Laboratory experiments and cohesive zone simulation of Hydrogen Induced Stress Cracking in SENT tests specimens of 25% Cr duplex stainless steel have been performed. A polynomial formulation of the traction separation law and hydrogen dependent critical stress was applied. Best agreement with the experiments was found for an initial critical stress of 2200 MPa and a critical separation of 0.005 mm. Proposed threshold stress intensity factor and lower bound net section stress is 20 MPa√m and 480 MPa. High crack growth rates and typical hydrogen influenced fracture topography suggest large influence of the stress and strain in the fracture process zone on the hydrogen diffusion rate.
- Ocean, Offshore and Arctic Engineering Division
Prediction of Hydrogen Embrittlement in 25% Cr Duplex Stainless Steel Based on Cohesive Zone Simulation
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Olden, V, Thaulow, C, Berstad, T, & O̸stby, E. "Prediction of Hydrogen Embrittlement in 25% Cr Duplex Stainless Steel Based on Cohesive Zone Simulation." Proceedings of the ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. Volume 6: Materials Technology; C.C. Mei Symposium on Wave Mechanics and Hydrodynamics; Offshore Measurement and Data Interpretation. Honolulu, Hawaii, USA. May 31–June 5, 2009. pp. 209-218. ASME. https://doi.org/10.1115/OMAE2009-79999
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