Effect of Scale Formation on Copper Enrichment Behavior in Continuously Cast Slab  

作　　者：Nan WANG Jin XU Shan YU Guang-zong ZHANG Guang-hao CHEN Min CHEN 

机构地区：[1]School of Metallurgy,Northeastern University [2]School of Computer Science and Engineering,Northeastern University

出　　处：《Journal of Iron and Steel Research International》2016年第8期739-744,共6页

基　　金：Item Sponsored by National Natural Science Foundation of China(51174052,51374062,51574065,51574066)

摘　　要：Copper enrichment behavior in continuously cast slab induced by scale formation during continuous cooling was experimentally investigated,and the effects of initial slab surface temperature and oxygen potential in atmosphere were discussed.The results showed that a loose scale adhered to the substrate was formed in H2O-N2 atmosphere at higher slab surface temperature compared to a gap formed between the scale and the steel substrate after continuous cooling in H2O-O2-N2 atmosphere.Under the condition of continuous cooling in H2O-N2 atmosphere,the copper enrichment occurred both within the loose scale and at the scale/steel interface with simultaneous Ni enrichment near the interface at higher slab surface temperature.The combined effects of the loose scale and nickel enrichment were thought to promote the back-migration of Cu-rich phase from the interface and occlusion within the scale layer.While in H2O-O2-N2 atmosphere,the Cu enrichment was found on the steel side and the formed gap prevented the migration of Cu to the scale.Copper enrichment behavior in continuously cast slab induced by scale formation during continuous cooling was experimentally investigated,and the effects of initial slab surface temperature and oxygen potential in atmosphere were discussed.The results showed that a loose scale adhered to the substrate was formed in H2O-N2 atmosphere at higher slab surface temperature compared to a gap formed between the scale and the steel substrate after continuous cooling in H2O-O2-N2 atmosphere.Under the condition of continuous cooling in H2O-N2 atmosphere,the copper enrichment occurred both within the loose scale and at the scale/steel interface with simultaneous Ni enrichment near the interface at higher slab surface temperature.The combined effects of the loose scale and nickel enrichment were thought to promote the back-migration of Cu-rich phase from the interface and occlusion within the scale layer.While in H2O-O2-N2 atmosphere,the Cu enrichment was found on the steel side and the formed gap prevented the migration of Cu to the scale.

关 键 词：loose migration enrichment Enrichment nickel simultaneous crystalline continuously subsequent removed 

分 类 号：TF777[冶金工程—钢铁冶金]