Surface-crack aspect ratio development during corrosion-fatigue crack growth in low-alloy steels

1997 ◽  
Vol 172 (1-2) ◽  
pp. 61-71 ◽  
Author(s):  
L.A. James
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Aspect Ratio ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
Surface Crack ◽  
Low Alloy Steels ◽  
Corrosion Fatigue Crack ◽  
Alloy Steels ◽  
Corrosion Fatigue Crack Growth

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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