新型中铬强韧抗磨铸铁的研制

微合金化复合变质处理使中铬铸铁基体组织和共晶碳化物细化，使网状碳化物局部断开，与高铬铸铁相比基体的连续性得以提高，从而提高了中铬铸铁的韧性，同时复合变质处理有效地控制了残留奥氏体量，提高了淬透性，使铸件铸态硬度高达59HRC，不仅简化了热处理工序，而且有利于铸件尺寸稳定和耐磨性能的提高，实践证明微合金化复合变质处理中铬铸铁磨球使用寿命与高铬铸铁磨球相当，成本却降低40％，冲击韧度提高2倍，破碎率仅为高铬铸铁磨球的1／4。

Research on Strength-toughness and Wear-resistance Cast Iron with Medium Chromium

By the process of microalloy compound modification,both matrix structure of cast iron with the medium chromium and eutectic carbides are refined,the net carbides partially interrupted,the homogeneity of matrix improved than that of cast iron with high chromium,so the toughness of cast iron with medium chromium is improved.Meanwhile the process controls effectly the content of residual austenitic,hardenability is raised,and hardness of the cast iron can be reached 59HRC.It not only simplifies the process of heat treatment,but also raises the size stability and wear resistance of cast iron.The service life of cast iron with midium chromium is about equal to that of cast iron with high chromium,However the cost lowers 40%,the impact toughness raises two times,and the rate of crumbling is only 25% of that of cast iron with high chromium.