Experimental studies and modeling for the transition from internal to external oxidation of three-phase Nb-Si-Cr alloys

Experimental studies and modeling for the transition from internal to external oxidation of three-phase Nb-Si-Cr alloys
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三相 Nb-Si-Cr 合金从内氧化到外氧化转变的实验研究和建模

DOI:
10.1016/j.pnsc.2018.11.005
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发表时间:
2018-12
期刊:
Progress in Natural Science: Materials International
影响因子:
--
通讯作者:
Chungen Zhou
Chungen Zhou
中科院分区:
其他
文献类型:
--
作者:
Wei Jiang;Wei Shao;Jiangbo Sha;Chungen Zhou

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本文提出了一个修正的氧化模型,该模型假定Cr2Nb相为类圆柱形,以考察三相Nb基合金氧化膜的形成条件。测试了三相Nb基合金在1250 °C下1 h和7 h的氧化行为,并将实验结果与模拟结果进行了比较。结果表明,通过提高Cr2Nb相的长径比和体积分数,可以实现CrNbO4的外尺度化。模拟结果与实验结果基本一致。
A modified oxidation model, which assumes the cylindrical-like morphology of Cr2Nb phase, has been proposed to examine the conditions to form external scale of three-phase Nb-base alloys in this paper. The oxidation behavior of three-phase Nb-base alloys was tested at 1250 °C for 1 h and 7 h, and the experimental results were compared with the simulated results. The results show that the external CrNbO4scale can be achieved by length-radius ratio and volume fraction increasing for Cr2Nb phase. The simulated results are consistent with the experimental results.
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