孕育增硅对铁素体球铁微观组织及力学性能的影响  

Effects of Microstructures and Mechanical Properties of Ferritic Ductile Iron by Increasing Inoculation Content

作　　者：全真 徐锦锋[1] 赵新武 何宝楼 翟秋亚[1] QUAN Zhen;XU Jinfeng;ZHAO Xinwu;HE Baolou;ZHAI Qiuya(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China;Xixia Internal Combustion Engine Intake and Exhaust Pipe Co.,Ltd.,Xixia 474500,China)

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]西峡县内燃机进排气管有限责任公司,河南西峡474500

出　　处：《铸造技术》2021年第5期333-336,共4页Foundry Technology

摘　　要：在其它工艺因素不变的条件下,研究了孕育增硅处理对铁素体球铁微观组织和力学性能的影响规律。结果表明:随着孕育硅量的增加,石墨球化率下降,球径增大,球数减少,分布均匀性变差,尤其当Si含量大于4.0%时,容易产生碎块状石墨,且有加剧之倾向;同时,球铁的抗拉强度、屈服强度及硬度趋于增大,而伸长率呈现出先增大而后减小的趋势,冲击韧度则单调下降。The effect of inoculation and silicon addition treatment on microstructure and mechanical properties of ferrite ductile iron was studied under the condition of other technological factors unchanged.The results show that with the increase of inoculation amount of silicon,the graphite spheroidization rate decreases,the diameter of the spheroidization increases,the number of the spheroidization decreases,and the distribution uniformity becomes worse.Especially when the Si content is greater than 4.0%,it is easy to produce lumpy graphite and tends to intensify.At the same time,the tensile strength,yield strength and hardness of ductile iron tend to increase,while the elongation first increases and then decreases,and the impact toughness decreases monotonically.

关 键 词：硅含量 固溶强化 铁素体球铁 微观组织 力学性能 

分 类 号：TG243[金属学及工艺—铸造]