采用坩埚法和单管法评定了几种不同含铌量的商用镍基铸造高温合金的抗热腐蚀性能。结果指出:对于含铬量较低、形成Al_2O_3氧化膜的合金,加铌会损害其抗腐蚀性能;对于含铬量中等、形成Cr_2O_3氧化膜的合金,加入一定量的铌是有益的。如果铌的加入量过大,由于块状η相的出现,反而会使合金的抗热腐蚀性能降低。 通过对腐蚀层的分析,发现铌能改变合金表面氧化层的组成,从而影响了合金的抗热腐蚀性能。
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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