在含铪铸造镍基高温合金熔凝过程中,当温度在1 250～1 290℃范围时,富Hf熔体常沿枝晶间毛细管道外渗,并在铸件或热处理件表面形成富Hf液膜。这种液膜对已产生的裂纹有“自愈”作用,使含铪合金的焊接性能显著提高,无论熔化区或热影响区裂纹数目和密度都比不含Hf的合金低一个量级。趋肤液还与壳模反应形成HfO_2层。 Hf molten nickel-based superalloy fusion process, when the temperature in the range of 1 250 ~ 1 290 ℃, Hf melt often along the interdendritic capillary pipe extravasation, and in the casting or heat treatment of the surface of the formation of Hf-rich liquid film . This liquid film has a “self-healing” effect on the crack that has occurred, significantly improving the weldability of the hafnium-containing alloy, both in the melting zone or in the heat affected zone, by one order of magnitude less than the alloy without Hf . The skin lotion also reacts with the shell mold to form a layer of HfO 2.