Abstract
This study reported the significant influence of Ta on hydrogen-induced cracking of pipeline steels. It was found that with decreasing TaC size, the hydrogen diffusivity of steels was decreased, as the hydrogen trapping of TaC is surface-dominant. Ta inhibited crack initiation through deep H-traps provided by small semi-coherent/incoherent TaC (<35 nm), whilst trigger cracks directly at incoherent TaC/α-Fe interfaces when TaC > ~223 nm. Moreover, Ta suppressed crack propagation as it increased effective H-trap densities, optimized crystallographic characteristics (changing the proportions of Σ3, Σ11, Σ17 and high-angle grain boundaries), and inhibited H-dislocation interaction, which was more pronounced when TaC was smaller.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.