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Effect of Ti and Al on microstructure and partitioning behavior of alloying elements in Ni-based powder metallurgy superalloys

  • Yin-long Shao
  • Jing Xu
  • Hao WangEmail author
  • Yi-wen Zhang
  • Jian Jia
  • Jian-tao Liu
  • Hai-liang Huang
  • Ming Zhang
  • Zhi-cheng Wang
  • Hong-fei Zhang
  • Ben-fu Hu
Article
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Abstract

The microstructure and partitioning behaviors of alloying elements in the γ and γ′ phases in Ni-based powder metallurgy superalloys with different Ti and Al contents were investigated. The results showed that Ti and Al were mainly enriched in the γ′ phase, partially partitioned in the γ matrix, and slightly distributed in the carbides. Different Ti and Al contents in various alloys influenced the composition and amount of MC carbides but did not influence the MC carbides’ morphology. With increasing Ti and Al contents, γ + γ′ fan-type structures formed at the grain boundary, eventually resulting in a coarsened γ′ phase. In addition, the morphology of the secondary γ′ phase transformed from nearly spherical to cuboidal. The saturation degrees of Cr, Co, and Mo in the γ matrix were substantially improved with increasing Ti and Al contents.

Keywords

superalloy Al Ti microstructure partitioning 

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Notes

Acknowledgements

This study was financially supported by the Guangdong Provincial Key Laboratory for Technology and Application of Metal Toughening (No. GKL201611), the National Natural Science Foundation of China (No. 51571020), and the Fundamental Research Funds for the Central Universities (No. FRF-IC-17-002).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yin-long Shao
    • 1
    • 2
  • Jing Xu
    • 1
  • Hao Wang
    • 2
    Email author
  • Yi-wen Zhang
    • 3
  • Jian Jia
    • 3
  • Jian-tao Liu
    • 3
  • Hai-liang Huang
    • 2
  • Ming Zhang
    • 2
  • Zhi-cheng Wang
    • 2
  • Hong-fei Zhang
    • 2
  • Ben-fu Hu
    • 2
  1. 1.Guangdong Provincial Key Laboratory for Technology and Application of Metal TougheningGuangdong Institute of Materials and ProcessingGuangzhouChina
  2. 2.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina
  3. 3.High Temperature Material Research InstituteCentral Iron and Steel Research InstituteBeijingChina

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