Additive manufacturing letters最新文献_第2页

Corrigendum to “Reassessing the Biodegradation Behavior of Pure Iron and Iron-Manganese Alloys Fabricated by Laser Powder Bed Fusion” [ADDLET, 15 (2025) 100321]" “激光粉末床熔合制备的纯铁和铁锰合金的生物降解行为的再评估”[ADDLET, 15 (2025) 100321]

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Additive manufacturing letters

Pub Date : 2025-12-01 DOI: 10.1016/j.addlet.2025.100341

Fanshuo Wang , Qiyang Tan , Ting Liu , Jeffery Venezuela , Zhiming Shi , Sarah Hurley , Anh Ly , Chun Xu , Deniz U. Erbulut , Jun Yin , Yue Zhao , Mingxing Zhang

引用次数: 0

Multi-scale mechanical characterization of an additively manufactured Fe-based glass-forming alloy 增材制造铁基玻璃成形合金的多尺度力学特性

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-12-01 DOI: 10.1016/j.addlet.2025.100345

C. Garrote-Junco , A. Ghavimi , R. Busch , M.T. Pérez-Prado , M. Rodríguez-Sánchez

This work aims to investigate the influence of specimen size and loading direction on the mechanical response of a laser-powder-bed-fused (LPBF) Fe-based metallic glass (Kuamet 6B2). Cuboidal specimens of sizes ranging from 4 to 8 mm were fabricated and then systematically characterized by a range of complementary techniques including optical microscopy, image analysis, differential scanning calorimetry and electron backscattered diffraction (EBSD). All builds exhibited three highly oriented defect families: elongated lack-of-fusion pores perpendicular to BD, oblique internal cracks and large surface cracks normal to BD. These defects, along with limited amorphous retention, dominate the bulk compliance and strength.

The mechanical behavior was assessed by room temperature uniaxial compression, both parallel and perpendicular to the build direction (BD), as well as by nanoindentation. A clear, direction-dependent size effect emerges. Under loading parallel to BD, strength and uniform strain diminish with increasing specimen size, consistent with defect closure and the correlation between density and mechanical response. In contrast, when loading is perpendicular to BD, strength and uniform strain increase with size, due to the reduction of normalized defect length scales relative to specimen width. The ensuing drop in stress-intensity at defect tips, suppressing crack propagation. Nanoindentation on defect-free regions revealed substantially higher local stiffness than bulk values, underscoring that the macroscopic response is defect-controlled rather than matrix-controlled.

本研究旨在研究试样尺寸和加载方向对激光粉末床熔融（LPBF）铁基金属玻璃（Kuamet 6B2）力学响应的影响。利用光学显微镜、图像分析、差示扫描量热法和电子背散射衍射（EBSD）等辅助技术，制备了尺寸为4 ~ 8mm的立方体样品，并对其进行了系统表征。所有构建都表现出三个高度定向的缺陷家族：垂直于BD的细长的缺乏熔合孔，斜向的内部裂纹和垂直于BD的大表面裂纹。这些缺陷以及有限的非晶态保留，决定了整体顺应性和强度。通过室温单轴压缩，平行和垂直于构建方向（BD），以及纳米压痕来评估力学行为。一种明显的、方向依赖的规模效应出现了。在平行BD加载下，强度和均匀应变随试件尺寸的增大而减小，与缺陷闭合和密度与力学响应的相关性一致。相反，当加载方向垂直于试样宽度时，由于归一化缺陷长度尺度相对于试样宽度的减小，强度和均匀应变随尺寸增大而增大。缺陷尖端的应力强度随之下降，从而抑制了裂纹的扩展。无缺陷区域的纳米压痕显示出比体积值高得多的局部刚度，强调宏观响应是缺陷控制的而不是基体控制的。

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引用次数: 0

The efficacy of self-curing agents on enhanced internal curing and accelerated carbonation with CO2-steam integrated 3D concrete printing 自固化剂在co2 -蒸汽一体化3D混凝土打印中增强内固化和加速碳化的效果

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-12-01 DOI: 10.1016/j.addlet.2025.100339

Sean Gip Lim , Junghyun Lee , Nuran Khalid A. Bawarith , Suvash Chandra Paul , Jihye Jhun , Issam T. Amr , Bandar A. Fadhel , Ming Jen Tan

Construction industry, responsible for a substantial portion of global carbon emissions, faces an urgent demand to adopt sustainable practices. Traditional concrete manufacturing processes contribute significantly to these emissions, underscoring a pressing need for innovative technologies that not only reduce carbon footprint but also improve material performances. This study presents an extension of CO₂-steam integrated 3D construction printing by incorporating functional self-curing agents, specifically Polyethylene Glycol (PEG-6000), to enhance both early-age carbonation reactions and mechanical strength developments of 3D printed cementitious materials. The presented method aims to suppress moisture loss that delays hydration and carbonation activities during unconfined atmospheric curing, which would otherwise hinder strength developments. The combined usage of in-situ CO₂-steam printing with PEG-6000 demonstrated improvements in early-age carbon uptake up to 137 %, along with substantial developments in compressive, flexural, and interlayer bond strengths of up to 29.4 %, 51.9 %, and 36.5 %, respectively.

建筑业占全球碳排放量的很大一部分，迫切需要采用可持续的做法。传统的混凝土制造工艺大大增加了这些排放，强调了对创新技术的迫切需求，这些技术不仅可以减少碳足迹，还可以提高材料性能。本研究通过加入功能性自固化剂，特别是聚乙二醇（PEG-6000），提出了二氧化碳蒸汽集成3D建筑打印的扩展，以增强早期碳化反应和3D打印胶凝材料的机械强度。提出的方法旨在抑制在无侧限大气固化过程中延迟水化和碳酸化活动的水分损失，否则会阻碍强度的发展。原位二氧化碳蒸汽印刷与PEG-6000的结合使用表明，早期碳吸收率提高了137%，压缩、弯曲和层间结合强度分别提高了29.4%、51.9%和36.5%。

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引用次数: 0

Influence of Strut Shape on the As-Built Quality and Mechanical Performance of Additively Manufactured Simple Cubic Lattices 支撑形状对增材制造简单立方格的成形质量和力学性能的影响

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-12-01 DOI: 10.1016/j.addlet.2025.100346

Derui Jiang , Darren Fraser , Sherman Wong , Timothy C. Hughes , Robert Wilson , Anthony B. Murphy , Vu Nguyen

Lattice structures made by additive manufacturing (AM) are being widely studied in the field of biomedical applications. Their strength and dimensional accuracy are critical to their performance. This study explores how different strut shapes affect the as-built quality and mechanical performance of Grade 23 titanium (Ti64) simple cubic lattices made by electron beam melting (EBM). Three strut cross-section geometries, square, octagonal, and round, were evaluated. Micro-computed tomography (CT) was used to assess dimensional deviations. Finite-element stress analysis predicted the mechanical response. Compression tests were conducted in two orientations to validate the models. Square struts showed the highest geometric accuracy and the best compressive strength, followed by the octagonal and round struts. These geometric deviations translated into mechanical trends: the square-strut lattices showed ∼10 – 20 % higher stiffness and yielding load compared with the round-strut equivalents, with the octagonal struts performing intermediately. These results suggest that square struts are better suited for load-bearing implants. The findings provide guidance for designing more reliable and effective lattice-based medical devices.

增材制造（AM）制造的点阵结构在生物医学应用领域得到了广泛的研究。它们的强度和尺寸精度对它们的性能至关重要。本研究探讨了电子束熔炼（EBM）制备的23级钛（Ti64）简单立方晶格的不同支撑形状对竣工质量和力学性能的影响。评估了三种支柱截面几何形状，方形、八角形和圆形。显微计算机断层扫描（CT）用于评估尺寸偏差。有限元应力分析预测了力学响应。在两个方向上进行了压缩试验来验证模型。方形支撑的几何精度最高，抗压强度最好，其次是八角形支撑和圆形支撑。这些几何偏差转化为力学趋势：与圆形支撑相比，方形支撑的刚度和屈服载荷高出10 - 20%，而八角形支撑的表现居中。这些结果表明，方柱更适合于承重种植体。研究结果为设计更可靠、更有效的栅格医疗设备提供了指导。

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引用次数: 0

High-temperature deformation behavior of additively manufactured niobium alloys from in-house gas-atomized feedstock 内部雾化进料增材制造铌合金的高温变形行为

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-12-01 DOI: 10.1016/j.addlet.2025.100342

John P. Reidy , Catherine Ott , Alexandra J. Barbosa , Fernando Reyes Tirado , Gianna M. Valentino , Ian McCue

Nb-base alloys offer excellent high-temperature properties, but many legacy compositions were sidelined due to poor machinability. Additive manufacturing (AM) provides a pathway to bypass these limitations while simultaneously producing heterogeneous microstructures that can enhance performance. In this work, the legacy alloy Cb752 was gas-atomized to produce spherical powder feedstock for laser powder bed fusion, and a modified powder variant was prepared by tumbling HfC nanoparticles with the base powder. Tensile specimens were fabricated from both powders under optimized laser parameters, alongside arc-melted Cb752 for comparison. Compared to arc-melted Cb752, AM specimens exhibited consistently higher strength across 800–1600°C due to stable subgrain dislocation networks that delay recrystallization and enhance strain hardening. The HfC additions further stabilized these networks, improving post-yield performance at intermediate temperatures, though their contribution diminished after particle coarsening at 1600°C. These findings demonstrate that custom atomization and feedstock modification can unlock new performance in Nb-base alloys and provide a generalizable strategy for advancing refractory alloy systems through tailored AM processing.

铌基合金具有优异的高温性能，但许多传统成分由于可加工性差而被搁置。增材制造（AM）提供了一种绕过这些限制的途径，同时生产可以提高性能的异质微结构。在这项工作中，将传统合金Cb752气体雾化制备球形粉末原料用于激光粉末床熔合，并通过将HfC纳米颗粒与基粉翻滚制备改性粉末变体。在优化的激光参数下，用两种粉末制备拉伸试样，并与弧焊Cb752进行比较。与弧熔Cb752相比，AM试样在800-1600°C范围内表现出更高的强度，这是由于稳定的亚晶位错网络延迟了再结晶并增强了应变硬化。HfC的加入进一步稳定了这些网络，提高了中间温度下的产后性能，尽管在1600℃下颗粒粗化后，它们的贡献减少了。这些发现表明，定制雾化和原料改性可以解锁铌基合金的新性能，并为通过定制增材制造工艺推进耐火合金系统提供了一种通用策略。

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引用次数: 0

Mode shape-informed design of lightweight metal lattice structures produced by laser powder bed fusion for enhanced dynamic properties 基于模态形状的激光粉末床熔合轻质金属晶格结构动态性能优化设计

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-12-01 DOI: 10.1016/j.addlet.2025.100347

Berk Baris Celik , Amir Hossein Mirzaei , Nima Razavi , Brecht Van Hooreweder

Metallic lattice structures are increasingly employed in advanced engineering applications where a high strength-to-weight ratio and enhanced dynamic response are required. Recent studies on functionally graded lattice structures show that these structures stand out for their tuneable properties. This study presents novel insights into the mechanical and dynamic properties of modal simulation-driven, density-gradient strut-based lattices fabricated from aluminum A205 powder using laser powder bed fusion (LPBF). Cubic bounding volume diamond unit cell lattice specimens with identical mass and four distinct gradient profiles were designed. One specimen without a density gradient and three with mode shape-informed density gradients were included in the study. A new printing parameter set was developed to enable density gradient samples to be printed at high material densities and in a robust manner. Modal and static finite element simulations were conducted to validate the dynamic property optimization of density gradient structures. Impulse excitation technique (IET) tests showed that the field-optimized design (FO) has an increase of 23.7% and 16.1% in natural frequency in two different modes, and an increase of 130% and 45% in damping capacity in the same modes, compared to the uniform density sample (NG). Compression tests showed that FO was slightly less stiff but had better maximum compressive stress values than NG. FO also outperformed the other three designs in terms of energy absorption. Despite being optimized for natural frequency and damping capacity, FO demonstrated acceptable fatigue performance with hysteresis analyses indicating greater energy dissipation per cycle than the uniform lattice design. The insights and results from this work therefore opens new opportunities for creating lightweight yet high-performance and multifunctional metal lattice structures.

金属晶格结构越来越多地应用于需要高强度重量比和增强动态响应的先进工程应用中。最近对功能梯度晶格结构的研究表明，这些结构具有可调谐的特性。本研究对模态仿真驱动、密度梯度支撑型晶格的力学和动态特性提出了新的见解，这些晶格是由A205铝粉末用激光粉末床熔合（LPBF）制成的。设计了具有相同质量和四种不同梯度轮廓的立方边界体菱形单元胞晶格试样。一个没有密度梯度的样品和三个有模态形状的密度梯度被包括在研究中。开发了一种新的打印参数集，以使密度梯度样品能够以高材料密度和稳健的方式打印。进行了模态和静力有限元仿真，验证了密度梯度结构的动态性能优化。脉冲激励技术（IET）试验表明，与均匀密度样品（NG）相比，现场优化设计（FO）在两种不同模式下的固有频率分别提高了23.7%和16.1%，在相同模式下的阻尼能力分别提高了130%和45%。压缩试验表明，FO的刚度略低于NG，但其最大压应力值优于NG。FO在能量吸收方面也优于其他三种设计。尽管对固有频率和阻尼能力进行了优化，但FO显示出可接受的疲劳性能，迟滞分析表明，与均匀晶格设计相比，FO每循环的能量耗散更大。因此，这项工作的见解和结果为创造轻质、高性能和多功能的金属晶格结构开辟了新的机会。

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引用次数: 0

Binder-jet printing and pressure-controlled infiltration for fabrication of high-temperature, low-dead-volume microfluidic interfaces 用于制造高温、低死体积微流体界面的粘合剂喷射打印和压力控制渗透

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-11-25 DOI: 10.1016/j.addlet.2025.100344

Henry D. Davis , James G. Harkness , David K. Hayes , Brian D. Jensen , Richard Vanfleet , Nathan B. Crane , Robert C. Davis

Interfacing is a consistent weak point in the manufacturing of microscale gas chromatography columns. Current techniques for interfacing with microfluidic systems often degrade under high temperatures and thermal cycling and suffer from dead volumes. To address these challenges, we fabricated all-metal interfaces that connect 3D-printed microchannels (500 µm diameter) to industry-standard stainless-steel (SS) capillaries. Our fabrication process uses SS binder-jet printing and bronze infiltration to fuse the capillary to the printed part and reduce dead volumes at the interface while utilizing pressure control to prevent the infiltrant from filling the channel or capillary. These interfaces withstood pressures greater than 100 PSI and showed no leakage after thermal cycling to 350 °C. Cross-sections of the interfaces show smooth connections between the channel and capillary with minimal dead volume.

界面一直是制造微型气相色谱柱的薄弱环节。目前的微流体系统接口技术在高温和热循环下往往会退化，并且存在死体积问题。为了应对这些挑战，我们制造了全金属接口，将3d打印微通道（直径500微米）连接到工业标准的不锈钢（SS）毛细血管。我们的制造工艺采用SS粘结剂喷射打印和青铜渗透，将毛细管与打印部件融合在一起，减少界面处的死体积，同时利用压力控制来防止渗透物填充通道或毛细管。这些界面可以承受大于100 PSI的压力，并且在350°C的热循环后没有泄漏。界面的横截面显示通道和毛细管之间的连接平滑，死体积最小。

引用次数: 0

Track cross-sectional profile model for time-invariant deposition processes — Applied to cold spray and aerosol jet printing 定常沉积过程的轨迹截面模型。应用于冷喷涂和气溶胶喷射打印

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-11-08 DOI: 10.1016/j.addlet.2025.100338

Alexander Martinez-Marchese , Alex-George Miclaus , Bahareh Marzbanrad , Ehsan Marzbanrad , Chen Qian , Max Wörner , Hamid Jahed , Ehsan Toyserkani , Chinedum Okwudire

Modeling the track cross-sectional profile (CSP) in deposition processes is critical for assessing and controlling deposition quality. This article focuses on modeling time-invariant deposition (TID) processes, where deposited material does not move after impact with the evolving surface, and deposition efficiency remains constant. For a TID process, the CSP can be computed from the mass flux distribution using the Abel integral transform. The model is validated for cold spray (CS) and aerosol jet printing. Using the TID assumption enables the modeling of CS and AJP tracks from dot deposition data with height and width errors down to 11 and 22% for CS, and 7 and 21% for AJP. The error of this model when considering short and curved tracks is discussed, as well as the effects of nozzle standoff distance and tilt. Fast methods for arbitrary CSP computations and a fast CS method considering varying deposition efficiency are also discussed.

沉积过程轨迹截面曲线（CSP）的建模是评价和控制沉积质量的关键。本文重点对时不变沉积（TID）过程进行建模，即沉积材料在与不断变化的表面碰撞后不移动，沉积效率保持恒定。对于TID过程，CSP可以用阿贝尔积分变换从质量通量分布计算得到。该模型在冷喷涂和气溶胶喷射打印中得到了验证。利用TID假设，可以根据点沉积数据对CS和AJP轨迹进行建模，CS的高度和宽度误差分别为11%和22%，AJP的高度和宽度误差分别为7%和21%。讨论了该模型在考虑短轨迹和弯曲轨迹时的误差，以及喷管距和倾斜的影响。讨论了任意CSP计算的快速方法和考虑沉积效率变化的快速CS方法。

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引用次数: 0

3D-printed carbon fiber meta-skins for impact mitigating sandwich structures 3d打印碳纤维元皮肤，用于减轻夹心结构的冲击

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-10-30 DOI: 10.1016/j.addlet.2025.100337

Sean Eckstein , Sophia Benkirane , George Youssef

The intersection between additive manufacturing and metamaterials reinvigorated the pursuit of optimal protective structures in civilian and military applications by challenging the process-structure-performance nexus. This letter introduces a novel subclass of mechanical metamaterials, termed meta-skins, which are printed with continuous carbon fiber composites in pseudo-woven patterns to achieve higher impact efficacy-to-weight ratios. High-performance elastomeric foam cores were adhered to the carbon fiber meta-skins in two configurations: monocoque and sandwich. The impact efficacy was evaluated using direct impact loading scenarios at 4.43 m/s and 15 m/s, respectively, using a fully instrumented drop tower and a small-scale shock tube. Digital image correlation (DIC) revealed the full-field kinematics of deformation as a function of strain rate. Postmortem failure analysis cross-referenced the dynamic mechanical behavior with the failure modes, epitomizing the interrelation between sample configuration and impact efficacy. Generally, monocoque structures outperformed their sandwich counterparts under low-velocity impacts, whereas the opposite was observed under moderate-velocity loading conditions, such that the performance of the sandwich structures surpassed that of the monocoque structures in nearly all dynamic evaluation metrics. Moreover, the meta-skin-capped specimens outperformed their cross-ply benchmarks by 15 % under similar impact events, demonstrating the novelty of the newly introduced subclass of metamaterials. The research outcomes unlock the scientific and technological potential of the next generation of protective armors by leveraging advanced weaving and fiber materials.

增材制造和超材料之间的交叉通过挑战工艺-结构-性能关系，重新激活了对民用和军事应用中最佳防护结构的追求。这封信介绍了一种新的机械超材料子类，称为meta-skin，它是用伪编织图案的连续碳纤维复合材料印刷的，以实现更高的冲击效率-重量比。高性能弹性体泡沫芯以两种结构粘接在碳纤维元皮上：单体结构和夹层结构。在4.43 m/s和15 m/s的直接冲击载荷情况下，使用全仪器仪表的跌落塔和小型激波管分别评估了冲击效果。数字图像相关（DIC）揭示了变形作为应变速率函数的全场运动。事后失效分析交叉引用了动态力学行为和失效模式，体现了试样形态与冲击效能之间的相互关系。总体而言，单壳结构在低速冲击下的性能优于夹层结构，而在中速加载条件下则相反，在几乎所有的动力评价指标中，夹层结构的性能都优于单壳结构。此外，在类似的冲击事件下，超皮肤覆盖的样品比交叉层基准高出15%，证明了新引入的超材料子类的新颖性。研究成果通过利用先进的编织和纤维材料，解锁了下一代防护装甲的科学和技术潜力。

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引用次数: 0

Isolating the influence of residual stress on tensile behaviour of laser-based powder bed fusion Ti alloys via mechanical stress relief 通过机械应力释放分离残余应力对激光基粉末床熔合钛合金拉伸行为的影响

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters

Pub Date : 2025-10-28 DOI: 10.1016/j.addlet.2025.100336

Zhiyi Zou , Brandon McWilliams , Brady Butler , Alexander Butler , Richard Hague , Marco Simonelli

This study proposes a mechanical stress relief (MSR) process to reduce the residual stress in PBF-LB materials. It involves progressive, slow cyclic loading in the material’s elastic region. Two Ti alloys, Ti-6Al-4V and Ti-7Cr-4Sn, were chosen as model alloys and underwent MSR accordingly. Results suggest that the proposed MSR helps reduce residual stress, and its effectiveness in relieving residual stress is similar across the two alloys. However, the influence of MSR on the tensile performance is different in the two alloys, which is affected by the initial residual stress level and the material’s deformation mechanism. Ti-6Al-4V possesses high residual stress, with deformation slip being the only deformation mechanism. In contrast, Ti-7Cr-4Sn possesses relatively low residual stress, and a unique deformation mechanism involves {332}<113> twinning and ω_iso precipitates. Such a unique deformation mechanism leads to crack initiation driven by twin-confined dislocation pile-up.

本研究提出了一种机械应力消除（MSR）工艺来降低PBF-LB材料的残余应力。它涉及材料弹性区域的渐进、缓慢循环加载。选择Ti- 6al - 4v和Ti- 7cr - 4sn两种钛合金作为模型合金，进行MSR试验。结果表明，所提出的MSR有助于降低残余应力，并且其消除残余应力的效果在两种合金中是相似的。然而，MSR对两种合金拉伸性能的影响是不同的，这受初始残余应力水平和材料变形机制的影响。Ti-6Al-4V具有较高的残余应力，变形滑移是其唯一的变形机制。相比之下，Ti-7Cr-4Sn具有相对较低的残余应力，其独特的变形机制涉及{332}<；113>；孪晶和ωiso析出。这种独特的变形机制导致双约束位错堆积驱动裂纹萌生。

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引用次数: 0