Abstract
High-resolution X-ray computed tomography was used to perform in-situ observation of the microporosity evolution during a tensile test of a DD5 nickel-based single crystal superalloy. Every pore with the equivalent diameter over 7.53 μm has been traced. A damage factor that describes the influence of pores on the fracture surface is proposed. The influences of different pore characteristics on crack evolution are investigated. It is shown that clustering pores are the crack initiators rather than the isolated large pores. Pore spacing is the most significant porosity distribution characteristic controlling the crack path and the local stress concentration. Finally, during the rapid fracture stage, the large clustering pores with complex morphology can actually change the crack growth direction, resulting in accelerated cracking propagation. For the first time, the significances of different pore characteristics influencing different crack evolution stages were statistically compared.
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.
