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High temperature oxidation behaviour of NbC-reinforced cast superalloys

机译：NbC增强铸态高温合金的高温氧化行为

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Cast Co- and Ni-based chromia-forming alloys are an important family of superalloys for uses at elevated temperatures. These alloys are notably used for applications inducing contact with aggressive molten substances. The mechanical properties required by some applications at high temperature can be achieved by solid solution strengthening or reinforcement by hard particles such as carbides. These ones may involve carbide-forming elements which can be harmful for the oxidation behaviour. In this study, two Ni- and Co-based alloys containing NbC-carbides were tested in oxidation at 1000°C, 1100°C and 1200°C. The kinetic constants kp and kv (thermogravimetry), scale spallation (image analysis), the oxide characteristics (DRX, SEM) and the sub-surface states (SEM, EDS) were specified. The possible effect of aging (100h 1200°C) on oxidation was investigated in parallel. The results show that the kinetic constants are lower for the Ni alloy than for the Co one for all temperatures. The heat treatment speeds on the oxidation rate. The oxides formed over the Ni alloy are principally Cr_2O_3 with a few spinel NiCr_2O_4. A thicker oxide layer covers the Co alloy. It is constituted of an outer cobalt oxide layer and an inner mixture of Cr_2O_3, CoO, CoCr_2O_4 and niobium oxide. To finish, these results were compared to similar ones obtained for a Co-based alloy containing TaC (instead NbC) which presented a good oxidation resistance at high temperature.
机译：铸造钴基和镍基氧化铬形成合金是在高温下使用的重要超合金家族。这些合金特别用于引起与侵蚀性熔融物质接触的应用。某些应用在高温下所需的机械性能可以通过固溶强化或硬质颗粒（例如碳化物）的强化来实现。这些可能涉及碳化物形成元素，可能对氧化行为有害。在这项研究中，在1000°C，1100°C和1200°C的氧化条件下测试了两种含NbC碳化物的Ni和Co基合金。规定了动力学常数kp和kv（热重法），水垢剥落（图像分析），氧化物特性（DRX，SEM）和表面状态（SEM，EDS）。平行研究了老化（100h 1200°C）对氧化的可能影响。结果表明，在所有温度下，镍合金的动力学常数均低于钴一的动力学常数。热处理加快了氧化速率。在Ni合金上形成的氧化物主要是Cr_2O_3和一些尖晶石NiCr_2O_4。较厚的氧化物层覆盖了钴合金。它由氧化钴外层和Cr_2O_3，CoO，CoCr_2O_4和氧化铌的内部混合物组成。最后，将这些结果与含有TaC（而不是NbC）的Co基合金的相似结果进行了比较，后者在高温下具有良好的抗氧化性。

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