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Stress corrosion threshold (KIscc) data were generated for 180 and 215-ksi yield strength Type 4340 steel exposed to a 5 psig hydrogen sulfide gas environment. Tests were conducted with three-point-bend specimens containing both edge cracks and surface cracks ranging from 0.010 to 0.200 in. deep. The effect of defect size on KIscc was evaluated and the results compared to KIscc data generated with 1-in.-thick compact toughness specimens. Results show that absolute defect size (to as small as 0.010 in. deep) does not impose a limitation on the applicability of linear-elastic fracture mechanics concepts to small defect problems.
crack propagation, stress corrosion, fracture tests, toughness, steels, environment, hydrogen sulfide
Fellow engineer, Mechanics Department, Westinghouse Research Laboratories, Pittsburgh, Pa.