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Effect of feeding parameters on ingot segregation and shrinkage pore in Vacuum arc remelting

Journal of Iron and Steel Research(International) 2023年第6期30卷 1268-1278页

作者： Dong-bin Jiang Fu-zhong Yang Jian Zhang Yang Zhou Li-feng Zhang School of Metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Chengdu Advanced Metal Materials Industrial Technology Institute Chengdu 610303SichuanChina School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

The feeding parameters in the final stage of Vacuum arc remelting process obviously affect the solute segregation and shrinkage pore depth.Coupled with the electromagnetic field,fluid flow,and solute transport,a numerical model was built to investigate the effect of feeding parameters on the ingot solidification phenomena.The Nb segregation and shrinkage pore depth in the solidified ingot were measured.The results show that the liquid moves along the solidification front and the vertex flow is formed in the liquid pool,which promotes solute transport.In the solidified ingot,the Nb segregation in the lower part is negative,while that in the upper part is positive.With the differential electrode applied,the positive segregation is slightly reduced but the segregation distribution remains unchanged.As the feeding current decreases,the positive segregation zone moves toward the ingot top surface,due to the final solidification position moving upward.With the feeding time extended,the positive segregation moves to the top surface and the shrinkage pore depth is reduced.As the feeding time is set at 12 min,the shrinkage pore depth can be reduced to 21 mm.

关键词： Vacuum arc remelting Feeding parameter Macrosegregation Shrinkage pore Solidification

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Effects of different helium cooling conditions on the structures of GH4169 alloy Vacuum arc remelting ingots

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Baosteel Technical Research 2020年第4期14卷 40-46页

作者： DAI Pengchao Baowu Special Metallurgy Co. Ltd.Shanghai 200940China

The effects of different helium cooling conditions on the molten pool depth,dendrite structure,and microsegregation of GH4169 alloy ?508 mm Vacuum arc remelting( VAR) ingots were studied using an optical microscope and an electron probe. The results show that under different helium cooling conditions,the growth of columnar crystals in the VAR ingot is the same with a certain angle running from the edge to the center and the dendrites at the edges are relatively small whereas the dendrites near the center are large. As the helium cooling increased,the molten pool depth decreased from 137 mm to 120 mm. Observations of the microstructure showed that as the helium cooling increased,the secondary dendrite arm spacing( SDAS) decreased at the center and R/2 region. Also,the Laves phase content markedly decreased. Under the same helium cooling conditions,the SDAS and Laves phase content at the center were higher than that at the R/2 region. Thus,more intense helium cooling effectively reduced segregation in VAR ingots and improved the metallurgical quality.

关键词： helium cooling GH4169 alloy Vacuum arc remelting

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Influence of Electromagnetic Stirring on the Macrosegregation in arc Remelted Ti and Zr Alloy Ingots

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 199-202页

作者： Alain Jardy Mathieu Revil-Baudard Hervé Combeau Universite de Lorraine Institut Jean Lamour-Dépt.SI2MUMR CNRS 7198Ecole des MinesParc de SauruptNancy F-54042France

A numerical model of the VAR process has been developed in close collaboration with titanium and zirconium producers.The model is based on the solution of the coupled heat,mass and momentum transport equations in the whole ingot(liquid pool,mushy zone and solidified part)using a finite volume method.It accounts for electromagnetic stirring, buoyancy flows and turbulence effects.Solidification mechanisms implemented in the model include a full coupling between energy and solute transport in the mushy zone.The numerical model has been applied to simulate the remelting of Ti6-4.The influence of the applied magnetic field on the fluid flow and segregation behaviour,for a number of different stirring practices,is presented and discussed.Also,the macrosegregation in Zy4 ingots is investigated.The comparison between the predicted segregation and the experimental results shows the importance of accounting for both the stirring and thermosolutal convection to forecast properly the segregation in remelted ingots.

关键词： Vacuum arc remelting simulation zirconium titanium macrosegregation stirring

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