【摘要】 冷坩埚感应熔炼技术提高了钛铝基合金的熔体质量.对合金熔体在该熔炼中自由液面变化的认识,增强了对熔炼过程的控制优化.对Ti48Al(原子分数)进行了冷坩埚感应熔炼实验研究,采用十字钢板烧痕法测试了自由液面形状,计算了熔体自由液面高度,获得了Ti48Al自由液面形状随功率、炉料质量或者密度的经验公式.结果表明:增加功率或减少炉料质量均使自由液面高度增大;Ti48Al比相同熔体体积纯Ti的自由液面高度增加.与纯Ti比较,TiAl基合金的密度小、电导率大,增加功率、减少炉料质量不利于TiAl基合金获得稳定的熔体自由液面.更多还原

【Abstract】 By applying the cold crucible inductive melting(CCIM) to TiAl-based alloys,the qualities of the melt are able to be improved.Especially during the melting,the parameters for melting the molten metal should be optimized and thus controlled.This paper performs the melting procedure of Ti48Al(at%) alloy in a water cooling cold crucible based on an induction melting furnace.The free surface shapes of several batches for Ti48Al and a pure Ti have been measured by socking thin sheets of non-ferrite steel with cross interlock shape.Then the free surface heights are calculated and the empirical relations are put forward regressively about the free surface shape with respect to input power,charge mass and charge density respectively.The results show that increasing the input power and lowering down the charge mass will increase the free surface height of the melt.The free surface height of Ti48Al melt will be higher than that of a pure Ti melt with approximately same quantity in molten volume.As a result,the free surface of a molten TiAl-based alloy will become instability during cold crucible inductive melting when the input power is increased or the charge mass is decreased.This is due to the large differences present in physical parameters between TiAl-based alloys and a pure Ti,where the TiAl-based alloy usually occupies a lower density and a higher electrical conductivity.更多还原