Fabrication High Homogeneous NbTi Alloy Bars for ITER Project

摘要：

This paper reported the method for high homogeneous NbTi alloy bar. The triple VAR melting methods was used to fabricate the NbTi ingot. The Nb inclusion and oxidized were not found in this alloy. The hydraulic forging machine was used to improve the plasticity and reform the microstructure of Nb-47Ti bar. The SEM and X-RAY were used to research the segregation of Ti-rich in NbTi alloy. The forging flow line and Ti-rich speck which were main factors to affect the mechanical working properties of NbTi wire were solved by improving melting process. The microstructure of NbTi bar was also become very fine and homogeneous. The difference of chemical element Ti was only ± 1 ％. The grain size of NbTi bar was smaller than 5 grade of ASTM. The NbTi wire for ITER which using this bar has already drawing to over 5000 meters long. The critical current density of this wire was higher than ITER standard. It is indicate that this NbTi bar could be used to NbTi wire for ITER project.

关键词： NbTi triple VAR melting Nb inclusion and oxidized segregation of Ti-rich forging flow line and Ti-rich speck grain size critical current density

作者: Baoquan FU Pingxiang ZHANG Yongjian ZHENG Yongsheng HE Yi FENG Yi ZHANG Xianghong LIU Yong FENG

作者单位: School of Materials Science and Engineering,Northwestern Polytechnical University,Xian 710072,China Western Superconducting Technologies Co.,Ltd,Xian 710018,China

会议类型: 国际会议

会议名称: The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)

会议地点: 北京

会议语种:英文

页码: 365-368

在线出版日期: 2011-06-19（万方平台首次上网日期，不代表论文的发表时间）