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

C. W. Chan; Hau Chung Man; Tai Man Yue

doi:10.1016/j.corsci.2011.12.010

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

C. W. Chan, Hau Chung Man, Tai Man Yue

Research output: Journal article publication › Journal article › Academic research › peer-review

28 Citations (Scopus)

Abstract

In this study, the susceptibility to stress corrosion cracking (SCC) of laser-welded NiTi wires in Hanks' solution at 37.5 °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.

Original language	English
Pages (from-to)	260-269
Number of pages	10
Journal	Corrosion Science
Volume	57
DOIs	https://doi.org/10.1016/j.corsci.2011.12.010
Publication status	Published - 1 Apr 2012

Keywords

A. Intermetallics
B. Polarization
C. Intergranular corrosion
C. Stress corrosion
C. Welding

ASJC Scopus subject areas

General Materials Science
General Chemical Engineering
General Chemistry

More information

10.1016/j.corsci.2011.12.010

Cite this

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title = "Susceptibility to stress corrosion cracking of NiTi laser weldment in Hanks' solution",

abstract = "In this study, the susceptibility to stress corrosion cracking (SCC) of laser-welded NiTi wires in Hanks' solution at 37.5 °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.",

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AU - Chan, C. W.

AU - Man, Hau Chung

AU - Yue, Tai Man

PY - 2012/4/1

Y1 - 2012/4/1

N2 - In this study, the susceptibility to stress corrosion cracking (SCC) of laser-welded NiTi wires in Hanks' solution at 37.5 °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.

AB - In this study, the susceptibility to stress corrosion cracking (SCC) of laser-welded NiTi wires in Hanks' solution at 37.5 °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.

KW - A. Intermetallics

KW - B. Polarization

KW - C. Intergranular corrosion

KW - C. Stress corrosion

KW - C. Welding

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U2 - 10.1016/j.corsci.2011.12.010

DO - 10.1016/j.corsci.2011.12.010

M3 - Journal article

SN - 0010-938X

VL - 57

SP - 260

EP - 269

JO - Corrosion Science

JF - Corrosion Science

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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