铈对16Mn钢中夹杂物和组织的影响

Effect of Cerium on Inclusions and Microstructure of 16Mn Steel

在高温钼丝炉内向16Mn钢中加入不同含量的铈进行脱氧,分析了钢中夹杂物和组织的变化,并探讨了含铈夹杂物诱发晶内铁素体形核的机制。结果表明:随钢中铈含量的增加,夹杂物依次转变为CeAlO3,Ce2O2S和Ce2S3。经铈处理后,钢液在1873 K时保温300 s,夹杂物最为细小弥散。钢中晶内铁素体随铈含量的增加而增加,但最佳的铈含量约为0.032%(质量分数)。钢中Ce2O2S和Ce2S3夹杂与α-Fe相之间的错配度分别只有1.2%和0.5%,均可作为IGF非常有效的形核核心,促进其形成。

The deoxidation experiments of 16Mn steel were carried out by adding different content of cerium in the high temperature molybdenum wire furnace.The transformation of inclusions and microstructure in steel were investigated,and the mechanism of intragranular ferrite induced by Ce-containing inclusions was also discussed.The results showed that the inclusions were in turn transformed with increasing of Ce as follows,CeAlO3,Ce2O2S and Ce2S3.The inclusions were the most finely distributed on condition holding 300 s at 1873 K after treated by Ce.The percentage of intragranular ferrite increased with increasing of Ce,but the optimum content of Ce was around 0.032%.The lattice disregistry between Ce2O2S,Ce2S3 and α-Fe phase were as small as 1.2% and 0.5%,respectively,both of them could act as very effective nucleus of intragranular ferrite to promote its formation.