Acta Metallurgica Sinica (English Letters)

, Volume 32, Issue 5, pp 651–658 | Cite as

Effect of Aging Heat Treatment on the Microstructure and Creep Properties of the Cast Ni-Based Superalloy at Low Temperature

  • Xiang-Wei Li
  • Li Wang
  • Xin-Gang Liu
  • Yao Wang
  • Jia-Sheng DongEmail author
  • Lang-Hong Lou


Effect of aging heat treatment on the grain boundary microstructure and creep properties of a cast Ni-based superalloy was investigated. With increasing aging temperature from 750 to 1000 °C, M23C6 carbides along the grain boundaries evolve from fine distributed block, continuous film into the coarse discrete block. Moreover, the M23C6 carbides are mainly enveloped within γ′ layers along grain boundaries during 1000 °C aging. Creep rupture lifetime and elongation at 760 °C and 645 MPa are improved with increasing the aging temperature. In particular, the creep rupture lifetime of the specimens aging at 1000 °C is one order of magnitude higher than that of the specimens aging at 750 °C. The enhancement of ductility induced by the γ′ envelopes plays a significant role in the improvement of creep rupture lifetime.


Superalloys Creep Grain boundary Carbides Aging heat treatment 



The work was financially supported by the National Key Research and Development Program of China (No. 2016YFB0701403) and the National Natural Science Foundation of China (Nos. 51701220, 51631008, 51671196 and 51871210).


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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiang-Wei Li
    • 1
    • 2
  • Li Wang
    • 1
  • Xin-Gang Liu
    • 1
  • Yao Wang
    • 1
  • Jia-Sheng Dong
    • 1
    Email author
  • Lang-Hong Lou
    • 1
  1. 1.Superalloys Division, Institute of Metal ResearchChinese Academy of SciencesShenyangChina
  2. 2.School of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefeiChina

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