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对现场和实验室冶炼的8炉低碳高硫易切削钢进行切削试验,同时对钢中的非金属夹杂物进行评级和SEM及DES能谱分析。结果表明:无论钢中是否含有锡等易切削元素,低碳高硫易切削钢的刀具磨损量均随钢中B+C类氧化物夹杂级别的增高而明显增加;钢中存在的氧化物夹杂主要为硬质Al2O3-MnO和MnO-SiO2、2MnO-SiO2型氧化物,可加剧切削过程的刀具磨损。钢中氧含量和氧化物夹杂级别相对较低时,适当提高氧含量可促使有利形态的MnS生成而使可切削性能得到改善;当氧含量高时,钢中氧化物夹杂级别明显提高,从而导致可切削性能的明显恶化。
Eight cutting furnaces of low carbon and high sulfur free-cutting steel were smelted on site and in laboratory, and the non-metallic inclusions in steel were rated and analyzed by SEM and DES. The results show that the tool wear of low-carbon and high-sulfur free-cutting steel increases with the increasing of the B + C-type oxides in the steel regardless of whether the steel contains free-cutting elements such as tin or not. The oxide inclusions Mainly hard Al2O3-MnO and MnO-SiO2, 2MnO-SiO2 type oxide, can exacerbate cutting tool wear. When the content of oxygen in steel is relatively low and the level of oxide inclusions is relatively low, appropriate increase of oxygen content can promote the formation of MnS with favorable morphology to improve machinability. When oxygen content is high, the level of oxide inclusions in steel increases obviously, Significant deterioration of machinability.