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| EFFECTS OF NIOBIUM ON HOT-CORROSION RESISTANT PROPERTIES OF SOME NICKEL-BASE CAST SUPERALLOYS |
| Zhang Yun Zhao Hongen Guo Yanfen and Liu Jiale(Institute of Metal Research; Academia Sinica) |
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Abstract The hot-corrosion resistance of some commercial nickel-base cast superalloys containing different amounts of niobium were evaluated by crucible test and burner-rig test.Results indicated that the addition of niobium to those alloys containing smaller amount of chromium and forming Al_2O_3 scale was detrimental to their hot-corrosion resistance; the addition of a certain amount of niobium to those alloys having medium amount of chromium contents and forming Cr_2O_3 scale was beneficial; but when a relatively large amount of niobium was added, the hot-corrosion resistance of the superalloys decreased, because of the presence of massive η phase. On the basis of a large amount of analysis of corrosion products in the scale, it was shown that niobium could alter the composition of the oxide scales on the surface of the alloys studied, affecting their hot-eorrosion, esistance.
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Received: 25 February 1983
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Cite this article:
Zhang Yun Zhao Hongen Guo Yanfen and Liu Jiale(Institute of Metal Research; Academia Sinica). EFFECTS OF NIOBIUM ON HOT-CORROSION RESISTANT PROPERTIES OF SOME NICKEL-BASE CAST SUPERALLOYS. J Chin Soc Corr Pro, 1983, 3(1): 46-52.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1983/V3/I1/46
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