在高温度梯度真空定向凝固炉中,制备不同C含量的单晶高温合金,研究不同C含量对第二代单晶高温合金显微组织的影响.结果表明:C含量对合金枝晶间距的影响较小;随着C含量增加,共晶含量和尺寸减小,碳化物含量增加,其形貌由块状向骨架状、汉字状转变;随着C含量增加,Ta元素枝晶偏析减轻,Re,W,Mo,Nb元素枝晶偏析加重;C含量对铸态和热处理γ′相尺寸和形貌影响较小;热处理后碳化物的形貌无明显变化.
The single crystal superalloy with different C contents was casted using master alloy of DD6 in the directionally solidified furnace.The effect of C content on the microstructure of the second generation single crystal superalloy was investigated.The results show that C content has no obvious effect on the dendrite arm spacing.With the increase of C content,the volume fraction and size of γ/γ′ eutectic decrease.However,the volume fraction of carbide increases,and its morphologies change from blocky shape to frame work-like and Chinese-script-like with the increase of C content.With the increase of carbon content,the segregation of Ta decreases while the segregation of Re,W,Mo,Nb increases.C content has no obvious effect on the shape and size of γ′ phase in as cast microstructure or after heat treatment.The morphology of carbide has no distinct change after heat treatment.
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