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純チタンのHIP過程における最終段階の焼結速度 隠岐貴史、松木一弘*、畑山東明*、柳沢 平* 真空中で予備的に焼結した純チタン材の不完全焼結体のHIP処理過程における最終段階の相対密度変化を調べた。 |
Sintering Rate in the Final Stage of HIP Process for Pure Titanium Takashi OKI, Kazuhiro MATSUGI*, Tomei HATAYAMA*and Osamu YANAGISAWA* The sintering rate in the final stage during HIP has been investigated by measurement of relative density of compacts which were preliminary sintered in vacuum. The activation energy of the final stage HIP-sintering rate Qh of 218kJ/mol and the stress exponent Nh of 4.5 are obtained for the pure titanium compact with an equiaxed structure and Qh of 213kJ/mol and Nh of 4.7 are obtained for that with a non-equiaxed structure. These values are approximately equal to the creep parameters, Qc and Nc, obtained from creep experiments. The sintering rate of the pure titanium with the equiaxed strucure is larger than that with the non-equiaxed structuire under the same condition of temperature and pressure in the HIP process, which is influenced by the structure of compacts pre-sintered in vacuum. This is mainly due to the variation of A value in the equation of power-law creep influenced by the microstructure. The control of presintered structure is important for the followed HIP process. |
*広島大学工学部 |
詳細をpdf形式にて御覧いただけます。純チタンのHIP過程における最終段階の焼結速度.pdf(264 KB) |
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