S含量对高速车轮钢性能和夹杂物的影响

Effect of Sulfur Contents on Properties and Inclusions in High Speed Wheel Steels

研究了S含量对高速车轮钢性能和夹杂物的影响.借助扫描电镜（SEM）对车轮钢中MnS,Al2O3等夹杂物进行了观察和统计分析,结果表明：随着S质量分数的增加（0.002％～0.014％）,车轮钢的强度基本保持同一水平但冲击韧性先增加后降低,在S质量分数为0.011％时韧性最优.其原因在于S含量的增加可以有效地促进塑性较好的MnS对硬性的Al2O3相的包裹,从而改善钢的韧性；但S含量过度增加则导致MnS量过多,反而对韧性不利.

Effect of different contents of sulfur on the properties and inclusions in the high speed wheel steels was in- vestigated. Inclusions （MnS, Al2O3） in the high speed wheel steels were observed by scanning electron microscopy （SEM） and statistically analyzed. The results show that, the impact toughness of the wheel steels increases with the ascending of sulfurs （0. 002%-0. 014%） at the beginning and gets the maximum at 0. 011% then descends, while the strength remain almost the same level. The reason is that the increasing of the sulfur contents can effectively promote the covering ablity of MnS to Al2O3, which is good to the toughness of steels. However, too large content of sulfur is harm to the toughness of the wheel steels, for the excessive amount of MnS is got in this case.