13 research outputs found
Effect of Thermomechanical Treatment on the Microstructure and Mechanical Properties of an IF Steel
Transition and Marginalization: Locating Spaces for Discursive Contestation in Post-Revolution Tunisia
Does peer pressure and sensation seeking differentially influence substance use for male versus female trauma-exposed youth?
Microstructural Evolution and Recrystallization Kinetics of a Cold-Rolled, Ferrite-Martensite Structure During Intercritical Annealing
Development of In Vitro Matured/In Vitro Fertilized Bovine Oocytes In A Simple Defined (KSOM) Medium.
Nonlinear State Estimation and Model Predictive Control of Nitrogen Purification Columns
Microstructure and Property Modifications of Cold Rolled IF Steel by Local Laser Annealing
Laser annealing experiments are performed on cold rolled IF steel whereby highly localized microstructure and property modification are achieved. The microstructure is seen to develop by strongly heterogeneous recrystallization to provide steep gradients, across the submillimeter scale, of grain size and crystallographic texture. Hardness mapping by microindentation is used to reveal the corresponding gradients in macroscopic properties. A 2D level set model of the microstructure development is established as a tool to further optimize the method and to investigate, for example, the development of grain size variations due to the strong and transient thermal gradient. Particular focus is given to the evolution of the beneficial γ-fiber texture during laser annealing. The simulations indicate that the influence of selective growth based on anisotropic grain boundary properties only has a minor effect on texture evolution compared to heterogeneous stored energy, temperature variations, and nucleation conditions. It is also shown that although the α-fiber has an initial frequency advantage, the higher probability of γ-nucleation, in combination with a higher stored energy driving force in this fiber, promotes a stronger presence of the γ-fiber as also observed in experiments