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The stress-corrosion, crack-initiation properties of two high-strength (180 ksi, 1240 MPa and 215 ksi, 1480 MPa yield strength) American Iron and Steel Institute type 4340 steels were evaluated with blunt-notch test specimens exposed to hydrogen sulfide (H2S) gas (that is, an accelerated test environment). Results show that the initiation of a stress-corrosion crack from a blunt notch depends primarily upon the notch-tip strain which, in turn, can be related to the elasticity calculated maximum notch-tip stress and the notch-tip radius. A test method and analytical procedure is proposed which can be used to predict the critical strain required to develop stress-corrosion cracking at a blunt notch.
crack propagation, stress corrosion, corrosion, fracture, notch, steels, cracks, stresses
Fellow engineer, Mechanics Department, Westinghouse Research Laboratories, Pittsburgh, Pa.