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Engineered Regeneration 2022年第1期3卷 41-52页

作者： Michael Ly Sarah Spinelli Shayne Hays Donghui Zhu Department of Biomedical Engineering Stony Brook University100 Nicolls RdStony BrookNY 11794United States

Bioceramics are a popular class of materials used in biomedical applications due to their mechanical stability and *** exist in a variety of fields including hip joints for orthopedics,tooth fillings for dentistry,and scaffolds for tissue engineering;however,the standard processes currently used to manufacture these ce-ramic products can be time-consuming and *** response,current literature alternatively proposes additive manufacturing(3D printing)strategies to fabricate bioceramic materials in a cost-effective and efficient ***,we briefly cover five common processes and materials used in additive manufacturing bioceramics:fused deposition modeling,material jetting,binder jetting,powder bed fusion,and vat ***-thermore,we discuss the potential of these 3D printed ceramic structures when applied to different biomedical technologies such as bone tissue scaffolds and structural implants.

关键词： Extrusion Binder jetting Material jetting powder bed fusion Vat photopolymerization

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Effect of processing parameters on the densification of an additively manufactured 2024 Al alloy

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Journal of Materials Science & Technology 2020年第23期58卷 34-45页

作者： Qiyang Tan Yingang Liu Zhiqi Fan Jingqi Zhang Yu Yin Ming-Xing Zhang School of Mechanical and Mining Engineering The University of QueenslandSt.LuciaQLD 4072Australia

Understanding the densification behaviours and formation mechanisms of defects are essential to fabricate high quality and high strength aluminium components using selective laser melting(SLM) technology. In this work, the effects of laser power and scanning speed on the densification, defects evolution and their formation mechanisms in a SLMed 2024 aluminium(Al) alloy were investigated in consideration of the corresponding laser energy input, melting mode transition and microstructural evolution. The results showed that optimizing the processing parameters effectively reduced the porosity level below1% by avoiding the lack of fusion and keyhole melting mode, and minimizing the gas pores. However,optimization of the processing parameters could not eliminate the columnar structure associated with the SLMed 2024 Al alloy, which contributed to the hot-tearing cracks in the SLMed parts. It was found that the dependence of porosity formation on SLM processing parameters was contrary to the crack density. Hence, to further improve the SLM-processability of the 2024 Al alloy it is necessary to develop SLM methods in order avoid the hot-cracking within the optimized processing parameter window associated with the minimum porosity formation.

关键词： powder bed fusion Aluminum alloys Metallography Defects SEM

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Optimization of the heat treatment of additively manufactured Ni-base superalloy IN718

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International Journal of Minerals,Metallurgy and Materials 2020年第5期27卷 640-648页

作者： Benedikt Diepold Nora Vorlaufer Steffen Neumeier Thomas Gartner Mathias Goken Department of Materials Science&Engineering Institute IFriedrich-Alexander-Universitat Erlangen-NürnbergErlangen 91058Germany Lufthansa Technik AG Hamburg 22335Germany

Additive manufacturing(AM) of Ni-base superalloy components can lead to a significant reduction of weight in aerospace applications. AM of IN718 by selective laser melting results in a very fine dendritic microstructure with a high dislocation density due to the fast solidification process. The complex phase composition of this alloy, with three different types of precipitates and high residual stresses, necessitates adjustment of the conventional heat treatment for AM parts. To find an optimized heat treatment, the microstructures and mechanical properties of differently solution heat-treated samples were investigated by transmission and scanning electron microscopy, including electron backscatter diffraction, and compression tests. After a solution heat treatment(SHT), the Nb-rich Laves phase dissolves and the dislocation density is reduced, which eliminates the dendritic substructure. SHT at 930 or 954°C leads to the precipitation of the δ-phase, which reduces the volume fraction of the strengthening γ′-and γ′′-phases formed during the subsequent two stage aging treatment. With a higher SHT temperature of 1000°C, where no δ-phase is precipitated, higher γ′ and γ′′ volume fractions are achieved, which results in the optimum strength of all of the solution heat treated conditions.

关键词： Ni-base superalloy selective laser melting strengthening mechanism powder bed fusion microstructure

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Plastic deformation of a Zr-based bulk metallic glass fabricated by selective laser melting

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Journal of Materials Science & Technology 2021年第1期60卷 139-146页

作者： L.Deng K.Kosiba R.Limbach L.Wondraczek U.Kühn S.Pauly IFW Dresden Institute for Complex MaterialsHelmholtzstraße 20D-01069DresdenGermany Otto Schott Institute of Materials Research University of JenaFraunhoferstraße 6D-07743JenaGermany University of Applied Sciences Aschaffenburg Würzburger Straße 45D-63743AschaffenburgGermany

Fully amorphous Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_(5) bulk metallic glass(BMG) samples with a relative density exceeding 98% were fabricated via selective laser melting(SLM).High fracture stresses of around1700 MPa and a reproducible plastic strain of about 0.5% were obtained for cylindrical SLM *** analysis of the observed serrations during compressive loading implies that the shear-band dynamics in the additively manufactured samples distinctly differ from those of the as-cast *** phenomenon appears to originate from the presence of uniformly dispersed spherical pores as well as from the more pronounced heterogeneity of the glass itself as revealed by instrumented *** these heterogeneities,the shear bands are straight and form in the plane of maximum shear *** manufacturing,hence,might not only allow for producing large BMG samples with complex geometries but also for manipulating their deformation behaviour through tailoring porosity and structural heterogeneity.

关键词： powder bed fusion Selective laser melting Bulk metallic glass Serrated flow Heterogeneity

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Additive manufacturing technology for porous metal implant applications and triple minimal surface structures: A review

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Bioactive Materials 2019年第1期4卷 56-70页

作者： Li Yuan Songlin Ding Cuie Wen School of Engineering RMIT UniversityBundooraVictoria3083Australia

Recently,the fabrication methods of orthopedic implants and devices have been greatly *** manufacturing technology allows the production of complex structures with bio-mimicry features,and has the potential to overcome the limitations of conventional fabrication *** review explores open-cellular structural design for porous metal implant applications,in relation to the mechanical properties,biocompatibility,and *** types of additive manufacturing techniques including selective laser sintering,selective laser melting,and electron beam melting,are discussed for different *** manufacturing through powder bed fusion shows great potential for the fabrication of high-quality porous metal ***,the powder bed fusion technique still faces two major challenges:it is high cost and *** addition,triply periodic minimal surface(TPMS)structures are also analyzed in this paper,targeting the design of metal implants with an enhanced biomorphic environment.

关键词： Additive manufacturing powder bed fusion Porosity TPMS structures

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Crack Types, Mechanisms, and Suppression Methods during High-energy Beam Additive Manufacturing of Nickel-based Superalloys: A Review

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第4期1卷 51-77页

作者： Qingsong Wei Yin Xie Qing Teng Muyu Shen Shanshan Sun Chao Cai State Key Laboratory of Materials Processing and Die&Mould Technology School of Material Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

Nickel-based superalloys have been widely used in aerospace fields,especially for engine hot-end parts,because of their excellent high-temperature ***,they are difficult to machine and process because of their special ***-energy beam additive manufacturing(HEB-AM)of nickel-based superalloys has shown great application potential in aerospace and other ***,HEB-AM of nickel-based superalloys faces serious cracking problems because of the unique characteristics of superalloys,and this has become the most significant bottleneck restricting their *** this review,the current research status related to the types,formation mechanisms,and suppression methods of cracks in nickel-based superalloys produced by HEB-AM is *** initiation and propagation mechanisms of cracks and their multiple influencing factors are also analyzed and ***,several possible research directions to solve the cracking problems in nickel-based superalloys produced by HEB-AM are *** review provides an in-depth and comprehensive understanding of the cracking problem in AM nickel-based *** also provides valuable references for AM crack-free nickel-based superalloy components.

关键词： High-energy beam Additive manufacturing powder bed fusion Directed energy deposition Nickel-based superalloys Cracks

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