Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)
- 2006.09b
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- Pages.1157-1158
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- 2006
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
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.
Keywords
- tungsten alloy;
- internal nitriding;
- recrystallization temperature;
- ductile-to-brittle transition temperature