|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Microbeam X-ray Laue Diffraction Analysis of a Fatigue Crack Interaction with Microstructure in Duplex Stainless Steel Using a pnCCD Detector
||Ali Abboud, Ullrich Pietsch, Hans-Juergen Christ, Jean-Sébastien Micha , Lothar Strüder, Benjamin Dögnes
|On-Site Speaker (Planned)
The effects of very high cycle fatigue damage were investigated at the level of single grains in duplex stainless steel using sub-micro-meter X-ray Laue diffraction. X-ray scans were recorded in the vicinity of a fatigue crack along its propagation direction using a 2D energy dispersive pnCCD. Correlations were made between the evolution of angular positions and energies of measured Bragg peaks; as a function of measurement position, and the arrangements of dislocations and strain. Scanning towards the crack base two regions of the real structure were distinguished: in front of the crack, the density of dislocations increases causing lattice tilts followed by formation of subgrains closer to the crack first seen as streaking and then splitting of the Bragg peaks. This process is accompanied by strain accumulation (change in the Bragg peak energy) followed by strain relaxation close to the grain boundary as a result of the formation of subgrains.
||Planned: None Selected