Comparing the intergranular oxidation of Ni-Cr and Ni-Al model alloys in 480 °C hydrogenated steam

被引：6

作者：

Ghaffari, Y. ^{[1
]}

Daub, K. ^{[1
]}

Long, F. ^{[1
]}

Topping, M. ^{[1
]}

Persaud, S. Y. ^{[1
]}

机构：

[1] Queens Univ, Dept Mech & Mat Engn, 99 Univ Ave, Kingston, ON K7L 3N6, Canada

来源：

SCRIPTA MATERIALIA | 2023年 / 232卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Ni-Cr; Ni-Al; Internal oxidation; Intergranular oxidation; Grain boundary misorientation; GRAIN-BOUNDARY MISORIENTATION; HIGH-TEMPERATURE; INTERNAL OXIDATION; SELECTIVE OXIDATION; STRESS; CORROSION; CRACKING;

D O I：

10.1016/j.scriptamat.2023.115501

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The intergranular oxidation of binary Ni-xAl (x = 4, 7 at.%) and Ni-yCr (y = 11, 15 at.%) model alloys was studied in a 480 degrees C hydrogenated steam environment. It was observed that the intergranular oxidation sus-ceptibility in Ni-Al and Ni-Cr alloys is different. In Ni-Al alloys, HAGBs are very susceptible to intergranular oxidation, while low energy grain boundaries behave similar to bulk material. In Ni-Cr alloys, LAGBs and CSLBs are susceptible to intergranular oxidation, while HAGBs are protected by an external oxide. The structure of the intergranular oxide was also different between Ni-Cr and Ni-Al alloys; the intergranular oxide formed in Ni-Al alloys was sharper and penetrated to greater depth compared with Ni-Cr alloys. Comparisons are made to previous testing of alloy 600 (Ni-16Cr-Fe) in similar environments, highlighting the potential effect of residual Al and Ti on the intergranular oxidation of the alloy.

引用

页数：6

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