Development of new ductile iron with super-high thermal conductivity and elongation

作     者：Guang-hua Wang Yan-xiang Li Guang-hua Wang;Yan-xiang Li

作者机构：School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Key Laboratory for Advanced Materials Processing TechnologyMinistry of EducationBeijing100084China 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2022年第29卷第3期

页      面：462-473页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors gratefully acknowledge Y.F. Zhao  D.C. Li and M.Y. Liu for technical support on the sample environment. We also thank X. Chen  Y. Liu  and H.W. Zhang for helpful discussion during this investigation 

主　　题：Thermal conductivity Ductile iron Elongation Tensile strength Silicon alloying 

摘      要：The effects of Si content,graphite volume fraction and pearlite volume fraction on the thermal conductivity of ductile iron were studied based on theoretical model *** results showed that the thermal conductivity of ductile iron was more sensitive to Si content compared with the volume fractions of pearlite and *** key method to design and develop high thermal conductivity ductile iron was to control the Si *** 0.9-2.2 wt.%Si content,experimental results showed that with the increase in Si content,the thermal conductivity of ductile iron decreased dramatically,and the yield strength and tensile strength of ductile iron almost linearly increased,but the elongation remained almost *** dependence of thermal conductivity of ductile iron on temperature changed from monotonic decreasing to increasing first and then ***,we broke the common composition range of ductile iron and designed a new high C(≥3.9 wt.%)and low Si(1.0-1.4 wt.%)ductile iron with super-high thermal conductivity and *** thermal conductivity exceeded 40 W/(m K)within 27-300℃,and maintained at 35-40 W/(m K)at 500℃.The elongation was over 25%,and the tensile strength was more than 300 MPa.