Surface Microstructure Evolution During Phase Transformation on Mn,Al and Si Alloyed Ultra Low Carbon Steel

摘要

This paper investigates the surface texture evolution after a short α–γ-α phasetransformation annealing in low vacuum on ultra low carbon steel sheets alloyed with high Mn andAl and the cold rolled steel sheets of industrial composition alloyed with silicon. The ultra lowcarbon steel sheets with high Mn and Al show surface monolayer which has a characteristic surfacetexture components <100>//ND texture and microstructure with special grain morphology.Contrastingly, the industrial composition alloyed with silicon does not show specific surface texturecomponents inspired by surface energy anisotropy at the surface. The composition depth profilinginvestigations performed on the all steel sheet surface shows that oxidation characteristics ofalloying elements at the metal vapour interface have played a decisive influence on surface textureevolution. Further, transformation annealing in higher vacuum reveals that surface texture can beobtained in an industrial composition alloyed with silicon.