Microstructure and Property Modifications of Cold Rolled IF Steel by Local Laser Annealing

摘要: Laser annealing experiments are performed on cold rolled IF steel whereby highly localized microstructure and property modification achieved. The is seen to develop by strongly heterogeneous recrystallization provide steep gradients, across the submillimeter scale, of grain size crystallographic texture. Hardness mapping microindentation used reveal corresponding gradients in macroscopic properties. A 2D level set model development established as a tool further optimize method investigate, for example, variations due strong transient thermal gradient. Particular focus given evolution beneficial γ-fiber texture during laser annealing. simulations indicate that influence selective growth based anisotropic boundary properties only has minor effect compared stored energy, temperature variations, nucleation conditions. It also shown although α-fiber an initial frequency advantage, higher probability γ-nucleation, combination with energy driving force this fiber, promotes stronger presence observed experiments.