|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||3D Characterization of the Propagation of Physically Small Fatigue Cracks in Forged High Strength Steels
||Pablo Lorenzino, Catherine Verdu, Jean-Yves Buffiere
|On-Site Speaker (Planned)
The influence of forging conditions on the 3D crack propagation behavior of physically small fatigue cracks has been studied for two low alloy high strength steels. Two surface conditions were produced after the forging process. Small samples of 0.8 x 0.8 mm cross-sectional area were extracted from the original specimens and a 100 μm wide x 40 μm deep artificial defect produced by laser machining was introduced in the forging skin in order to act as the initiation point of the fatigue cracks.
High resolution synchrotron X-ray tomography has been used to obtain 3D images of the initiation and growth of those physically small fatigue cracks. It was found that the presence of a shot-blasted skin containing a hardness and microstructure-size gradient influences 3D crack shape during propagation in comparison with those materials without material properties gradient.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)