为获得Cr元素在新一代单晶高温合金中的作用,在真空定向凝固炉中采用螺旋选晶法制备Cr的质量分数为2%和4%的两种单晶高温合金,保持其他合金元素含量不变,用JMat Pro软件计算、光学显微镜、扫描电镜、热分析等方法研究Cr含量对单晶高温合金凝固特征和凝固组织的影响。结果表明:随着Cr含量的增加,合金的固相线、液相线降低,固溶热处理窗口变窄,而糊状区宽度增加,γ′相含量和组织不稳定性增加;合金一次枝晶间距稍有减小,共晶含量增加,合金元素的枝晶偏析程度增加;合金枝晶干、枝晶间的γ′相尺寸减小,其均匀化和立方化程度稍有增加。 In order to obtain the effect of Cr element in a new generation of single crystal superalloy, two kinds of single crystal superalloys with mass fraction of 2% and 4% of Cr were prepared by spiral pickering in a vacuum directional solidification furnace to keep the content of other alloying elements Unchanged. The effects of Cr content on solidification characteristics and solidification structure of single crystal superalloys were studied by using JMat Pro software, optical microscope, scanning electron microscope and thermal analysis. The results show that with the increase of Cr content, the solidus and liquidus of the alloy decrease, the solution heat treatment window becomes narrower, while the width of mushy zone increases and the content of γ ’phase and the instability of the structure increase. The distance between the dendrite and the dendrites decreases slightly and the eutectic content increases slightly and the degree of dendritic segregation of the alloying elements increases. The size of the γ ’phase between the dendrite and the dendrite decreases and the degree of homogenization and cubing increases slightly.