Effects of microstructure on the creep properties of a new Ni-Co base superalloy

Effects of microstructure on the creep properties of a new Ni-Co base superalloy
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显微组织对新型镍钴基高温合金蠕变性能的影响

DOI:
10.1016/j.msea.2016.09.060
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发表时间:
2016-12
期刊:
Materials Science and Engineering: A
影响因子:
--
通讯作者:
C. Zhang
C. Zhang
中科院分区:
其他
文献类型:
--
作者:
L. Xu;C.Q. Sun;C.Y. Cui;C. Zhang

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研究了一种新型Ni-Co基高温合金的显微组织对蠕变行为的影响。结果表明:空冷组织由大球形γ′和小球形γ′组成,蠕变速率慢,蠕变应变小;而由大的花状γ′和小的球状γ′组成的慢冷组织导致蠕变速率快和蠕变应变大。γ通道和γ′形貌是造成这种差异的两个主要因素,缓冷组织中粗大的γ通道和花状的γ′使位错在低应力下容易在γ基体中滑移并切入γ′相。
The effects of microstructure on the creep behavior in a new developed Ni-Co base superalloy were investigated and two microstructures were obtained by different heat treatments. The results show that the air cooling microstructure, consisting of large spherical γ′ and small spherical γ′, resulted in a slow creep rate and small creep strain. While the slow cooling microstructure, consisting of large flowery γ′ and small spherical γ′, resulted in a fast creep rate and large creep strain. The γ channel and γ′ morphology are two main factors for these differences, the large γ channel and flowery γ′ in the slow cooling microstructure causing the dislocations slip easily in the γ matrix and cut into the γ′ precipitates with low stress.
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