Ni3Al基IC6返回料合金的显微组织与力学性能

利用带能谱的扫描电镜（SEM／EDS）和透射电镜（TEM）等分析手段研究了返回料添加比例对Ni3Al基合金IC6成分，显微组织及力学性能的影响。结果表明，返回料的加入对合金中主量元素的成分没有明显影响，但C，N含量随返回料加入比例增加而升高；除了在枝晶间析出了一些M6C碳化物颗粒外，IC6返回料合金的显微组织与新料合金没有明显差别；返回料的加入对IC6合金的室温拉伸性能几乎没有影响，高温持久性能略有下降，冷热疲劳性能明显恶化。建议在实际生产中返回料添加比例不超过50％。

Microstructure and Mechanical Properties of Recycled Ni3Al Base Alloy IC6

The effect of recycle proportion on the composition, microstructure and mechanical properties of recycled Ni 3Al base alloy IC6 was examined by scanning electron microscopy with X ray energy dispersive spectrometer (SEM/EDS) and transmission electron microscopy (TEM). The results indicate that the addition of recycled scraps has no obvious effect on the chemical composition, except the content of C and N increases with the addition proportion of recycled scraps. The microstructure of IC6 recycled alloys has no obvious difference compared with the fresh alloy, except some M 6C carbides precipitate in the interdendritic area. In contrast with fresh alloy, tensile properties at R. T. of the IC6 recycled alloys have almost no change, the high temperature stress rupture properties decrease slightly, and the thermal fatigue properties deteriorate obviously. The recycle proportion of IC6 alloy should not exceed 50% in production of gas turbine vanes.