A study of the influence of novel scan strategies on residual stress and microstructure of L-shaped LPBF IN718 samplesShow others and affiliations
2022 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 214, article id 110386Article in journal (Refereed) Published
Abstract [en]
Process parameters in laser-based powder bed fusion (LBPF) play a vital role in the part quality. In the current study, the influence of different novel scan strategies on residual stress, porosities, microstructure, and crystallographic texture has been investigated for complex L-shape parts made from nickel-based superalloy Inconel 718 (IN718). Four different novel scanning strategies representing total fill, re-melting, and two different sectional scanning strategies, were investigated using neutron diffraction, neutron imaging, and scanning electron microscopy techniques. These results were compared with the corresponding results for an L-shape sample printed with the conventional strategy used for achieving high density and more uniform crystallographic texture. Among these investigated novel strategies, the re-melting strategy yielded approximately a 25% reduction in surface residual stress in comparison to the reference sample. The other two sectional scanning strategies revealed porosities at the interfaces of the sections and due to these lower levels of residual stress were also observed. Also, variation in crystallographic texture was observed with different scan strategies. © 2022 The Author(s)
Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 214, article id 110386
Keywords [en]
Additive manufacturing, Neutron diffraction, Neutron imaging, Residual stresses, Scan strategies, Melting, Neutrons, Nickel alloys, Porosity, Scanning electron microscopy, Selective laser melting, Textures, Crystallographic textures, Inconel-718, L-shaped, Laser-based, Powder bed, Process parameters, Re-melting, Scan strategy, Scanning strategies
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ri:diva-58282DOI: 10.1016/j.matdes.2022.110386Scopus ID: 2-s2.0-85122643169OAI: oai:DiVA.org:ri-58282DiVA, id: diva2:1632345
Note
Funding details: Stiftelsen för Strategisk Forskning, SSF, GSn15–0008; Funding details: VINNOVA; Funding text 1: This research is funded by the Swedish Foundation for Strategic Research (SSF) within the Swedish national graduate school in neutron scattering (SwedNess) (grant number GSn15?0008). The neutron diffraction experiments were conducted at Australia Nuclear Science and Technology Organization's (ANSTO) KOWARI beamline through proposal P7881. The authors gratefully acknowledge the support provided by the ANSTO during the experiment. The Additive Manufacturing Research Laboratory (AMRL) at RISE IVF is acknowledged for manufacturing all the specimens and as the Centre for Additive Manufacturing ? Metal (CAM2) financed by Swedish Governmental Agency of Innovation Systems (Vinnova) for their financial support. The raw/processed data required to reproduce these findings cannot be shared at this time due to technical or time limitations.; Funding text 2: This research is funded by the Swedish Foundation for Strategic Research (SSF) within the Swedish national graduate school in neutron scattering (SwedNess) (grant number GSn15–0008 ). The neutron diffraction experiments were conducted at Australia Nuclear Science and Technology Organization’s (ANSTO) KOWARI beamline through proposal P7881. The authors gratefully acknowledge the support provided by the ANSTO during the experiment. The Additive Manufacturing Research Laboratory (AMRL) at RISE IVF is acknowledged for manufacturing all the specimens and as the Centre for Additive Manufacturing – Metal (CAM2) financed by Swedish Governmental Agency of Innovation Systems (Vinnova) for their financial support.
2022-01-262022-01-262023-06-08Bibliographically approved