研究了5种不同含量的C对单晶高温合金凝固组织及持久性能的影响.结果表明,随着C含量的增加,共晶数量明显减少,碳化物数量增多,且碳化物主要分布在枝晶间区域,当C含量较高时,在枝晶干上也有少量碳化物出现.经过热处理后,合金的枝晶间粗大的γ/γ'共晶基本消除,枝晶间少量未被固溶掉的γ/γ'共晶,达到了较好的均匀化效果;碳化物形貌比铸态更为简单,尺寸明显减小,体积分数减小,且分布更加弥散,碳化物类型更加丰富,出现了粒状和链状的M23C6碳化物.随C含量增加合金的高温持久寿命先增大后减小,当C含量为0.045％时,高温持久寿命最大.引起持久性能变化的主要原因是由于合金中未消除的共晶、碳化物及缩松的存在,未消除的共晶以及碳化物都是裂纹萌生的位置,而共晶和碳化物的数量随着C含量的增大又呈相反的变化趋势,因此C的加入要适量.
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