对于含有0.3%残余元素铜的中碳钢,在1100℃下氧化1800 s和3600 s,利用扫描电镜和能谱仪观察氧化层与钢基体界面处铜的富集析出情况.并分析S、Ti等元素含量对于残余元素铜在氧化层附近富集情况的影响.结果表明,钢中硫化锰夹杂物数量的增多有利于更多的铜在硫化锰上析出,从而有效减轻铜在钢氧化层的富集偏析以及浸润晶界现象.
The medium carbon steel with 0.3 mass% residual copper was oxidized at 1100 ℃ for 1800 s and 3600 s to obtain scal layer on the steel substrate.The microstructure at the interface between the scale layer and steel matrix was observed by using of SEM-EDX analysis,the copper enrichment and segregation along the interface was also examined.The effect of S and Ti content on the copper enrichment and segregation at the interface was discussed.The results show that copper precipitation on inclusions depends on the amount of manganese sulfur inclusions to a certain extent.Manganese sulfur inclusions are effective on decreasing the amount of copper enrichment and segregation at the interface,and reducing the surface cracking due to infiltrating of liquid copper to grain boundary.
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