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采用SEM、EDS和XRD对不同加热温度下W470连铸坯氧化铁皮的微观形貌及相结构进行研究。结果表明,W470氧化铁皮难以除去的原因是氧化铁皮熔化,液相包裹着FeO,凝固时发生共晶反应,生成FeO/Fe2SiO4共晶混合物,并深嵌入基体。降低加热炉的加热温度,使连铸坯全程在FeO/Fe2SiO4共晶混合物熔点(1177℃)以下加热,可降低氧化铁皮与基体的结合力,能够有效解决W470除鳞困难问题。
SEM, EDS and XRD were used to study the microstructure and phase structure of the W470 continuous cast iron oxide scale at different heating temperatures. The results show that the reason why W470 scale is hard to remove is that the scale is melted, the liquid phase wraps FeO, eutectic reaction occurs during solidification, and the FeO / Fe2SiO4 eutectic mixture is formed and deeply embedded into the matrix. The heating temperature of the heating furnace is reduced so that the entire slab is heated below the melting point of the FeO / Fe2SiO4 eutectic mixture (1177 DEG C) to reduce the binding force between the scale and the substrate, and the W470 descaling difficulty can be effectively solved.