varying from 50 to 0 wt.%
Résumé
Introduction: Need of metallic materials for applications at particularly elevated temperatures. Complex shapes of many pieces working at high temperature → foundry way Cobalt-based and even Nickel-based alloys not able for working at T > 1200°C. Chromium: one of the three well-known elements for combatting H.T. oxidation; also efficient for protecting refractory alloys from hot corrosion by molten substances. In addition Cr is a very refractory element: to be considered as bulk element. In this work, a series of binary Cr (50 to 100wt.%)-Ni alloys, possible bases for future more complex alloys, were cast and studied at H.T. The obtained microstructures issued from conventional foundry process were explored. The microstructures after long exposure to high temperature (1200°C) were characterized. Conclusions: This work demonstrated the feasibility of cast Cr-based alloys by classical foundry. Due to their dendritic microstructures and the hardening of both phases good intrinsic mechanical behaviour can be expected; the hardness evolution with their volume fractions can be modelized. The characterization of the high temperature creep and oxidation behaviours of these basis alloys are currently in progress.
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