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| EFFECT OF TEMPERATURE DISTRIBUTION ROUND THE MOLTEN SLAG POOL ON INGOT QUALITY DURING ESR PROCESS OF SUPERALLOY |
| by Fu Jie; Chen Enpu; Chen Chongxi and Wang Yong (Beijing University of Iron and Steel Technology) |
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Cite this article:
by Fu Jie; Chen Enpu; Chen Chongxi and Wang Yong (Beijing University of Iron and Steel Technology). EFFECT OF TEMPERATURE DISTRIBUTION ROUND THE MOLTEN SLAG POOL ON INGOT QUALITY DURING ESR PROCESS OF SUPERALLOY. Acta Metall Sin, 1981, 17(4): 394-402.
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Abstract The effect of temperature at slag face on A1 and Ti control and the relation between temperature distribution round liquid metal pool/molten slag pool interface and quality of ingot surface have been investigated during ESR process of superalloy. If the insulation of the mould from its base plate was poor and rather higher temperature appeared at slag face, in the later refining stage the rate of O_2 penetration to slag from atmosphere,ν_(s—g)~(O2),is 2—3 times faster and also in the earlier stage the tendency towards the A1 increasing is greater than that of good insulation. An increase in voltage may cause the temperature at slag face to rise and the Ti loss to accelerate, e.g. every 0.03% more Ti loss at nearly 1 V increased.The temperature distribution round liquid metal pool/molten slag pool interface may be expressed by t=ae~(B/d)(B<0), it has a great influenc upon the quality of ingot surface. The method to ascertain this temperature distribution is presented.The evaluation of quality may be proposed by the change of slag coating thickness, δ=B/(ln t_1—lna). It is shown that the quality of ingot surface is perhaps depended on the electric current distribution in the molten slag pool, the heat conducting conditions at mould wall, the liquidus temperature of slag and the change of all factors affecting the temperature at "high temperature region".
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Received: 18 April 1981
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