Creep behaviour of inconel 718 processed by laser powder bed fusion
Additive manufacturing lends itself well to the manufacture of aerospace parts due to the high complexity and small volume of many components found in modern aero engines. By exploiting additive manufacturing design freedoms, enhanced part functionality can be achieved and lead time can be reduced....
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| Format: | Article |
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Elsevier
2018
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| Online Access: | https://eprints.nottingham.ac.uk/49728/ |
| _version_ | 1848798063515140096 |
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| author | Xu, Zhengkai Hyde, C.J. Tuck, C. Clare, A.T. |
| author_facet | Xu, Zhengkai Hyde, C.J. Tuck, C. Clare, A.T. |
| author_sort | Xu, Zhengkai |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Additive manufacturing lends itself well to the manufacture of aerospace parts due to the high complexity and small volume of many components found in modern aero engines. By exploiting additive manufacturing design freedoms, enhanced part functionality can be achieved and lead time can be reduced. However, the integrity of these parts is a primary concern which often cannot be guaranteed with current generation additive manufacturing methods and materials. Studies on the performance of additively manufactured parts under service conditions are therefore required.
In this study, laser powder bed fusion is used to produce specimens for creep testing. To allow this a novel specimen design, i.e. Two Bar Specimen, was applied for creep testing. The performance of these specimens, in the as-build condition, is showed to be largely poor because of surface integrity defects and unfavourable microstructure formation. These are clearly highlighted and explored. Further specimens, subjected to heat treatments, have also been tested. These showed a marked improvement of the microstructure. The lifetime of the heat-treated sample prepared with milling + wire electrical discharge machining was enhanced by as much as four times compared to the as-build specimens. However, this lifetime performance remains 33% below that of samples machined from the equivalent wrought material. This work then proposes manufacturing strategies to significantly enhance the performance of Inconel 718 when processed via laser powder bed fusion and post-heat-treatments. |
| first_indexed | 2025-11-14T20:13:49Z |
| format | Article |
| id | nottingham-49728 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:13:49Z |
| publishDate | 2018 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-497282020-05-04T19:44:23Z https://eprints.nottingham.ac.uk/49728/ Creep behaviour of inconel 718 processed by laser powder bed fusion Xu, Zhengkai Hyde, C.J. Tuck, C. Clare, A.T. Additive manufacturing lends itself well to the manufacture of aerospace parts due to the high complexity and small volume of many components found in modern aero engines. By exploiting additive manufacturing design freedoms, enhanced part functionality can be achieved and lead time can be reduced. However, the integrity of these parts is a primary concern which often cannot be guaranteed with current generation additive manufacturing methods and materials. Studies on the performance of additively manufactured parts under service conditions are therefore required. In this study, laser powder bed fusion is used to produce specimens for creep testing. To allow this a novel specimen design, i.e. Two Bar Specimen, was applied for creep testing. The performance of these specimens, in the as-build condition, is showed to be largely poor because of surface integrity defects and unfavourable microstructure formation. These are clearly highlighted and explored. Further specimens, subjected to heat treatments, have also been tested. These showed a marked improvement of the microstructure. The lifetime of the heat-treated sample prepared with milling + wire electrical discharge machining was enhanced by as much as four times compared to the as-build specimens. However, this lifetime performance remains 33% below that of samples machined from the equivalent wrought material. This work then proposes manufacturing strategies to significantly enhance the performance of Inconel 718 when processed via laser powder bed fusion and post-heat-treatments. Elsevier 2018-06-30 Article PeerReviewed Xu, Zhengkai, Hyde, C.J., Tuck, C. and Clare, A.T. (2018) Creep behaviour of inconel 718 processed by laser powder bed fusion. Journal of Materials Processing Technology, 256 . pp. 13-24. ISSN 0924-0136 Creep; Two bar specimen; Additive manufacture; Inconel 718; Laser powder bed fusion https://www.sciencedirect.com/science/article/pii/S0924013618300414 doi:10.1016/j.jmatprotec.2018.01.040 doi:10.1016/j.jmatprotec.2018.01.040 |
| spellingShingle | Creep; Two bar specimen; Additive manufacture; Inconel 718; Laser powder bed fusion Xu, Zhengkai Hyde, C.J. Tuck, C. Clare, A.T. Creep behaviour of inconel 718 processed by laser powder bed fusion |
| title | Creep behaviour of inconel 718 processed by laser powder bed fusion |
| title_full | Creep behaviour of inconel 718 processed by laser powder bed fusion |
| title_fullStr | Creep behaviour of inconel 718 processed by laser powder bed fusion |
| title_full_unstemmed | Creep behaviour of inconel 718 processed by laser powder bed fusion |
| title_short | Creep behaviour of inconel 718 processed by laser powder bed fusion |
| title_sort | creep behaviour of inconel 718 processed by laser powder bed fusion |
| topic | Creep; Two bar specimen; Additive manufacture; Inconel 718; Laser powder bed fusion |
| url | https://eprints.nottingham.ac.uk/49728/ https://eprints.nottingham.ac.uk/49728/ https://eprints.nottingham.ac.uk/49728/ |