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本文从金相定量和定性方面来研究在转炉的工业生产条件下,稀土元素对60Si2Mn钢夹杂物的影响。通过光学显微镜观察,扫描电镜能谱分析,电子探针和电解夹杂分析表明:当钢中[RE]:[S]大于2时,钢中夹杂物为β-RE_2S_3、Υ-RE_2S_3,RE_2O_3S和REAlO_3等稀土夹杂物,延伸的硫化锰夹杂基本消失。在转炉生产的60Si2MnRE钢中没有发现单一的稀土氧化物、稀土硫化物和稀土中间相。当稀土加入量为0.15％时,钢的纯洁度受到影响。通过Leitz T,A,s,图像仪对夹杂物的几何特征定量测定表明:加稀土后,夹杂物的形状系数L/D趋近于1,夹杂物近于球形。由于稀土改变了夹杂物的类型、组成、形态和分布,因而60Si2MnRE钢的疲劳寿命比60Si2Mn钢高30％至一倍。
In this paper, metallurgical quantitative and qualitative aspects to study the industrial conditions in the converter, rare earth elements on the impact of 60Si2Mn steel inclusions. The results of optical microscopy, scanning electron microscopy, electron probe and electrolysis analysis show that the inclusions in the steel are β-RE_2S_3, γ-RE_2S_3, RE_2O_3S and REAlO_3 when the [RE]: [S] Other rare earth inclusions, extended manganese sulfide inclusions disappeared. No single rare earth oxides, rare earth sulfides and rare earth mesophases were found in the 60Si2MnRE steel produced in the converter. When the amount of rare earth added 0.15%, the purity of steel affected. By Leitz T, A, s, the quantitative determination of the geometric features of inclusions by the imager shows that the shape factor L / D of inclusions approaches 1 and the inclusions are nearly spherical. As rare earth changes the type, composition, morphology and distribution of inclusions, the fatigue life of 60Si2MnRE steel is 30% to 60% higher than that of 60Si2Mn steel.