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Influence of Sputtered Nanocrystalline Coating on Oxidation and Hot Corrosion of a Nickel-based Superalloy M951
X. Y. Wang; L. Xin; F. H. Wang; S. L. Zhu; H. Wei; X. L. Wang
2014
Source PublicationJournal of Materials Science & Technology
ISSN1005-0302
Volume30Issue:9Pages:867-877
AbstractThe isothermal and cyclic oxidation behaviors in air and hot corrosion behaviors in Na2SO4 + 25 wt% K2SO4 salt of M951 cast superalloy and a sputtered nanocrystalline coating of the same material were studied. Scanning electron microscopy, energy dispersive X-ray spectroscope, X-ray diffraction, and transmission electron microscopy were employed to examine the morphologies and phase composition of the M951 alloy and nanocrystalline coating before and after oxidation and hot corrosion. The as-sputtered nanocrystalline layer has a homogeneous gamma phase structure of very fine grain size (30-200 nm) with the preferential growth texture of (111) parallel to the interface. Adherent Al2O3 rich oxide scale formed on the cast M951 alloy and its sputtered coating after isothermal oxidation at 900 and 1000 degrees C. However, when being isothermal oxidized at 1100 degrees C and cyclic oxidized at 1000 degrees C, the oxide scale formed on the cast alloy was a mixture of NiO, NiAl2O4, Al2O3 and Nb2O5 and spalled seriously, while that formed on the sputtered coating mainly consisted of Al2O3 and was very adherent. Nanocrystallization promoted rapid formation of Al2O3 scale during the early stage of oxidation and enhanced the adhesion of the oxide scale, thus improved the oxidation resistance of the substrate alloy. Serious corrosion occurred for the cast alloy. The sputtered nanocrystalline coating apparently improved the hot corrosion resistance of the cast alloy in the mixed sulfate by the formation of a continuous Al2O3 and Cr2O3 mixed oxide layer on the surface of the coating, and the pre-oxidation treatment of the coating led to an even better effect.
description.department[wang, xinyue] northeastern univ, sch met & mat, shenyang 110819, peoples r china. [wang, xinyue ; xin, li ; wang, fuhui ; zhu, shenglong ; wei, hua ; wang, xiaolan] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; xin, l (reprint author), northeastern univ, sch met & mat, shenyang 110819, peoples r china. ; xli@imr.ac.cn
KeywordM951 Alloy Sputtered Nanocrystalline Coating Oxidation Corrosion Pre-oxidation High-temperature K38g Superalloy Behavior Microstructures Dependence Air
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73429
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
X. Y. Wang,L. Xin,F. H. Wang,et al. Influence of Sputtered Nanocrystalline Coating on Oxidation and Hot Corrosion of a Nickel-based Superalloy M951[J]. Journal of Materials Science & Technology,2014,30(9):867-877.
APA X. Y. Wang,L. Xin,F. H. Wang,S. L. Zhu,H. Wei,&X. L. Wang.(2014).Influence of Sputtered Nanocrystalline Coating on Oxidation and Hot Corrosion of a Nickel-based Superalloy M951.Journal of Materials Science & Technology,30(9),867-877.
MLA X. Y. Wang,et al."Influence of Sputtered Nanocrystalline Coating on Oxidation and Hot Corrosion of a Nickel-based Superalloy M951".Journal of Materials Science & Technology 30.9(2014):867-877.
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