An innovative steelmaking process is suggested using an electromagnetic driven swirling flow in the up-leg of an RH vacuum degasser.A physical and a mathematical model based on 300t RH vacuum degasser are developed to...An innovative steelmaking process is suggested using an electromagnetic driven swirling flow in the up-leg of an RH vacuum degasser.A physical and a mathematical model based on 300t RH vacuum degasser are developed to understand the effect of rotating electromagnetic field on the circulation flow rate and the two phases flow behavior of RH system.Both water model experiments and numerical simulation show the flow pattern and distribution of gas bubbles. The gas bubbles move towards the centre of up-leg under the effect of rotating electromagnetic field,and the accumulation of gas bubbles depends on the magnetic intensity.An optimization value of magnetic intensity was suggested in this paper.展开更多
Cu-36 wt%Zn alloy is widely used in valves of water and heating and auto parts,etc.Nevertheless,the structure is still coarse,and performances are much poor.The structure and performances of Cu-36 wt%Zn alloy were inv...Cu-36 wt%Zn alloy is widely used in valves of water and heating and auto parts,etc.Nevertheless,the structure is still coarse,and performances are much poor.The structure and performances of Cu-36 wt%Zn alloy were investigated by adding Al_(2)O_(3)nanoparticles and stirring.Results indicate that by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring,the Cu-36 wt%Zn alloy with refined microstructure was successfully prepared.The average grain size is refined by 99%compared with that without nanoparticles and stirring.The tensile strength(R_m)and percentage elongation after fracture(A11.3)increase by 20.58%and 19.40%,respectively,compared with that without nanoparticles and stirring.Nanoparticles increase heterogeneous nucleation rate by 50%compared with that without nanoparticles.The depth of dezincification layer decreases by 78.71%compared with that without nanoparticles and stirring,as protective layer(Cu-Al_(2)O_(3)-Zn)is completely formed around the grain boundaries.展开更多
基金financially supported by the Fundamental Research Fund for the Zhejiang Provincial Laboratory of Testing and Deep Processing for Measuring and Cutting Tools(No.ZD201202)
基金Item Sponsored by National Natural Science Foundation of China[No.51004029]
文摘An innovative steelmaking process is suggested using an electromagnetic driven swirling flow in the up-leg of an RH vacuum degasser.A physical and a mathematical model based on 300t RH vacuum degasser are developed to understand the effect of rotating electromagnetic field on the circulation flow rate and the two phases flow behavior of RH system.Both water model experiments and numerical simulation show the flow pattern and distribution of gas bubbles. The gas bubbles move towards the centre of up-leg under the effect of rotating electromagnetic field,and the accumulation of gas bubbles depends on the magnetic intensity.An optimization value of magnetic intensity was suggested in this paper.
基金financially supported by the National Natural Science Foundation of China(No.51571160)the Fundamental Research Fund for Taizhou Science and Technology(No.131KY02)+1 种基金the Public Welfare Projects of Science and Technology Department of Zhejiang Province(No.2015C31143)the Pivot Innovation Team of Shaanxi Electric Materials and Infiltration Technique(No.15JS071)。
文摘Cu-36 wt%Zn alloy is widely used in valves of water and heating and auto parts,etc.Nevertheless,the structure is still coarse,and performances are much poor.The structure and performances of Cu-36 wt%Zn alloy were investigated by adding Al_(2)O_(3)nanoparticles and stirring.Results indicate that by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring,the Cu-36 wt%Zn alloy with refined microstructure was successfully prepared.The average grain size is refined by 99%compared with that without nanoparticles and stirring.The tensile strength(R_m)and percentage elongation after fracture(A11.3)increase by 20.58%and 19.40%,respectively,compared with that without nanoparticles and stirring.Nanoparticles increase heterogeneous nucleation rate by 50%compared with that without nanoparticles.The depth of dezincification layer decreases by 78.71%compared with that without nanoparticles and stirring,as protective layer(Cu-Al_(2)O_(3)-Zn)is completely formed around the grain boundaries.
