Accessible Requires Authentication Published by De Gruyter August 30, 2018

Precipitation characteristics of a nickel-based single-crystal superalloy after long-term thermal exposure

Ming Huang, Xinye Yang, Weiwei Liu, Jiarong Li, Sen Yang and Yuan Qin

Abstract

Microstructural stability is of great importance for the application of rhenium-containing nickel-based single-crystal superalloys. The microstructures of single-crystal superalloy DD6, especially the precipitation characteristics before and after thermal exposure, were characterized using scanning electron microscopy, transmission electron microscopy, and related techniques. Acicular M6C carbides, rod-like M6C carbides, and granular μ phases have been observed in the aged alloys, and the orientation relationships of these precipitates have been identified. During the early stage of M6C precipitation, the carbide maintains a cube-on-cube orientation relationship with the matrix, whereas further growth of the M6C carbides leads to a twin-related orientation relationship. For the granular μ phases containing a high concentration of Re, no special relationship has been observed. The results of the study will be beneficial for the understanding and improvement of nickel-based single-crystal superalloys.


*Correspondence address, Dr. Yuan Qin, School of Materials Science and Engineering, MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, Nanjing University of Science and Technology, No. 200 Xiaolingwei Street, Nanjing 210094, P. R. China, Tel.: +8113914776682, E-mail:

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Received: 2017-12-19
Accepted: 2018-03-27
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München