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Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)

Jonathan Jones, Mark Whittaker Orcid Logo, Ross Buckingham, Richard Johnston Orcid Logo, Martin Bache, Daniel Clark

Materials & Design, Volume: 117, Pages: 47 - 57

Swansea University Authors: Jonathan Jones , Mark Whittaker Orcid Logo, Richard Johnston Orcid Logo, Martin Bache

Abstract

A three dimensional structure of varying wall thickness has been manufactured from an alloy similar to 718 and subjected to metallographic characterisation. The technique is evaluated as a process capable of generating complex geometries. This can be used to add features or as a free form fabricatio...

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Published in: Materials & Design
ISSN: 0264-1275
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa31556
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spelling 2020-11-02T13:50:18.6597240 v2 31556 2017-01-04 Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD) bd50c45efec14ab64ff4c9e7d09a03bf Jonathan Jones Jonathan Jones true false a146c6d442cb2c466d096179f9ac97ca 0000-0002-5854-0726 Mark Whittaker Mark Whittaker true false 23282e7acce87dd926b8a62ae410a393 0000-0003-1977-6418 Richard Johnston Richard Johnston true false 3453423659f6bcfddcd0a716c6b0e36a Martin Bache Martin Bache true false 2017-01-04 MTLS A three dimensional structure of varying wall thickness has been manufactured from an alloy similar to 718 and subjected to metallographic characterisation. The technique is evaluated as a process capable of generating complex geometries. This can be used to add features or as a free form fabrication method. However, in order to allow for comparison to structures developed through more traditional techniques, detailed microstructural characterisation has been undertaken to attempt to understand the potential effect of variation on resultant mechanical properties.Samples were extracted from six locations with different wall thicknesses, intricate features and intersecting ligament geometry. A γ″ linearly arrayed structure within a γ matrix was consistent throughout the component. Micro-porosity was restricted to isolated, spherical pores < 1 μm in diameter. Electron back-scatter diffraction and X-ray computed microtomography quantitative microstructural analysis techniques have been utilized to assess the influence of layering upon microporosity, patternation and grain structure.A detailed comparison is also made between blown powder Direct Layer Deposition (DLD) and a similar deposition technique, shaped metal deposition (SMD). Blown powder DLD produces a smaller weld pool and results in a more consistent microstructure than SMD, with less evidence of unfavourable phases brought about by prolonged exposure to high temperatures. The improved microstructure, however, must be measured against the different process economics of the blown powder DLD technique. Journal Article Materials & Design 117 47 57 0264-1275 5 3 2017 2017-03-05 10.1016/j.matdes.2016.12.062 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-11-02T13:50:18.6597240 2017-01-04T10:28:48.5956282 College of Engineering Engineering Jonathan Jones 1 Mark Whittaker 0000-0002-5854-0726 2 Ross Buckingham 3 Richard Johnston 0000-0003-1977-6418 4 Martin Bache 5 Daniel Clark 6 31556__4477__03267c8bb71a447c9c7266ed6b9f68ed.pdf jones2016v2.pdf 2017-01-04T10:30:29.2470000 Output 2982704 application/pdf Accepted Manuscript true 2017-12-23T00:00:00.0000000 false
title Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)
spellingShingle Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)
Jonathan, Jones
Mark, Whittaker
Richard, Johnston
Martin, Bache
title_short Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)
title_full Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)
title_fullStr Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)
title_full_unstemmed Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)
title_sort Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)
author_id_str_mv bd50c45efec14ab64ff4c9e7d09a03bf
a146c6d442cb2c466d096179f9ac97ca
23282e7acce87dd926b8a62ae410a393
3453423659f6bcfddcd0a716c6b0e36a
author_id_fullname_str_mv bd50c45efec14ab64ff4c9e7d09a03bf_***_Jonathan, Jones_***_
a146c6d442cb2c466d096179f9ac97ca_***_Mark, Whittaker_***_0000-0002-5854-0726
23282e7acce87dd926b8a62ae410a393_***_Richard, Johnston_***_0000-0003-1977-6418
3453423659f6bcfddcd0a716c6b0e36a_***_Martin, Bache_***_
author Jonathan, Jones
Mark, Whittaker
Richard, Johnston
Martin, Bache
author2 Jonathan Jones
Mark Whittaker
Ross Buckingham
Richard Johnston
Martin Bache
Daniel Clark
format Journal article
container_title Materials & Design
container_volume 117
container_start_page 47
publishDate 2017
institution Swansea University
issn 0264-1275
doi_str_mv 10.1016/j.matdes.2016.12.062
college_str College of Engineering
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hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description A three dimensional structure of varying wall thickness has been manufactured from an alloy similar to 718 and subjected to metallographic characterisation. The technique is evaluated as a process capable of generating complex geometries. This can be used to add features or as a free form fabrication method. However, in order to allow for comparison to structures developed through more traditional techniques, detailed microstructural characterisation has been undertaken to attempt to understand the potential effect of variation on resultant mechanical properties.Samples were extracted from six locations with different wall thicknesses, intricate features and intersecting ligament geometry. A γ″ linearly arrayed structure within a γ matrix was consistent throughout the component. Micro-porosity was restricted to isolated, spherical pores < 1 μm in diameter. Electron back-scatter diffraction and X-ray computed microtomography quantitative microstructural analysis techniques have been utilized to assess the influence of layering upon microporosity, patternation and grain structure.A detailed comparison is also made between blown powder Direct Layer Deposition (DLD) and a similar deposition technique, shaped metal deposition (SMD). Blown powder DLD produces a smaller weld pool and results in a more consistent microstructure than SMD, with less evidence of unfavourable phases brought about by prolonged exposure to high temperatures. The improved microstructure, however, must be measured against the different process economics of the blown powder DLD technique.
published_date 2017-03-05T12:38:34Z
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