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研究了硼含量对凝固过程的影响,讨论了疏松的形成过程.硼在γ固溶体中的溶解度很小,凝固时富集于凝固固体前沿液体中.高硼合金凝固时,凝固固体周围包了一层极高硼含量的低熔点液体,形成蜘蛛网似的补缩通道,从而扩大了可补缩的温度区间,减少了不能补缩的剩余液体量.因此,这种合金不仅疏松少,而且工艺宽容度大.正常硼含量(0.01wt-%)合金,硼富集程度不足以形成液体网,凝固枝晶很快相互连接,形成一些较大的孤立的液体池.这种不能补缩的液体池,形成了较严重的疏松.
The effect of boron content on the solidification process was discussed and the formation process of looseness was discussed.The solubility of boron in γ solid solution was very small and concentrated in the front liquid of the solidified solidification.When the high boron alloy was solidified, The extremely high boron content of the low melting point liquid forms a cobweb-like retentate channel, thereby increasing the temperature range of re-shrinkable and reducing the amount of excess liquid that can not be inflated, so that this alloy is not only less spongy, Lattice tolerance Normal boron content (0.01wt-%) alloy, boron enrichment level is not enough to form a liquid network, solidified dendrites quickly connected to each other to form some of the larger isolated liquid pool. This can not make up the liquid Pool, formed a more serious loose.