研究了含Al量不同的HK40合金在工业纯Ar气氛中的高温抗氧化性能, 用SEM、XRD等方法检查了氧化膜的形貌、结构与成分. 结果表明, 加入铝后合金表面在高温下形成均匀的Al2O3膜, 从而提高了合金的高温抗氧化性能; Al加入量为6 mass%时, 合金的高温抗氧化性能最好. 在1100℃时加Al的合金氧化增重遵从抛物线规律, 且随Al含量的增加, 抗氧化性能显著增强. 随着合金中Al添加量的增加, 高温氧化膜组成相(Cr2O3、CrMn1.5O4、MnCr2O4、Al2O3) 中的Al2O3逐渐增加. 同时Al的存在提高了表面氧化膜的均匀性, 且氧化膜中的Fe、Ni含量远低于基体.
The high temperature oxidation resistance of HK40 alloys with different amount of Al in Ar atmosphere was investigated. The surface morphology and the phases in the oxide scale were analyzed using SEM and XRD, respectively. Experimental results indicated that after Al addition the formed Al2O3 scale on the alloy surface at high temperature was uniform, consequently improved the alloy oxidation resistance. The optimum high-temperature oxidation resistance was achieved with the addition of 6 mass% Al. The oxidation mass gains of the alloy complied with a parabolic law at 1100℃, and oxidation resistance of the allotys was significantly improved with the increase of aluminum content. At high temperature, the formed oxide scales consisted of Cr2O3, CrMn1.5O4, MnCr2O4 and Al2O3, and the amount of Al2O3 in oxide scales increased with the increase of aluminum content, while the presence of aluminum improved the surface homogeneity of oxide scale, and the content of Fe, Ni elements of the oxide scale is much lower than that of the alloys.
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