蠕墨铸铁件明暗网状嵌套纹路的成因分析  

Analysis of the Causes of the Bright and Dark Mesh Nesting Pattern on Vermicular Graphite Iron

作　　者：姜爱龙 房夺 孙玉成 刘庆义 田普昌 JIANG Ai-long;FANG Duo;SUN Yu-cheng;LIU Qing-yi;TIAN Pu-chang(Weichai Power Co.,Ltd.,Weifang 261061,China)

机构地区：[1]潍柴动力股份有限公司,山东潍坊261061

出　　处：《现代铸铁》2018年第5期17-22,共6页Modern Cast Iron

基　　金：2016年度工信部智能制造专项(装备复杂零部件个性化快速定制智能制造新模式);2017年度泰山产业领军人才项目(发动机关键铸件数字化快速制造技术开发及产业化)

摘　　要：针对蠕墨铸铁件加工过程中出现的明暗网状嵌套纹路,从蠕墨铸铁件加工后的显微组织、显微硬度、微区成分等方面进行探讨和分析,结果表明:(1)蠕墨铸铁加工表面明暗网状嵌套纹路是由珠光体体积分数、共晶团大小和数量以及蠕虫状石墨的分布特点造成的,共晶团边界具有不完整、断续分布的特点;(2)网状嵌套纹路是共晶团组织在宏观形态下的外在表现,共晶团边界处石墨含量少、硬度高,加工后为加工面的高点,颜色宏观发亮,共晶团内部石墨含量高、硬度低,加工后为加工面的低点,颜色发灰。Aimed on the bright and dark mesh nesting lines appearing during the processing of vermicular graphite iron parts,the microstructure,microhardness and micro-area composition of the vermicular graphite iron castings were discussed and analyzed.The results showed that:(1)The bright and dark mesh nesting lines on vermicular graphite iron was caused by the pearlite volume fraction,the size and number of eutectic groups and the distribution characteristics of the vermicular graphite.The eutectic boundary had the characteristics of incomplete and intermittent distribution.(2)The mesh nesting pattern was the external representation of the eutectic structure in the macroscopic form.The eutectic group boundary had less graphite content and high hardness.After processing,it was the high point of the processing surface with macroscopically bright color.In the eutectic group,graphite content was high and the hardness was lower.After processing,it was the lower point of the processing surface and the color was gray.

关 键 词：蠕墨铸铁 网状嵌套纹路 共晶团 

分 类 号：TG143.49[一般工业技术—材料科学与工程]