Apr 20th, 1:00 PM - 4:00 PM
Exploration of Dynamic Recrystallization in Metals Using the Finite Element Modeling Program OOF2
Dynamic recrystallization (DRX) is a process of new grain nucleation and grain refinement which occurs in many metals such as aluminum, copper, and nickel when they are deformed to high strains at elevated temperatures. During DRX, new grains preferentially nucleate at triple junctions (TJs) due to a buildup of stress created by the inhibition of the grain boundary sliding (GBS). TJs containing one or more “special” low-energy boundaries are less likely to nucleate new grains, possibly because special boundaries are relatively resistant to GBS. For this project, a novel method of simulating GBS in the OOF2 finite element modeling program was developed. It has shown that GBS will redistribute stresses in a microstructure to varying degrees depending on microstructure geometry and the susceptibility of differing grain boundaries to GBS. This study is primarily a comparison of different finite element models, but it will soon be applied to the analysis of experimentally developed microstructures. This knowledge could help researchers and manufacturers predict microstructural changes that take place in some metals during processing.