氧化钴对包晶钢保护渣热流密度影响的试验研究

Effect of cobalt oxides on the heat flux density of the mould powder for the peritectic steel casting

使用热流密度低的缓冷型保护渣可缓解包晶钢浇铸过程中因包晶相变导致的表面纵裂纹产生。当新型助熔剂氧化钴添加量从1%增加到2%时,保护渣热流密度呈现下降趋势,当从2%增加到2.5%时,保护渣热流密度呈现增加趋势。并且氧化钴添加到包晶钢保护渣中,实验样热流密度均小于工业保护渣。通过对色度进行研究,发现试样热流密度与色度相对应,说明氧化钴降低保护渣的热流密度是通过改变玻璃相的色度来实现的。

The surface longitudinal cracks caused by the peritectic transformation can be alleviated by using the retarded cooling type mould powder with the poor heat transfer ability during the casting of the peritectic steel（PS）.When the content of the cobalt oxides was increasing from 1 %to 2 %in the mould powder,the heat flux density of the mould powder showed the downward tendency;when the content was increasing furthermore from 2 %to 2.5 %,the heat flux density turned upwards.When the cobalt oxides were added into the mould powder used for the peritectic casting,the heat transfer density of this powder was lower than that of the commercial mould powder.Through CIE analysis,the result showed that the heat flux density corresponded to the chromaticity.This showed that the cobalt oxide could be used to lower the heat flux density by influencing the chromaticity of glass phase.