Effects of Surface-Segregated Sulfur on Primary Texture and Surface-Energy-Induced Selective Grain Growth in Ultra-Thin 3 Silicon-Iron Alloy

摘要

Correlation between surface-segregated sulfur, nucleation, surface-energy-induced selective growth and final texture is investigated in 40μm thick 3%Si-Fe strips containing 90ppm bulk content of sulfur. At a fixed final reduction, the final texture after direct isothermal annealing is transited from {100} to {110}<001> with increasing flow rate of hydrogen. Such a dependence of final texture on flow rate of hydrogen results from the decrease in concentration of surface-segregated sulfur by the active formation of H_2S, the followed decrease in selective growth time period of {100} grains and the resultant increase in survival probability of {110}<001> grains after the selective growth of {100} grains. At a fixed flow rate of hydrogen, the change in final texture of {110} to {110}<001> with increasing heating rate is due to the lower concentration of segregated sulfur that is favorable for the nucleation of the {110}<001> Goss embryos.