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Staged thermomechanical testing of nickel superalloys produced by selective laser melting

Xu, Zhengkai; Hyde, Christopher J.; Thompson, Adam; Leach, Richard K.; Maskery, Ian; Tuck, Christopher; Clare, Adam T.

Authors

Zhengkai Xu

Christopher J. Hyde

Adam Thompson

Richard K. Leach

Ian Maskery

Christopher Tuck

Adam T. Clare



Abstract

The creep performance of additively manufactured components remains an issue before additive manufacturing can be put fully implemented. In this study, Inconel 718 two-bar specimens are produced by selective laser melting and subjected to a ‘staged’ creep test. Creep test was interrupted at critical junctures and X-ray computed tomography measurements performed at various extensions of the specimen. Periodic X-ray computed tomography measurements allow, for the first time, examination of the specimens during creep testing. Evaluation of specimen performance shows the number and size of pores within the specimen increasing over time as a result of classical creep mechanisms. Location and tracking over time of weak points are performed, allowing early estimation of sample failure points. This information is valuable to selective laser melting practitioners who seek to optimise the build strategy in order to minimise in-built defects.

Journal Article Type Article
Publication Date Nov 5, 2017
Journal Materials & Design
Print ISSN 0261-3069
Electronic ISSN 0264-1275
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 133
APA6 Citation Xu, Z., Hyde, C. J., Thompson, A., Leach, R. K., Maskery, I., Tuck, C., & Clare, A. T. (2017). Staged thermomechanical testing of nickel superalloys produced by selective laser melting. Materials and Design, 133, doi:10.1016/j.matdes.2017.08.009
DOI https://doi.org/10.1016/j.matdes.2017.08.009
Keywords Creep; Two-bar specimen; X-ray computed tomography; Selective laser melting; Mechanical testing; Nickel superalloys
Publisher URL http://www.sciencedirect.com/science/article/pii/S0264127517307530
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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