Abstract
Hydrogen-assisted fatigue crack propagation behavior of a selective laser melted Inconel 718 alloy was investigated under in situ electrochemical hydrogen charging, and by multi-scale microstructural analysis. Results show that hydrogen significantly accelerates fatigue crack growth rate (FCGR), and such effect is intensified when decreasing load frequency. Crack propagation along cellular structure boundaries and decrease of plasticity along the crack have been evidenced. Hydrogen decreases the critical strain for crack propagation and results in the acceleration of FCGR. Lower load frequency induces higher amplitude of concentration fluctuation and larger penetration depth of hydrogen ahead of the crack tip, thus further promotes the acceleration of FCGR.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call