【摘要】 研制了一种新型含锡易切削钢.在锡含量小于0.05％(质量分数)时,钢材具有良好的易切削性能,其力学性能也达到了国家标准.在扫描电镜下观察了钢中夹杂物和断口的形貌,利用能谱分析了夹杂物的成分.结果表明,钢中的复合夹杂物主要由氧化物和MnS组成.多数呈球形或纺锤形,在断口及夹杂物的表面上锡明显偏析.更多还原

【Abstract】 A free cutting steel containing tin less than 0.05% in mass fraction was developed, which possesses good machinability and satisfactory mechanical properties meeting the national standard of China. The forms and distribution of inclusions and tin in the steel were investigated by observations of the steel samples and the fracture of the mechanical testing samples by means of SEM and EDS. The results showed that the complex inclusions, nodular or spindle-shaped, were composed mainly of oxides and mangnese sulphide. It was found that there were marked segregation of tin in the fracture and on the surfaces of inclusions in the steel.更多还原