振动对消失模铸造球墨铸铁石墨形态的影响  

Effect of Vibration on Graphite Morphology of Lost Foam Cast Ductile Iron

作　　者：宗晓明[1] 樊自田[1] 肖伯涛[1] 龙威[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《铸造》2011年第12期1205-1208,共4页Foundry

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA03Z113)

摘　　要：试验研究了振动对消失模铸造球墨铸铁试件石墨形态的影响,浇注阶梯试样,对比了厚度为20 mm、40 mm、60 mm试样,在静止凝固与振动凝固条件下的石墨形态变化。试验研究发现:振动可以显著增加石墨球的数目,随着试样厚度的增加,石墨球增加明显,当厚度为60 mm时,振动凝固与静止凝固相比,石墨球数量增加了50.7%;振动下凝固对石墨球的圆整度具有双重作用,振动凝固下的石墨球的圆整度低于静止凝固,随试样厚度的增加石墨球的圆整度增加;振动凝固显著地降低了粗大石墨的比例,有效地提高了石墨的均匀性。Mechanical vibration was applied to lost foam casting （LFC） process of ductile iron. The influence of mechanical vibration on different thickness specimens （20 mm, 40 mm, 60 mm） was investigated. The results show that the number of the graphite increases obviously with the increase in thickness in vibration condition; for the specimen with thickness of 60 mm, the number of graphite is increased by 50.7% compared with that in static solidification condition. Mechanical vibration has bilateral effect on the graphite. The roundness of graphite was lower in vibration condition than in static condition, but it increases as the thickness increases. Mechanical vibration reduced the proportion of coarse graphite, as a result, the graphite nodules distribute more uniformly.

关 键 词：石墨形态 球墨铸铁 振动 消失模铸造 

分 类 号：TG249.6[金属学及工艺—铸造]