研究了不同稀土加入量的高硫钢铸态和热处理后硫化物的形貌及耐磨性, 采用定量金相法分析了硫化物的尺寸和分布。结果表明: 加入质量分数为0.15%的稀土后, 高硫钢铸态组织中的硫化物为MnS、CrS和FeS的复合夹杂, 夹杂物的尺寸最小; 其在860 ℃淬火后, 晶内硫化物呈球形, 晶界硫化物呈长条状和纺锤状, 且硫化物尺寸明显减小; 在200 ℃低温回火后具有较好的耐磨性。

The morphology of sulfides and abrasive resistance of the as-cast and heat treated high sulfur steel with different amounts of RE were studied, and the size and distribution of sulfides were analyzed by quantitative metallography. The results show that the sulfides in as-cast structure of high sulfur steel with 0.15wt% RE were composed of MnS, CrS and FeS, the size of inclusion was smallest, the spherical sulfides in transgranular and long-stripe-like and spindle sulfides in grain boundaries were found after quenching at 860 ℃, and the size of sulfide obviously reduced. The abrasive resistance of high sulfur steel with 0.15wt% RE was fairly well after tempering at 200 ℃。