On the possibility of simultaneously achieving sufficient oxidation resistance and creep property at high temperatures exceeding 1000 °C in Co-based superalloys

被引：11
作者：
Chen, Zhenghao [1 ]
Okamoto, Norihiko L. [2 ,4 ]
Chikugo, Kazuyoshi [3 ]
Inui, Haruyuki [1 ,2 ]
机构：
[1] Kyoto Univ, Ctr Elements Strategy Initiat Struct Mat ESISM, Kyoto 6068501, Japan
[2] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan
[3] IHI Corp, Technol & Intelligence Integrat, Isogo Ku, Shin Nakaharamachi 1, Yokohama, Kanagawa 2358501, Japan
[4] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 858卷
关键词：
Co-based superalloy; Creep; Oxidation resistance; Phase equilibria; Scanning electron microscopy (SEM);
D O I：
10.1016/j.jallcom.2020.157724
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Effects of additions of gamma' (L1(2))-forming elements (Ta, Ti and Ni; for creep property) and gamma (FCC)-forming elements (Cr and Si; for oxidation resistance) on the microstructural stability, oxidation resistance and creep properties of two-phase gamma/gamma' Co-based superalloys based on the Co-Al-W systems have been investigated in order to see whether simultaneous achievement of sufficient oxidation resistance and creep property for the usage above 1000 degrees C is possible or not for Co-based superalloys. A candidate composition ((Co0.8Ni0.2)-6Al-2W-2Ta-6Ti-8Cr-1Si) that provides relatively high gamma' solvus temperature and high y' volume fraction is found. The alloy with the candidate composition exhibits superior oxidation resistance when compared to Cr-free alloys but the creep property is not as good as expected from the high gamma' solvus temperature and high gamma' volume fraction and is only comparable to those of Ni-based superalloys of the first generation. The reason for the modest creep properties of the candidate alloy as well as possibilities for further investigation to simultaneously achieve sufficient oxidation resistance and creep property for Co-based superalloys are discussed. (C) 2020 Elsevier B.V. All rights reserved.
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页数：13
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