摘要
利用全废钢增碳技术,严格控制铁液中的硫、磷含量;通过加入微量合金化元素和加强球化与孕育处理等工艺措施,实现铸态下生产QT750-5高强度高韧性球墨铸铁。试验表明:采用废钢增碳生产的合成铸铁,只要选择合适的化学成分,控制基体组织中珠光体与铁素体量的比例,其铸态抗拉强度超过750 MPa,断后伸长率大于5%。
QT750-5 synthetic ductile iron with high strength and high toughness was manufactured by means of full scrap carburizing technology via strict controlling the content of sulfur and phosphorus, adding small amounts of alloying elements and strengthening spheroidization and inoculation treatment, and the microstructure and mechanical properties of the as-cast synthetic ductile iron were investigated. Based on the control of a suitable chemical composition and the proportion of pearlite and ferrite in matrix, the ultimate tensile strength of the as-cast synthetic ductile iron is greater than 750 MPa and the elongation is higher than 5%.
出处
《铸造技术》
CAS
北大核心
2013年第5期538-540,共3页
Foundry Technology
关键词
铸态
强韧性
合成球铁
废钢增碳
as-cast
strength and toughness
synthetic ductile iron
carburization
