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Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior
Chang, Jianxiu1; Feng, Wenhao1; Zhao, Wenwen1; Jia, Hongmin1; Liu, Yanming1; Luo, Sheji1; Wang, Dong2; Dong, Jiasheng2
Corresponding AuthorChang, Jianxiu()
2021-11-01
Source PublicationCRYSTALS
Volume11Issue:11Pages:15
AbstractThe relative content of strengthening element tantalum (Ta) and oxidation-resistant element chromium (Cr) is an essential value for superalloys to obtain an excellent combination of oxidation resistance and mechanical properties. In the present paper, the isothermal oxidation behavior of several single crystal Ni-base superalloys with different Ta/Cr (wt. %, similarly hereinafter) ratios at 1000 & DEG;C in static air has been systematically investigated to explore the optimal Ta/Cr for excellent oxidation resistance. A detailed microstructure study using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and an electro-probe microanalyzer (EPMA) was performed to reveal the oxidation products and mechanisms. For all alloys, a three-layer structured scale consisting of an outer (Cr, Al, Ti, Ni, Ta)-O layer, an inner Al2O3 layer and an inner nitride layer was formed. As Ta/Cr increased, the amounts of Ta-containing products, cracks, holes and inner nitride increased. Meanwhile, the completeness of the Al2O3 layer got worse. It was shown that if Ta/Cr & LE; 0.5, Ta increased the growth rate of Cr2O3 via the doping effect induced by Ta cations. If Ta/Cr > 0.5, Ta reduced the completeness of Cr2O3 through competitive growth of Ta2O5 and Cr2O3. A good oxidation performance can be expected with the value Ta/Cr & LE; 0.5.
Keywordsuperalloy high-temperature oxidation tantalum oxide
Funding OrganizationNational Natural Science Foundation of China ; National Science and Technology Major Project ; National Science Foundation of Shaanxi Province of China
DOI10.3390/cryst11111421
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51901179] ; National Science and Technology Major Project[2017-VI-0019-0091] ; National Science Foundation of Shaanxi Province of China[2018JQ5198]
WOS Research AreaCrystallography ; Materials Science
WOS SubjectCrystallography ; Materials Science, Multidisciplinary
WOS IDWOS:000723789300001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167494
Collection中国科学院金属研究所
Corresponding AuthorChang, Jianxiu
Affiliation1.Xian Shiyou Univ, Coll Mat Sci & Engn, Xian 710065, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Superalloys Div, 72 Wenhua Rd, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Chang, Jianxiu,Feng, Wenhao,Zhao, Wenwen,et al. Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior[J]. CRYSTALS,2021,11(11):15.
APA Chang, Jianxiu.,Feng, Wenhao.,Zhao, Wenwen.,Jia, Hongmin.,Liu, Yanming.,...&Dong, Jiasheng.(2021).Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior.CRYSTALS,11(11),15.
MLA Chang, Jianxiu,et al."Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior".CRYSTALS 11.11(2021):15.
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