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Carbides Evolution in a Ni-16Mo-7Cr Base Superalloy during Long-Term Thermal Exposure

Center for Thorium Molten Salt Reactor System, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
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Academic Editor: Mark T. Whittaker
Materials 2017, 10(5), 521; https://doi.org/10.3390/ma10050521
Received: 30 March 2017 / Revised: 8 May 2017 / Accepted: 9 May 2017 / Published: 12 May 2017
(This article belongs to the Section Structure Analysis and Characterization)
The effect of long-term thermal exposure on the carbide evolution in a Ni-16Mo-7Cr base superalloy was investigated. The results show that M12C carbides are mainly precipitated on the grain boundaries during thermal exposure, and the primary massive M6C carbides can be completely transformed to M12C carbides in situ at temperatures above 750 °C for long-term thermal exposure. The transformation from M6C carbides to M12C carbides is attributed to the release of C atoms from M6C, which results in the morphology changes of massive carbides, and stabilization of the sizes of M12C carbides precipitated on the grain boundaries. View Full-Text
Keywords: nickel base superalloy; carbide; thermal exposure; in situ transformation nickel base superalloy; carbide; thermal exposure; in situ transformation
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MDPI and ACS Style

Han, F.; Jiang, L.; Ye, X.; Lu, Y.; Li, Z.; Zhou, X. Carbides Evolution in a Ni-16Mo-7Cr Base Superalloy during Long-Term Thermal Exposure. Materials 2017, 10, 521.

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