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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Powder Materials Processing and Fundamental Understanding
Presentation Title Synchrotron X-ray Imaging of Cracking during Laser Powder Bed Fusion (LPBF) of Aged CM247 Powder with Varying Oxygen Content
Author(s) David T. Rees, Chu Lun Alex Leung, Thomas Kellock, Gowtham Soundarapandiyan, Sebastian Marussi, Saurabh Shah, Robert Atwood, Ben Saunders, Gavin Baxter, Peter Lee
On-Site Speaker (Planned) David T. Rees
Abstract Scope Laser powder bed fusion (LBPF) of Ni-based superalloys enables the production of geometrically complex components for operation in high-temperature, high-stress environments. However, precipitation hardened alloys such as CM247 are highly susceptible to cracking during processing (hot-, liquation-, and ductility-dip cracking) and during heat-treatment. The underlying phenomena causing cracking, and how to prevent it, remains unclear but it is known that both the feedstock composition and complex thermal history are key factors. Here, we investigated the effect of different levels of oxidized CM247 powder on cracking during LPBF to identify a suitable trade-off between build quality and economic value. To observe crack evolution, we performed high-speed synchrotron X-ray radiography of the LPBF process over a range of processing parameters, and post-build synchrotron computed tomography. Our results show that high oxidized powder exacerbates crack formation and demonstrates that for a given defect size criteria, a tolerable oxidation level can be determined.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Powder Materials, Sustainability


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