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在高温钼丝炉内向16Mn钢中加入不同含量镧进行脱氧。利用SEM、EDS和OM测试并研究La含量对钢中夹杂物的成分、大小分布及试验钢组织的影响,并探讨了钢中含镧夹杂物诱发晶内针状铁素体形核机制。结果表明,随钢中镧含量增加,夹杂物依次转变为LaAlO3、La2O2S和La2S3。试样经镧处理后,钢液在1600℃时保温180 s,夹杂物最为细小且弥散。钢中晶内铁素体含量随镧含量增加先增大后减小,最佳镧含量约为0.014%(质量分数)。钢中含镧夹杂物周围形成贫Mn区,促进晶内针状铁素体形核。
In high-temperature molybdenum wire furnace to 16Mn different levels of lanthanum for deoxidation. SEM, EDS and OM were used to test and study the influence of La content on the composition, size distribution and microstructure of inclusions in steel. The mechanism of nucleation of acicular ferrite in inclusions containing lanthanum in steel was also discussed. The results show that with the increase of lanthanum content in the steel, the inclusions turn into LaAlO3, La2O2S and La2S3. After the sample was treated by lanthanum, the molten steel was incubated at 1600 ℃ for 180 s, the inclusions were the smallest and dispersed. The intragranular ferrite content first increases and then decreases with the increase of lanthanum content, and the optimal lanthanum content is about 0.014% (mass fraction). Steel containing lanthanum inclusions around the formation of poor Mn area, promote intragranular acicular ferrite nucleation.