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采用多元合金化处理共晶31Cr高铬铸铁,借助金相显微镜、扫描电镜、AXIOS(PW4400)型X荧光及Leica图像分析仪对金相组织、成分、碳化物尺寸及形貌进行分析。结果表明,经多元合金化后,碳化物尺寸细化、形貌改善,碳化物形状因子K先增大后减小,粒度因子D先减小后增大;确定了最佳成分,其碳化物的形状因子K=0.83,粒度因子D=0.66μm;共晶组成相形核及长大机制转变的复合作用改善了碳化物尺寸;溶液中碳原子活度、碳化物界面张力的改变和产生离异共晶的共同作用导致了碳化物形貌的演变。
The multi-alloying treatment of eutectic 31Cr high chromium cast iron was carried out to analyze the microstructure, composition, carbide size and morphology by means of metallographic microscope, scanning electron microscope, AXIOS (PW4400) X-fluorescence and Leica image analyzer. The results show that the size of carbides increases first and then decreases, and the size factor D first decreases and then increases. The optimum composition of carbides The shape factor K = 0.83, the particle size factor D = 0.66μm; The eutectic composition of the nucleation and growth mechanism of the transformation of the complex effect of improving the size of the carbide; The activity of carbon atoms in the solution, the change of carbide interfacial tension and produce dissociation The combined effect of the crystal leads to the evolution of the carbide morphology.