A novel laser welding method for the reliable joining of NiTi/301SS

被引：17

作者：

Gao, Xiao-Long ^{[1
]}

Wang, Xiao-Qiang ^{[1
]}

Liu, Jing ^{[1
]}

Li, Lun-kun ^{[1
]}

机构：

[1] Baoji Univ Arts & Sci, Shannxi Key Lab Adv Mfg & Evaluta Robot Key Compo, Baoji 721016, Peoples R China

来源：

MATERIALS LETTERS | 2020年 / 268卷

基金：

中国国家自然科学基金;

关键词：

Welding; Laser processing; NiTi alloy; Dissimilar metal; Micro structure; TI6AL4V; NITI;

D O I：

10.1016/j.matlet.2020.127573

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, a novel laser welding method with Nb/Cu multi-interlayer was developed for improving the mechanical properties of NiTi/301SS joint. A hybrid joint consisting three metallurgical joining zones was obtained based on different welding mechanisms through a single pass welding. The self-fusion welding was formed on the Nb interlayer, and the fusion zone was composed of Nb-based solution. NiTi and Nb were well bonded by eutectic reaction, and the NiTi/Nb interface contained Nb-based solution, NiTi phase and Nb-NiTi eutectic structure. Nb and 301SS were joined by brazing because of the melting of Cu, and the Nb/Cu/301SS interface consisted of Nb-, Cu-, and Fe-based solutions and a little Fe7Nb6 intermetallic. The strength and ductility of the joints with interlayer were 126% and 188% higher than the joints without interlayer, respectively. The use of Nb/Cu multi-interlayer completely prevented the formation of Ti-Fe and TixNiy IMCs, which can improve significantly mechanical properties of joints. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：4

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