Effect of Coiling Temperature on Evolution of Microstructure and Texture During Annealing

According to the technical process of modified Sindzmir continuous hot-dip galvanizing lines,Gleeble-1500 annealing simulation were conducted to systematically study the effect of coiling temperature on the evolution of microstructure and recrystallization textures as well as the recrystallization temperature of a Ti-IF steel during annealing,and the means of optical microscopy,X-ray texture measurement and hardness testing were employed in the study.The steel was industrially hot rolled with different coiling temperatures and cold rolled.The results showed that the full recrystallization temperature decreases as the coiling temperature is increased.When the annealing temperature is below 880℃,the annealing temperature has little influence on the recrystallization grain size,the grain size is above ASTM grade 11.0 for low temperature coiled steel and about ASTM grade 10.5 for high temperature coiled steel.When the annealing temperature is risen to 920℃, the grain remarkably coarsens.Strong {223}<110> and {114}<110> texture components were found after annealing.Their intensity is little affected by coiling temperature and annealing process yet the intensity of {111} recrystallization texture tends to increase when the annealing temperature is increased,especially at higher annealing temperature.When the annealing temperature is further increased to 920℃,the intensity of {111} recrystallization texture increases obviously.