Oxidation behavior of Fe-Ni-Co based superalloys and influence of yttrium addition

J Mater Sci Technol ›› 2000, Vol. 16 ›› Issue (05): 509-513.

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Oxidation behavior of Fe-Ni-Co based superalloys and influence of yttrium addition

Jiansheng WU, Laming ZHANG, Junbiao ZHOU, Yin XU, Shaowei ZHANG

Open Laboratory for High Temperature Materials and Testing, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China...

Received:1999-07-12 Revised:1999-09-20 Online:2000-09-28 Published:2009-10-10
Contact: Jiansheng WU

Abstract

Abstract: The oxidation behavior of three Fe-Co-Ni based superalloys with different yttrium additions were investigated at 650 degrees C in air. The oxidation kinetics of the three alloys follows parabolic law initially, then follows linear law. The oxide scale formed on all three alloys consists mainly of Co dissolved Fe3O4 and partly of FeO and Fe2O3 in which Fe3O4 acts as a protective layer. An yttrium addition into the Fe-Co-Ni based superalloys improves their oxidation resistance by reducing the micro-defects in the scales. Thus, the weight gains of the alloys during the oxidation are reduced, and the transition of parabolic law to linear law is postponed. Pegging was observed on the cross section of alloy with 0.08 wt pet yttrium addition after the oxidation.

Key words:

Jiansheng WU, Laming ZHANG, Junbiao ZHOU, Yin XU, Shaowei ZHANG. Oxidation behavior of Fe-Ni-Co based superalloys and influence of yttrium addition[J]. J Mater Sci Technol, 2000, 16(05): 509-513.

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Oxidation behavior of Fe-Ni-Co based superalloys and influence of yttrium addition

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