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Liquid metal induced embrittlement as a case of stress corrosion cracking?

100%

Wolski K.

Advances in Materials Science

2007

tom Vol. 7, nr 1(11)

93-99

Lmie (liquid metal indueed embrittlement) was studied on two model-systems: ni-bi at 700°c and cu-bi at 500°c. Lmie has been split in two independent steps, namely intergranular penetration at high temperature in absence of any external stress and room temperature embrittlement. Both systems exhibit rapid intergranular penetration with parabolic kinetics and subsequent room-temperature brittleness due to the intergranular diffusion of bismuth. The concentration profile of bismuth in grain boundaries bas been obtained by quantitative auger electron spectroscopy. For both systems an approximately one hundred microns transition zone between unaffected and embrittled part of grain boundary bas been shown, as opposed to Some nanometres transition length typical of the wetting phenomena. A major implication of these results is that the modelling of intergranular penetration and liquid metal embrittlement have to be based on a diffusionnal mechanism operating at a very tip of the penetration profile and in this sense lme (but not lmie) can be considered as a case of stress corrosion cracking.

Case studies of steel structure failures

67%

Bernasovský P.

2010

tom Vol. 10, iss. 1 spec.

365--370

The contribution deals with some case studies of steel structure failures, which happened in Slovakia a few years ago. Features of cracking are illustrated on real cases of breakdowns in the transmission gas pipelines, at the cement works and in the petrochemical industry. All failures were caused by an incorrect technical approach. Possible remedial measures are proposed.