Effect of temperature and pressure on hydrogen cracking in high strength type 4340 steel
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The effect of temperature and pressure on the environment induced static load cracking performance of 180 ksi (1240 MPa) yield strength AISI type 4340 steel exposed to dry hydrogen and hydrogen sulfide gas was evaluated. KIscc and static load crack growth rate data were developed with 1 in. (2.54 cm) thick compact toughness specimens and the results expressed in terms of fracture mechanics parameters. Results show that temperature and pressure have a significant effect on cracking performance measured in dry hydrogen gas. Temperature was found to affect the KIscc measured in H2S gas but neither temperature or pressure had a significant effect on the corresponding crack growth rate. The results of this investigation are consistent with the critical hydrogen concentration concept of stress corrosion cracking.
KeywordsStress Intensity Factor Crack Growth Rate Stress Corrosion Hydrogen Sulfide Room Temperature Mechanical Property
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