Abstract
The effects of fatigue damage on the hydrogen embrittlement (HE) sensitivity of X80 steel welded joints, obtained using flux-cored arc welding method, were investigated in the study. Results show that both the yield and tensile strength increased for all the hydrogen-charged welded joints and decreased with the accumulation of fatigue damage. The fracture surface is the mixture of local quasi-cleavage (QC) surrounded by shallow dimples ductile fracture for hydrogen-charged welded joints, whilst that of hydrogen-free welded joint is typical dimple ductile fracture. The presence of fisheye morphology might be related to the hydrogen, local strain accumulation in the vicinity of inclusions and dislocations evolution caused by the cyclic load. The mechanism is the synergistic action of hydrogen-enhanced decohesion (HEDE) and hydrogen enhanced localized plasticity (HELP). However, the pinning effect of hydrogen on the dislocation motion is the dominant role.
Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
