The effect of Ni and Si additions on the oxidation behaviour of Co-17Re-18Cr alloys
The effect of Ni and Si additions on the oxidation behaviour of Co-17Re-18Cr alloys
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DOI：
10.1016/j.corsci.2019.108135
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发表时间：
2019-10-01
影响因子：
8.3
通讯作者：
Roesler, Joachim
中科院分区：
文献类型：
--
作者：
Esleben, Katharina;Gorr, Bronislava;Roesler, Joachim
本研究研究了三种 Co-17Re-18Cr-XNi (X = 8、15、25 at.%) 合金和一种 Co-17Re-18Cr-15Ni-2Si 合金在 800°C-1100°C 温度范围内的氧化行为。实验结果表明，随着 Ni 浓度的增加，抗氧化性提高。 Ni似乎增强了Cr的扩散。然而，较高的镍浓度会加速富铬西格玛相的形成，从而从基体中减少大量的铬，并降低耐腐蚀性。氧化测试结果表明，Si 对 900 摄氏度至 1100 摄氏度的氧化行为具有积极影响。同时发现，Si 增强了 Cr 活性，促进了 σ 相的形成。
The present study deals with the oxidation behaviour of three Co-17Re-18Cr-XNi (X = 8, 15, 25 at.%) alloys and one Co-17Re-18Cr-15Ni-2Si alloy in the temperature range 800 degrees C-1100 degrees C. The experimental results reveal improved oxidation resistance with increasing Ni concentration. It seems that Ni enhances the diffusion of Cr. However, higher Ni concentrations accelerate the formation of the Cr-rich sigma phase detracting significant amounts of Cr from the matrix and deteriorating the corrosion resistance. Results of the oxidation tests reveal a positive effect of Si on the oxidation behaviour at 900 degrees C-1100 degrees C. It was found that Si enhances the Cr activity, though, facilitating the formation of the sigma phase.