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利用手工电弧炉熔炼制备了Zr质量分数为0.00%~0.07%的K4169合金,采用金相显微镜、扫描电镜、能谱仪以及差热分析对合金的凝固组织、元素偏析及熔点进行了研究。结果表明,Zr的加入促进了合金中Nb、Mo、Ti等元素的偏析,使铸态合金晶界析出的Laves相和碳化物数量增多,但随着Zr含量的增加Laves相又有所减少。Zr的加入提高了Laves相初熔温度,降低了合金的熔点。另外,微量Zr对K4169合金的凝固组织不利。
The K4169 alloy with Zr content of 0.00% ~ 0.07% was prepared by hand electric arc furnace. The microstructure, elemental segregation and melting point of the alloy were studied by metallographic microscope, scanning electron microscope, energy dispersive spectrometer and differential thermal analysis. The results show that the addition of Zr promotes the segregation of Nb, Mo, Ti and other elements in the alloy, which increases the amount of Laves phase and carbides precipitated in the as-cast alloy grain boundaries, but decreases with the increase of Zr content. The addition of Zr improves the initial melting temperature of Laves phase and decreases the melting point of the alloy. In addition, a trace amount of Zr is unfavorable to the solidification structure of the K4169 alloy.