Studies on the hot corrosion of a nickel-base superalloy,Udimet 700 |
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Authors: | Ajay K Misra |
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Affiliation: | (1) Department of Metallurgy and Materials Science, NASA, Case Western Reserve University, USA;(2) Present address: Lewis Research Center, Cleveland, Ohio |
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Abstract: | The hot corrosion of a nickel-base superalloy, Udimet 700, has been studied in the temperature range 900–950°C. The effect of the amount of Na
2SO4 on the corrosion kinetics was determined. Large weight gains and severe corrosion were associated with two different modes of degradation: (1) formation of large, interconnected sulfides beneath the external scale, and (2) formation of a Na2MoO4-MoO3 melt. The corrosion due to formation of the Na2MoO4-MoO3 melt occurred for all the salt-coating thicknesses, whereas, large sulfides were formed only for the heavier coatings of Na2SO4. The formation of Na2MoO4-MoO3 melt required an induction period, and the length of the induction period was observed to be a function of the amount of Na2SO4 and of temperature.Work funded under NASA Grant NCC 3-43. |
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Keywords: | nickel-base superalloy hot corrosion sodium sulfate |
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