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Influences of MCrAlY coatings on oxidation resistance of single crystal superalloy DD98M and their inter-diffusion behaviors
Shi, Long; Xin, Li; Wang, Xinyue; Wang, Xiaolan; Wei, Hua; Zhu, Shenglong; Wang, Fuhui; xli@imr.ac.cn
2015
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume649Pages:515-530
AbstractOxidation and interdiffusion behaviors of Ni-based single crystal superalloy DD98M with nominal compositions Ni-5.0Co-6.0Cr-6.3Al-6.0W-2.0Mo-6.0Ta-1.0Ti (in wt.%) and two types of MCrAlY coatings at 1000 degrees C and 1050 degrees C were investigated. Complex oxides formed on the surface of DD98M alloy when oxidized at 1000 degrees C and 1050 degrees C, which stratified, cracked and spalled. The faceted-like AlN and the particle-like and strip-like TiN formed in the alloy. The application of the NiCrAlY and NiCoCrAlYHfSi coatings greatly improved the oxidation resistance of DD98M alloy. After 500 h oxidation, alpha-Al2O3 was still the dominate phase in the oxide scales formed on the coated specimens. The adhesion of the oxide scale on the NiCoCrAlYHfSi coating was much better than that on the NiCrAlY coating. Inter-diffusion occurred between the coatings and the substrate, which led to the formation of the IDZ and SRZ. The IDZ of the NiCrAlY coated specimen was composed of gamma phase and Al- and Ta-rich gamma' phase. The gamma' phase in the IDZ accommodated most of the inward diffusing aluminum, so the SRZ formation was suppressed when oxidized at 1050 degrees C. However the formation of SRZ with m-TCP still occurred when oxidized at 1000 degrees C probably due to the low solubility and slow diffusion rate of the alloying elements at lower temperature. The IDZ of the NiCoCrAlYHfSi coated specimen was a single g phase. A large amount of m-TCP precipitated in the SRZ of the NiCoCrAlYHfSi coated specimen when oxidized at 1000 degrees C and 1050 degrees C. It can be concluded coating composition has a significant effect on the development of the IDZ and SRZ. Thermal exposure temperature also has influences on the formation of the SRZ. The mechanism of SRZ formation and TCP precipitation are discussed. (C) 2015 Elsevier B.V. All rights reserved.
description.department[shi, long] northeastern univ, sch met & mat, shenyang 110819, peoples r china ; [shi, long ; xin, li ; wang, xinyue ; wang, xiaolan ; wei, hua ; zhu, shenglong ; wang, fuhui] chinese acad sci, inst met res, lab corros & protect, shenyang 110016, peoples r china
KeywordSuperalloy Vapor Deposition Oxidation Mcraly Coating Interdiffusion
Funding OrganizationNational Key Basic Research and Development Program (973 Program) [2012CB625100]; National High Technology Research and Development Program of China (863 Pro-gram) [2012AA03A512]
Indexed Bysci
Language英语
WOS IDWOS:000361159000070
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74922
Collection中国科学院金属研究所
Corresponding Authorxli@imr.ac.cn
Recommended Citation
GB/T 7714
Shi, Long,Xin, Li,Wang, Xinyue,et al. Influences of MCrAlY coatings on oxidation resistance of single crystal superalloy DD98M and their inter-diffusion behaviors[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2015,649:515-530.
APA Shi, Long.,Xin, Li.,Wang, Xinyue.,Wang, Xiaolan.,Wei, Hua.,...&xli@imr.ac.cn.(2015).Influences of MCrAlY coatings on oxidation resistance of single crystal superalloy DD98M and their inter-diffusion behaviors.JOURNAL OF ALLOYS AND COMPOUNDS,649,515-530.
MLA Shi, Long,et al."Influences of MCrAlY coatings on oxidation resistance of single crystal superalloy DD98M and their inter-diffusion behaviors".JOURNAL OF ALLOYS AND COMPOUNDS 649(2015):515-530.
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