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| KINETICS OF Mg EVAPORATION OF A Ni-BASE SUPERALLOY DURING VIM |
| CHEN Enpu; SU Zhaoqian (Changcheng Steel Works; Jianyou; Sichuan); FU Jie; WANG Hui; WANG Di (Beijing University of Iron and Steel Technology) (Manuscript received 19 November; 1982) |
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Cite this article:
CHEN Enpu; SU Zhaoqian (Changcheng Steel Works; Jianyou; Sichuan); FU Jie; WANG Hui; WANG Di (Beijing University of Iron and Steel Technology) (Manuscript received 19 November; 1982). KINETICS OF Mg EVAPORATION OF A Ni-BASE SUPERALLOY DURING VIM. Acta Metall Sin, 1984, 20(1): 71-77.
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Abstract The kinetics of Mg evaporation of a Ni-base superalloy, Ni-10Cr-15Co-6W-6Mo-4Al-2Ti, during VIM has been studied. It was indicated that the rate of Mg evaporation is simultaneously controlled by the diffusion of Mg through the liquid boundary layer and by the evaporation of Mg at the metal pool/atmosphere interface, rather than its diffusion through the gas boundary layer, when the furnace Ar pressure kept under 100—400 mmHg. The transfer coefficient of Mg evaporation K_(23) is 10~(-1)—10~(-2) cm. s~(-1) and K_4 is about 140cm. s~(-1). A simple mathematical model for Mg evaporation during VIM was proposed. This model provided that the predicted Mg contents are in excellent agreement with those analyzed in the experimental and industrial alloys. Thus, it is possible that the optimum Mg content may be accurately controlled by certain smelting parameters, such as, the amount of Mg added into the metal pool, the Ar pressure, the temperature and time of evaporation, etc.
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Received: 18 January 1984
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1 傅杰;王惠;王迪;陈恩普,金属学报,19(1983) ,B82．
2 Ward, R.G., J. Iron Steel Inst., 201 (1963) , 11．
3 Ward, R.G.; Aurini, T.D., ibid., 204 (1966) , 920．
4 曲英,炼钢学原理,冶金工业出版社,1980,p.74． |
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