Microstructure and residual stress interactions in metal additive manufacturing: post-build assessment and new in-situ methods

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dc.contributor.authorOstergaard, HEen_AU
dc.contributor.authorParadowska, AMen_AU
dc.date.accessioned2023-09-14T06:18:48Zen_AU
dc.date.available2023-09-14T06:18:48Zen_AU
dc.date.issued2021-11-26en_AU
dc.date.statistics2023-04-27en_AU
dc.description.abstractLayer-wise addition of metal to directly form components or add coatings via laser powder bed fusion (LPBF) or laser directed energy deposition (DED) can generate very high levels of residual stress which affect component durability if not adequately addressed. These techniques also result in novel, non-equilibrium microstructures, sometimes with desirable features, that interact with traditional residual stress relief and microstructure manipulation heat treatments. In LPBF nickel superalloy 718, neutron diffraction was used to demonstrate that a complex residual stress state can persist through a non-recrystallising heat treatment at 960 ºC plus subsequent ageing. The same treatment has been previously shown to relieve residual stresses and promote grain growth in conventionally manufactured material. This discrepancy is attributed to the presence of nano-scale intercellular precipitates and a large concentration of existing dislocations, both consequences of the LPBF process, which act to impede recrystallisation and creep processes. The residual stress state is shown to influence the long-crack fatigue threshold at low stress ratios. Higher temperature annealing successfully relieved residual stresses but resulted in recrystallisation and grain growth which reduced the yield stress. To further explore residual stress and phase evolution during additive manufacturing, an in-beamline laser DED capability is being developed at ANSTO for both neutron and synchrotron use. © 2021 The Authorsen_AU
dc.identifier.articlenumber221en_AU
dc.identifier.citationOstergaard, H. & Paradowska, A. (2021). Microstructure and residual stress interactions in metal additive manufacturing: post-build assessment and new in-situ methods. Presentation to the ANSTO User Meeting, Online, 24-26 November 2021. Retrieved from: https://events01.synchrotron.org.au/event/146/contributions/4332/contribution.pdfen_AU
dc.identifier.conferenceenddate2021-11-26en_AU
dc.identifier.conferencenameANSTO User Meeting 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2021-11-24en_AU
dc.identifier.urihttps://events01.synchrotron.org.au/event/146/contributions/4332/contribution.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15119en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.relation.urihttps://events01.synchrotron.org.au/event/146/contributions/4332/contribution.pdfen_AU
dc.subjectMicrostructureen_AU
dc.subjectResidual stressesen_AU
dc.subjectInteractionsen_AU
dc.subjectMetalsen_AU
dc.subjectAdditivesen_AU
dc.subjectManufacturingen_AU
dc.subjectSurface coatingen_AU
dc.subjectHeat treatmentsen_AU
dc.subjectGrain growthen_AU
dc.titleMicrostructure and residual stress interactions in metal additive manufacturing: post-build assessment and new in-situ methodsen_AU
dc.typeConference Presentationen_AU
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