Corrosion Fatigue Crack Growth of Steels in Various Environments

1989 ◽  
Vol 111 (1) ◽  
pp. 40-45 ◽  
Author(s):  
H. Alawi ◽  
A. Ragab ◽  
M. Shaban
Keyword(s):  
Drinking Water ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
Sea Water ◽  
Industrial Site ◽  
Corrosion Fatigue Crack ◽  
Aggressive Environment ◽  
Corrosion Fatigue Crack Growth

Corrosion fatigue crack growth of three steels namely: AISI C1018, AISI 4340, and Stainless 17-7PH is studied in various environments. Testing medias include natural sea water, polluted sea water from an industrial site, drinking water produced from desalination process, and laboratory environments. Results obtained for the three steels are consistent in showing that polluted sea water is the most aggressive environment followed by low bicarbonate and alkalinity drinking water, then natural sea water. An attempt is made to explain this extraordinary aggressiveness of the polluted sea water and drinking water.

Corrosion-Fatigue Crack Growth in Age-Hardened Al Alloys: Examples of Failures and Explanations for Fractographic Observations

2014 ◽  
Vol 891-892 ◽  
pp. 248-253 ◽  
Author(s):  
Rohan Byrnes ◽  
Noel Goldsmith ◽  
Mark Knop ◽  
Stan Lynch
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
Compact Tension ◽  
Al Alloys ◽  
Corrosion Fatigue Crack ◽  
Crack Tips ◽  
Corrosion Fatigue Crack Growth ◽  
Additional Support

The characteristics of corrosion-fatigue in age-hardened Al alloys, e.g. brittle striations on cleavage-like facets, are described, with reference to two examples of component failure. Mechanisms of corrosion fatigue (and explanations for fracture-surface features) are then reviewed. New observations of corrosion-fatigue crack growth for 7050-T7451 alloy compact-tension specimens tested in aqueous environments using a constant (intermediate) ΔK value but different cycle frequencies are then described and discussed. These observations provide additional support for a hydrogen-embrittlement process involving adsorption-induced dislocation-emission from crack tips.

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