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EFFECTS OF Y MICROALLOYING AND (Y_2O_3-Al_2O_3) MULTI-COMPONENT COATING ON HIGH TEMPERATURE OXIDATION OF M38 SUPERALLOY |
QI Huibin; YUAN Haishun; HE Yedong; ZHU Rizhang(University of Science and Technology Beijing; Laboratory for Corrosion-Erosion and Surface Technology; Ministry of Metallurgical Industry; Beijing 100083) (Manuscript received 1995-07-15; in revised form 1995-10-30) |
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Cite this article:
QI Huibin; YUAN Haishun; HE Yedong; ZHU Rizhang(University of Science and Technology Beijing; Laboratory for Corrosion-Erosion and Surface Technology; Ministry of Metallurgical Industry; Beijing 100083) (Manuscript received 1995-07-15; in revised form 1995-10-30). EFFECTS OF Y MICROALLOYING AND (Y_2O_3-Al_2O_3) MULTI-COMPONENT COATING ON HIGH TEMPERATURE OXIDATION OF M38 SUPERALLOY. Acta Metall Sin, 1996, 32(4): 397-403.
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Abstract The effects of the multi-component (Y_2O_3-Al_2O_3) coating on the surface oxidation of the Ni-base cast superalloy M38 and Y microalloyed M38 (mass fraction of 0.04%) exposed to air at 1000℃ have been investigated. The oxidation kinetics of M38, M38+(Y_2O_3-Al_2O_3) and M38+Y+(Y_2O_3-Al_2O_3) follow the approximate parabolic law. The mass-gain of M38+Y is very rapid at the initial stage and slow after about 50 h. The sequence of mass-gains after 200 h oxidation is M38>M38+(Y_2O_3-Al_2O_3)>M38+Y+(Y_2O_3-Al_2O_3)> M38+Y. The morphology and component of the oxide scale on M38 are changed remarkably by the alloying of Y and the coating of (Y_2O_3-Al_2O_3) thin film. The grain size of oxide is fined and the selective oxidation of Cr and Al is promoted. Correspondent: HE Yedong,(professor, Corrosion and Protection Centre, University of Science and Technology Beijing, Beijing 100083)
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Received: 18 April 1996
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