Additive manufacturing最新文献_第7页

Efficient continuum-based modelling and analysis of polymer SLS: Insights into particle sintering and densification in straight and corner scanning passes 高效的基于连续体的聚合物SLS建模和分析：直扫和角扫过程中颗粒烧结和致密化的见解

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-13 DOI: 10.1016/j.addma.2025.104828

J. Hesselvig, R.T. Nygaard, M.K. Budzik, M. Sandberg

{"title":"Efficient continuum-based modelling and analysis of polymer SLS: Insights into particle sintering and densification in straight and corner scanning passes","authors":"J. Hesselvig, R.T. Nygaard, M.K. Budzik, M. Sandberg","doi":"10.1016/j.addma.2025.104828","DOIUrl":"10.1016/j.addma.2025.104828","url":null,"abstract":"<div><div>Selective Laser Sintering (SLS) is a widely used additive manufacturing technique that enables the production of complex polymer components. However, the sintering process involves complex thermal and material flow interactions that influence densification, shrinkage, and hence final part quality. This study presents a novel continuum-based numerical model for polymer SLS, validated through experimental investigations using PA12 powder. The model captures key sintering characteristics, including heat accumulation, powder shrinkage, and densification, at a fraction of the computational cost of traditional Discrete Element Method (DEM) approaches. A key finding of this study is the identification of oversintering effects at sharp corners, where heat accumulation leads to increased strand width and unexpected material redistribution—an effect not previously reported in the literature. Experimental validation confirmed good agreement with numerical predictions. However, deviations in strand thickness at sharp corners suggest that capillary-driven melt redistribution may play a role, which cannot be captured without resorting to more computationally intensive particle-level models. This work demonstrates the potential of continuum-based modelling for predicting sintering behaviour in SLS while maintaining computational efficiency. The model offers a valuable tool for exploring process parameters and optimising print path strategies, ultimately contributing to industrialisation of polymer SLS.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104828"},"PeriodicalIF":10.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nano/micro-structured polymer-derived SiBCN ceramics via two-photon lithography 基于双光子光刻技术的纳米/微结构聚合物衍生的SiBCN陶瓷

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-13 DOI: 10.1016/j.addma.2025.104849

Yanpei Dang , Zhao Xu , Ka-Wai Yeung , Zhanchen Zhu , Jiaqi Sun , Suet To , Chak-Yin Tang , Yujie Song , Haihui Ruan

{"title":"Nano/micro-structured polymer-derived SiBCN ceramics via two-photon lithography","authors":"Yanpei Dang , Zhao Xu , Ka-Wai Yeung , Zhanchen Zhu , Jiaqi Sun , Suet To , Chak-Yin Tang , Yujie Song , Haihui Ruan","doi":"10.1016/j.addma.2025.104849","DOIUrl":"10.1016/j.addma.2025.104849","url":null,"abstract":"<div><div>Printed microstructures face challenges when their applications require excellent mechanical strength and chemical stability at high temperatures. To maximize the service temperatures of printed microstructures, this study introduces a printable ceramic precursor for deriving SiBCN microstructures. The precursor possesses a high photosensitivity and high ceramic yield (76 wt%) because of the graft of acrylate and an increase of crosslinking degree, which is achieved by functionalizing polyborosilazane with 2-Isocyanatoethyl acrylate via nucleophilic addition reaction. The composition and chemical structure of the precursor and ceramic have been meticulously characterized. Moreover, a kinetics model has been established to describe the weight loss in pyrolysis, illuminating that the polymer-to-ceramic conversion is a diffusion-mediated growth process. Through two-photon lithography and pyrolysis, the photosensitive precursor can directly lead to SiBCN nano/microstructures with complex shapes and submicron (linewidth: ∼700 nm) features, which are the smallest SiBCN structures reported to date. At these microscales, it is revealed that shrinkage during pyrolysis is anisotropic and surface-area dependent and that the printed SiBCN micropillars can have an exceptional compressive strength of 3.59 ± 0.08 GPa. The potential applications of printed SiBCN microstructures were explored, including high-temperature embossing stamps for microlens and structural-color fabrication.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104849"},"PeriodicalIF":10.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical role of electrostatic forces in powder spreading in micro laser powder bed fusion 静电力在微激光粉末床熔合中粉末扩散中的关键作用

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-13 DOI: 10.1016/j.addma.2025.104848

Zongxin Hu , Hui Chen , Zeshi Yang , Wentao Yan

{"title":"Critical role of electrostatic forces in powder spreading in micro laser powder bed fusion","authors":"Zongxin Hu , Hui Chen , Zeshi Yang , Wentao Yan","doi":"10.1016/j.addma.2025.104848","DOIUrl":"10.1016/j.addma.2025.104848","url":null,"abstract":"<div><div>Micro laser powder bed fusion (micro-LPBF) is a highly precise additive manufacturing technique typically utilizing fine powder particles smaller than 20 <span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span>. However, the small size of powder particles in micro-LPBF results in serious agglomeration, leading to poor quality of the powder layer, characterized by reduced packing density and worsened surface roughness. This is crucial as the powder layer quality directly impacts the quality of as-printed parts. In this study, we leverage experimental and numerical approaches to investigate the powder spreading mechanisms in micro-LPBF. Both rubber and metal scrapers are used in the experiments, and the rubber scraper achieves a denser powder layer with the relative packing density of ∼ 40 %, outperforming the metal scraper (∼ 30 %). Both simulation and experiments confirm the existence and critical role of the electrostatic force originating from friction, which is the first report to the best of our knowledge. Compared to the metal scraper, the rubber scraper with a larger work function and a higher surface energy density produces stronger electrostatic forces between powder particles. Consequently, the attractive effects of van der Waals forces are counteracted by the repulsive electrostatic forces, alleviating the powder agglomeration and thus resulting in a denser powder layer. On the other hand, it is also found that more powder particles adhere to the bottom of the rubber scraper, leading to a less optimal powder layer, especially when the layer thickness is very small. This study has provided new scientific understanding and can offer practical guidance on selecting scrapers according to the powder materials to achieve high-quality powder layer by adjusting the electrostatic forces between powder particles.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104848"},"PeriodicalIF":10.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fine-grained binder jetted tungsten heavy alloys with in situ nano-La2O3 addition via a novel metal salt binder 通过一种新型的金属盐粘结剂，在原位添加纳米la2o3的情况下喷射出细晶粒的重钨合金

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-10 DOI: 10.1016/j.addma.2025.104843

Yuhua Heng, Yiwei Mao, Kunhao Feng, Jiangtao Sun, Jianan Zheng, Yingmi Xie, Qingsong Wei

{"title":"Fine-grained binder jetted tungsten heavy alloys with in situ nano-La2O3 addition via a novel metal salt binder","authors":"Yuhua Heng, Yiwei Mao, Kunhao Feng, Jiangtao Sun, Jianan Zheng, Yingmi Xie, Qingsong Wei","doi":"10.1016/j.addma.2025.104843","DOIUrl":"10.1016/j.addma.2025.104843","url":null,"abstract":"<div><div>Binder jetting (BJ) holds immense potential for manufacturing complex tungsten heavy alloy (WHA) parts with high efficiency and low cost. However, sintered BJ WHA parts often face the challenges of coarse grains and poor mechanical performance, which can be attributed to low green density and stringent sintering conditions (e.g., high temperature or long duration). In WHA powder metallurgy, oxide nanoparticles are often introduced to pin grain boundaries, limiting grain growth during the sintering process and thereby enhancing the mechanical properties. This work introduced oxide nanoparticles through the binder, which could effectively avoid the problems of uneven mixing, process complexity and impurity introduction. La(NO<sub>3</sub>)<sub>3</sub> binder, the key component of which was La(NO<sub>3</sub>)<sub>3</sub>, a water-soluble inorganic metal salt, would generate nano-La<sub>2</sub>O<sub>3</sub> (200 nm) in situ among the base powders during pretreatment, aiming at refining W grains and enhancing mechanical performance. The effects of La(NO<sub>3</sub>)<sub>3</sub> binder on the microstructure and properties of sintered BJ WHAs were systematically investigated and compared with those printed by the commercial binder. The average W grain size of sintered samples was 26.85 μm, finer than that printed by the commercial binder (34.53 μm). The ultimate tensile strength and yield strength of sintered samples were 926.54 MPa and 661.72 MPa, which were 8.46 % and 5.86 % higher than those printed by the commercial binder, respectively. Furthermore, the contributions of fine-grained strengthening, dispersion strengthening, solid-solution strengthening, and dislocation strengthening to the yield strength of sintered WHAs printed by La(NO<sub>3</sub>)<sub>3</sub> binder were all enhanced. This work offers a promising approach for grain refinement and performance enhancement of BJ metallic materials.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104843"},"PeriodicalIF":10.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced geometric accuracy in directed energy deposition via closed-loop melt pool height control using real-time thermal imaging 通过实时热成像闭环熔池高度控制，提高了定向能沉积的几何精度

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-10 DOI: 10.1016/j.addma.2025.104846

Subin Shin , Ikgeun Jeon , Hoon Sohn

{"title":"Enhanced geometric accuracy in directed energy deposition via closed-loop melt pool height control using real-time thermal imaging","authors":"Subin Shin , Ikgeun Jeon , Hoon Sohn","doi":"10.1016/j.addma.2025.104846","DOIUrl":"10.1016/j.addma.2025.104846","url":null,"abstract":"<div><div>This study presents a closed-loop melt pool height control system based on real-time thermal imaging to enhance the geometric accuracy of directed energy deposition (DED). Geometric inaccuracies in DED-printed components arise from the inherent thermal and geometric variations during the printing process. To improve geometric conformity with a predefined digital model, the proposed system employs a long-wave infrared camera to capture real-time thermal images of the melt pool. The peak-to-boundary temperature difference (TD), defined as the difference between the peak and boundary temperatures of the melt pool, is extracted from these images. The correlation between TD, melt pool height, and laser power was analyzed under various DED conditions, and the results demonstrated a strong relationship between TD and both parameters. Using the TD as a feedback parameter, the laser power is dynamically adjusted to maintain a stable melt pool height throughout the printing process. The proposed system enables real-time estimation of the melt pool height, ensures height stability through closed-loop control, and provides detailed insights into the thermal and geometric variations that affect the accuracy of the final part. This approach reduces the geometric error relative to the predefined digital model to below 4 %, highlighting its effectiveness in enhancing the geometric accuracy in complex multi-bead, multi-layer structures.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104846"},"PeriodicalIF":10.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of oxygen inhibition on (meth)acrylate photopolymerization in tomographic volumetric printing 氧抑制对层析体积印刷（甲基）丙烯酸酯光聚合的影响

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-09 DOI: 10.1016/j.addma.2025.104844

Yujie Zhang , Hendrick de Haan , Katherine Houlahan , Kathleen L. Sampson , Daniel Webber , Antony Orth , Thomas Lacelle , Liliana Gaburici , Rene Lam , Bhavana Deore , Chantal Paquet

{"title":"Impact of oxygen inhibition on (meth)acrylate photopolymerization in tomographic volumetric printing","authors":"Yujie Zhang , Hendrick de Haan , Katherine Houlahan , Kathleen L. Sampson , Daniel Webber , Antony Orth , Thomas Lacelle , Liliana Gaburici , Rene Lam , Bhavana Deore , Chantal Paquet","doi":"10.1016/j.addma.2025.104844","DOIUrl":"10.1016/j.addma.2025.104844","url":null,"abstract":"<div><div>Oxygen inhibition in (meth)acrylate photopolymerization gives rise to a gelation threshold by delaying polymerization until the accumulated light dose exceeds a critical value, thereby enabling 3D printing with tomographic volumetric additive manufacturing (TVAM). While this thresholding behavior is essential to TVAM, its underlying kinetics have not been thoroughly studied. In this work, we systematically examine how photoinitiator (PI) concentration and light intensity govern the time required to deplete oxygen in (meth)acrylate photoresins, and evaluate their impact on print quality. To investigate these effects, we derive theoretical results elucidating oxygen inhibition, which remain valid even at low PI concentrations typical in TVAM printing, and can be used to estimate the oxygen concentration in the photoresins. We compare these predictions with photo-rheology experiments and observe good agreement. The findings reveal that at low PI concentrations, decreasing PI concentration dramatically increases oxygen depletion times, thereby extending oxygen diffusion periods and leading to poor printing quality; a similar trend is observed with reduced light intensity. While higher PI concentrations and increased light intensity can improve print quality, they are constrained by penetration depth limits and illumination restrictions of LED-based projection sources. This study also highlights the challenges of printing larger parts in TVAM, where oxygen inhibition and limited light penetration narrow the usable PI concentration range. These insights help optimize TVAM parameters to improve print quality and expand the technology's capabilities.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104844"},"PeriodicalIF":10.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic physics–data-driven cross-scale optimization of dielectric properties in multimaterial inkjet printing 协同物理-数据驱动的多材料喷墨打印介质性能跨尺度优化

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-09 DOI: 10.1016/j.addma.2025.104845

Zhenghua Liu, Jin Huang, Yuji Li, Jiaying Zhang, Bu Ping, Junhao Li, Wenzhuo Liu, Delong Shi, Fanbo Meng

{"title":"Synergistic physics–data-driven cross-scale optimization of dielectric properties in multimaterial inkjet printing","authors":"Zhenghua Liu, Jin Huang, Yuji Li, Jiaying Zhang, Bu Ping, Junhao Li, Wenzhuo Liu, Delong Shi, Fanbo Meng","doi":"10.1016/j.addma.2025.104845","DOIUrl":"10.1016/j.addma.2025.104845","url":null,"abstract":"<div><div>In multimaterial inkjet printing process, variations in material properties, device dimensions, and cumulative energy effects during manufacturing significantly impact the stability of the electrical properties of printed electronics. Particularly, microscale polymerization and degradation reactions of monomers severely affect the macroscopic dielectric properties. To simultaneously ensure conductive material sintering and optimize the dielectric performance, we developed an innovative physics- and data-driven intelligent optimization approach. By combining theoretical kinetic modeling, to simulate microscale polymerization and degradation reactions, with advanced machine learning algorithms, this method accurately predicts frequency-dependent macroscale dielectric properties and enables inverse process parameter optimization. The experimental results show exceptional agreement between the predicted and measured dielectric properties, with coefficients of determination of 0.9938 and 0.9812 for the real and imaginary parts, respectively. By precise inverse tuning of the process parameters, dielectric constants were stabilized at 2.7 in the high-frequency band (8.2 GHz–12.4 GHz) and at 3.5 in the low-frequency band (20 Hz–100 kHz). Furthermore, multilayer flexible circuits and microstrip antennas fabricated using this optimized strategy exhibit excellent dielectric stability and show the effectiveness of this cross-scale optimization method for guiding integrated high-performance manufacturing of multimaterial electronic devices.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104845"},"PeriodicalIF":10.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complex architecture fabrication with photosensitive PEEK-based ink via vat photopolymerization and two-step thermal treatment 通过还原光聚合和两步热处理，用光敏peek基油墨制造复杂结构

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-06 DOI: 10.1016/j.addma.2025.104840

Ze Zhang , Kewei Song , Rongyi Zhuang , HE Jianxian , Yi Yang , Yifan Pan , Takeshi Mino , Kayo Hirose , Shinjiro Umezu

{"title":"Complex architecture fabrication with photosensitive PEEK-based ink via vat photopolymerization and two-step thermal treatment","authors":"Ze Zhang , Kewei Song , Rongyi Zhuang , HE Jianxian , Yi Yang , Yifan Pan , Takeshi Mino , Kayo Hirose , Shinjiro Umezu","doi":"10.1016/j.addma.2025.104840","DOIUrl":"10.1016/j.addma.2025.104840","url":null,"abstract":"<div><div>As a semi-crystalline high-performance engineering plastic, Polyetheretherketone (PEEK) has demonstrated significant potential since its inception. However, the ability to fabricate complex structures with PEEK has been constrained by the inherent limitations of extrusion-based 3D printing technologies, such as low resolution, poor surface quality, and insufficient interlayer bonding. We propose a novel photosensitive PEEK-based ink processing method using vat photopolymerization, which leverages high solid-content PEEK ink to achieve high-precision green body fabrication, followed by two-step thermal treatment to enhance the overall performance of the PEEK ink. This study optimizes process parameters focusing on moldability, printing accuracy, material thermal properties, and PEEK crystallinity. Additionally, the material and structural performance were comprehensively evaluated in terms of thermal performance, mechanical strength, and corrosion resistance. This method represents an innovative expansion of PEEK-based composite material processing, allowing the exceptional properties of PEEK to be utilized in more flexible and efficient application scenarios.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"108 ","pages":"Article 104840"},"PeriodicalIF":10.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144231213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of build process on microstructural evolution in laser directed energy deposition of Ti-8.5Cu Alloy: An in situ synchrotron X-ray imaging and post-build electron microscopy study 构建过程对激光定向能沉积Ti-8.5Cu合金显微组织演变的影响：原位同步加速器x射线成像和构建后电镜研究

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-06 DOI: 10.1016/j.addma.2025.104841

Jayshri Dumbre , Zherui Tong , Yunhui Chen , Alexander Rack , Nathalie Isac , Manas V. Upadhyay , Mark Easton , Dong Qiu

{"title":"Impact of build process on microstructural evolution in laser directed energy deposition of Ti-8.5Cu Alloy: An in situ synchrotron X-ray imaging and post-build electron microscopy study","authors":"Jayshri Dumbre , Zherui Tong , Yunhui Chen , Alexander Rack , Nathalie Isac , Manas V. Upadhyay , Mark Easton , Dong Qiu","doi":"10.1016/j.addma.2025.104841","DOIUrl":"10.1016/j.addma.2025.104841","url":null,"abstract":"<div><div>Understanding the microstructural formation and evolution in a dynamic temperature field during the metal additive manufacturing process has been a significant challenge, particularly in alloy systems containing solute(s) with high diffusivity at temperatures where solid-solid phase transformations take place, such as the eutectoid decomposition in Ti-Cu alloys. This study explores the influence of the build process on the microstructural evolution in Ti-8.5Cu alloy processed using Directed Energy Deposition – Laser Beam/Metals (DED-LB/M). Utilising <em>in situ</em> synchrotron X-ray radiography, changes in melt pool geometry for each layer during the DED-LB/M process are analysed. The results reveal a substantial increase in the length, depth and volume of the melt pool from the bottom to the top layers and with the increase of laser power. Such changes reflect the rise in residual temperature, and these data are used to calibrate the classical Rosenthal model, enabling it to accurately describe the temperature profile across the entire build. Post-build electron microscopy studies reveal that the volume fraction of pearlite exhibits an unusual ‘V-shaped’ dependence on laser power. This dependence is well explained by the competition between the nucleation rate and the growth rate of pearlite. This finding offers valuable insight into microstructure manipulation of Ti-8.5Cu alloy during DED-LB/M processing. It also serves as an excellent example of how <em>in situ</em> synchrotron X-ray imaging can be fully utilized to understand microstructure evolution in a complex and challenging manufacturing process.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104841"},"PeriodicalIF":10.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144308129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving the strength-ductility balance through the control of the prior β-grain size in laser beam powder bed fusion of Ti-6Al-4V 通过控制Ti-6Al-4V激光粉末床熔接过程中β晶粒的优先尺寸，达到强度-塑性平衡

IF 10.3 1区工程技术

Additive manufacturing Pub Date : 2025-06-06 DOI: 10.1016/j.addma.2025.104842

Dina M. Fouad , Chinnapat Panwisawas , Honghao Ge , Yu-Lung Chiu , Moataz M. Attallah

{"title":"Achieving the strength-ductility balance through the control of the prior β-grain size in laser beam powder bed fusion of Ti-6Al-4V","authors":"Dina M. Fouad , Chinnapat Panwisawas , Honghao Ge , Yu-Lung Chiu , Moataz M. Attallah","doi":"10.1016/j.addma.2025.104842","DOIUrl":"10.1016/j.addma.2025.104842","url":null,"abstract":"<div><div>Limited work exists on the potential for microstructural control during Laser Beam Powder Bed Fusion (LB-PBF) in α+ β Ti-alloys, particularly the impact of the process parameters on the prior-β grain size and its subsequent influence on the strength-ductility balance. Through controlling the solidification conditions, this work explores the role of the heat input parameters and laser scanning strategies in controlling the prior-β grain size and consequently the mechanical performance in LB-PBF-processed Ti-6Al-4V. Electron backscattered diffraction (EBSD) was used in combination with β-phase reconstruction to elucidate the effect of the heat input and scanning strategies on the microstructure, combined with coupled thermal microstructural modelling. The study highlights the possibility for controlling the prior-β grain size through manipulating the solidification conditions, ultimately resulting in enhanced ductility in refined structures. Moreover, whilst the majority of LB-PBF literature relies on the energy density concept to express the heat input, its significance when it comes to the microstructural characteristics was found to be minimal. Conditions with similar energy densities yielded different prior-β grain sizes, and to a lesser extent variations in the α′/α-lath size following a 650˚C/2hrs stress-relief treatment. Similarly, the use of large island scanning strategies resulted in finer prior-β grain sizes, and ultimately higher ductility following stress-relief treatment. The study highlights the possibility for controlling the microstructure in LB-PBF of Ti-alloys, both to improve the mechanical performance and design tailored microstructures.</div></div>","PeriodicalId":7172,"journal":{"name":"Additive manufacturing","volume":"109 ","pages":"Article 104842"},"PeriodicalIF":10.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0