Effects of silicon on the oxidation,hot-corrosion,and mechanical behavior of two cast nickel-base superalloys |
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Authors: | Robert V Miner |
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Affiliation: | (1) NASA-Lewis Research Center, 44135 Cleveland, OH |
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Abstract: | Cast specimens of nickel-base superalloys 713C and Mar-M200 with nominal additions of 0, 0.5, and 1 wt pct Si were evaluated
for oxidation and corrosion resistance, tensile and stress-rupture properties, microstructure, and phase relations. Results
are com-pared with those of an earlier study of the effects of Si in B-1900. Si had similar effects on all three superalloys.
It improves oxidation resistance but the improvement in 713C and Mar-M200 was considerably less than in B-1900. Hot-corrosion
resistance is also improved somewhat. Si is, however, detrimental to mechanical properties, in particular, rupture strength
and tensile ductility. Si has two obvious microstructural effects. It in-creases the amount of γ precipitated in eutectie
nodules and promotes a Mo(Ni,Si)2 Laves phase in the alloys containing Mo. These microstructural effects do not appear responsible for the degradation of mechanical
properties, however. |
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