Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Preparation of TZM Alloys Having Elongated Coarse-grain Structure with High Aspect Ratio and their Mechanical Properties

  • Toyosima, Gouhei (Graduate School of Environmental Science, Okayama University) ;
  • Nagae, Masahiro (Graduate School of Environmental Science, Okayama University) ;
  • Yoshio, Tetsuo (Graduate School of Environmental Science, Okayama University) ;
  • Takada, Jun (Graduate School of Natural Science and Technology, Okayama University) ;
  • Hiraoka, Yutaka (Department of Applied Physics, Okayama University of Science) ;
  • Takida, Tomohiro (A.L.M.T. TECH Inc)
  • Published : 2006.09.24
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Abstract

TZM alloy having elongated coarse-grain structure was developed by three-step internal nitriding treatment at 1423 to 1873 K in $N_2$ and subsequent recrystallization treatment at 2173 K in vacuum. Some specimens were subjected to re-nitriding treatment at 1873 K for 16 h. After the recrystallization treatment, aspect ratio (L/W) of grains for rolling direction was about 50 at the maximum. Yield stress obtained at 1773 K after re-nitriding treatment was about 6 times as large as that of recrystallized specimen. Re-nitriding was very effective in the improvement in strength of TZM alloy having elongated coarse-grain structure.

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