Abstract
We report on the observation of a novel hot cracking mechanism in a direct laser deposited nickel-based superalloy, using joint electron, X-ray, and atom microscopy. The majority of the observed cracks were related to Ni and Mo oxides formed in grain interiors as well as at grain boundaries. Using atom probe tomography, we detected an intermediate zone between oxide particles and the base alloy, where oxygen existed in solid solution and chemical compositions varied due to the oxide formation. The variation in composition lowered the melting point of the matrix while the oxides promoted stress concentration and crack nucleation, thus causing liquation cracking during reheating.
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.