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Elucidation of the critical current enhancement mechanism due to the repeated bending treatment for high-strength Nb_3Sn wires

阐明高强度Nb_3Sn线材反复弯曲处理的临界电流增强机制

基本信息

批准号：
16360145
负责人：
WATANABE Kazuo
金额：
$ 9.15万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

Research subjective was to understand the basic mechanism for the critical current enhancement effect due to the applying repeated bending strain at room temperature fur pre-reacted NbaSn strands and to find the important guiding principle for the manufacturing process of NbaSn strand cables, employing pre-reacted NbaSn strands.To apply the critical current enhancement effect for NbaSn strands with the repeated bending strain treatment, a test oil was prepared by NbaSn strands reinforced with CuNb composite, and the critical current enhancement was confirmed in the test coil applied by a large hoop stress. The SEM observation was carried out for NbaSn strand-directional filaments etched out from the repeated-bending-treatment sample. It is found that the repeated bending treatment introduces micro-crack defects into NbaSn filament cores, and that such micro-crack defects do not increase until a tolerated strain limit of 0.8 %, in the case of NbaSn strands with. CuNb reinforcement in the outer portion. The NbaSn strands with and without the prebending treatment were measured by the neutron diffraction, which is a high resolution and high intensity powder diffractmeter at KEK in Tsukuba. The residual strains for the prepared NbaSn strands with and without the prebending treatment reveal the clear difference in the lateral direction between the two. We succeeded in indicating the residual strain reduction for the repeated bend NbaSn directly by the neutron diffraction. This means that the important understandings for the critical current enhancement elect of Nb_3Sn strands were obtained.The three + four (3+4) strand cable Consisting of three Nb_3Sn strands and four stainless steel strands were fabricated to develop new NbaSn stand cables applying the critical current enhancement effect It is found that the prepared 3+4 strand cable surely maintains such enhancement in the practical strand cabling process.

研究的目的是了解在常温下反复施加弯曲应变产生的临界电流增强效应的基本机理，为采用预反应的NbaSn钢绞线的制造工艺找到重要的指导原则。为了将临界电流增强效应应用于多次弯曲应变处理的NbaSn钢绞线，用CuNb复合材料增强的NbaSn钢绞线制备了一种试验油，并在大的环向应力作用下证实了试验线圈的临界电流增强。对反复弯曲处理后的NbaSn丝进行了扫描电子显微镜观察。结果表明，反复弯曲处理在NbaSn丝芯材中引入了微裂纹缺陷，并且在NbaSn丝芯材的应变极限为0.8%时，这种微裂纹缺陷不会增加。外部部分的CuNb钢筋。在筑波KEK的高分辨率、高强度粉末衍射仪上，用中子衍射仪测量了预弯处理前后的NbaSn线。预弯处理和未预弯处理的NBaSn钢绞线的残余应变在横向上有明显的差异。我们成功地用中子衍射法直接表明了重复弯曲的NBaSn的残余应变降低。研制了由3根Nb_3SN绞线和4根不锈钢绞线组成的3+4(3+4)股电缆，研制了应用临界电流增强效应的新型NbSn钢绞线。结果表明，在实际的绞线布线过程中，所制备的3+4股电缆确实具有这种增强作用。

项目成果

期刊论文数量（60）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Prebending Effects in Bronze Route Nb_<3>Sn Wires -Mechanism and Application-

青铜路线Nb_<3>Sn线的预弯效应-机理与应用-

DOI：
发表时间：
2005
期刊：
影响因子：
0
作者：
S. Awaji;H. Oguro;G. Nishijima and K. Watanabe
通讯作者：
G. Nishijima and K. Watanabe

Cryogen-Free Superconducting Magnet Fabricated by a React and Wind Method Employing Nb_<3>Sn Wires with CuNbTi Reinforcement

CuNbTi增强Nb_<3>Sn线反应风法制备无液剂超导磁体

DOI：
发表时间：
2004
期刊：
影响因子：
0
作者：
K. Watanabe;G. Nishijima;S. Awaji;K. Takahashi;K. Miyoshi;S. Meguro;M. Ishizuka and T. Hasebe
通讯作者：
M. Ishizuka and T. Hasebe

Progress and Challenges in Cryogen-Free Hybrid Magnets

无制冷剂混合磁体的进展和挑战

DOI：
发表时间：
2004
期刊：
影响因子：
0
作者：
K. Watanabe;T. Mitsuhashi;N. Nanato;S.B. Kim;S. Murase;G. Nishijima;K. Watanabe and K. Miyoshi;K. Watanabe
通讯作者：
K. Watanabe

High-Strength Nb_3Sn Wire Development for Compact Superconducting Magnets

用于紧凑型超导磁体的高强度 Nb_3Sn 线材开发