宽厚比与模数对球墨铸铁件冒口有效补缩距离的影响  

Effect of Width Thickness Ratio and Modulus on Riser Effective Feeding Distance of Ductile Iron

作　　者：田宁 闫化锦 赵国旗 孟宪林[2] 

机构地区：[1]贵州工程应用技术学院机械工程学院,贵州毕节551700 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《铸造技术》2016年第10期2180-2183,2189,共5页Foundry Technology

基　　金：贵州省普通高等学校煤化工过程装备与控制创新团队资助项目(黔教合人才团队字[2015]73);贵州省科学技术厅;毕节市科学技术局;贵州工程应用技术学院科学技术联合基金资助项目(黔科合LH字[2015]7583);基于汽车车身NVH的刚度研究分析与应用资助项目(黔科合LH[2014]7527)

摘　　要：采用杆形件与板形件研究了宽厚比与模数对过共晶球墨铸铁件冒口有效补缩距离的影响。用着色腐蚀金相法显示了过共晶球铁中的奥氏体枝晶组织,观察了其形貌特征,以此分析了有效补缩距离与奥氏体枝晶组织的关系。结果表明,随铸件宽厚比的增大,过共晶球铁件冒口有效补缩距离减小,枝晶数量增多;随铸件模数的增加,有效补缩距离增大,枝晶数量减少,形态趋于不发达,由初生枝晶向晕圈枝晶过渡。凝固过程中形成的奥氏体枝晶的数量与形状的差异是造成球铁件冒口有效补缩距离大小不同的主要原因。The effect of width thickness ratio and modulus MC on riser effective feeding distance of hypereutectic ductile iron was studied using rod-shaped castings and strip-shaped castings.The structures of austenitic dendrites in hypereutectic ductile iron were displayed using coloration etching,and its appearance characteristic was observed to analyze the relations between effective feeding distance and structure of austenitic dendrites.The results indicate that,with the increase of the width thickness ratio,the effective feeding distance reduces,and the number of austenite dendrites increases.With the increase of the modulus MC,the effective feeding distance increases,the number of austenite dendrites reduces,the morphology of dendrites in hypereutectic ductile iron transforms from primary austenitic dendrite into shell dendrite.The difference of the number and the shape of austenite dendrites formed in solidification process is the main reason for the difference in riser effective feeding distance.

关 键 词：球墨铸铁 冒口有效补缩距离 宽厚比 模数 奥氏体枝晶 

分 类 号：TG255[金属学及工艺—铸造]