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2 2007

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Studying hydrogen embrittlement of metals by elastic-plastic methods.

100%

Dietzel W. , Pfuff M.

tom Vol. 65, nr 11

3-11

Fracture mechanics based test and evaluation techniques are used to gain insight into the phenomenon of stress corrosion cracking (SCC) and to develop guidance for avoiding or controlling SCC. In particular, experiments that arc based on rising load or rising displacement methods are well suited to study cases of SCC and hydrogen embrittlement (HE) of high strength steels, aluminium and titanium alloys, and to characterise the susceptibility of these materials to environmentally assisted cracking. Rising displacement tests on pre-cracked specimens have also proved to be well suited for studying SCC mechanisms and to model the degradation of metallic materials caused by the uptake of atomic hydrogen from the corrosive environment. Measurement of the crack tip opening angle, CTOA, or, equivalent to this, the ratio between crack growth velocity and the applied deformation rate allows a comparison with models that simulate the mechanism leading to HE.

Stress corrosion cracking of magnesium

70%

Winzer N. , Song G. , Atrens A. , Dietzel W. , Kainer K. U.

Advances in Materials Science

2007

tom Vol. 7, nr 1(11)

83-92

The increased use of Mg-alloys for stressed automotive components has created a demand for a better mechanistic under-standing of the environmental and mechanical influences contributing to Transgranular Stress Corrosion Cracking (TGSCC). TGSCC is the inherent mode of failure for Mg alloys exposed to aqueous environments below their yield stress. It is gener-ally accepted that the predominant mechanism(s) for TGSCC is a type of Hydrogen Assisted Cracking (HAC); however, the specific nature of this mechanism(s) is equivocal. The most commonly proposed mechanism is Delayed Hydride Cracking (DHC). This work investigates its tenability by comparing experimental measurements of the stress corrosion crack velocity, Vc with predictions based on a numerical model for DHC. The measured velocity was in the range of 7x10-10 m/s to 5x10-9 m/s. The initial prediction of the DHC model is 5x10-7 m/s. An investigation into the sensitivity of the model to input parameters is currently underway.