Precipitation Mode and Kinetics of Fe<sub>2</sub>X (X: Ta, Hf) Laves Phase on a Eutectoid Type Reaction in High Chromium Ferritic Alloys

DOI Web Site 参考文献15件
  • Yuan Zhetao
    Department of Materials Science & Technology, Tokyo Institute of Technology
  • Perrut Mikael
    Department of Materials and Structures, ONERA - The French Aerospace Lab
  • Kobayashi Satoru
    Department of Materials Science & Technology, Tokyo Institute of Technology

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<p>We recently found the formation of periodically arrayed rows of very fine Fe2Hf Laves phase by interphase precipitation on a eutectoid type reaction path: δ-Fe → γ-Fe+Laves in 9Cr ferritic alloys with a small addition of Hf. In the present work, the precipitate morphology and precipitation mode of Laves phase were investigated on the eutectoid path in Hf or Ta doped high Cr ferritic alloys. The precipitation mode was found to change from fibrous precipitation to interphase precipitation with raising the δ→ γ transformation kinetics. The transition would be related to the time availability for solute diffusion to grow the fibrous precipitates through the advancing interface boundary diffusion. The nucleation of interphase precipitation of Fe2Hf phase was measured to be ~2 orders of magnitude faster than that of Fe2Ta. A thermodynamical consideration suggests that the faster kinetics of the Fe2Hf phase mainly derived from the higher chemical driving force for the nucleation.</p>

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