Precipitation Behavior of Wrought Fe-Ni-Based Alloy HR6W

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  • Iwamaru Arata
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Hisazawa Hiromu
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • Terada Yoshihiro
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

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  • 鍛造Fe-Ni基合金HR6Wにおける時効析出挙動
  • タンゾウ Fe-Niキ ゴウキン HR6W ニ オケル ジコウ セキシュツ キョドウ

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Abstract

<p>Age-hardening behavior of Fe-Ni-based alloy HR6W was investigated at the temperature range between 973 K and 1073 K. Two-step increase in hardness is detected for the alloy at each temperature; the first increase in hardness results from the precipitation of M23C6 phase and the second one corresponds to that of Laves phase. The TTP (time-temperature precipitation) diagram for the alloy is established based on the results of hardness measurement and microstructure observation, where the precipitation of Laves phase is slower than that of M23C6 phase by three orders of magnitude and the nose temperature of Laves phase is above 1073 K. The M23C6 phase precipitates with plate-like morphology along grain-boundaries at the early stage of aging, followed by the precipitation of Laves phase with granular morphology with increasing aging time. It is found that the M23C6 and Laves phases are aligned under stress condition, due to their precipitation on the dislocations introduced during creep deformation.</p>

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