| 铁铬铝合金晶粒长大及合金中稀土元素 |
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| 引用本文： | 杜国维,杜永良,章小雁.铁铬铝合金晶粒长大及合金中稀土元素[J].北京科技大学学报,1988(3). |
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| 作者姓名： | 杜国维 杜永良 章小雁 |
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| 作者单位： | 北京钢铁学院
(杜国维)，北京钢丝厂
(杜永良)，北京钢丝厂(章小雁) |
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| 摘 要： | 研究了不同稀土含量铁铬铝合金,在高温下晶粒长大及界面结构。结果表明:在1200℃以上高温,稀土组元(以La为主)对抑制合金的晶界长大有一定效果,La_2O_3可作为TiN相析出的形核中心,细小TiN质点可在晶界上出现,阻碍晶界迁移;在变温过程中,La向界而扩散,在晶界以La_2O_3形式出现,同时稀土加速氧穿过氧化膜向基体中渗透,导致Al_2O_3及La_2O_3在基体中形成。
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| 关 键 词： | 晶界迁移 电热含金 空位扩散 空位陷井 铁铬铝合金 |
The Grain Growth of Fe-Cr-Al Alloy and the Rare Earth in Alloy |
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| Du Guowei,Du Yongliang,Chan Xiaoyan.The Grain Growth of Fe-Cr-Al Alloy and the Rare Earth in Alloy[J].Journal of University of Science and Technology Beijing,1988(3). |
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| Authors: | Du Guowei Du Yongliang Chan Xiaoyan |
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| Abstract: | The experiments have been performed to investigate the grain growth, the characterization of grain boundary migration and the interfacial phenomena at high temperature for Fe-25Cr-5Al-RE alloy. The results show that the rare earth (landium is main) has a certain effect on the grain growth of alloy; La2O3 may be the nuclear center of titanium nitride phases that precipitate in the matrix of the alloy; for Fe-Cr-Al-RE (RE<0.1%) fine titanium nitride may precipitate on the grain boundaries and inhibite the migration of grain boundaries; by repeated heating and cooling, the rare earth increases the permeation of O2- ions through the oxide scale, lanthanum atoms diffuse towards the interfaces and precipitate as lanthana. There is no doubt that the precipitates lanthana and alumina in matrix as a trapping of vacancies greatly increase the oxidation resistance and the life of the electric heating a lloy. |
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| Keywords: | grain boundary migration elcclrolllermal alloys diffusion of vacancies FcCrAl alloy trapping of vacancies |
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