Microstructural evolution in the heat-affected zone of laser-welded superelastic NiTi alloy wire

被引：1

作者：

Asadi, Saeed ^{[1
,2
]}

Saeid, Tohid ^{[2
]}

Kim, Yejin ^{[1
]}

Habibi, Farzad ^{[2
]}

Jang, Myeong Hyeon ^{[1
]}

Sugiarto, Andreas ^{[1
]}

Valanezhad, Alireza ^{[3
]}

Park, Nokeun ^{[1
,4
]}

机构：

[1] Yeungnam Univ, Sch Mat Sci & Engn, 280 Daehak Ro, Gyeongbuk 38541, South Korea

[2] Sahand Univ Technol, Fac Mat Engn, Tabriz, Iran

[3] Nagasaki Univ, Dept Dent & Biomed Mat Sci, Nagasaki, Japan

[4] Yeungnam Univ, Inst Mat Technol, 280 Daehak Ro, Gyongsan 38541, Gyeongsangbuk D, South Korea

来源：

MATERIALS LETTERS | 2021年 / 304卷

关键词：

Superelastic NiTi; Laser beam welding; HAZ; Nanoindentation; Ni4Ti3;

D O I：

10.1016/j.matlet.2021.130606

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Due to the unique properties of NiTi alloys, retaining the base metal (BM) properties in the heat-affected zone (HAZ) is of great importance during welding. Therefore, the welding of these alloys should be designated in a way that the obtained joint experiences the slightest deviation from the BM's properties. The present study focused on microstructural evolution and mechanical properties in the HAZ of superelastic NiTi wires joined by laser beam welding. Microstructural investigations revealed that grain growth occurs in the HAZ due to the heat generated during welding. Also, austenitic NiTi (B2) decomposes to B19' martensitic structure with Ni4Ti3 precipitates in this zone. These precipitates were identified using EDS, EBSD, and TEM. Studying the superelastic behavior by nanoindentation test disclosed that the microstructural changes result in softening and degradation in superelastic behavior of HAZ.

引用

页数：4

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