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| EVAPORATION BEHAVIOUR OF ELEMENTS DURINGVAR WITH LARGE SECTION CONSUMABLE ELECTRODE OF ALLOY A-286 |
| by FU Jie; HU Yaohuo; ZHAO Junhua (Beijing University of Iron and Steel Technology); ZHAO Yucai; ZHU Jianzhong (Shanghai No. S Steel Works) |
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Cite this article:
by FU Jie; HU Yaohuo; ZHAO Junhua (Beijing University of Iron and Steel Technology); ZHAO Yucai; ZHU Jianzhong (Shanghai No. S Steel Works). EVAPORATION BEHAVIOUR OF ELEMENTS DURINGVAR WITH LARGE SECTION CONSUMABLE ELECTRODE OF ALLOY A-286. Acta Metall Sin, 1986, 22(3): 103-110.
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Abstract The remelted characteristics of a 410 mm diameter consumable electrode and the Mn distribution in various regions at the electrode tip during VAR process of alloy A-286 in a 506 mm diameter water cooled crucible were studied. It was found that the Mn evaporized mainly in the forming period of droplets at the electrode tip. The Mn distributed rather homogeneously in the liquid metal film. As the remelted rate of electrodes was quite small at the end of VAR process, the Mn content of the liquid metal film seemed to be nearly that under the equilibrium conditions for the Mn evaporation reaction. The Mn content increased linearly from the liquid metal film/liquid-solid two phase region interface to the original electrode. It was suggested that the Mn evaporation is controlled by the migration rate of Mn atoms in the two phase region. The Mn content of remelted ingot, [Mn]_i, can be calculated in terms of the following equation: [Mn]_i=[Mn]_e exp (-K_1n_dγW(-1))+[Mn]_f {1-exp(-K_1n_dγ W(-1))} Obviously, [Mn]_i can be controlled by controlling the Mn content of consumable electrode, [Mn]_e, or the remelted rate, W. In addition, the composition of the condensate layer on the crucible wall has been analysed. The results indicated that the condensate layer consisted of the evaporation species Mn, Cr, Fe and Ni and it contained more than 40% of Mn. The. Mn and.Cr contents in the condensate layer were higher than those in the remelted ingot and the Fe and Ni contents in the condensate layer lower, but the Cr, Fe and Ni contents in the remelted ingots were the same as those in the consumable electrodes.
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Received: 18 March 1986
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1 傅杰;王惠;王迪,陈恩普,金属学报,19(1983) ,B 82．
2 曲英主编,炼钢学原理,冶金工业出版社,1980,p.74．
3 Elliott, J.F., Electr. Furnace Conf. Proc., 32 (1974) . 62．
4 Sigworth, G.K.; Elliott, J.F., Met. Sci., 8 (1974) , 488．
5 Kusuhiro Mukai; Toshio Tagami, Trans. Iron Steel Jpn., 15 (1975) , 488 |
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