Influence of fading on characteristics of thermal analysis curve of compacted graphite iron  

作　　者：Liu Jinhai Yi Litao Li Guolu Liu Changqi Li Yinguo Yang Zhaoyu 

机构地区：[1]School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China [2]Tianjin Sabulance Probe Engineering Co. Ltd., Tianjin 300402, China

出　　处：《China Foundry》2011年第3期295-299,共5页中国铸造（英文版）

摘　　要：In general, during the production of compacted graphite iron (CGI), the active residual magnesium reduces and the effect of inoculation fades after magnesium treatment. In this paper, characteristics of the thermal analysis curve of CGI are compared with those of ductile iron and grey cast iron. The fading effect on the compacted graphite percentage and thermal analysis curve were also studied. Results indicate that the undercooling of CGI is as low as that of ductile iron, but CGI shows evident recalescence. In fading process, the magnesium element acts with oxygen. For a decrease in magnesium content, both the compacted graphite percentage and the austenitic liquidus temperature increase. The temperature of eutectic undercooling (TEU) decreases before the flake graphite appears. After that, TEU increases quickly, up to as high as 20℃, and then gradually decreases. The evolution of recalescence degree is opposite to that of TEU.In general, during the production of compacted graphite iron （CGI）, the active residual magnesium reduces and the effect of inoculation fades after magnesium treatment. In this paper, characteristics of the thermal analysis curve of CGI are compared with those of ductile iron and grey cast iron. The fading effect on the compacted graphite percentage and thermal analysis curve were also studied. Results indicate that the undercooling of CGI is as low as that of ductile iron, but CGI shows evident recalescence. In fading process, the magnesium element acts with oxygen. For a decrease in magnesium content, both the compacted graphite percentage and the austenitic liquidus temperature increase. The temperature of eutectic undercooling （TEu） decreases before the flake graphite appears. After that, TEU increases quickly, up to as high as 20℃, and then gradually decreases. The evolution of recalescence degree is opposite to that of TEu.

关 键 词：compacted graphite iron thermal analysis FADING compacted graphite percentage characteristicvalue 

分 类 号：TG143.49[一般工业技术—材料科学与工程]