一种新型高强高塑性球墨铸铁的研究

Study on A New Type of High-Strength and High-Plasticity Ductile Iron

介绍了球墨铸铁的合金成分设计,阐述了高强高塑性球墨铸铁的制备方法。通过添加合金元素与痕量元素,改进球化孕育工艺,可提高球墨铸铁的球化率,细化石墨,使珠光体和铁素体得到合理搭配,在强度提高的同时得到高塑性,远高于对应的国家标准。该球墨铸铁在常温条件下抗拉强度达到750 MPa,屈服强度达到560 MPa,伸长率达到7.5%以上。

The design of the alloy composition of ductile iron was introduced, and the preparation method of high-strength and high-plasticity ductile iron was described in detail. The results show that, adding alloying elements and trace elements and improving the spheroidization process, the spheroidizing rate of theductile iron can be improved and the graphite refined. Thus, the pearlite and ferrite in the structure get a reasonable match, and the strength and plasticity are enhanced simultaneously, which are much higher than the corresponding national standards. The tensile strength of the ductile iron reaches 750 MPa at room temperature, the yield strength reaches 560 MPa, and the elongation is more than 7.5%.