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Metallographic characterization and indentation of two commercial cobalt-based superalloys synthesized with a fine microstructure

Adrien Frig???????©rio, Pierre-Yves Girardin, Patrice Berthod


Two commercial chromium-rich cobalt-based cast superalloys belonging to the ones often considered for the hottest pieces of aero-engines were reproduced in laboratory scale by melting of pure elements under inert atmosphere and solidification of ingots of several tens grams. The as-cast microstructures were examined and specified using electron microscopy and energy dispersion spectrometry while the room temperature hardness wasmeasured byVickers indentation. The microstructures of the two alloys are especially fine and rich in carbides of several types: chromiumcarbides and MC-carbides, thanks to rather high carbon contents. Chromium, and eventually tungsten,was found in some of the coarse carbideswhile tantalum and tungsten obviously belonged to the elongated MC carbides. Titanium and zirconium, the two other MC-former elements were essentially found, in addition to Ta and W, in the blocky MC carbides existing besides the elongated ones. The Vickers macro-hardness at ambient temperature of the two alloys are all slightly higher than 400 HV.


索引于

  • 中国社会科学院
  • 谷歌学术
  • 打开 J 门
  • 中国知网(CNKI)
  • 引用因子
  • 宇宙IF
  • 米亚尔
  • 秘密搜索引擎实验室
  • 欧洲酒吧
  • 巴塞罗那大学
  • ICMJE

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