Characteristics of inclusions in high-Al steel during electroslag remelting process

作     者：Cheng-bin Shi Xi-chun Chen Han-jie Guo 

作者机构：State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Research Institute of High Temperature Materials Central Iron and Steel Research Institute Beijing 100081 China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2012年第19卷第4期

页      面：295-302页

核心收录：

学科分类：080706[工学-化工过程机械] 08[工学] 0806[工学-冶金工程] 0807[工学-动力工程及工程热物理] 080601[工学-冶金物理化学] 

基　　金：supported by the International Science and Technology Cooperation and Exchange of Special Projects (No.2010DFR50590) 

主　　题：electroslag remelting aluminum nitride inclusions thermodynamics 

摘      要：The characteristics of inclusions in high-A1 steel refmed by electroslag remelting （ESR） were investigated by image analysis, scanning electron microscopy （SEM）, and energy-dispersive spectrometry （EDS）. The results show that the size of almost all the inclusions observed in ESR ingots is less than 5 μm. Inclusions smaller than 3 μm take nearly 75% of the total inclusions observed in each ingot. Inclu- sions observed in ESR ingots are pure AIN as dominating precipitates and some fine spherical Al2O3 inclusions with a size of 1 μm or less. It is also found that protective gas operation and slag deoxidation treatment during ESR process have significant effects on the number of inclusions smaller than 2μm but little effects on that of inclusions larger than 2 μm. Thermodynamic calculations show that AIN inclusions are unable to precipitate in the liquid metal pool under the present experimental conditions, while the precipitation of AlN inclusions could take place at the solidifying front due to the microsegregation orAl and N in liquid steel during solidification.