Failure of Nickel-Aluminum-Bronze Hydraulic Couplings, with Comments on General Procedures for Failure Analysis

Lynch, S.P.; Edwards, D.P.; Nethercott, R.B.; Davidson, J.L.

doi:10.1361/152981502770351545

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“…The test involves immersing an intact, cleaned component (manufactured by the same method as the failed component) in a mercurous-nitrate solution at 20°C for 30 min, washing, and then visual inspection for cracks (Fig. 29) [38]. Liquid mercury 'plates out' onto the surfaces by a displacement reaction, and cracking occurs by LME if there are surface residual tensile stresses.…”

Section: Residual Stress Testsmentioning

confidence: 99%

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Failures of Structures and Components by Metal-Induced Embrittlement

Lynch

2008

J Fail. Anal. and Preven.

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The basic aspects of liquid-metal embrittlement (LME) and solid metal-induced embrittlement (SMIE) are concisely reviewed, followed by case histories of failures involving (i) LME of an aluminium-alloy pipe by mercury in a natural-gas plant, (ii) SMIE of a brass valve in an aircraft-engine oil-cooler by internal lead particles, (iii) LME of a cadmium-plated steel screw from a crashed helicopter, (iv) LME of a cold-formed steel stiffener during galvanizing, and (v) LME of a steel gear by a copper alloy from an overheated bearing. These case histories illustrate how failures by LME and SMIE can be diagnosed and distinguished from other failure modes. The underlying causes of the failures and how they might be prevented are also discussed. Several beneficial uses of LME in failure analysis are then outlined.

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Section: Residual Stress Testsmentioning

confidence: 99%

“…29 Macroscopic views of crimped nickel-aluminium-bronze hydraulic couplings after the ASTM mercurous-nitrate residual-stress test showing longitudinal and circumferential cracks (arrowed). Note silvery colouration owing to the presence of liquid mercury [38] Understanding Other Failure Modes…”

Section: Residual Stress Testsmentioning

confidence: 99%

Failures of Structures and Components by Metal-Induced Embrittlement

Lynch

2008

J Fail. Anal. and Preven.

View full text Add to dashboard Cite

show abstract

Failure of Nickel-Aluminum-Bronze Hydraulic Couplings, with Comments on General Procedures for Failure Analysis

Cited by 1 publication

References 0 publications

Failures of Structures and Components by Metal-Induced Embrittlement

Failures of Structures and Components by Metal-Induced Embrittlement

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