摘要
为提高球墨铸铁的力学性能,采用消失模法浇注铜质量分数不同的球墨铸铁试样,利用金相显微镜观察球铁试样的微观组织,结合硬度和拉伸实验,分析Cu加入量对球铁微观组织和力学性能的影响,并通过扫描电镜拍摄试样的断口形貌,探寻Cu质量分数与球墨铸铁石墨形态及分布的内在联系。结果表明:随着铜质量分数的上升,珠光体数量逐渐增多。当铜质量分数为0.8%时,球铁试样的石墨形态较好,塑性、硬度和强度最佳,具有较高的力学性能。
This paper is aiming at improving the mechanical properties of the ductile cast iron by preparing three-component ductile cast iron castings with different copper mass fraction using the lost foam casting method. The research involves observing microstructure of ductile iron sample using metallographic microscope; analyzing the effect of Cu on the microstructure and mechanical properties of the ductile cast iron,combined with hardness and tensile test; and observing the fracture morphology of the specimen by scanning electron microscope and thereby exploring the internal relationship between graphite morphology and distribution of Cu and nodular cast iron. The results show that pearlite has a gradually increasing number depending on an increased copper mass fraction and the copper mass fraction of 0. 8% gives ductile iron sample a better graphite morphology,and a higher plasticity,hardness,strength and mechanical property.
出处
《黑龙江科技大学学报》
CAS
2017年第6期674-678,共5页
Journal of Heilongjiang University of Science And Technology
关键词
球墨铸铁
CU
显微组织
力学性能
ductile cast iron
Cu
microstructure
mechanical properties
