Texture formation in low carbon Ti bearing steel sheets by high speed hot rolling in ferrite region.

Abstract

The effect of inhomogeneous shear strain on the texture variation through the thickness of hot rolled low carbon (0.006% C) Ti bearing steel sheets has been investigated. The change in texture with the progress of recrystallization has been also investigated.The steel sheets were rolled in ferritic state at a rolling speed of 20m/s to the reduction of 40% with and without lubrication, and quenched into water at an interval of 3-250ms after rolling. In unlubricated rolling, shear deformation produces a severely sheared region beneath the surface. In lubricated rolling, shear strain is negligibly small throughout the thickness. ||ND axis density increases and ||ND and ||ND axis density decrease with increasing shear strain in unlubricated sheets. The texture of lubricated sheet, which is identical with that at the midthickness of the unlubricated sheet, is uniform through the thickness. Recrystallization reduces ||ND axis density at the severely sheared region and ||ND at the midthickness of the unlubricated sheet. ||ND axis density of the lubricated sheet also decreases with recrystallization. The texture inhomogeneity through the thickness of the sheet rolled without lubrication is retained after completion of recrystallization.