Gray Cast Iron With Directional Graphite Flakes Produced by Cylinder Covered Compression Process  

作　　者：ZHAO Xin WANG Jin-feng JING Tian-fu 

机构地区：[1]The Sixth Department, Zhengzhou Institute of Aeronautics, Zhengzhou 450015, Henan, China [2]State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China

出　　处：《Journal of Iron and Steel Research International》2007年第5期52-55,共4页

基　　金：Item Sponsored by National Natural Science Foundation of China (50271060 ,50371074) ;Natural Science Foundation of Hebei Province of China (503291)

摘　　要：A new plastic deformation process for gray cast iron named cylinder covered compression （CCC） was developed. By CCC process, gray cast iron （GCI） specimens, which are embedded in steel cylinders, were hot compressed up to 80% reduction in height without the cracking problem. It was clearly observed that the uniform distribution of directional graphite flakes appeared after more than 45 % reduction hot compression. The strength, ductility, and microhardness of GCI after 80% reduction deformation were significantly enhanced： the tensile strength varied from 117 MPa to 249 MPa, while the total elongation varied from 0 to 5.2%, and the microhardness varied from 153 HV to 217 HV. It was shown that the tensile fracture surface presented ductility characters after more than 45% reduction hot deformation.A new plastic deformation process for gray cast iron named cylinder covered compression （CCC） was developed. By CCC process, gray cast iron （GCI） specimens, which are embedded in steel cylinders, were hot compressed up to 80% reduction in height without the cracking problem. It was clearly observed that the uniform distribution of directional graphite flakes appeared after more than 45 % reduction hot compression. The strength, ductility, and microhardness of GCI after 80% reduction deformation were significantly enhanced： the tensile strength varied from 117 MPa to 249 MPa, while the total elongation varied from 0 to 5.2%, and the microhardness varied from 153 HV to 217 HV. It was shown that the tensile fracture surface presented ductility characters after more than 45% reduction hot deformation.

关 键 词：gray cast iron hot working tensile strength ELONGATION HARDNESS 

分 类 号：TG31[金属学及工艺—金属压力加工]