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Additive manufacturing, or 3D printing, has largely developed in the last 5-10 years and a lot of companies were created by coming up with ingenious and new processes, Aerosint is one of them. Aerosint has developed the first Laser Powder Bed Fusion printing head that allows to print two materials at the same time.
In this work, some thermal properties of pure and bi-material parts are studied. The pure metallic parts are made out of CuCrZr and Maraging steel M300 and the bi-metallic parts are made out of a both. The evolution of the thermal diffusivity is studied for the as built printed parts and for two aging treatments, one at 520°C during 45 min and one at 520°C during 6h. Then the augmentation in diffusivity induced by the addition of copper on the steel is studied. After that a measurement of the evolution of the contact resistance between the two metals is led. Finally, a short study of the evolution of the grain size in the copper alloy is done thanks to the ASTM E112 standard.
The results show that for the CuCrZr the diffusivity is 3 times higher after 45 min of aging and stays stable after (from 30 to around 90 mm^2/s). For the M300 the diffusivity is multiplied by 1.1 for a heat treatment of 45 min and by 1.3 for a heat treatment of 6 hours (from 4.5 to 5.5 mm^2/s to 6.5 mm^2/s), so for the steel alloy the aging does not do much, at least in terms of diffusivity. The bi-material part has around 1.8 times better diffusivity than the steel alone for the as-built part and for the heat treated parts it is around 2.3 times better.
The contact resistance drops down to around 10% of its as built value after 45 min of heat treatment and then goes up again to around 15 of its as built value after 6h of heat treatment (from 1.5 x 10^(−5) to 1.7 x 10^(−6) m^2K/W).
The use of ASTM E112 says that the grain size does not change during the heat treatments and stays at around 6.

Additive manufacturing --- Aerosint --- Bi-material --- CuCrZr --- M300 --- Thermal diffusivity --- Thermal contact resistance --- Ingénierie, informatique & technologie > Ingénierie chimique

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Additive manufacturing (AM) is one of the manufacturing processes that warrants the attention of industrialists, researchers and scientists, because of its ability to produce materials with a complex shape without theoretical restrictions and with added functionalities. There are several advantages to employing additive manufacturing as the primary additive manufacturing process. However, there exist several challenges that need to be addressed systematically. A couple such issues are alloy design and process development. Traditionally alloys designed for conventional cast/powder metallurgical processes were fabricated using advanced AM processes. This is the wrong approach considering that the alloys should be coined based on the process characteristics and meta-stable nature of the process. Hence, we must focus on alloy design and development for AM that suits the AM processes. The AM processes, however, improve almost every day, either in terms of processing capabilities or processing conditions. Hence, the processing part warrants a section that is devoted to these advancements and innovations. Accordingly, the present Special Issue (book) focuses on two aspects of alloy development and process innovations. Here, 45 articles are presented covering different AM processes including selective laser melting, electron beam melting, laser cladding, direct metal laser sintering, ultrasonic consolidation, wire arc additive manufacturing, and hybrid manufacturing. I believe that this Special Issue bears is vital to the field of AM and will be a valuable addition.

microstructure --- slag --- crystallographic texture --- epoxy solder --- additive manufacturing --- substrate preheating --- thermosetting epoxy resin --- AlSi10Mg alloy --- impact --- residual stress --- stability lobe diagram --- laves phase --- vanadium --- selective laser melting (SLM) --- molten pool dynamic behavior --- scanning strategy --- pulse frequency --- thin-walled weak rigidity parts --- scanning --- aluminum --- elastic abrasive --- 2219 aluminum alloy --- Powder bed --- ABS --- laser energy density --- equivalent processing model --- composition --- numerical analysis --- scanning electron microscopy (SEM) --- Hastelloy X alloy --- regular mixing --- texture evolution --- graphene nano-sheets (GNSs) --- Electron Beam Melting --- powder bed fusion --- microstructural evolution --- Mg content --- cement --- bulk metallic glasses --- grain refinement --- Taguchi --- intermediate thermo-mechanical treatment --- valorization --- microstructure and properties --- arc current --- high computational efficiency --- powder properties --- dynamic characteristics --- composite materials --- CuAl2 phase --- rapid solidification --- magnetizer --- M300 mold steel --- circular economy --- titanium alloy --- Al–5Si alloy --- Al–Mg–Si alloy --- ultrasonic bonding --- water absorption --- disc brake --- support strategy --- inoculation --- arc additive manufacture --- 3D metal printing --- ultrafast laser --- Hot Isostatic Pressure --- arc additive manufacturing --- continuous carbon fiber --- performance characteristics --- process-damping --- intermetallic compound (IMC) --- interfaces --- direct metal laser sintering --- porosity --- nickel-based superalloy --- element segregation --- hydrophobicity --- H13 tool steel --- Cu50Zr43Al7 --- metal powders --- parameter optimization --- side spatters --- powder packing --- 3D printing --- precipitates --- n/a --- simulation --- laser cladding deposition --- melt pool size --- quenching rate --- Al–Mg alloy --- tailored properties --- workpiece scale --- fatigue --- laser cladding --- Ti-6Al-4V --- deformation --- quality of the as-built parts --- model --- milling --- wire feeding additive manufacturing --- martensitic transformation --- ball milling --- Inconel 718 --- ablation --- in-process temperature in MPBAM --- subgranular dendrites --- porosity reduction --- femtosecond --- paint bake-hardening --- Al6061 --- defects --- continuous dynamic recrystallization --- wear --- Additive manufacturing --- volumetric heat source --- Ti6Al4V alloy --- AlSi10Mg --- radial grooves --- GH4169 --- temperature and stress fields --- laser powder bed fusion --- metallic glasses --- numerical simulation --- latent heat --- divisional scanning --- wire lateral feeding --- laser powder bed fusion (LPBF) --- heat treatment --- thermal behaviour --- fused filament fabrication --- microstructures --- thermal conductivity --- 12CrNi2 alloy steel powder --- tensile strength --- hot stamping steel blanks --- multi-laser manufacturing --- aluminum alloys --- additive surface structuring --- parts design --- process parameters --- thermal stress analysis --- SLM process parameters --- nickel alloys --- Al–Si --- powder flowability --- laser power absorption --- refractory high-entropy alloy --- localized inductive heating --- mechanical properties --- selective laser melting --- storage energy --- concrete --- mechanical property --- gray cast iron --- constitutive model --- analytical modeling --- hot deformation --- epitaxial growth --- design --- flowability --- amorphous alloy --- PSO-BP neural network algorithm --- molten pool evolution --- microhardness measurement --- macro defects --- thermal capillary effects --- finite element analysis --- dynamic properties --- WxNbMoTa --- properties --- Al-5Si alloy --- Al-Mg-Si alloy --- Al-Mg alloy --- Al-Si