Elimination of dual slope from the Coffin-Manson relationship of low-cycle fatigue in the titanium alloy timetal 834, by cold rolling

Abstract

Cold rolling of the titanium alloy Timetal 834 was found to cause marked enhancement in low-cycle fatigue (LCF) life at low strain amplitude and to eliminate bilinear behavior from the Coffin-Manson (C-M) relationship. It was due to work hardening of surface grains of soft orientation and consequent increase in resistance of the material against crack initiation. The observed effect was not associated with texture. © The Minerals, Metal & Materials Society and ASM International 2007.