A novel Re-free Ni-based single-crystal superalloy with enhanced creep resistance and microstructure stability

被引：22
|
作者：
Wei, Bensheng [1 ,2 ]
Lin, Yan [1 ,3 ]
Huang, Zaiwang [1 ,2 ]
Huang, Lan [1 ,2 ]
Zhou, Kechao [1 ,2 ]
Zhang, Longfei [1 ,2 ]
Zhang, Lijun [1 ,2 ]
机构：
[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
[2] Cent South Univ, Powder Met Res Inst, Changsha 410083, Hunan, Peoples R China
[3] Northwest Inst Nonferrous Met Res, Sate Key Lab Porous Met Mat, Xian 710016, Shanxi, Peoples R China
来源：
ACTA MATERIALIA | 2022年 / 240卷
关键词：
Ni-based single-crystal superalloys; Re-free; Os; Phase stability; Creep resistance; INTERDIFFUSION COEFFICIENTS; PHASE-EQUILIBRIA; X X; RUTHENIUM; RHENIUM; RH; TA; OS; ALLOYS; IR;
D O I：
10.1016/j.actamat.2022.118336
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Rhenium (Re) is a paramount strengthening element in nickel-based single crystal superalloys because of its low diffusion coefficient, high melting point and high partition coefficient between gamma and gamma' phases. However, its detrimental influence on phase stability has remained a long-standing problem to be solved. In this paper, we report a new design strategy to improve creep resistance and phase stability of nickel -based single crystal superalloys by replacing Re by osmium (Os), which contradicts the common belief. The experimental observations clearly show that the creep rate of newly designed CSU-Os-2 alloy is lower than that of commercial CMSX-4 alloy at 980 ?/200 MPa/100 h. Moreover, the CSU-Os-2 alloy also owns the better phase stability after exposure at 1100 ? for 1000 h, compared with CMSX-4 alloy. The striking properties can be well explained by higher partition coefficient between gamma and gamma' phases and very likely lower diffusion coefficient of Os in gamma matrix than Re. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：9
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