新一代汽车发动机蠕铁排气管的开发研究  

Production study on new generation of VG cast iron exhaust tube

作　　者：段汉桥[1] 袁福安[1] 魏伯康[1] 喻平[2] 武炳焕[2] 刘永安[2] 

机构地区：[1]华中科技大学材料学院,湖北武汉430074 [2]东风汽车公司铸造一厂,湖北十堰442048

出　　处：《汽车科技》2002年第3期13-16,42,共5页Auto Sci-Tech

摘　　要：通过微观组织分析和因素设计试验,研究了新一代汽车发动机中硅钼蠕铁排气管延伸率不足的原因和主要工艺因素对延伸率的影响。研究结果表明:造成排气管铸件延伸率不足的原因是钼、磷等碳化物形成元素向晶界偏析并生成晶界碳化物或复合磷共晶;影响排气管铸件延伸率的最主要的工艺因素是随流孕育。The reasons of low elongation of mid-Si-Mo vermicular graphite(VG) cast iron exhaust tube casting and the effects of main technology factors on the elongation are studied by microstructure analysis and factor design tests.The results of the study show that:the essential reason of low elongation of the castings is there are some molybdenum carbide and composite phosphide eutectic along the grain boundary;the most outstanding influencing factor on the elongation of the castings is stream inoculation technology.

关 键 词：汽车 发动机 蠕墨铸铁 排气管 延伸率 微观组织 因子试验设计方法 随流孕育 

分 类 号：U464.134.4[机械工程—车辆工程]