Analysis of Grain Growth in IF Steel after Strain Annealing using EBSD

摘要

A study has been made of the grain coarsening in IF steel after strain annealing. A 92.5 percent cold rolled and annealed IF steel sheet was temper rolled by 0.4 percent reduction in thickness and subsequently annealed at 750 deg C, 850 deg C and 950 deg C for various time periods. The grains occasionally started to grow abnormally near the surface and grew into the center during strain annealing. The pole figure and EBSD measurements showed that the abnormally grown grains did not have any orientation relation with the primary recrystallization texture before temper rolling. Grains which underwent less strains due to their orientations during temper rolling are believed to grow at the expense of surrounding grains from the calculated Taylor factors. Thus, the major coarsening mechanism was regarded to be the strain induced grain boundary migration rather than grain boundary characteristics.