Corrosion Fatigue


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corrosion fatigue

[kə′rō·zhən fə′tēg]
(metallurgy)
Damage to or failure of a metal due to corrosion combined with fluctuating fatigue stresses.

Corrosion Fatigue

 

a reduction of the endurance limit of a metal or alloy resulting from the simultaneous action of cyclical alternating stresses and a corrosive medium. Fracture of the metal occurs because of the appearance of a network of trans-crystalline or intercrystalline microscopic fissures, which become a large corrosion fatigue fissure. The maximum mechanical stress at which the metal does not fracture after the simultaneous action of an established number of alternating stress cycles and given corrosion conditions is called the corrosion fatigue limit.

References in periodicals archive ?
However, for some turbine blades, hot corrosion and corrosion fatigue may make continued service untenable before the expiration of this life.
According to the fact that pitting or crevice corrosions can be regarded as an initiating factor for fatigue failure, it can be presumed that the conventional fatigue failure might be related to the corrosion fatigue. This issue can finally affect the instrument fatigue resistance (12, 13).
However, the research emphasis is always on the corrosion characteristics of different weld joints [7, 8, 20], extended behavior of corrosion fatigue crack [22-24], and specific corrosion environment's impacts on corrosion characteristics of welded structures [25-27].
Nickel electroplating on low carbon steel are used in many industrial application due to its improving corrosion fatigue life.
Corrosion fatigue, when metals are subjected to alternating stresses in a corrosive environment, can affect all types of welded connections on drill ships, drilling and production rigs and platforms.
Precorrosion fatigue and corrosion fatigue damage rules have been broadly reported and indicate a synergism between corrosion and fatigue [7-9].
Investigation of the steel protection parameters in relation to specific products and service conditions may allow to control the corrosion fatigue properties of metals and predict this characteristics in the future [8].
Limit to corrosion fatigue strength evaluation of sae 1020 steel in acidic environment
The corrosion fatigue life of structure without the initial cracking was divided into two stages, namely, the actual life of corrosion fatigue crack and the propagation life of corrosion fatigue fracture, as shown in Figure 1.
The NTSB's key finding was that the Line 6B segment ruptured under normal operating pressure due to corrosion fatigue. But the report goes on to say that federal law "does not provide clear requirements regarding when to repair and when to remediate pipeline defects and inadequately defines the requirements for assessing the effect on pipeline integrity when either crack defects or cracks and corrosion are simultaneously present in the pipeline."
This work presents 37 papers from the conferences, detailing recent research and applications in environmental degradation of structural materials, hydrogen degradation, stress corrosion cracking, and hydrogen and corrosion fatigue, in addition to experiments and modeling of environmental-assisted cracking, advanced materials technologies, and case studies of material failure in various industrial applications.
In particular, several cases have been described in the literature of premature failures of structures due to localized attack such as corrosion fatigue, wear-corrosion, but mainly stress corrosion cracking (SCC) [3-5].