Influence of Hold Time on Dwell Fatigue Behavior in IMI834 Disc Forging

The potential cold dwell fatigue failure in the titanium components of gas turbine engines is still a troublesome industrial issue. Based on small-scale laboratory specimens tangentially extracted from disc forging IMI834, influences period and microstructural conditions sensitivity have been investigated. fracture features deformation mechanisms were characterized using SEM, XCT TEM. EBSD was utilized to examine microtexture representative locations disc. results demonstrated that large differences IMI834 depended time crystal orientation distribution. A significant effect generated bimodal microstructure attributed intense planar slip relatively high intensity major texture component (5.95 times random level), where 120 s basically enough for reach saturation. For location with low sensitivity, extending hold would further increase debit strain accumulation, which manifested enhancing density. quantitative influence orientation, experimentally revealed, could be useful when assessing optimizing performance size parts.