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通过扫描电镜和X射线能谱分析仪(X-EDS)分析,对低合金钢种连铸板坯和热轧板中Cu、As和Sn的富集行为进行了研究.实验结果表明:连铸坯中氧化层和氧化层/基体层界面存在Cu、As和Sn元素同时富集现象;热轧板氧化层/基体层界面存在Cu、As和Sn元素富集相,基体层中Cu、As和Sn含量高于氧化层;热轧板晶界处Cu、As和Sn含量明显高于热轧板晶内;Cu、As和Sn在γ晶界偏聚和Fe的优先氧化造成连铸坯中Cu、As和Sn富集,加热炉的二次加热加剧Cu、As和Sn的富集程度,引起Cu、As和Sn向钢材基体渗透扩散,使钢的塑性恶化,导致中板大量表面微裂纹缺陷.分析了Cu、As和Sn富集相对表面微裂纹的影响机理.
The enrichment behavior of Cu, As and Sn in continuous cast slabs and hot-rolled sheets of low alloy steels was investigated by scanning electron microscopy and X-ray energy dispersive X-ray spectroscopy (X-EDS). The experimental results show that continuous casting The Cu, As and Sn elements are enriched simultaneously at the oxide and oxide / matrix interface of the slab. Cu, As and Sn enrichment phases exist at the oxide / The content of Sn is higher than the oxide layer; the content of Cu, As and Sn in the hot-rolled sheet grain boundaries are obviously higher than those in the hot-rolled sheet; the segregation of Cu, As and Sn in γ grain boundaries and the preferential oxidation of Fe cause the Cu , As and Sn enrichment, heating furnace secondary heating exacerbated the enrichment of Cu, As and Sn, causing Cu, As and Sn to infiltrate the steel substrate penetration, the plastic deterioration of steel, resulting in a large number of surface micro-crack defects The mechanism of the relative surface microcracks of Cu, As and Sn enrichment was analyzed.