High-Temperature Structural Stabilities of Ni-Based Single-Crystal Superalloys Ni-Co-Cr-Mo-W-Al-Ti-Ta with Varying Co Contents

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	High-Temperature Structural Stabilities of Ni-Based Single-Crystal Superalloys Ni-Co-Cr-Mo-W-Al-Ti-Ta with Varying Co Contents
	Zhang, Y; Wang, Q; Dong, HG; Dong, C; Zhang, HY; Sun, XF; Dong, C (reprint author), Dalian Univ Technol, Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China.
刊名	ACTA METALLURGICA SINICA-ENGLISH LETTERS
	2018-02-01
卷号	31 期号:2 页码:127-133
关键词	Low Youngs Modulus Glue-atom Model Tensile Properties Cluster Model Alloys Microstructures Transition Behavior Elements Phase
ISSN号	1006-7191
英文摘要	It has been recently pointed out that the compositions of industrial alloys are originated from cluster-plus-glueatom structure units in solid solutions. Specifically for Ni-based superalloys, after properly grouping the alloying elements into Al, Ni-like ((Ni) over bar), gamma'-forming Cr-like ((Cr) over tilde (gamma')) and gamma-forming Cr-like ((Cr) over bar (gamma)), the optimal formula for single-crystal superalloys is established [ Al-(Ni) over bar (12)](Al-1(Cr) over bar (gamma')(0.5) (Cr) over bar (gamma)(1.5)). The Co substitutions for Ni at the shell sites are conducted on the basis of the first-generation single-crystal superalloy AM3, formulated as [Al-Ni12-xCox](Al1Ti0.25Ta0.25Cr1W0.25Mo0.25), with x = 1.5, 1.75, 2 and 2.5 (the corresponding weight percents of Co are 9.43, 11.0, 12.57 and 15.71, respectively). The 900 degrees C long-term aging follows the Lifshitz-Slyozov-Wagner theory (LSW theory), and the Co content does not have noticeable influence on the coarsening rate of gamma'. The microstructure and creep behavior of the four (001) single-crystal alloys are investigated. The creep rupture lifetime is reduced as Co increases. The alloy with the lowest Co (9.43 Co) shows the longest lifetime of about 350 h at 1050 degrees C/120 MPa, and all the samples show N-type rafting after creep tests.; It has been recently pointed out that the compositions of industrial alloys are originated from cluster-plus-glueatom structure units in solid solutions. Specifically for Ni-based superalloys, after properly grouping the alloying elements into Al, Ni-like ((Ni) over bar), gamma'-forming Cr-like ((Cr) over tilde (gamma')) and gamma-forming Cr-like ((Cr) over bar (gamma)), the optimal formula for single-crystal superalloys is established [ Al-(Ni) over bar (12)](Al-1(Cr) over bar (gamma')(0.5) (Cr) over bar (gamma)(1.5)). The Co substitutions for Ni at the shell sites are conducted on the basis of the first-generation single-crystal superalloy AM3, formulated as [Al-Ni12-xCox](Al1Ti0.25Ta0.25Cr1W0.25Mo0.25), with x = 1.5, 1.75, 2 and 2.5 (the corresponding weight percents of Co are 9.43, 11.0, 12.57 and 15.71, respectively). The 900 degrees C long-term aging follows the Lifshitz-Slyozov-Wagner theory (LSW theory), and the Co content does not have noticeable influence on the coarsening rate of gamma'. The microstructure and creep behavior of the four (001) single-crystal alloys are investigated. The creep rupture lifetime is reduced as Co increases. The alloy with the lowest Co (9.43 Co) shows the longest lifetime of about 350 h at 1050 degrees C/120 MPa, and all the samples show N-type rafting after creep tests.
学科主题	Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Key Research and Development Program of China [2016YFB0701401]; National Natural Science Foundation of China [11674045]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79527]
专题	金属研究所_中国科学院金属研究所
通讯作者	Dong, C (reprint author), Dalian Univ Technol, Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, Y,Wang, Q,Dong, HG,et al. High-Temperature Structural Stabilities of Ni-Based Single-Crystal Superalloys Ni-Co-Cr-Mo-W-Al-Ti-Ta with Varying Co Contents[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2018,31(2):127-133.
APA	Zhang, Y.,Wang, Q.,Dong, HG.,Dong, C.,Zhang, HY.,...&Dong, C .(2018).High-Temperature Structural Stabilities of Ni-Based Single-Crystal Superalloys Ni-Co-Cr-Mo-W-Al-Ti-Ta with Varying Co Contents.ACTA METALLURGICA SINICA-ENGLISH LETTERS,31(2),127-133.
MLA	Zhang, Y,et al."High-Temperature Structural Stabilities of Ni-Based Single-Crystal Superalloys Ni-Co-Cr-Mo-W-Al-Ti-Ta with Varying Co Contents".ACTA METALLURGICA SINICA-ENGLISH LETTERS 31.2(2018):127-133.