采用手工电弧炉熔炼制备了不同Al含量的K4169高温合金。显微组织和力学性能研究表明:随着Al含量的增加,合金铸态组织的二次枝晶臂变得发达,枝晶间析出相增多,Nb、Mo、Ti和Fe元素在枝晶和枝晶间的偏析程度减轻;Al含量增加使得合金的屈服强度和硬度明显提高,当Al含量为1.25wt%时,其屈服强度和硬度达到最大值,但是Al含量增加至1.45wt%时,合金晶界上析出了大量的Laves相,反而降低了合金的屈服强度和硬度。 K4169 superalloy with different content of Al was prepared by manual electric arc furnace. The results of microstructure and mechanical properties show that the secondary dendrite arm of the as-cast microstructure of as-cast alloy becomes more and the interdendritic precipitates increase with the increase of Al content. The addition of Nb, Mo, Ti and Fe in dendrite and dendrite The segregation degree between the alloys is reduced; the yield strength and hardness of the alloy increase obviously with the increase of Al content. When the content of Al is 1.25wt%, the yield strength and hardness reach the maximum, but when the Al content increases to 1.45wt% On the precipitation of a large number of Laves phase, but reduced the alloy yield strength and hardness.