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Microstructure of Co-base superalloy prepared by a investment casting

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2017, 27(6), pp.313-318
  • DOI : 10.6111/JKCGCT.2017.27.6.313
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Published : December 31, 2017

Jung-Il Lee 1 LeeHoJun 1 Hyun Su Cho 1 Jong Min Paeng 1 Jong Bum Park 1 Jeong-ho Ryu 1

1한국교통대학교

Accredited

ABSTRACT

The microstructure of a cobalt-base superalloy (ECY768) obtained by an investment casting process was studied. This work focuses on the resulting microstructures arising from different melt and mold temperatures in normal industrial environmental conditions. The characterization of the samples was carried out using optical microscopy, field emission scanning electron microscopy and energy-dispersive spectroscopy. In this study, the as-cast microstructure is an α-Co (facecentered cubic) dendritic matrix with the presence of a secondary phase, such as M23C6-type carbides precipitated at grain boundaries. These precipitates are the main strengthening mechanism in this type of alloy. Other minority phases, such as the MC-type phase, was also detected and their presence could be linked to the manufacturing process and environment.

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