Effects of bath annealing parameters on the microstructures and mechanical properties of thin specification cold-rolled IF steel
The effects of annealing parameters on cold-rolled IF steel was finished via modeling experiments.Cold-rolled steel sheet with first reduction rate of 50% and 2rd reduction of 80% was chosen in the laboratory,after the soaking stage the steel sheet was cooled down to 550℃ and air cold to room temperature.Modeling experiments were aimed at studying the recrystallization rule of thin specification cold-rolled IF steel and confirming the effects of main annealing process parameters (annealing temperature,soaking time) on the deep-drawing performance.The results of the study show that,the recrystallization temperature of thin specification IF steel is 20℃ lower than that of conventional thickness of specifications,the scope for 540 ℃ ~640 ℃,and complete recrystallization happens when it is above 640 ℃.The annealing temperature has significant effects on the deep-drawing performance.When below 700 ℃, the higher the heating temperature,the higher the elongation and r value.But higher temperature (such as 720 ℃) would lead to coarse grains and decrease in the ductility.Grain size and r value increase gradually with the growth of soaking time.111 texture forms in annealing process,and 111 oriented grains grow at the expense of other oriented(mainly 100 oriented)grains during grain growth after recrystallization.Higher distortion energy stored in cold-rolled process makes thin specification IF steel with a high ratio of 111 〈110〉/001 〈110〉.
IF steel recrystallization temperature heating temperature soaking time texture
Song Ren-Bo Yang Fu-Qiang Du Jing-Jing
School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-5
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）