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Aging of cast Ni-base heat resisting alloy

Abstract The behaviour of a Ni-base heat resisting alloy during aging was studied by mechanical testing and by optical and electron microscopy in samples aged for up to 6 weeks at 750°C. The as cast microstructure consists of an austenitic matrix and a network of two types of primary carbide (chromium and niobium). As aging proceeds, the main changes detected were precipitation of secondary chromium carbides and decomposition of primary niobium carbide in Ni rich silicide. The primary chromium carbides were largely unaltered. The mechanical tests indicate that these phenomena degrade the properties of the material.