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Hydrogen-affected fatigue crack propagation at various loading frequencies and gaseous hydrogen pressures in commercially pure iron

Tomoki Shinko 1 Gilbert Hénaff 1, 2 Damien Halm 1, 2 Guillaume Benoit 1, 2 Giovambattista Bilotta 1, 2 Mandana Arzaghi 1, 2
2 ENDO - ENDOmmagement et durabilité ENDO
Département Physique et Mécanique des Matériaux - Département Physique et Mécanique des Matériaux
Abstract : Hydrogen-Affected Fatigue Crack Growth (HAFCG) in commercially pure iron has been characterized in terms of hydrogen gas pressure, loading frequency and stress intensity factor range ΔK. A higher hydrogen gas pressure decreases the critical value of ΔK triggering the HAFCG enhancement, and a lower loading frequency increases the HAFCG enhancement. Intergranular FCG in the non-accelerated regime is likely caused by the hydrogen-induced microvoid coalescence along the grain boundary, while a brittle cyclic cleavage fracture in the accelerated regime can be explained in terms of crack tip sharpening and hydrogen-enhanced decohesion process.
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Submitted on : Wednesday, October 13, 2021 - 9:24:13 AM
Last modification on : Wednesday, November 3, 2021 - 9:28:21 AM

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Tomoki Shinko, Gilbert Hénaff, Damien Halm, Guillaume Benoit, Giovambattista Bilotta, et al.. Hydrogen-affected fatigue crack propagation at various loading frequencies and gaseous hydrogen pressures in commercially pure iron. International Journal of Fatigue, Elsevier, 2019, 121, pp.197-207. ⟨10.1016/j.ijfatigue.2018.12.009⟩. ⟨hal-02283331⟩

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