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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Panwisawas, Chinnapat
Queen Mary University of London
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024Pore evolution mechanisms during directed energy deposition additive manufacturingcitations
- 2024Pore evolution mechanisms during directed energy deposition additive manufacturing
- 2023Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloyscitations
- 2022Development, characterisation, and modelling of processability of nitinol stents using laser powder bed fusioncitations
- 2021Ultra-high temperature deformation in a single crystal superalloycitations
- 2021High Entropy Alloys as Filler Metals for Joiningcitations
- 2020Relating micro-segregation to site specific high temperature deformation in single crystal nickel-base superalloy castingscitations
- 2018Mean-field modelling of the intermetallic precipitate phases during heat treatment and additive manufacture of Inconel 718citations
- 2018History dependence of the microstructure on time-dependent deformation during in-situ cooling of a nickel-based single crystal superalloycitations
- 2018A computational study on the three-dimensional printability of precipitate-strengthened nickel-based superalloyscitations
- 2017The contrasting roles of creep and stress relaxation in the time-dependent deformation during in-situ cooling of a nickel-base single crystal superalloycitations
- 2017Keyhole formation and thermal fluid flow-induced porosity during laser fusion welding in titanium alloyscitations
- 2017Mesoscale modelling of selective laser meltingcitations
- 2016Porosity formation in laser welded Ti-6Al-4V Alloy: modelling and validation
- 2016Linking a CFD and FE analysis for Welding Simulations in Ti-6Al-4V
- 2016Linking a CFD and FE analysis for Welding Simulations in Ti-6Al-4V
- 2016An integrated modelling approach for predicting process maps of residual stress and distortion in a laser weldcitations
- 2015On the role of thermal fluid dynamics into the evolution of porosity during selective laser meltingcitations
- 2015On the role of melt flow into the surface structure and porosity development during selective laser meltingcitations
- 2013Modelling and prediction of recrystallisation in single crystal superalloys
- 2012Prediction of plastic strain for recrystallisation during investment casting of single crystal superalloyscitations
- 2011Numerical modelling of stress and strain evolution during solidification of a single crystal superalloycitations
Places of action
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article
Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloys
Abstract
A supersaturated 𝛾 phase microstructure is produced in Ni-based superalloys using laser powder bed fusion (LPBF) – the cooling rate arising from the process is shown to suppress the solid-state precipitation of the 𝛾′ phase. The response of the material to a heat treatment therefore requires new understanding at the fundamental level, since the first population of 𝛾′ precipitate forms upon heating, in contrast to cooling from homogenisation above the 𝛾′ solvus. Here, we have interrogated two new nickel-based superalloys designed for the L-PBF technology, both in situ and ex situ, at multiple length scales using advanced characterisation methods. First, we conducted in situ synchrotron X-ray diffraction during various heat treatments to trace the evolution of the 𝛾 ′ volume fraction with temperature. The first structural changes were detected at an unexpectedly low temperature of ∼445 ◦C. Second, the temperature for 𝛾′ nucleation and its sensitivity to heating rate was studied using an electrical resistivity method. Then, the 𝛾′ composition upon heating, isothermal holding and cooling is analysed using atom probe tomography (APT), the result is rationalised by further scanning-transmission electron microscopy and nanoscale secondary ion mass spectroscopy. Finally, static recrystallisation during isothermal exposure was investigated, which occurs within minutes. This work sheds light on a new strategy of tailoring microstructure for additively manufactured superalloys by manipulation of the 𝛾′ precipitate distribution upon heating.