ADCOM’s Post

The article “Systematic Investigation of Performance and Productivity in Laser Powder Bed Fusion of Ti6Al4V up to 300 µm Layer Thickness” is now available in the Journal of 𝐌𝐚𝐭𝐞𝐫𝐢𝐚𝐥𝐬 𝐏𝐫𝐨𝐜𝐞𝐬𝐬𝐢𝐧𝐠 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐲 (open access link: https://lnkd.in/gf_sfcUH). In this paper, the authors examine how an increase in layer thickness affects microstructure, mechanical properties, relative density, and overall productivity of Ti6Al4V components manufactured by laser powder bed fusion. In contrast to the conventional range of layer thickness, typically from 20 µm to 60 µm, this study systematically investigates process-property-relationships for powder layers between 60 µm and 300 µm thickness. The findings underline the effectivity of increased layer thickness to improve productivity in laser powder bed fusion while maintaining high levels of relative density and strength. The research pushes the boundaries of processability and productivity for laser powder bed fusion, enabling more rapid fabrication of high-quality Ti6Al4V components for applications in the medical, defence, and aerospace sectors. Congratulations to all the authors Simon Brudler, Alexander Medvedev, C. Pandelidi, S. Piegert, T. Illston, Ma Qian and Milan Brandt on their wonderful work. 👏 🌺 #additivemanufacturing #3dprinting #RCAM #powderbedfusion #rmituniversity

Unlike conventional materials, auxetic metamaterials expand laterally when stretched and contract when compressed, defying the natural behavior observed in most substances. Their ability to efficiently absorb and dissipate energy positions them as promising candidates for innovations in impact resistance, shock absorption, and advanced engineering applications. The re-entrant auxetic structure under compression test rotates leading to the energy dissipation and prevention of higher stresses. Fused filament fabrication (FFF) as an additive manufacturing method was used to fabricate the structure from TPU (Thermoplastic polyurethane). #additivemanufacturing #metamaterials #auxetic #compression

💡 #Didyouknow? Most substances get thinner when pulled and thicker when squeezed. Auxetic metamaterials are different from conventional materials because they do the opposite: they get thicker when pulled and thinner when squeezed, having a negative Poisson's ratio. 📽️ Watch them in action as presented by Hadi Bakhshan, PhD candidate at the Structural Mechanics research group at the International Centre for Numerical Methods in Engineering, CIMNE #innovation #research #CIMNE #materialsscience #engineering

AM Friends, If you are interested in microstructure control of additively manufactured materials, then check out this new in-depth paper from University of Kassel. They have explored different beam scanning strategies in Electron Beam Powder Bed Fusion of Inconel 718. Conventional "line melting" results in columnar grain growth whereas "spot melting" gives a fine-grained, weakly textured and equiaxed microstructure. Yet another good example of how the extremely high deflection speed of the electron beam opens up opportunities for tailoring microstructures. This is not an open-access paper, but it is certainly worth paying for if the topic is of interest. #additivemanufacturing #3dprinting #epbf #spotmelting #microstructure

Evaluation of microstructure heterogeneity in INCONEL 625 thin-wall fabricated by Laser Powder Bed Fusion additive manufacturing https://lnkd.in/gnzqwcUe

Microstructure and mechanical properties of bulk NiTi shape memory alloy fabricated using directed energy deposition: In our article just published in Additive Manufacturing (Elsevier), we report the fabrication of large NiTi square bars by directed energy deposition (DED) X-ray diffraction detected only the B2 phase in the bottom, center and top sections. A surprising mechanical behavior is reported, for the first time, where the middle section exhibits the lowest Young’s and shear moduli (based on an ultrasonic pulse-echo test) and the highest microhardness. Atom probe tomography (APT) allowed to rationalize the anomalous mechanical behavior based on the formation of a fine dispersion of Ni4Ti3 nanoprecipitates with the highest volume fraction in the middle section. These microstructural and mechanical heterogeneities have both fundamental and practical implications.

++ new publication on aluminium additive manufacturing ++ “Microstructure, tensile strength, and hardness of AA5024 modified with ZrH4 additions produced by laser powder bed fusion” The #AdditiveManufacturing of #AluminiumWroughtAlloys with the #LaserPowderBedFusion (L-PBF) process has been increasingly studied in recent years. As these alloys are susceptible to hot cracking, wrought aluminium alloys represent a tremendous challenge for L-PBF manufacturing. One possible way to reduce the susceptibility to hot cracking is to modify these alloys with nanoparticles. Our latest publication shows the successful #modification of #AA5024, a promising material for high-performance parts in the automotive and aerospace industries, with ZrH4 #nanoparticles! A significant grain refinement was achieved, which was accompanied by an increase in mechanical properties, i.e. hardness and tensile strength! A detailed microstructural study was carried out to comprehensively understand the effects of the ZrH4 addition! Authors: Lisa Minkowitz, Ricardo Henrique Buzolin, Siegfried Arneitz and Sergio T. Amancio Filho. DOI: https://lnkd.in/dWZHdCaa #AdditiveManufacturing #LaserPowderBedFusion #AA5024 #InSituAlloying #ZrH4 #AlloyModification Figure: Schematic representation of the in-situ alloying process: premixing of the raw powders, L-PBF processing of the samples, heat treatment and microstructural characterisation. (a) Shows the modification of the AA5024 raw powder with ZrH4 nanoparticles; in (b) an SEM image shows the ZrH4 particles in a melt pool; in (c) and (d) the grain refinement due to ZrH4 particle addition can be seen in EBSD images when the ZrH4 content is increased from 0.5 to 5 wt.%.

AM Friends, Titanium alloys have been continuously developed for additive manufacturing for more that two decades, and among them, the "workhorse" Ti-6Al-4V is attracting the main interest. See below a new review of fusion-based AM of titanium alloys. It mentions about 20 alloys processed with the AM technologies PBF-LB, PBF-EB, DED-LB and DED-Arc. With almost 400 references, it is probably a good source of information. I'll put it on my reading list. :-) "A two-decade odyssey in fusion-based additive manufacturing of titanium alloys and composites", https://lnkd.in/gHQFkDQa #additivemanufacturing #3dprinting #titanium #Ti6Al4V #titaniumalloys #freemelt ***This post was written without AI***

Titanium powder is a critical material in the additive manufacturing (AM) industry, particularly for applications requiring high strength, low weight, and excellent corrosion resistance. These components are utilised in a range of industries from aerospace components such as turbines and airframe parts, medical devices, implants and prosthetics to marine equipment and chemical processing plants. Some of the characteristics and benefits include: 🛩️ High Strength-to-Weight Ratio: Titanium offers a superior strength-to-weight ratio compared to many other metals, making it ideal for aerospace, automotive, and biomedical applications where weight reduction is crucial. 🌊 Corrosion Resistance: Titanium's excellent resistance to corrosion, particularly from seawater and chlorine, makes it suitable for marine and chemical processing industries. 🌱 Biocompatibility: In the biomedical field, titanium is favoured for implants and prosthetics due to its compatibility with the human body and its ability to bond with bone. 🔥 Heat Resistance: Titanium maintains its mechanical properties at high temperatures, making it suitable for parts exposed to extreme heat, such as turbine blades and engine components. Titanium powder plays an essential role in the additive manufacturing industry, driving innovation and enabling the production of high-performance components across various sectors. Its unique properties make it indispensable for applications demanding lightweight, durable, and biocompatible materials, despite the challenges associated with its cost and processing. As AM technologies continue to evolve, the use of titanium powder is expected to expand, further revolutionising manufacturing processes and applications. Our atomisers have the capabilities to process quality spherical titanium powder. Why not contact us today to discuss your future requirements info@metalpowderprocess.co.uk. 01323 484004 | https://lnkd.in/eUSNEccV #Atomiser #PowderMetallurgy #TitaniumPowder #AdditiveManufacturing #Aerospace #MetalPowder #3DPrinting #Titanium

Deformable micro-supercapacitor fabricated via laser ablation patterning of Graphene/liquid metal Nature https://lnkd.in/g5wkJ8mZ