|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||Processing Materials for Properties
||The Role of Microtexture on Fatigue Lifetime Variability and Crack Initiation Mechanisms
||Christopher Szczepanski, James Larsen, Lee Semiatin
|On-Site Speaker (Planned)
Microtexture is known to affect the fatigue behavior of alpha + beta titanium alloys as numerous studies have cited microtextured regions as the fatigue crack initiation sites. To quantify the effect of microtexture on the fatigue behavior of alpha + beta titanium alloys, three different microstructural conditions of TI-6Al-4V have been produced via distinct thermomechanical processing routes: a duplex microstructure containing microtexture, a beta annealed structure containing microtexture and a duplex microstructure free of microtexture. The impact of sample orientation on fatigue behavior was examined by testing specimens along three different orientations relative to the original plate reference frame; RD, TD, and 45° from the RD. The mechanism of fatigue crack initiation will be discussed with regard to microstructural condition (processing history) and sample orientation. Furthermore, the distributions of fatigue lifetimes will be characterized based on processing condition to determine if the presence of microtexture significantly impacts fatigue lifetime variability.
||Definite: A CD-only volume