|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||Effect of Thermal and Mechanical Loadings on the Residual Strain Field in a Shot-peened Nickel Based Superalloy Investigated Using the Synchrotron X-ray Microdiffraction Technique
||Gader Altinkurt, Mathieu Fèvre, Guillaume Geandier, Odile Robach, Moukrane Dehmas
|On-Site Speaker (Planned)
Shot-peening is used to delay crack initiation in the surface layer of mechanical components by introducing compressive residual stresses and plastic deformation. During service, turbine discs of aircraft engines are subjected to complex thermal and mechanical loadings and stress relaxations take place. In polycrystalline superalloys, elastic stresses are commonly determined at the millimetre scale with conventional techniques. However, a complete understanding of the relationship between the microstructure and residual stresses is still missing. In this study, synchrotron Laue microdiffraction is employed to investigate strain fields in coarse-grained microstructures subjected to ultrasonic shot-peening and then to fatigue testing. Measurements at the micrometer scale show that after shot-peening, residual strains take place at depths larger than 1mm. After fatigue, strain redistributions are clearly visible and the dependence with the distance from the shot-peened surface initially observed disappears leaving to heterogeneous fields strongly connected to the underlying microstructure.
||Planned: Supplemental Proceedings volume