工業用純チタン継目無管の特性に与える製造条件の影響

概要

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The properties of the commercially pure titanium seamless pipe, manufactured by the inclined rolling process, was investigated in comparison with the pipe by the conventional hot extrusion process. The results were as follows. (1) The titanium pipe without surface defects was successfully manufactured by the inclined rolling process. The pipe, reheated and finish rolled in the alpha phase temperature, had a good surface properties and equiaxed structure after annealing heat treatment. (2) Post annealed tensile properties of the rolled pipes satisfied the ASTM specification regardless of the reheating temperatures. The tensile properties of the rolled pipes, which were reheated in alpha phase region, were almost equivalent to that of the extruded pipe. (3) Texture formed in the rolled pipe was similar to that of formed in the rolled plate when the pipes were reheated and finish rolled in alpha phase region. On the other hand, the texture in the rolled pipes which were reheated and finish rolled in beta phase region was transformed type. The (0002) reflection was strongly accumulated in the extrusion and the transverse directions in the extruded pipe. (4) Longitudinal strength of rolled pipe, reheated and finish rolled in beta phase region, was higher than that of the pipes reheated in alpha phase region, due to the accumulation of (0002) direction along rolling direction.
1998-04-01