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首页> 外文会议>International Symposium on Superalloys >Oxidation and the Effects of High Temperature Exposures on Notched Fatigue Life of an Advanced Powder Metallurgy Disk Superalloy
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Oxidation and the Effects of High Temperature Exposures on Notched Fatigue Life of an Advanced Powder Metallurgy Disk Superalloy

机译：氧化与高温暴露对先进粉末冶金盘超合金缺口疲劳寿命的影响

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Oxidation and the effects of high temperature exposures on notched fatigue life were considered for a powder metallurgy processed supersolvus heat-treated ME3 disk superalloy. The isothermal static oxidation response at 704 °C, 760 °C, and 815 °C was consistent with other chromia forming nickel-based superalloys: a TiO_2-Cr_2O_3 external oxide formed with a branched A1_2O_3 internal subscale that extended into a recrystallized y'- dissolution layer. These surface changes can potentially impact disk durability, making layer growth rates important. Growth of the external scales and y'dissolution layers followed a cubic rate law, while A1_2O_3 subscales followed a parabolic rate law. Cr- rich M_(23)C_6 carbides at the grain boundaries dissolved to help sustain Cr_2O_3 growth to depths about 12 times thicker than the scale.
机译：氧化和高温暴露对粉末冶金加工过溶血热处理的ME3磁盘超合金的氧化对脱脂寿命的影响。在704℃，760℃和815℃下的等温静氧化响应与形成镍基超合金的其他染色剂：TiO_2-CR_2O_3外部氧化物，其形成为分支的A1_2O_3内部驻留，延伸到再结晶的Y'-溶解层。这些表面变化可能会影响磁盘耐久性，使层增长率很重要。外部尺度和Y'Dissolution层的生长遵循立方率法，而A1_2O_3分量遵循抛物率法。在晶粒边界的CR-富含M_（23）C_6碳化物溶解，以帮助维持CR_2O_3的生长，深度约12倍厚度比等级厚。

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