2015 年 56 巻 11 号 p. 1800-1806
This study was conducted to investigate the influence of cold rolling on the fundamental properties of the typical β titanium alloy Ti-15V-3Cr-3Sn-3Al. Hot-rolled plates of the alloy were solution-treated and then cold-rolled under a rolling reduction of 30%. Cold rolling induced work hardening, increasing the hardness and the tensile strength. The developed texture caused anisotropy of the tensile strength. The cold-rolled material showed a unique anisotropy of yield strength because the activated slip system was switched or not switched, depending on the tensile direction against the cold rolling direction. The fatigue strength was also increased by cold rolling. However, fatigue cracks were generated from crystal grains having the same orientation regardless of the cyclic loading direction against the rolling direction. As a result, no clear anisotropy was found in the fatigue strength.
