Prediction of spatial distribution of the composition of inclusions on the entire cross section of a linepipe steel continuous casting slab

作     者：Qiang Ren Yuexin Zhang Ying Ren Lifeng Zhang Jujin Wang Yadong Wang Qiang Ren;Yuexin Zhang;Ying Ren;Lifeng Zhang;Jujin Wang;Yadong Wang

作者机构：School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第61卷第2期

页      面：147-158页

核心收录：

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：supported financially by the National Science Foundation China(Nos.U1860206 and 51725402) the Fundamental Research Funds for the Central Universities(Nos.FRF-TP-17-001C2 and FRF-TP-19-037A2Z) the High Steel Center(HSC)at Yanshan University Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials(ICSM)and the High Quality Steel Consortium(HQSC)at University of Science and Technology Beijing(USTB),China 

主　　题：Inclusions Linepipe steel Continuous casting slab Mass transfer Thermodynamics Kinetics 

摘      要：In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al_(2)O_(3)-CaO inclusions reacted with the bulk steel and transformed to CaS-Al_(2)O_(3)-MgO-(CaO) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly CaS-Al_(2)O_(3)-MgO-(CaO) in slab center and were MgO-Al_(2)O_(3)-CaO-CaS within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.