Bridging simulations and experiments in microstructure evolution: modeling of microstructural evolution and texture development

A.D. (Tony) Rollett, Materials Science & Engineering Department, Carnegie Mellon University, Pittsburgh, PA 15213

Recrystallization kinetics were studied in hot rolled 1050 and 5005 with the objective of understanding the local variation in the rate of recrystallization as a function of texture component. The overall objective is to decrease annealing times by exploiting such variations. Automated electron back-scatter diffraction (EBSD, or OIM) was used to quantify microstructures at various stages of recrystallization. Analysis of the grain orientation spread (GOS) was found to be the most effective method for partitioning EBSD maps into recrystallized and unrecrystallized regions. The cube component is weak in the as-deformed state but increases to between 25% and 40%, depending on annealing temperature. Significant differences between the as-deformed texture and the texture of newly formed grains (recrystallization nuclei) demonstrate the importance of oriented nucleation in this material. Nuclei are observed at or close to boundaries between deformed cube-oriented grains and the S texture component. This latter finding meant that the original hypothesis that recrystallization kinetics could be measured as a function of deformation component was unrealistic. Instead, misorientation relationships between recrystallized and deformed grains had to be considered in detail.

Back to Seminar Home Page

Last modified 26-September-2005 by website owner: NCNR (attn: )