Effects of α plus β phase deformation on microstructure, fatigue and dwell fatigue behavior of a near alpha titanium alloy

In the present study, a near alpha titanium alloy, similar to IMI 834 alloy, was melted and thermo-mechanically processed. Different amount of deformation was imparted to the alloy in the alpha-beta region and thereafter tensile, fatigue, and dwell fatigue properties were evaluated in a standard heat treatment condition. Higher alpha-beta deformation resulted into a more refined microstructure. Further, based on EBSD analysis, it was found that higher alpha-beta deformation led to a higher fatigue and dwell fatigue life, along with dwell fatigue life debit as compared to relatively lesser deformed specimen mainly due to hard (0001) basal pole orientations, approximately, parallel to the loading axis. (C) 2016 Elsevier Ltd. All rights reserved.