硅固溶强化铁素体球铁的凝固组织形貌及晶间析出相分析  

Analysis of Solidification Microstructure and Cell Boundary Precipitates of Si Solution Strengthened Ferritic Ductile Iron

作　　者：翟秋亚[1] 全真 徐锦锋[1] 赵新武 何宝楼 ZHAI Qiuya;QUAN Zhen;XU Jinfeng;ZHAO Xinwu;HE Baolou(School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China;Xixia Intermal Combustion Engine Intake and Exhaust Pipe Co.,Lud.,Xixia 474500,China)

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]西峡县内燃机进排气管有限责任公司,河南西峡474500

出　　处：《铸造技术》2021年第8期651-655,共5页Foundry Technology

基　　金：陕西省教育厅科研服务地方专项(17JF022)。

摘　　要：硅固溶强化铁素体球铁是一种生产工艺简单而力学性能优良的工程材料。借助着色腐蚀方法,在较宽的硅含量范围内,研究了硅固溶强化铁素体球铁的凝固组织演变规律及常见晶界析出相。结果表明,硅固溶强化铁素体球铁的凝固组织由(石墨+奥氏体)共晶团及发源于奥氏体壳的少量的晕圈枝晶组成。随着碳当量的增大,球化率降低,球数减少,球径增大.晕圈枝晶数量减少。凝固末期的残余铁液富含Ti、Mo、Mn、Cr和O元素,经最后凝固形成少量形态不规则的合金碳化物、氧化物、硅铁化合物等物相。Si solution strengthened ferritic ductile iron is a kind of engineering material with simple production process and excellent properties. The solidification microstructure evolution and common precipitates at eutectic cell boundary of Si solution strengthened ferritic ductile iron in a wide range of silicon content were studied by means of coloring etching method. The results show that solidification structure of Si solution strengthened ferritic ductile iron is composed of eutectic cells( graphite + austenite) and a small of amount of halo dendrite original from austenite shell. With the increased carbo equivalent,the nodularity,nodule count,nodule size and the number of halo dendrites decreased. At the end of solidification,the residual liquid is rich in Ti,Mo,Mn,Cr and O elements. At last solidification,a small amount of amorphous alloy carbides,oxides and ferrsilicate compounds are formed.

关 键 词：硅固溶强化 铁素体球铁 凝固组织 晶间析出相 

分 类 号：TG244[金属学及工艺—铸造]