Formation Mechanism of Spheroidal Carbide in Ultra-Low Carbon Ductile Iron

摘要：

　　The formation mechanism of spheroidal carbide in ultra-low carbon ductile iron fabricated by metal mold casting technique was systematically investigated.The results demonstrated that the spheroidal carbide belongs to eutectic carbide and crystallizes 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 was also found that the amount of the spheroidal carbide would increase with an increase in carbon content.The cooling rate has an important influence on the spheroidal carbide under the same chemical composition condition.

关键词： ultra-low carbon ductile iron cooling rate nucleation core spheroidal carbides formation mechanism

作者: Bin-guo Fu Zhuo-qing Li Xue-bo Zhao Zhen Shen Guo-lu Li Jin-hai Liu

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

会议类型: 国内会议

会议名称: 第十二届中国铸造协会年会暨全球首届铸造论坛、第六届中国金砖国家铸造业论坛

会议地点: 北京

会议语种:英文

页码: 17-23

在线出版日期: 2016-05-14（万方平台首次上网日期，不代表论文的发表时间）