Numerical simulation on solidification behavior and structure of 38CrMoAl large round bloom using CAFE model  

作　　者：Rui-song Tan Wei Liu Bo Song Shu-feng Yang Yong-feng Chen Xiao-tan Zuo Yan Huang 

机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Wuhu Xinxing Ductile Pipe Co.,Ltd.,Wuhu 241002,Anhui,China

出　　处：《Journal of Iron and Steel Research International》2023年第6期1222-1233,共12页

摘　　要：A coupled cellular automaton-finite element model was developed to simulate the solidification behavior and structure of 38CrMoAl large round bloom,in which mold electromagnetic stirring+final electromagnetic stirring was taken into consideration,under different superheat,casting speeds,and secondary cooling water flow.Industrial trials for infrared temperature measurement and macro etch experiments of the post-test round bloom samples were used to verify the simulated solidification structure and temperature field.The simulation results show that superheat and secondary cooling water flow have little influence on the surface temperature,center temperature,and center solid fraction while casting speed has a more obvious influence on solidification behavior.With the increase in the casting speed of 0.02 m min^(-1),the solidification position is prolonged by about 1.64 m.With the increasing specific water ratio by 0.02 L kg^(-1) each,the surface temperature of the secondary cooling zones decreases by about 18℃,and the solidification position shortens by about 0.11 m.As the superheat increases from 10 to 40℃,the ratio of the equiaxed crystal zone decreases from 35.98% to 23.98%.The casting speed and secondary cooling water flow increase the equiaxed crystal ratios of the large round bloom,but neither is significant,both being about 2%.

关 键 词：38CrMoAl large round bloom CAFE model Solidification structure SUPERHEAT Casting speed Secondary cooling water flow 

分 类 号：TG142[一般工业技术—材料科学与工程]