铸造温度——速度参数对无碳单晶高温合金组织的影响

INFLUENCE OF CAST TEMPERATURE—RATE PARAMETERS ON MICROSTRUCTURES OF CARBON—FREE SINGLE CRYSTAL SUPERALLOYS

研究了在两种定向凝固炉和ISP2/Ⅲ—DS上以不同的铸造参数制得的两种单晶高温合金DD3和36的显微组织,结果表明:在8炉上得到的单晶具有较细的枝晶尺寸、较分散的相组成以及较少的显微疏松,这是因为8炉的固—液界面温度梯度比ISP2/Ⅲ—DS炉高约50％。

This work has investigated the microstructures of two single crystal superalloys, DD3 and ЖС36,producted under diffrent cast parameters in two D. S equipment У BHK-8П and ISP2/Ⅲ—DS,which possess different temperature gradient on solidifying solid—liqUid interface. The results show that the single crystal microstructure obtained in У BHK-8П furnace has finer dendrite size, more dispersive phase structure and less microporosity than that in ISP2/Ⅲ—DS furnace due to about 50％ higher temperature gradient in the former.