采用磨损试验机、金相显微镜,研究热处理工艺对含硼球墨铸铁(CADI)组织和力学性能的影响。结果表明,经960℃高温预处理7 min、900℃奥氏体化保温90 min及等温淬火保温90 min后,铸铁组织由球状石墨、针状铁素体、高碳残余奥氏体和一定量的碳化物组成。随着等温淬火温度由250℃升至310℃,铁素体组织粗化,残余奥氏体含量逐渐增加,硬度降低,冲击性能提高,耐磨性能降低。 Wear test machine and optical microscope were used to study the effect of heat treatment on microstructure and mechanical properties of boron-containing ductile iron (CADI). The results show that the microstructure of the cast iron consists of spherical graphite, acicular ferrite, high-carbon retained austenite, and a certain amount of austenite after pre-treatment at 960 ℃ for 7 min, austenite holding at 900 ℃ for 90 min and isothermal quenching for 90 min. Of the carbide composition. With the temperature of isothermal quenching increased from 250 ℃ to 310 ℃, the ferrite microstructure becomes coarse, the content of retained austenite gradually increases, the hardness decreases, the impact properties improve, and the wear resistance decreases.