Reoxidation of liquid steel and evolution of inclusions during protective atmosphere electroslag remelting of Ce-containing heat-resistant stainless steel  

作　　者：Yu Zhao Cheng-bin Shi Shijun Wang Peng Ren Jing Li 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing(USTB),Beijing 100083,China

出　　处：《Journal of Iron and Steel Research International》2024年第8期1923-1935,共13页钢铁研究学报（英文版）

基　　金：The authors are grateful to the financial support from the National Natural Science Foundation of China(Grant Nos.52074027,52274314,and 51874026);The financial support by the State Key Laboratory of Advanced Metallurgy(Grant No.41623010)is greatly acknowledged.

摘　　要：The evolution of Ce-containing inclusions and its correlation with the reoxidation of liquid steel during protective atmosphere electroslag remelting(ESR)of heat-resistant steel were studied.The reoxidation of liquid steel took place during the ESR,resulting in the oxygen pickup from 0.0014 to 0.0053 wt.%.The inclusions in the consumable electrode,liquid metal pool and remelted ingot are Ce_(2)O_(2)S and Ce_(2)O,inclusions invariably.The inclusions in the remelted ingot are originated from three ways:(I)the original inclusions from the electrode;(Il)the newly formed Ce_(2)O_(2)S and Ce_(2)O_(3) inclusions in the liquid metal pool by reoxidation remaining still in remelted ingot;(IlI)the newly generated Ce2O2S and Ce_(2)O_(3) inclusions during cooling and solidification of liquid steel.The relative proportions of Ce_(2)O_(3) inclusions in liquid metal pool and remelted ingot are 41% and 76.5%,respectively.The inclusions ranging from 2 to 5μm in the remelted ingot take up 55%,followed by the inclusions smaller than 2μm(43%of total inclusions).The number proportion of the Ce_(2)0,inclusions in the liquid metal pool which were removed by floating up into slag is 1.96×10-5%.

关 键 词：Non-metallic inclusion Electroslag remelting Rare earth cerium REOXIDATION Inclusion evolution 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TF744[金属学及工艺—金属材料]