Effect of corrosive environment on the fatigue crack initiation and propagation behavior of Al 5454-H32
- King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia). Dept. of Mechanical Engineering
Fatigue behavior of aluminum alloy 5454-H32 was studied under laboratory air and 3% NaCl solution environment using smooth cylindrical and notched plate specimens. Presence of 3% NaCl environment during fatigue loading drastically reduced alloy fatigue life. The deleterious effect was pronounced in both types of specimens in the long-life regions, where the fatigue lives were lowered by as much as a factor of 10. However, the sharply notched specimens showed only a modest reduction in fatigue life in corrosive environment. The severe influence of the corrosive environment in the long-life (low-stress) regime cannot be explained merely by the early initiation of the fatigue crack from surface pits; the environmental contribution in the early crack growth regime must also be considered an important factor. Fracture surface studies revealed extensive pitting and some secondary cracking in the crack initiation region. It was shown that lowered fatigue life in Al 5454-H32 occurs by early initiation of fatigue cracks from surface pits. In addition, a corrosion pitting and secondary cracking process may be operative in the small crack growth region. This could have enhanced the early crack growth rate and thus contributed to the lower fatigue life in the long-cycle region.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 201102
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 1 Vol. 5; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of corrosion-fatigue properties of precorroded 6013 bare and 2024 bare aluminum alloy sheet materials. [Al-0. 8Si-0. 9Cu-0. 95Mg-0. 35Mn and Al-4. 4Cu-0. 6Mn-1. 5Mg]
A fatigue-life prediction methodology for notched aluminum-magnesium alloy in Gulf seawater environment
Related Subjects
ALUMINIUM BASE ALLOYS
CHEMICAL COMPOSITION
CHROMIUM ADDITIONS
COPPER ADDITIONS
CORROSION FATIGUE
CRACK PROPAGATION
CRACKS
IRON ADDITIONS
MAGNESIUM ALLOYS
MANGANESE ALLOYS
MECHANICAL PROPERTIES
NOTCHES
NUCLEATION
PITTING CORROSION
SILICON ADDITIONS
SODIUM CHLORIDES
TITANIUM ADDITIONS
ZINC ADDITIONS