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首页 > 过刊浏览>2019年第42卷第2期 >81-92. DOI:10.11835/j.issn.1000-582X.2019.02.009
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Si、V对Fe-Al-Cr合金抗高温氧化性的影响
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TG13


Effect of Si and V on high-temperature oxidation resistance of Fe-Al-Cr alloys
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    摘要:

    本文通过900℃ 10 h高温氧化实验测试添加不同合金元素（Si、V）的Fe-Al-Cr系高铝钢的抗高温氧化性。经测试，Fe-Al-Cr-Si的抗高温氧化性优于Fe-Al-Cr与Fe-Al-Cr-V合金。实验发现Fe-Al-Cr合金在高温环境下经历氧化物生成-脱落-基体氧化的动态过程，其抗高温氧化性主要取决于Fe/Al2O3界面的结合强度，而不是与铝含量呈正相关。通过密度泛函理论计算合金元素对金属/氧化物界面结合能的影响，解释了Si、V对Fe-Al-Cr系合金耐高温氧化性影响的机理：Fe/Al2O3界面结合力来自Fe-O的共价作用，Si使界面结合能从-7.16eV降低至-7.41eV，使Al2O3与基体结合更加紧密，改善了合金的高温抗氧化性；V提高界面结合能至-6.06eV，使界面容易失效，导致Al2O3的脱落，破坏了合金抗高温氧化性。

    Abstract:

    In this paper, the high-temperature oxidation resistance of Fe-Al-Cr high-aluminium steel with different alloying elements (Si, V) was tested by high-temperature oxidation test at 900℃ for 10 h. The high-temperature oxidation resistance of Fe-Al-Cr-Si was better than that of Fe-Al-Cr and Fe-Al-Cr-V alloys. Experiments revealed that the dynamic process of oxide formation, shedding and matrix oxidation occurs in Fe-Al-Cr alloy in a high-temperature environment. The high-temperature oxidation resistance of Fe-Al-Cr alloy mainly depends on the bonding strength of Fe/Al2O3 interface, rather than the positive correlation with the content of Al. The effect of alloying elements on interfacial bonding energy of metal/oxide was calculated by density functional theory. The mechanism of the effect of Si and V on high-temperature oxidation resistance of Fe-Al-Cr alloys was explained. The interfacial bonding force of Fe/Al2O3 comes from the covalent effect of Fe-O, and Si can reduce the interfacial bonding energy from-7.16 eV to -7.41 eV, which makes the bonding between Al2O3 and matrix more closely. V can increase the interfacial bonding energy to -6.06 eV, which will make the interface easy to fail, lead to the fall off of Al2O3, and destroy the high temperature oxidation resistance of the alloy.

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王锦涛,韩校宇,刘守平,侯微. Si、V对Fe-Al-Cr合金抗高温氧化性的影响[J].重庆大学学报,2019,42(2):81-92.

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  • 收稿日期:2018-11-20
  • 在线发布日期: 2019-03-08
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