Effect of Long-term Thermal Exposure on Microstructure and Stress Rupture Properties of GH3535 Superalloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第3期
论文作者：T.Liu J.S.Dong L.Wang Z.J.Li X.T.Zhou L.H.Lou J.Zhang
文章页码：269 - 279
摘 要：The evolution of microstructure and the stress rupture properties of long term thermally exposed GH3535 alloy have been investigated. It was found that M6 C carbides presented in the solid solution heat treated samples. During long term thermal exposure at 700 C, fine M12 C carbides precipitated preferentially at grain boundaries. These carbides coexisted with the pre-exiting M6 C. The stress rupture life of700 C/1000 h exposed sample under creep testing at 650 C/324 MPa is 93 h. It is much longer than that of the solid solution samples. No noticeable changes could be detected in both the microstructure and stress rupture lives when the samples were exposed for time longer than 1000 h M12 C carbides were found to be beneficial to the creep properties. The cracks initiated at the interface of M6 C carbides and matrix, which led to a lower creep rupture life.
T.Liu1,2，J.S.Dong2，L.Wang2，Z.J.Li3，X.T.Zhou3，L.H.Lou2，J.Zhang2,4
1. School of Materials Science and Engineering, Dalian University of Technology2. Institute of Metal Research, Chinese Academy of Sciences3. Shanghai Institute of Applied Physics, Chinese Academy of Sciences4. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
摘 要：The evolution of microstructure and the stress rupture properties of long term thermally exposed GH3535 alloy have been investigated. It was found that M6 C carbides presented in the solid solution heat treated samples. During long term thermal exposure at 700 C, fine M12 C carbides precipitated preferentially at grain boundaries. These carbides coexisted with the pre-exiting M6 C. The stress rupture life of700 C/1000 h exposed sample under creep testing at 650 C/324 MPa is 93 h. It is much longer than that of the solid solution samples. No noticeable changes could be detected in both the microstructure and stress rupture lives when the samples were exposed for time longer than 1000 h M12 C carbides were found to be beneficial to the creep properties. The cracks initiated at the interface of M6 C carbides and matrix, which led to a lower creep rupture life.
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