Study of the microstructure of a cold rolled interstitial free steel through X-Ray Diffraction and Electron Back- Scatter Diffraction

SCHELL, NORBERT; DE VINCENTIS, N.S.; BOLMARO, R.E.; AVALOS, M.C.; BROKMEIER, H-G.; BENATTI, E.A.

St George, Utah

Conferencia; 18th International Conference on Textures of Materials (ICOTOM-18); 2017

Brigham Young University

Hot and cold rolling are used for large-scale industrial processes, andcan produce a rather complex intermixing of grain refinement,dislocation arrays and stacking faults, distorting the crystallographiclattice and interfering with the motion of other defects. X-RayDiffraction (XRD) allows a global characterization of themicrostructure, through the analysis of the height and shape of thediffraction peaks. Moreover, synchrotron XRD enables such analysisin relation with the sample orientation. Electron Back ScatterDiffraction (EBSD) studies, on the other hand, allows a more directalthough local kind of study. In this work we use XRD to determinethe texture of an Interstitial Free Steel, cold rolled to 70 % reduction,and relate the measured texture with the defect storage on differenttexture components through diffraction peak broadening analysis.To that end we create Generalized Pole Figures (GPF) of Full WidthHalf Maximum (FWHM), and use the pole figure to ODF inversionmethod in the FWHM GPFs to find a generalized OrientationDistribution Function (ODF) which can be compared with the regularODF used in texture analysis. Finally, we compare these results withEBSD measurements of the same sample to obtain a more directestimation of the anisotropy of the defect storage of the sample. Wefound that the gamma fiber, usually present in rolled BCC materialsis the component which tend to store more defects, although X-Raydiffraction methods fail to distinguish which kind of defects are theones being stored. The typical alpha fiber was also found but it wasrather cleaner from defects. Both results are in agreement withprevious literature results for similar materials.