Formation Mechanism of the spheroidal Carbide in the Ultra-Low Carbon Ductile Iron

摘要：

　　The formation mechanism of the spheroidal carbide in the ultra-low carbon ductile iron fabricated by the metal mold casting technique was systematically investigated.The results demonstrated that the spheroidal carbide belonged to eutectic carbide and crystallized in the isolated eutectic liquid phase area.The formation process of the spheroidal carbide was related to the contact and the intersection between the primary dendrite and the secondary dendrite of austenite.The oxides of magnesium,rare earth and other elements can be acted as heterogeneous nucleation site for the spheroidal carbide.It is also found that the amount of the spheroidal carbide would increase with the increase of the carbon content.The cooling rate had an important influence on the spheroidal carbide at the same chemical composition condition.

关键词： The ultra-low carbon ductile iron Cooling rate Nucleation core Spheroidal carbides Formation mechanism

作者: LI Zhuo-qing FU Bin-guo ZHAO Xue-bo SHEN Zhen LI Guo-lu LIU Jin-hai

作者单位: School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China chool of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China

会议类型: 国际会议

会议名称: 2016WFO、铸铁、铸钢技术国际论坛

会议地点: 北京

会议语种:英文

页码: 1-8

在线出版日期: 2016-05-18（万方平台首次上网日期，不代表论文的发表时间）