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

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Multi-step Internal Nitriding of Tungsten-titanium Alloys

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

Internally nitrided dilute W-Ti alloy specimens having a heavily deformed surface microstructure were prepared by a multi-step internal nitriding at 1573-2073 K. Primary nitriding below their recrystallization temperature induced a precipitation of ultrafine TiN particles. After secondary and tertiary nitriding, those precipitates grew into rod-like TiN with a length of 20-60 nm. The recrystallization temperature after nitriding was elevated above 2073 K. The yield strength at 1773 K obtained from nitrided W-0.5 mass% Ti alloy was about 5 times as large as that of the recrystallized specimen. DBTT of the nitrided alloys was about 373 K.

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