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Development of microstructure and mechanical properties of a Ni-base single-crystal superalloy by hot-isostatic pressing

  • Jung-Chel Chang
  • Cheol Choi
  • Jae-Chul Kim
  • Young-Hoon Yun
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Abstract

Effects of the hot-isostatic pressing (HIP) process on microstructures and mechanical properties of Ni-base single crystal superalloy CMSX-4 were investigated. In the overall heat treatment process, the HIP treatment remarkably induced the healing behavior of micropores and decreased the pore size and porosity of superalloy CMSX-4 compared with normally treated specimens. The microstructure of γ′ phase after the HIP process showed rather a coarsening tendency and could be developed by the partially solution and aging treatment. Consequently, the elimination of cast micropores using the HIP step resulted in the inhibition of crack initiation in microstructure and improved the stress-rupture lives of Ni-base single crystal superalloy by 185%.

Keywords

CMSX-4 healing behavior HIP treatment micropores single-crystal superalloy 

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Copyright information

© ASM International 2003

Authors and Affiliations

  • Jung-Chel Chang
    • 1
  • Cheol Choi
    • 1
  • Jae-Chul Kim
    • 1
  • Young-Hoon Yun
    • 2
  1. 1.KEPRI, Power Generation LaboratoryDaejonKorea
  2. 2.Department of Ceramic EngineeringHanyang UniversitySeoulKorea

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