Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New α+β Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo
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概要
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Variations in the microstructure and hardness with solution treating and aging conditions in new α+β titanium alloy Ti–4.5%Al–6%Nb–2%Fe–2%Mo were investigated. Solution treating (ST) temperatures were varied from 1048 to 1173 K with both cooling conditions of water quenching and air cooling. Cooling rate after solution treating was varied from 1 to 60 K/s using a hot working simulator. Age-hardening was investigated at temperatures ranged from 573 to 823 K and aging time periods were varied in the range from 0.36 to 32.4 ks. An extremely fine two-phase microstructure with α grain size of around 1 μm was obtained at ST temperature of 1048 K. The large amount of retained β phase was obtained by solution treating at temperatures below 1098 K, and the amounts of α″ martensite and athermal ω phase increased with an elevation of ST temperature above 1098 K. For solution treating with water quenching, no hardness variation with solution treating temperature was observed. Age-hardening at the temperatures above 723 K took place at an extremely short aging time. Peak-age was observed in such a short aging time period as 0.36 ks, and hardness value at peak-age increased markedly and continuously with an elevation of solution treating temperature. Age-hardening was confirmed to be caused by very fine a precipitates, and age-hardening behavior noted above was explained by athermal ω phase playing a role of a nucleus for a precipitate.
- 社団法人 日本鉄鋼協会の論文
- 2007-07-15
著者
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NARUSHIMA Takayuki
Department of Materials Processing, Tohoku University
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成島 尚之
Department Of Materials Processing Tohoku University
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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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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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Narushima Takayuki
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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Ouchi Chiaki
Department Of Metallurgy Tohoku University
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HIRANO Takahiro
Tohoku University. Now at JFE Steel Corp.
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Ouchi Chiaki
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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