Staged thermomechanical testing of nickel superalloys produced by selective laser melting

Xu, Zhengkai and Hyde, Christopher J. and Thompson, A. and Leach, R.K. and Maskery, I. and Tuck, C. and Clare, A.T. (2017) Staged thermomechanical testing of nickel superalloys produced by selective laser melting. Materials & Design, 133 . pp. 520-527. ISSN 0264-1275

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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.

Item Type: Article
Keywords: Creep; Two-bar specimen; X-ray computed tomography; Selective laser melting; Mechanical testing; Nickel superalloys
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: 10.1016/j.matdes.2017.08.009
Depositing User: Eprints, Support
Date Deposited: 15 Sep 2017 11:13
Last Modified: 13 Oct 2017 16:36
URI: http://eprints.nottingham.ac.uk/id/eprint/46426

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