Effect of Sn Addition on Evolution of Primary Recrystallization Texture in 3% Si Steel

摘要

The evolution of the primary recrystallization texture was investigated for 3%Si steel without and with solute Sn. The texture component just after the completion of recrystallization was {111} in both the Sn-less steel and the Sn-added steel. However, while the {111} orientation remained the main texture component in the Sn-less steel after grain growth at 850°C, the {411} orientation replaced the {111} orientation as the main texture component in the Sn-added steel. In Sn less steel, the frequency of low angle boundaries decreased during grain growth indicating the movement of low angle boundaries which are major boundaries around {111} grains. The addition of Sn selectively suppressed the decrease of the frequency of low angle during grain growth. The Monte-Carlo grain growth simulation in which the mobility of grain boundaries depended on the grain boundary misorientation angle (ω ) was conducted. The simulation results suggested that reducing mobility of low angle boundaries (ω <15°) and high angle boundaries (ω >45°) enhanced the development of {411} grains during grain growth with high angle boundaries (15i>ω <45°), which are major boundaries around {411} grains. The difference in mobility between the low angle boundaries (ω <15°) and high angle boundaries (15i>ω <45°) is caused by anisotropic solute drag effect on the grain boundaries and would result in the preferential texture evolution observed in the Sn-added steel.