通过金相显微镜、扫描电镜对车轮钢（CL50）铸态/热轧态和热处理态组织中夹杂物的形态分布进行研究,并利用能谱对夹杂进行成分分析。结果表明,在S含量极低的情况下,CL50车轮钢中氧化物夹杂主要呈球形或多边形,随机分布,在轧制过程中不发生变形;增大S含量,铸态组织中开始出现球状、串珠状以及条状MnS-氧化物复合夹杂物,且有在晶界聚集的趋势,主要分布于网状铁素体或者孤岛铁素体中;热处理后夹杂物则分布于网状铁素体中,说明夹杂物在一定程度上促进铁素体的形核。在890℃热处理过程中夹杂物形态和分布没有明显变化。
Effect of heat treatment on morphology and distribution of inclusions in wheel steels（CL50）was investigated by metallographic microscope,SEM and EDS.The results show that the oxide inclusions in the steel with low sulphur content are spheroidal and polygonal random distributing in the steel and no deformation occurs during rolling.Increasing sulphur content,spheroidal,strip and beaded MnS-oxide inclusions are observed in the cast steel,tending to distribute in the network ferrite at grain boundary and the island-like ferrite in pearlite.In the heat treated steel,the inclusions prevail in the network ferrite at grain boundary.Austenitizing at 890 ℃ has no significant effect on morphology and distribution of the inclusions.
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