DD6单晶高温合金760℃的蠕变性能研究

Study on Creep Properties of Single Crystal Superalloy DD6 at 760℃

研究了[001]、[011]和[111]取向760℃不同应力条件下的第二代单晶高温合金DD6的拉伸蠕变性能。结果表明:DD6合金具有明显的拉伸蠕变性能各向异性;在相同的试验条件下,蠕变寿命以[111]、[001]、[011]顺序依次减小;不同取向的稳态蠕变速率不同;三个取向的基体通道类型不同,不同类型基体通道的应力大小不一,小应变量下的蠕变变形主要集中在应力水平较高的基体通道。

The creep properties of the second generation single crystal superalloy DD6 with [001], [011] and [111] orientations have been investigated under different stress levels at 760℃. The results show that the creep properties of DD6 are obviously anisotropic. Creep time decreases in the order [111], [001], [011] under the same test conditions. Stationary strain rates of [001], [011] and [111] orientations are different under the same test conditions. The types of matrix channel with different orientations differ each other and the stress level varies with different matrix channels. The creep deformation at small strains mianly concentrates on the highly stressed matrix channels.