β Grain Refinement due to Small Amounts of Yttrium Addition in α+β Type Titanium Alloy, SP-700
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概要
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The effect of small amounts of yttrium addition on refinement of β grain size and grain growth behavior in SP-700 alloy with Ti–4.5%Al–3%V–2%Fe–2%Mo was investigated in the temperature region from 1223 to 1573 K. Yttrium and oxygen contents in yttrium-added alloys were varied from 0.007 to 0.070% and 0.017 to 0.086%, respectively. Such a small amount of yttrium addition as 0.007% resulted in marked β grain refinement. Variation of β grain size with the heating temperature exhibited rapid grain growth at the particular temperature, which became higher with the increase of yttrium or oxygen content in alloys. It was confirmed that β grain refinement and grain growth behavior with the heating temperature in yttrium-added alloys were brought about by fine precipitates of yttria and dissolution of these precipitates into the β matrix at the higher temperature. TEM and SEM observations of yttrium-added alloys revealed the cubic shape of yttria precipitates with the size of 0.1 to 0.2 μm, and this range of the precipitates size was well fitted to results analyzed by modified Zener model for pinning of grain boundary due to a fine particle. Based on assumption that the onset temperature of rapid grain growth corresponds to the re-dissolution temperature of yttria into the β phase, solubility product of Y2O3 in reaction of 2Y+3O↔Y2O3 was obtained in use of data of variation of the onset temperature of rapid grain growth with yttrium and oxygen contents in alloys. It was also confirmed that yttria powder could be used as an alloying additive of yttrium in melting of yttrium-added alloys.
- 社団法人 日本鉄鋼協会の論文
- 2006-01-15
著者
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NARUSHIMA Takayuki
Tohoku University Biomedical Engineering Research Organization, Tohoku University
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井口 〓孝
Department Of Materials Processing Tohoku University
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井口 泰孝
東北大学大学院工学研究科
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MURAKAMI Taichi
Department of Materials Processing, Tohoku University
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OUCHI Chiaki
Department of Materials Processing, Tohoku University
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IGUCHI Yasutaka
Department of Metallurgy, Tohoku University
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Murakami Taichi
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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Ouchi C
Department Of Materials Processing Tohoku University
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Ouchi Chiaki
Tohoku University
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Murakami Taichi
Department Of Materials Processing Tohoku University
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Murakami Taichi
Department Of Chemistry And Materials Science Tokyo Institute Of Technology
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HOTTA Satoshi
Department of Materials Processing, Graduate School of Engineering, Tohoku University
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Narushima Takayuki
Tohoku University Biomedical Engineering Research Organization (tubero) Aobayama Materials Science B
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Iguchi Yasutaka
Department Of Materials Processing Tohoku University
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Ouchi Chiaki
Department Of Metallurgy Tohoku University
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Hotta Satoshi
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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YAMADA Katumi
JFE Steel Corporation
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Ouchi Chiaki
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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