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STRESS CORROSION CRACKING MECHANISMS IN MARTENSITIC HIGH STRENGTH STEELS.
Summary technical rept. 1 Apr 66-1 Mar 67,
TRW EQUIPMENT LABS CLEVELAND OH
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Delayed failures of martensitic high-strength steels in aqueous environments were studied to determine the effect of environmental and metallurgical variables on the mechanisms of stress corrosion. The effects of chloride content, specimen geometry, and polarization potential on the delayed failure of AISI 4340 235 and 207 Ksi strength level and HP 9-4-45 242 Ksi strength level steels were evaluated. Incubation time for slow crack growth and crack growth rates were measured at various combinations of applied stress and environment using change of resistance and compliance measurements on precracked center-notch tensile and cantilever loaded notch bend specimens. Author
APPROVED FOR PUBLIC RELEASE