喂丝球化处理工艺在高Si-Mo球铁件中的应用  

The Application of Injection Feeding Spheroidization in High Si-Mo Content Ductile Iron Castings

作　　者：莫俊超 张尊乐 贺春 马琦 

机构地区：[1]常州南车汽车零部件有限公司,江苏常州213011

出　　处：《现代铸铁》2015年第4期22-25,共4页Modern Cast Iron

摘　　要：介绍了喂丝球化处理工艺的原理及优点,以某排气连接管为例,详细阐述了喂丝法工艺在高Si-Mo球墨铸铁件中的应用,通过与冲入法工艺进行对比可知,采用喂丝法工艺生产的铸件球化率为30%Ⅰ＋60%Ⅱ,基体组织为10%珠光体＋90%铁素体,无碳化物;而冲入法的球化率最高达到85%,最低的只有80%,基体组织为10%珠光体＋90%铁素体,无碳化物;采用喂丝法工艺的铸件力学性能的波动范围比冲入法小,抗拉强度625～631 MPa,屈服强度485~491 MPa,伸长率10%~12%,硬度205~210 HBW。The principles and advantages of injection feeding spheroidization was introduced. A exhaust connection pipe was taken as an example. The application of injection feeding spheroidization in high Si-Mo content ductile iron castings was elaborated. For comparison,this injection feeding spheroidization nodularity was 30% I ＋60% II and the microstructure were 10% pearlite＋90% ferrite without carbide. While the pour-over process nodularity rate was 85% at best,even 80% at worst. The microstructure were the same. The casting mechanical properties produced by injection feeding spheroidization had a narrow fluctuation range. The tensile strength of that was 625-631 MPa,yield strength was 485-491 MPa,elongation was 10% -12% and hardness was 205-210 HBW.

关 键 词：球墨铸铁 喂丝球化工艺 冲入法 球化率 

分 类 号：TG255[金属学及工艺—铸造]