中间体法兰D型石墨的形成机理及孕育处理的重要性  

Formation Mechanism of D-Type Graphite in Bearing Housing Flange and the Importance of Inoculation Treatment

作　　者：佘恺 王今胜 李赵 张小虎 SHE Kai;WANG Jin-sheng;LI Zhao;ZHANG Xiao-hu(CRRC Qishuyan Rolling Stock Research Institute Co.,Ltd.,Changzhou 213011,Jiangsu,China)

机构地区：[1]中车戚墅堰机车车辆研究所有限公司,江苏常州213011

出　　处：《铸造》2020年第9期919-923,共5页Foundry

摘　　要：中间体是涡轮增压器的重要组成部分,由于其特殊结构,在法兰薄壁位置容易形成D型石墨,影响中间体整体的力学性能。从热力学及动力学角度探讨了中间体法兰薄壁处D型石墨的形成机理,重点介绍了孕育处理促进石墨形核的机理,以及对改善薄壁D型石墨的作用,最后举例并概括了适合薄壁铸件的孕育剂种类。The bearing housing is an important part of turbocharger.Due to its special structure,D-type graphite is easy to form in the thin-walled position of flange,which affects the overall mechanical properties of the bearing housing.In this paper,the formation mechanism of D-type graphite in the thin wall of bearing housing flange is discussed from the point of thermodynamics and dynamics.The mechanism of promoting graphite nucleation by inoculation treatment and its effect on improving the D-type graphite are mainly introduced.Finally,the kinds of inoculants suitable for thin wall castings are illustrated and summarized.

关 键 词：中间体 D型石墨 热力学及动力学 形成机理 孕育处理 

分 类 号：TG251[金属学及工艺—铸造]