在800,850,900℃的温度条件下,对第二代单晶高温合金DD6的横向持久性能进行了研究.结果表明:与相同条件下的纵向即[001]取向持久性能相比,合金横向持久寿命低于纵向持久寿命.在相对较高温度下,合金横向与纵向的持久寿命在数值上相差较小;在相对较低温度下,合金横向持久寿命明显低于纵向.随着实验温度的升高,扩散蠕变作用增强,韧窝断裂的倾向增加,同时枝晶间和枝晶干变形均匀,横向持久性能相对提高而接近于纵向持久性能.垂直于应力轴的一次枝晶界和枝晶间区域的存在,是横向持久性能低于[001]取向的主要原因.
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