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用差热分析法（ＤＴＡ）研究微量元素Ｃ，Ｂ，Ａｌ，Ｚｒ对一种Ｃｏ基高温合金初熔温度的影响，表明微量元素的加入，对熔化温度无明显影响，但导致合金初熔温度明显降低，Ｂ的影响最为显著，Ｃ次之，Ａｌ，Ｚｒ略有影响．并且，用金相探针法研究不同温度下合金的微观组织，发现合金从枝晶间开始熔化，随温度提高，熔化区域向枝晶于扩展，电子探针研究表明微量元素在枝晶间高度富集，用图像分析法定量研究合金的熔化体积百分数随温度的变化规律，确定合金的初熔温度．ＤＴＡ和金相探针法的测定结果十分吻合．
The effects of trace elements C, B, Al and Zr on the incipient melting temperature of a Co-base superalloy were investigated by DTA. The results showed that the addition of trace elements had no significant effect on the melting temperature, but the initial melting temperature Significantly lower, B the most significant impact, C times, Al, Zr slightly affected. In addition, the microstructure of the alloy at different temperatures was studied by the metallographic probe method. It was found that the alloy began to melt from the interdendritic region. With the increase of temperature, the dendrite expanded in the melted region. Electron probe study showed that the trace elements in the interdendritic height Enrichment, quantitative analysis by image analysis of the alloy melting volume percentage with temperature variation, to determine the initial melting temperature of the alloy. DTA and metallographic probe method is in good agreement.