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The effect of Ru on two kinds of cast nickel-base superalloys in as-cast, heat-treated and oxidation tested specimens has been characterised by optical metallography and scanning electron microscopy. The evaluation of microstructure confirms the distribution of Ru in various phases, the beneficial role of Ru in stabilising microstructure, delaying formation of M& and increasing incipient melting temperature of the alloys. The role of Ru oh oxidation resistance is different in various kinds of alloy; in Hf-bearing alloys, it has a beneficial effect, but in a 1.5% Cr alloy, the effect of Ru is not obvious.

Effect of RU Addition on Cast Nickel Base Superalloy with Low Content of CR and High Content of W