重轨钢中硫化锰夹杂物粒度的原位统计分布分析

摘要

The size distribution of MnS inclusion in casting block of heavy rail steel was processed by original position statistic distribution analysis method.The MnS inclusion size distribution curve was established by the statistics acquired with ASPEX scanning electron microscope-energy disperse spectroscopy(SEM-EDS),the MnS inclusions with the size of 5-10 μm,10-20 μm,20-50 μm were analyzed,respectively.The results of the samples for the test have shown that the MnS inclusions with the size of 5-10 μm were existed in the casting block all the time,however,the ratio of MnS inclusions with the size of 10-20 μm and 20-50 μm have reduced from the interior to edge,until the terminal of the casting block,the large inclusions were almost disappeared.The results by original position statistic distribution analysis method were compared with ASPEX SEM-EDS,both of them on the tendency of inclusion distribution were coincident,which illustrated the method of reacting inclusion distribution was reliable.%采用原位统计分布分析技术对重轨钢铸坯中MnS夹杂的粒度分布情况进行了分析研究.通过ASPEX扫描电镜-能谱仪(SEM-EDS)将重轨钢中不同尺寸的MnS夹杂进行统计,建立了原位统计分布分析MnS夹杂的粒度分布曲线,分别对重轨钢铸坯中5~10、10~20、20~50 μm的MnS夹杂的分布情况进行了统计分析.结果表明,沿着铸坯的内部到边缘的方向上,5~10 μm小颗粒夹杂一直存在,10~20、20~50 μm大颗粒MnS夹杂所占比例降低,直到铸坯边缘,几乎没有大颗粒MnS夹杂存在.将该结果与ASPEX扫描电镜-能谱仪得到的结果相比较,两者在反应夹杂物分布趋势上具有一致性,说明原位统计分布分析技术分析铸坯中夹杂物的粒度分布方法的建立具有可靠性.