特种合金电磁软接触定向凝固冷却新工艺

A new cooling process for soft contact electromagnetic confinement and directional solidification of special alloys

通过对流化床传热特性的研究,提出了一种适用于特种合金在真空下定向凝固的冷却新工艺,并确定了最佳的冷却工艺配置.结果表明:液氮作为流化介质,在0.3 Pa压力作用下、100目SiC颗粒作为固体介质、采用喷嘴与隔热板间距为10 mm的工艺配置、抽拉速度9 mm/min时,固液界面温度梯度可达260 K/cm,并且实现了高温合金的软接触电磁成形,获得了高温合金近叶片状样件及一次枝晶间距平均为60μm的定向凝固组织.

On the basis of studying the characteristics of heat transfer in the fluidized bed, the new cooling process for directional solidification of special alloys under vacuum is presented, and the appropriate process parameters are elected. The results show that temperature gradient 260 K/cm in the S/L and the near blade samples of superalloy with solidified structure first dendrite arm spacing 60 μm are obtained by soft contact electromagnetic confinemeng and directional solidification under liquid nitrogen pressure 0. 3 Pa, 100^# SiC particle, using the distance 10 mm between ejection and thermal baffle process scheme and drawing velocity 9 mm/min condition.