Susceptibility to stress corrosion cracking of NiTi laser weldment in Hanks' solution

被引：25

作者：

Chan, C. W. ^{[1
]}

Man, H. C. ^{[1
]}

Yue, T. M. ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Laser Proc Grp, Adv Mfg Technol Res Ctr, Dept Ind & Syst Engn, Hong Kong, Hong Kong, Peoples R China

来源：

CORROSION SCIENCE | 2012年 / 57卷

关键词：

Intermetallics; Polarization; Stress corrosion; Intergranular corrosion; Welding; SHAPE-MEMORY ALLOY; TI SUPERELASTIC ALLOY; PHYSIOLOGICAL SALINE SOLUTION; SUSTAINED TENSILE LOAD; PIPELINE STEEL; MEDICAL APPLICATIONS; HYDROGEN ABSORPTION; PITTING CORROSION; ORTHODONTIC WIRES; STAINLESS-STEELS;

D O I：

10.1016/j.corsci.2011.12.010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the susceptibility to stress corrosion cracking (SCC) of laser-welded NiTi wires in Hanks' solution at 37.5 degrees C was studied by the slow strain-rate test (SSRT) at open-circuit potential and at different applied anodic potentials. The weldment shows high susceptibility to SCC when the applied potential is near to the pitting potential of the heat-affected zone (HAZ). The pits formed in the HAZ become sites of crack initiation when stress is applied, and cracks propagate in an intergranular mode under the combined effect of corrosion and stress. In contrast, the base-metal is immune to SCC under similar conditions. The increase in susceptibility to SCC in the weldment could be attributed to the poor corrosion resistance in the coarse-grained HAZ. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：260 / 269

页数：10

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