Abstract
Accumulative roll-bonding (ARB) is one of the severe plastic deformation techniques, using rolling. In this study, the dependence of sheet direction on the fatigue properties in commercially pure Ti sheets ARB processed by 6-cycle was investigated. In the fatigue tests, the two kinds of the loading directions were used: parallel and perpendicular to the rolling direction of the ARB processed sheet. The ARB processed sheet consists of the equiaxed and elongated grains, and the mean grain sizes were 131 nm and 95 nm, respectively. Texture becomes stronger with increasing ARB cycle. In the ARB processed Ti sheets with texture, the fatigue crack initiation life depends on the sheet direction. This dependence can be explained by the slip and twin activities.
