Effects of Cyclic Plastic Strain on Hydrogen Environment Assisted Cracking in High-Strength Steel

Abstract : Cyclic loading tests were performed on micro-notched samples of high-strength steel S690QL (standard EN 10137-2) in air and under cathodic polarization in a saline solution. These specimens were modeled and their behavior simulated by finite elements calculations with a combined nonlinear isotropic-kinematic hardening constitutive law. This model can simulate cyclic softening and ratcheting effect of the high-strength steel. Stress and strain fields in the vicinity of the notch-tip were calculated. Results show a strong dependence of the crack initiation with plastic strain accumulation. Hydrogen assisted cracking mechanism is discussed based on arrangements of dislocations structures.
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Flavien Vucko, Cédric Bosch, David Delafosse. Effects of Cyclic Plastic Strain on Hydrogen Environment Assisted Cracking in High-Strength Steel. International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions, Sep 2012, Moran, WY, United States. Chap 38, ⟨10.1115/1.860298_ch38⟩. ⟨emse-01063865⟩

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