Unravelling the origin of multiple cracking in an additively manufactured Haynes 230

In this work, by using multi-scale characterizations from electron channeling contrast imaging (ECCI) to atom probe tomography (APT), we directly evidenced that the massive cracking events in the selective-laser-melted (SLMed) Haynes 230 superalloy are due to the continuous decoration of an M23C6-ty...

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Bibliographic Details
Published in:Materials research letters 2023-04, Vol.11 (4), p.281-288
Main Authors: He, Junyang, Wang, Rui, Li, Na, Xiao, Zhongrun, Gu, Ji, Yu, Hongyao, Bi, Zhongnan, Liu, Weihong, Song, Min
Format: Article
Language:English
Subjects:
Additive manufacturing
atom probe tomography
Carbides
cracking
Cracks
elemental segregation
Grain boundaries
High temperature
Laboratories
Lasers
Liquidation
Manganese
Melting points
Ni-based superalloy
Powder metallurgy
Scanning electron microscopy
Solidification
Solids
Superalloys
Thin films
Tomography
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Summary:In this work, by using multi-scale characterizations from electron channeling contrast imaging (ECCI) to atom probe tomography (APT), we directly evidenced that the massive cracking events in the selective-laser-melted (SLMed) Haynes 230 superalloy are due to the continuous decoration of an M23C6-type thin film at grain boundaries. The high-melting-point nature of the carbide rules out the possibility of liquidation cracking, while the long and straight film surface facilitates stress-induced solid-state cracking. Impurities, Si, Mn and Fe, greatly enhance the cracking susceptibility despite the interesting fact that they are strongly depleted from the carbide.
ISSN:2166-3831
2166-3831
DOI:10.1080/21663831.2022.2148491