Corrosion fatigue crack growth rate of the high strength low alloy structural steel (HSLA80) in marine environment

Conference · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:268246

Bavarian, B; Roderiguez, C ^[1]

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1. California State Univ., Northridge, CA (United States)

Fatigue crack growth rate experiments per ASTM E647 were performed on compact tension specimens of high strength low alloy structural steel (HSLA80, ASTM A710, base plate and HAZ region) in 3.5% NaCl, and artificial seawater solutions. The objective of the research was to investigate corrosion effects on crack growth rates, and threshold stress intensity factor range. Stress ratios for the tests were 0.1, and 0.8 while a cyclic loading was applied at a test frequency of 1. Comparison of the da/dN-{Delta}K curves in different environments shows that the fatigue crack growth rate of this steel increased in the presence of a corrosive species at its crack tip. The threshold stress intensity factor range was affected by the exposed environments, and it showed a drop from 12 MPa {times} m{sup 0.5} (for air) to 7 MPa {times} m{sup 0.5} (for artificial seawater and 3.5% NaCl solutions). Unfortunately, cathodic protection resulted in a higher crack growth rate for this steel (one order of magnitude), and some other protection system should be utilized.

• OSTI ID: 268246
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
CORROSION FATIGUE
CORROSIVE EFFECTS
CRACK PROPAGATION
LOW ALLOY STEELS
OFFSHORE PLATFORMS
SEAWATER
SODIUM CHLORIDES