The critical pressure and impeding pressure of Al evaporation during induction skull melting processing of TiAl |
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Authors: | Jingjie Guo Jun Jia Hengzhi Fu Guizhong Liu Yanqing Su Hongsheng Ding |
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Affiliation: | (1) the School of Materials Science and Engineering, Harbin Institute of Technology, 150001 Harbin, People’s Republic of China |
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Abstract: | In this article, two key pressures, the critical pressure P crit and the impeding pressure P impe of elemental evaporation, are defined and studied based on the calculation relationship between the evaporation loss rate N m and the chamber pressure P during melting of titanium-aluminum alloys. When the chamber pressure is below P crit or above P impe, N m tends to the maximum or the minimum value and remains almost unchanged. However, if P crit<P<P impe, with the increase of the chamber pressure, N m declines sharply. A method has been put forward to calculate P crit and P impe of Al evaporation in a Ti-XAl (at pct) (X=25 to 50) melt. The calculation result shows that P crit or P impe is a second-order function of the molar percentage of Al and the melt temperature. |
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