第二代单晶高温合金DD6的横向拉伸性能

Transverse Tensile Properties of Second Generation Single Crystal Superalloy DD6

在800-950℃的条件下，研究了第二代单晶高温合金DD6的横向拉伸性能。结果表明：随着温度的升高，横向拉伸强度下降，横向伸长率先增加然后明显下降；与合金的纵向性能即[001]取向性能相比，在较高温度下横向伸长率明显小于纵向伸长率；随着温度的升高，沿枝晶界面易于形成显微裂纹，导致塑性降低。

At 800-950℃, the transverse te alloy DD6 were investigated. The results nsile properties of the second generation single crystal super- show that the transverse ultimate tensile strength decreases with temperature increasing. The transverse elongation increases first, then markedly decreases with temperatures increasing, and at higher temperatures the transverse elongation is clearly less than the longitudinal elongation. It is considered that the microcracks are apt to form on the dendritic interfaces with temperature increasing, as leads to plasticity decreasing.