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Microstructure evolution during hot and cold working process and microstructure characteristics of GH5188 superalloy
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    Abstract:

    In order to provide theoretical guidance for production process contorl and performance optimization, the microstructure evolution and heat treatment process in the production procecss of GH5188 cobalt-base superalloy were investigated by SEM, EDS and Thermo-Calc software. The result indicates that the main phases of GH5188 alloy include γ, M6C and M23C6. The 1200°C/20h could reduce segregation of as-cast microstructure. Hot-rolled microstructure have a fine grain size, and a large number of aligned carbides precipitate along rolling direction. In the cold-rolled microstructure with serious grain deformation, granular M6C was found to be predominant phase. when the annealing temperature is higher than 1170°C, secondary carbides at the grain boundaries dissolved back into γ and recrystallized grain can grow in normal way.

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[Gao Yawei, Dong Jianxin, Yao Zhihao, Zhang Maicang, Niu Yongji. Microstructure evolution during hot and cold working process and microstructure characteristics of GH5188 superalloy[J]. Rare Metal Materials and Engineering,2017,46(10):2922~2928.]
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History
  • Received:June 21,2015
  • Revised:July 27,2015
  • Adopted:September 07,2015
  • Online: December 01,2017
  • Published: