Transport phenomena including the electromagnetic,concentration of ions,flow,and thermal fields in the electroslag remelting(ESR)process made of slag,electrode,air,mold,and melt pool are computed considering tertiary ...Transport phenomena including the electromagnetic,concentration of ions,flow,and thermal fields in the electroslag remelting(ESR)process made of slag,electrode,air,mold,and melt pool are computed considering tertiary current distribution.Nernst-Planck equations are solved in the bulk of slag,and faradaic reactions are regarded at the metal-slag interface.Aiming at exploring electrochemical effects on the behavior of the ESR process,the calculated field structures are compared with those obtained using the classical ohmic approach,namely,primary current distribution whereby variations in concentrations of ions and faradaic reactions are ignored.Also,the influence of the earth magnetic field on magnetohydrodynamics in the melt pool and slag is considered.The impact of the polarity of electrode,whether positive,also known as direct current reverse polarity(DCRP),or negative,as known as direct current straight polarity(DCSP),on the transport of oxygen to the ingot of ESR is investigated.The obtained modeling results enabled us to explain the experimental observation of higher oxygen content in DCSP than that of DCRP operated ESR process.展开更多
A funnel-type mold is commonly used to provide necessary clearance for the submerged entry nozzle in the thin slab casting(TSC).The partially solidified shell is subjected to the mechanical deformations,which can lead...A funnel-type mold is commonly used to provide necessary clearance for the submerged entry nozzle in the thin slab casting(TSC).The partially solidified shell is subjected to the mechanical deformations,which can lead to the defects formation and,as a results,to a breakout.Traditionally,the results of the flow simulation,performed by the finite volume method(FVM),are fed to the external package for the finite element analysis of stress and strain.A coupled model was assembled using“creeping solid”approach by blending the Norton-Hoff viscoplastic stress for the solidifying shell with the Newtonian viscous stress of the liquid melt.The FVM was used to combine both liquid and solid stress models within a single solver.The iterative procedure based on the improved both side diffusion method was introduced to treat the nonlinear relation between the viscoplastic stress and the strain rate.The modeled shell thickness was verified by previously published breakout measurements and the simulation results.Temperature distribution,obtained during the TSC simulation,dominantly corresponds to the viscoplastic range.Developed numerical approach is robust and has direct industrial application.展开更多
Correction to:J.Iron Steel Res.Int.(2022)29:88-102 https://doi.Org/10.1007/s42243-021-00734-8The original version of this article unfortunately contained mistakes.The assignment of the affiliations was incorrect,and t...Correction to:J.Iron Steel Res.Int.(2022)29:88-102 https://doi.Org/10.1007/s42243-021-00734-8The original version of this article unfortunately contained mistakes.The assignment of the affiliations was incorrect,and the corrected table is given below.The original article has been corrected.展开更多
文摘Transport phenomena including the electromagnetic,concentration of ions,flow,and thermal fields in the electroslag remelting(ESR)process made of slag,electrode,air,mold,and melt pool are computed considering tertiary current distribution.Nernst-Planck equations are solved in the bulk of slag,and faradaic reactions are regarded at the metal-slag interface.Aiming at exploring electrochemical effects on the behavior of the ESR process,the calculated field structures are compared with those obtained using the classical ohmic approach,namely,primary current distribution whereby variations in concentrations of ions and faradaic reactions are ignored.Also,the influence of the earth magnetic field on magnetohydrodynamics in the melt pool and slag is considered.The impact of the polarity of electrode,whether positive,also known as direct current reverse polarity(DCRP),or negative,as known as direct current straight polarity(DCSP),on the transport of oxygen to the ingot of ESR is investigated.The obtained modeling results enabled us to explain the experimental observation of higher oxygen content in DCSP than that of DCRP operated ESR process.
基金Project(51420105005)supported by the Major International(Regional)Joint Research Program of National Natural Science Foundation of ChinaProject(2016YFF0101301)supported by the National Key Research and Development Program of China
基金the financial support by the Austrian Federal Ministry of Economy,Family and Youth and the National Foundation for Research,Technology and Development within the framework of the Christian Doppler Laboratory for Metallurgical Applications of Magnetohydrodynamics.
文摘A funnel-type mold is commonly used to provide necessary clearance for the submerged entry nozzle in the thin slab casting(TSC).The partially solidified shell is subjected to the mechanical deformations,which can lead to the defects formation and,as a results,to a breakout.Traditionally,the results of the flow simulation,performed by the finite volume method(FVM),are fed to the external package for the finite element analysis of stress and strain.A coupled model was assembled using“creeping solid”approach by blending the Norton-Hoff viscoplastic stress for the solidifying shell with the Newtonian viscous stress of the liquid melt.The FVM was used to combine both liquid and solid stress models within a single solver.The iterative procedure based on the improved both side diffusion method was introduced to treat the nonlinear relation between the viscoplastic stress and the strain rate.The modeled shell thickness was verified by previously published breakout measurements and the simulation results.Temperature distribution,obtained during the TSC simulation,dominantly corresponds to the viscoplastic range.Developed numerical approach is robust and has direct industrial application.
文摘Correction to:J.Iron Steel Res.Int.(2022)29:88-102 https://doi.Org/10.1007/s42243-021-00734-8The original version of this article unfortunately contained mistakes.The assignment of the affiliations was incorrect,and the corrected table is given below.The original article has been corrected.
