SEDL / STP / STP610-EB / STP28678S

Aqueous Stress-Corrosion Cracking of High-Toughness D6AC Steel

Gilbreath, WP
Research scientist and chemical engineering technician, Ames Research Center, National Aeronautics and Space Administration, Moffett Field, Calif.

Adamson, MJ
Research scientist and chemical engineering technician, Ames Research Center, National Aeronautics and Space Administration, Moffett Field, Calif.

Pages: 13    Published: Jan 1976

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Abstract

The crack growth behavior of D6AC steel as a function of stress intensity, stress and corrosion history, and test technique, under sustained load in filtered natural seawater, 3.3 percent sodium chloride solution, and distilled water, was investigated. Reported investigations of D6AC were considered in terms of the present study with emphasis on thermal treatment, specimen configuration, fracture toughness, crack-growth rates, initiation period, and threshold. Both threshold and growth kinetics were found to be relatively insensitive to these test parameters. The apparent incubation period was dependent on technique, both detection sensitivity and precracking stress intensity level.