About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
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Presentation Title |
Understanding the Influence of Boron in Additively Manufactured CoNi-based Superalloys Using Atom Probe Tomography |
Author(s) |
Qing-Qiang Ren, Jonathan Poplawsky, Evan Raeker, Kira Pusch, Tresa Pollock, Stephane Forsik, Ning Zhiu, Austin Dicus, Michael Kirka |
On-Site Speaker (Planned) |
Qing-Qiang Ren |
Abstract Scope |
Boron is commonly added to superalloys in small amounts to enhance creep resistance, but can lead to cracking at high concentrations, especially during the additive manufacturing process. Two grades of CoNi-based superalloys with different B contents were printed via laser powder bed fusion (LPBF) with the same printing parameters, where only the high B alloy showed serious cracking issues after printing. Atom probe tomography (APT) was used to measure the B concentration within GBs and on cracked surfaces, the results of which relates the B segregation level at GBs and/or cracking surfaces to the nominal compositions. The optimal B level that can offer creep resistance without causing cracking in the superalloys will be discussed based on the obtained results. APT research was supported by the Center for Nanophase Materials Sciences (CNMS), which is a US Department of Energy, Office of Science User Facility at Oak Ridge National Laboratory. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Additive Manufacturing |