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Microstructure and Tensile Properties of Vacuum Sintered/HIP'ed Pure Titaninum Takashi OKI, Kazuhiro MATSUGI Tomei HATAYAMA, Osamu YANAGISAWA For the pure titanium sintered in vacuum at the tmperatures below and above the critical temperature,1400K,their microstructures consisted of equiaxed and irregularly shaped grains, respectively. The tensile ductility, measured as the reduction of area and as the elongation, increased with increasing sintering temperature in the tmperature range below this critical temperature. However, the ductility decreased significantly until reaching a constant level with increasing sintering temperature above this temperature. HIP of vacuum sintered titanium was carried out at the tmperatures above 1400K to get the fully densified materials. The equiaxed grain was obtained, when HIP was carried out below the α⇔β transformation temperature. The irregularly shaped grain was observed in titanium HIP'ed above the transformation temperature. Futhermore, the substructures which aligned in one direction was observed in the large equiaxed grain in the HIP'ed materials at a higher tmperature of 1373K. Higher proof stress, higher ultimate tensile stress and better tensile ductlity were obtained with an equiaxed grain structure compared with the other type of microstructures. Particularly, a large reduction of area was observed in the specimens HIP'ed below the transformation temperature. It is concluded that the HIP process at low tmperatures is effective for improvement of strength and ductility of vacuum sintered titanium. Keywords : powder metallurgy, pure titanium, cold isostatic pressing, vacuum sintering, hot isostatic pressing, sintered structure, Kossel micro-diffraction, tensile properties |
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*日本金属学会誌 第59巻 第７号（１９９５）７４６-７５３より転載
**広島大学工学部
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