残余元素铜在中碳钢中的析出规律  

Copper precipitation behavior in medium carbon steel

作　　者：李岩[1] 宋波[1] 毛红[2] 潘宁[1] 赵晶[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国科技论文在线》2008年第11期849-852,共4页

基　　金：国家自然科学基金资助项目(50574009)

摘　　要：以中碳钢为研究对象,调整Mn,S含量,添加0.3%左右的铜作为残余元素,研究铜在钢中的偏析以及在夹杂物上的析出情况。利用扫描电镜及能谱仪研究发现当钢中锰含量从0.008%提高到0.094%时,可以减轻铜沿原奥氏体晶界的偏析程度。锰含量为0.440%时,铜在硫化锰夹杂上的析出比例可以达到94.6%,继续提高锰含量对提高铜的析出比例无益。通过二元匹配度的计算,可以得出,无论Cu在钢中以何种形式存在,MnS夹杂较氧化硅、氧化铝夹杂更适合铜析出,计算结果与实验结果吻合。In this study, about 0.30% copper is added into medium carbon steel as residual element, The content of manganese and sulfur is varied to investigate on their effect on copper precipitation in inclusion,and copper intergranular segregation on the grain boundary during cooling. When the manganese content is changed from 0.008% to 0.094%, the segregation of copper on the grain boundary is less. When the manganese content is 0.440%, the proportion of copper precipitation in manganese sulfide to the total sulfide is 94.6%. Further increase of the manganese content is not helpful for increasing the proportion of copper precipitation. The disregistry between the lattice parameters of the copper particles and the inclusions is calculated, which proves manganese sulfide is more favorable for copper precipitation than silicon oxide and aluminum oxide as inclusions.

关 键 词：偏析 铜析出 二元匹配度 中碳钢 铜 硫化锰夹杂 

分 类 号：TG142.31[一般工业技术—材料科学与工程]