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稀土元素微合金化提高HP40合金高溫抗氧化能力研究
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Study on High Temperature Oxidation Resistance of RE Modified HP40 Superalloy
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    摘要:

    通過掃描電子顯微鏡（SEM）、X光電子能譜儀（EDS）、X射線衍射儀（XRD）等手段分析了稀土元素的添加對HP40合金抗高溫氧化能力的影響。1100 ℃氧化120 h后增重最小的試樣（HP40+Y）單位面積增重約為16.24 g/m2，遠(yuǎn)低于未添加稀土元素試樣在相同條件下的氧化增重（36.45 g/m2），表明稀土元素的添加有效提高了合金的抗氧化能力。對試樣氧化膜內(nèi)部組成結(jié)構(gòu)的分析發(fā)現(xiàn)，添加稀土元素后氧化膜表面存在一層完整的尖晶石氧化物，而未添加稀土元素的試樣氧化后表層尖晶石不連續(xù)。另外，稀土元素促進(jìn)了硅的內(nèi)氧化，這種內(nèi)氧化產(chǎn)物釘扎基體，增大了氧化膜與基體的接觸面積，改善了氧化膜與基體界面的結(jié)合強度。

    Abstract:

    The effect of RE addition on the high temperature oxidation behavior of HP40 alloy was studied by SEM, EDS and XRD. The smallest mass gain of the sample with RE addition (Y addition) after 120 h oxidation at 1100 oC is 16.24 g/m2, much lower than that of the sample without RE addition (36.45 g/m2) oxidized under the same condition. The results indicate that RE can improve the high temperature oxidation resistance of HP40 alloy effectively. By analyzing the structure of the oxide scale, it can be inferred that RE addition helps to keep a continuous spinel outer layer while such layer on the sample without RE addition is discontinuous. Moreover, RE addition facilitates the formation of internal oxide, which penetrates into the matrix and increases the contact area with the matrix. As a result, it improves the scale adherence and inhibits the spallation.

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嚴(yán)靖博,高義民,梁 龍,野召忠,李燁飛,陳 威,張建軍.稀土元素微合金化提高HP40合金高溫抗氧化能力研究[J].稀有金屬材料與工程,2011,40(12):2096~2100.[Yan Jingbo, Gao Yimin, Liang Long, Ye Zhaozhong, Li Yefei, Chen Wei, Zhang Jianjun. Study on High Temperature Oxidation Resistance of RE Modified HP40 Superalloy[J]. Rare Metal Materials and Engineering,2011,40(12):2096~2100.]
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  • 收稿日期:2010-12-18
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