Effects of alloy elements on ductility and thermal conductivity of compacted graphite iron  

作　　者：Dong-mei Xu Gui-quan Wang Xiang Chen Yan-xiang Li Yuan Liu Hua-wei Zhang 

机构地区：[1]School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China [2]Key Laboratory for Advanced Materials Processing Technology (MOE), Tsinghua University, Beijing 100084, China

出　　处：《China Foundry》2018年第3期189-195,共7页中国铸造（英文版）

摘　　要：The infl uence of Si, Sn, Mo and Ni on the ductility and thermal conductivity of compacted graphite iron(CGI) was investigated. Metallographic observation and Differential Scanning Calorimetry(DSC) experiments were carried out to analyze the roles of various additions in the eutectoid reaction. The experimental results showed that the ductility of CGI is proportional to the ferrite fraction, so moderate Si content could dramatically improve the ductility by increasing the ferrite fraction. DSC measurements showed that Mo has moderate inhibition on eutectoid transformation during both the heating and cooling processes, while the sample without Sn obviously broadens the three-phase region. Vermicularity and ferrite are known to improve thermal conductivity, and the former plays a more important role. Besides, among the alloy elements investigated, Sn has the greatest negative effect on conductivity, followed by Ni and Mo having the smallest effects.The influence of Si, Sn, Mo and Ni on the ductility and thermal conductivity of compacted graphite iron （CGI） was investigated. Metallographic observation and Differential Scanning Calorimetry （DSC） experiments were carried out to analyze the roles of various additions in the eutectoid reaction. The experimental results showed that the ductility of CGI is proportional to the ferrite fraction, so moderate Si content could dramatically improve theductility by increasing the ferrite fraction. DSC measurements showed that Mo has moderate inhibition on eutectoid transformation during both the heating and cooling processes, while the sample without Sn obviously broadens the three-phase region. Vermicularity and ferrite are known to improve thermal conductivity, and the former plays a more important role. Besides, among the alloy elements investigated, Sn has the greatest negative effect on conductivity,followed by Ni and Mo having the smallest effects.

关 键 词：COMPACTED GRAPHITE IRON DUCTILITY thermal CONDUCTIVITY 

分 类 号：TG143.2[一般工业技术—材料科学与工程]