SYMPOSIA PAPER Published: 01 January 1981
STP33423S

A Fractographic Investigation of Stress-Corrosion Cracking in High-Strength Steel Alloys

Source

The fracture separation processes of stress-corrosion cracking (SCC) specimens of steels with yield strengths in the 700 to 1400 MPa (100 to 200-ksi) range were investigated by scanning electron microscopy. Plates from a variety of processes were tested and examined. These included the electric furnace, electroslag remelt, vacuum induction melt-vacuum arc remelt, and electric furnace-vacuum arc remelt processes. The materials were studied both in the as-received condition and after heat treatment.

Stress-corrosion cracking tests were carried out on single-edge-notched, fatigue-precracked specimens by the cantilever beam method. The specimens were fractured under stress in an aqueous 3.5 percent sodium chloride solution while galvanically coupled to zinc. The modes of fracture at the fatigue-SCC interface, in the SCC zone, and in the overload area were investigated, and a correlation was drawn between the fracture mode, the microstructure, and the resistance of the steel alloy to stress-corrosion cracking.

Author Information

Fraser, FW
Naval Research Laboratory, Washington, D.C.
Metzbower, EA
Naval Research Laboratory, Washington, D.C.
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Details
Developed by Committee: E08
Pages: 51–69
DOI: 10.1520/STP33423S
ISBN-EB: 978-0-8031-4799-7
ISBN-13: 978-0-8031-0733-5