摘要
为满足汽车底盘等关键部件在复杂工况下对高强度、高韧性球墨铸铁的需求,本研究聚焦于高牌号球墨铸铁的铸态生产工艺。通过系统优化合金元素(Cu、Sn)添加量、球化及孕育处理工艺,成功制备了混合基体(铁素体+珠光体)组织的高性能铸态球墨铸铁。研究表明:Cu(1.0wt.%)和Sn(0.05wt.%)元素的协同作用可显著改善基体组织中铁素体分布与珠光体结构,提高石墨球化率及圆整度,减少微渣倾向,并大幅提升材料性能稳定性。最终获得的铸态材料抗拉强度超过800 MPa,断后伸长率>5%,布氏硬度达258,综合性能优异,满足严苛服役要求。
To meet the requirements of high-strength and high-toughness ductile iron for key components of automotive chas⁃sis under complex working conditions,this study focused on the casting process of high-grade ductile iron.Through systematic opti⁃mization of the addition amounts of alloy elements(Cu,Sn),as well as the processes of spheroidization and eutectic treatment,high-performance cast ductile iron with a mixed matrix(ferrite+pearlite)structure was successfully prepared.The research shows that the synergistic effect of Cu(1.0 wt.%)and Sn(0.05 wt.%)can significantly improve the distribution of ferrite and the struc⁃ture of pearlite in the matrix,increase the graphite spheroidization rate and roundness,reduce the tendency of micro-fragments,and significantly enhance the stability of material properties.The final cast material obtained has a tensile strength exceeding 800 MPa,a post-fracture elongation rate>5%,a hardness of 258,and excellent comprehensive performance,meeting the strict service require⁃ments.
作者
喻高峰
YU Gao-feng(Shanxi Huaxiang Group Co.,Ltd.,Linfen Shanxi 04100,China)
出处
《铸造设备与工艺》
2025年第4期17-20,35,共5页
Foundry Equipment & Technology
关键词
球墨铸铁
高强度
混合基体
nodule cast iron
high strength
mixed matrix
