论文部分内容阅读
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。
In the high temperature molybdenum wire furnace, 16Mn steel was added with different content of cerium for deoxidation. The changes of inclusions and microstructure in the steel were analyzed. The mechanism of intracrystalline ferrite nucleation induced by cerium-containing inclusions was also discussed. The results show that inclusions turn into CeAlO3, Ce2O2S and Ce2S3 with the increase of cerium content in the steel. After cerium treatment, the molten steel was incubated at 1873 K for 300 s, with the smallest inclusions dispersed. The intragranular ferrite increases with increasing cerium content, but the best cerium content is about 0.032% (mass fraction). The mismatch between Ce2O2S and Ce2S3 inclusions and α-Fe phase in steel is only 1.2% and 0.5% respectively, which can be regarded as a very effective core of IGF to promote their formation.