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研究了高温加热对高硫车轮钢中MnS+Al_2O_3复合夹杂物结构与形态的影响。通过采用扫描电子显微(SEM)技术对高硫车轮钢中夹杂物的类型及尺寸进行了分析统计。结果表明:加热温度为1 300℃时,MnS回溶对MnS+Al_2O_3复合相的包裹效果没有产生显著地破坏作用。而当加热温度升至1 350℃后,由于大量的硫化物回溶,使不少氧化物夹杂物直接暴露于钢基体,破坏高硫钢中MnS+Al_2O_3复合相的包裹效果。在含硫车轮钢的热加工过程中,应该尽量降低处理温度(低于1 300℃)来降低MnS回溶对全包裹Al_2O_3复合夹杂物的破坏作用。
The effect of high temperature heating on the structure and morphology of MnS + Al_2O_3 composite inclusions in high sulfur steel was investigated. The types and sizes of inclusions in high-sulfur steel were analyzed by scanning electron microscopy (SEM). The results show that when the heating temperature is 1 300 ℃, the effect of MnS solution on the encapsulation of MnS + Al_2O_3 composite phase is not obvious. However, when the heating temperature was raised to 1 350 ℃, many oxide inclusions were directly exposed to the steel matrix due to the large amount of sulfide solution, which destroyed the encapsulation effect of MnS + Al 2 O 3 composite phase in high sulfur steel. In the thermal processing of sulfur-containing wheel steel, the treatment temperature should be reduced to as low as 1300 ℃ to reduce the destructive effect of MnS solution on the all-composite Al 2 O 3 composite inclusions.