铸造2025，Vol.74Issue(10)：1321-1328,8.
SiC颗粒促进球墨铸铁珠光体中Fe3C异质形核机理及其力学性能研究
Research on the Heterogeneous Nucleation Mechanism and Mechanical Properties of Fe3C in Ductile Iron Pearlite Promoted by SiC Particles
摘要
Abstract
This paper systematically studied the regulation mechanism of silicon carbide(SiC)pretreatment on the microstructure and properties of ductile iron.By combining first-principles calculations with experimental verifications,the mechanism by which SiC,as a heterogeneous nucleation site,promoting the nucleation of cementite(Fe3C)in pearlite was revealed.Theoretical calculations showed that the lattice mismatch rate at the interface between SiC(110)and Fe3C(100)was only 5.77％,and the interfacial bonding work reached 1.842 J/m2,confirming that the SiC can serve as an efficient nucleation substrate for the Fe3C.The experimental design included the addition of the SiC with additions ranging from 0 to 0.15 wt.％.The results showed that an appropriate addition(0.1 wt.％)significantly optimized the microstructure of the ductile iron,with a spheroidization rate of 93％,resulting in minimized pearlite lamellae spacing,and increased the tensile strength to 846 MPa.Through the synergistic effects of heterogeneous nucleation and promotion of carbon diffusion,the SiC effectively refined the spacing of pearlite sheets and enhanced the interfacial bonding,providing a theoretical basis and process optimization scheme for the high strength and toughening of as-cast ductile iron,and had significant application value.关键词
球墨铸铁/SiC颗粒/Fe3C/异质形核/第一性原理Key words
ductile iron/SiC particles/Fe3C/heterogeneous nucleation/first-principles分类
金属材料引用本文复制引用
张腾,游志勇,韩培德,宋振洋,韩嘉敏..SiC颗粒促进球墨铸铁珠光体中Fe3C异质形核机理及其力学性能研究[J].铸造,2025,74(10):1321-1328,8.基金项目
山西省吕梁市校地合作重点研发专项(2023XDHZ15). （2023XDHZ15）
