Fatigue crack growth rate experiments were performed on compact tension specimens of high strength low alloy structural steel (HSLA80, ASTM A710) in air, 3.5% NaCl, and artificial seawater solutions to investigate environmental effects on its crack growth rate, and threshold stress intensity factor range. Stress ratio for the tests were 0.1, and 0.8 while a sinusoidal loading was applied at a test frequency of 1, and 10 Hz. Comparison of the da/dN-Delta K curves shows that the fatigue crack growth rates of this steel fall in the same scatter band and the shift in the fatigue crack growth rate was not significant in all exposed environments, except artificial seawater at stress ratio of 0.1. However, the threshold stress intensity factor range was affected by the exposed environments, and it showed a drop from 12 MPa.m^0.5(for air) to 8 MPa.m^0.5(for artificial seawater and 3.5% NaCl solutions)

Subject
Crack growth, Corrosion fatigue, Materials, Corrosion rate, Sodium chloride, Artificial seawater, Crack propagation, Fatigue crack growth rate, Stress cracking, Sodium chloride solution, Steel, Marine vessels, Corrosion potential
Keywords:
Hsla80, Corrosion fatigue, Crack growth rate, artificial seawater, sodium chloride, corrosion rate
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1994
Association for Materials Protection and Performance (AMPP)
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