Influence of Ta content on hot corrosion behaviour of a directionally solidified nickel base superalloy

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	Influence of Ta content on hot corrosion behaviour of a directionally solidified nickel base superalloy
	F. F. Han; J. X. Chang; H. Li; L. H. Lou; J. Zhang
	2015
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	619 页码:102-108
摘要	Hot corrosion behaviour of a directionally solidified nickel base superalloy with different tantalum (Ta) addition in fused sodium sulphate (Na2SO4) under an oxidizing atmosphere at 900 C has been studied. It was shown that the hot corrosion resistance was improved by increasing of Ta content. The hot corrosion kinetics of the alloy with lower Ta content deviated from parabolic law after 60 h corrosion test, whereas the corrosion kinetics of the alloy with high Ta content followed the parabolic law before 60 h and with less mass change afterwards. A detailed microstructure study using scanning electron microscopy (SEM) equipped with an energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray diffraction (XRD) was performed to investigate the corrosion products and mechanisms. The beneficial effect of Ta was found to be resulted from a Ta-enriched (Cr, Ti)TaO4 layer inside the corrosion scale, which led to the retarding of the element diffusion so as to decrease the hot corrosion kinetics. (C) 2014 Elsevier B.V. All rights reserved.
部门归属	[han, f. f. ; chang, j. x. ; li, h. ; lou, l. h. ; zhang, j.] chinese acad sci, inst met res, superalloy div, shenyang 110016, peoples r china. [zhang, j.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; chang, jx (reprint author), chinese acad sci, inst met res, superalloy div, 72 wenhua rd, shenyang 110016, peoples r china. ; jxchang11s@imr.ac.cn
关键词	Alloys Elements Corrosion High-temperature Corrosion Ni-based Superalloy Oxidation Tantalum Coatings Na2so4 Mechanisms Chromium Alloys Oxides
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73234
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. F. Han,J. X. Chang,H. Li,et al. Influence of Ta content on hot corrosion behaviour of a directionally solidified nickel base superalloy[J]. Journal of Alloys and Compounds,2015,619:102-108.
APA	F. F. Han,J. X. Chang,H. Li,L. H. Lou,&J. Zhang.(2015).Influence of Ta content on hot corrosion behaviour of a directionally solidified nickel base superalloy.Journal of Alloys and Compounds,619,102-108.
MLA	F. F. Han,et al."Influence of Ta content on hot corrosion behaviour of a directionally solidified nickel base superalloy".Journal of Alloys and Compounds 619(2015):102-108.