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The effects of cold working on the stress-corrosion cracking performance of a 140 ksi (965 MPa) yield strength type 4340 steel are evaluated. Compact-toughness specimens representing 0, 10, 25, and 50 percent cold-worked material were subjected to an accelerated stress-corrosion test in hydrogen sulfide gas and the results expressed in terms of fracture mechanics parameters. The effect of mechanical strenghtening on KIscc is compared with the effect of metallurgical strengthening, and the influence of stress relieving and crack-plane orientation are considered. Results show that mechanical and metallurgical strengthening have a similar influence on KIscc, and stress relieving can improve the stress-corrosion resistance of cold-worked 4340 steel. No significant effect of crack-plane orientation on KIscc was observed.
crack propagation, environments, heat treatment, growth, cold working, stresses, corrosion, fractures (materials)
Fellow engineer, Mechanics Department, Westinghouse Research Laboratories, Pittsburgh, Pa.