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首页> 外文期刊>Materials at High Temperatures >The effect of elevated air pressure on the oxidation properties of the nickel-based superalloy, RR1000, at 650 degrees C with different surface modifications
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The effect of elevated air pressure on the oxidation properties of the nickel-based superalloy, RR1000, at 650 degrees C with different surface modifications

机译:气压升高对镍基超合金,RR1000的氧化性能,在650℃下具有不同的表面修饰

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摘要

Samples of RR1000 with differing grain size and surface finish have been exposed to air at different pressures. Specimens were exposed for 4000 h at 650 degrees C with some exposed to atmospheric pressure air and some exposed to air at 40 bar pressure. Samples exposed to elevated pressure formed a surface layer of NiCr2O4 whereas that formed on samples tested at 1 bar pressure was chromia. The surface layer formed at 40 bar pressure was thinner than that a 1 bar pressure. At 1 bar pressure, some samples exhibited regions of convoluted buckled oxides but no spallation. In adjacent regions of planar oxides, spallation did occur. For the latter case, an estimate of 6 Jm(-2) for the interfacial fracture energy has been made. None of the specimens tested at 40 bar pressure exhibited oxide spallation.
机译:具有不同粒度和表面光洁度的RR1000的样品已暴露于不同压力的空气中。 在650摄氏度下暴露4000小时,将一些暴露在大气压空气中,有些在40巴压下暴露在空气中。 暴露于升高的压力的样品形成了NiCr2O4的表面层,而在在1巴压力测试的样品上形成的是染色物。 在40巴压力下形成的表面层比1巴压力薄。 在1巴的压力下,一些样品显示出旋转屈曲氧化物的区域,但没有椎间露。 在平面氧化物的相邻区域中,发生了椎间壳。 对于后一种情况,已经进行了界面骨折能量6 JM(-2)的估计。 没有在40巴的压力下测试的标本表现出氧化物介质。

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