摘要
以生铁、硅铁、废钢以及增碳剂等为主要原料,以Mo、Ni、V以及Nb作为合金化元素制备了汽车发动机缸体用铸铁材料,采用砂型铸造并进一步进行热处理获得样品,对其进行力学及耐磨性试验。试验结果显示:当Mo和Nb添加量为0.16%,Ni添加量为0.3%时,各项性能较优,能够获得较好的综合性能,此时铸铁材料样品的抗拉强度为315.6 MPa,显微硬度为223 HB,冲击功为7.6 J/cm^(2),磨损60 min后磨损量为0.089 g,热疲劳寿命为985次。合金元素的加入可以使铸铁内部珠光体组织片间距减小,同时可以细化石墨,形成细小的石墨团,部分合金元素可在基体中产生固溶强化作用。
The material of cast iron for automobile engine cylinder block was prepared with the main raw materials of pig iron, silicon iron, scrap steel and carburizing agent and the alloying element of Mo, Ni, V and Nb. The samples are obtained by sand casting and heat treatment, and then mechanical and wear resistance tests are conducted. The experimental results show that a good comprehensive performance can be achieved with 0.16% addition of Mo and Nb and 0.3% addition of Ni. Accordingly, the tensile strength of prepared cast iron sample is 315.6 MPa, the microhardness is 223 HB, the impact work is 7.6 J/cm^(2), the 60 min-wearing abrasion is 0.089 g, and the thermal fatigue life is 985 cycles. The addition of alloying element reduces the gap of pearlite tissue slice spacing in cast iron, and refines the graphite and forms a fine graphite group. In addition, some alloying elements can produce solid solution strengthening effect in the matrix.
作者
冯松
祖润青
何怡
FENG Song;ZU Runqing;HE Yi(Jiangsu Union Technical Institute Changzhou Liu Guojun Branch,Changzhou 213025,China;Wuxi Yingjie Automobile Technology Co.,Ltd.,Wuxi 214063,China;College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu 610059,China)
出处
《车用发动机》
北大核心
2021年第6期54-58,共5页
Vehicle Engine
基金
2018年江苏省教育信息化研究立项课题(20180108)
江苏省社会科学基金项目(19JYB012)。
关键词
微合金化
发动机
气缸体
材料性能
微观组织
microalloying
engine
cylinder block
materials property
microstructure