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为进一步节约能源,仅启动一个电炉用于融化铁水,通过外加高碳铬铁颗粒,采用离心复合铸造工艺,制备了高铬铸铁-球墨铸铁复合轧辊。通过扫描电镜、能谱及X射线衍射等手段,分析研究了复合轧辊耐磨层的组织及性能。结果表明,耐磨层的微观组织为马氏体+Cr7C3+残余奥氏体+少量Cr23C6、Cr3C;耐磨层的冲击韧度达6.0 J/cm2,硬度保持在HRC 59.0左右;2种合金的复合界面达到良好的冶金结合,该复合结构材料可满足轧辊的工作要求。
In order to further save energy, only one electric furnace was started for melting molten iron, and a high-chromium cast iron-ductile iron composite roll was prepared by applying high-carbon ferrochromium particles and a centrifugal composite casting process. The microstructure and properties of the wear layer of the composite roll were analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results show that the microstructure of the wear-resistant layer is martensite + Cr7C3 + retained austenite + a small amount of Cr23C6, Cr3C; the impact toughness of the wear-resistant layer is 6.0 J / cm2 and the hardness is maintained at HRC 59.0; Metallurgical interface to achieve a good combination of the composite structural materials to meet the work requirements of the roll.