The effect of Ni and Si additions on the oxidation behaviour of Co-17Re-18Cr alloys

被引：9
作者：
Esleben, Katharina [1 ]
Gorr, Bronislava [1 ]
Christ, Hans-Juergen [1 ]
Muldierji, Debashis [2 ]
Roesler, Joachim [2 ]
机构：
[1] Univ Siegen, Inst Werkstofftech, Paul Bonatz Str 9-11, D-57068 Siegen, Germany
[2] TU Braunschweig, Inst Werkstoffe, Braunschweig, Germany
来源：
CORROSION SCIENCE | 2019年 / 159卷
关键词：
Co-Re-base alloys; SEM; XRD; High-temperature corrosion; CR; SILICON; RESISTANCE; NICKEL;
D O I：
10.1016/j.corsci.2019.108135
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：10
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