Effect of CeO₂ on heat transfer and crystallization behavior of rare earth alloy steel mold fluxes

Ze-yun Cai，Bo Song，Long-fei Li，Zhen Liu，Xiao-kang Cui

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing

摘 要：To improve the heat transfer capability and the crystallization property of the traditional mold flux, CaF₂ was replaced with B₂O₃. Then, the influences of CeO₂ on the heat transfer and the crystallization of the CaF₂-bearing mold flux and the new mold flux with 10 wt% B₂O₃ were studied using a slag film heat flux simulator and X-ray diffraction（XRD）. The results revealed that the addition of CeO2 reduced the heat transfer by increasing the solid slag thickness and the crystallization of two mold fluxes. However, CeO₂ had less effect on the B₂O₃-containing mold flux compared with the CaF₂-bearing mold flux. According to the analyses, the CeO₂ contents in the CaF₂-bearing mold flux and the B₂O₃-containing mold flux should not exceed 8 wt% and 12 wt%, respectively. Therefore, these experimental results are beneficial to improve and develop the mold flux for casting rare earth alloy steels.

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