Additive manufacturing letters最新文献_第8页

Local composition control using an active-mixing hotend in fused filament fabrication 在熔丝制造中使用主动混合加热器的局部成分控制

Additive manufacturing letters Pub Date : 2023-10-13 DOI: 10.1016/j.addlet.2023.100177

Joshua T. Green , Ian A. Rybak , Jonathan J. Slager , Mauricio Lopez , Zachary Chanoi , Calvin M. Stewart , Roger V. Gonzalez

{"title":"Local composition control using an active-mixing hotend in fused filament fabrication","authors":"Joshua T. Green , Ian A. Rybak , Jonathan J. Slager , Mauricio Lopez , Zachary Chanoi , Calvin M. Stewart , Roger V. Gonzalez","doi":"10.1016/j.addlet.2023.100177","DOIUrl":"https://doi.org/10.1016/j.addlet.2023.100177","url":null,"abstract":"<div><p>Additive manufacturing with local composition control is uniquely suited for the development and exploration of advanced materials with compositionally graded structures. A fused filament fabrication printer was designed with in situ composition control facilitated by using an active-mixing hotend. Stepper motors drive three filament extruders and a mixing rod in proportions instructed by a print file to control composition and material distribution within extrusions. Composition tailoring was demonstrated by printing specimens with twelve distinct regions each consisting of unique filament mixtures. Local control of composition was demonstrated by printing a variety of specimens with composition gradients having horizontal, vertical, radial, and circumferential orientations. The tensile properties of printed materials were modified by printing with mix ratios of polylactic acid and thermoplastic polyurethane. Eight blend ratios were tested in tension and have tensile moduli ranging from 17.3 to 3480 MPa. These methods demonstrate advanced capabilities that are well suited for manufacturing functionally graded structures.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49751534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanical properties of stochastically cracked soft magnetic material 随机裂纹软磁材料的力学性能

Additive manufacturing letters Pub Date : 2023-10-13 DOI: 10.1016/j.addlet.2023.100179

Alexander D. Goodall , Jared Uramowski , Chad W Sinclair , Lova Chechik , Iain Todd

{"title":"Mechanical properties of stochastically cracked soft magnetic material","authors":"Alexander D. Goodall , Jared Uramowski , Chad W Sinclair , Lova Chechik , Iain Todd","doi":"10.1016/j.addlet.2023.100179","DOIUrl":"https://doi.org/10.1016/j.addlet.2023.100179","url":null,"abstract":"<div><p>Processing of soft magnetic materials with additive manufacturing has shown capability to deliver good magnetic properties and increased silicon content of Fe-6.5 wt%Si, however methods must be used to reduce the eddy currents in large bulk cross-sections in components created by additive manufacturing. Geometrical design has been shown to do this effectively, however stochastically cracked parts show similar magnetic performance with a large increase in stacking factor. To enable their use in electrical machines the mechanical properties of this material must be understood. Therefore, this study uses uniaxial tensile testing to understand the mechanical performance. The ultimate tensile strength of the material in the as-built condition was 17.9 MPa (σ = 4.5 MPa), which was improved by 40% to 25.5 MPa (σ = 5.7 MPa) by infiltrating the cracks with a low viscosity resin. This brings the material strength to more than three standard deviations from the required strength of 7 MPa to be used in a specific axial flux machine. The material exhibited an elongation to failure of 8-10%, showing that the suppression of ordered phases by high cooling rates has improved the ductility of the material. Hence, the stochastically cracked parts have sufficient properties to be used in the 3D magnetic circuits of electrical machines.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49751251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the development of twinning-induced plasticity in additively manufactured 316L stainless steel 增材制造316L不锈钢孪晶诱导塑性研究进展

Additive manufacturing letters Pub Date : 2023-10-11 DOI: 10.1016/j.addlet.2023.100176

D. Della Crociata, I. Maskery, R. Hague, M. Simonelli

引用次数: 0

Disorder-order transformation in Fe-50 %Co fabricated via laser powder bed fusion 激光粉末床熔合制备fe - 50% Co的无序-有序相变

Additive manufacturing letters Pub Date : 2023-09-27 DOI: 10.1016/j.addlet.2023.100174

Peeyush Nandwana , Chris M. Fancher , Rangasayee Kannan , Tomas F. Babuska , Brandon Krick , Andrew B. Kustas

引用次数: 0

Fatigue performance of U-notched additively manufactured AlSi10Mg parts: The effects of chemical and thermal post-treatments u形缺口增材制造AlSi10Mg零件的疲劳性能:化学和热后处理的影响

Additive manufacturing letters Pub Date : 2023-09-27 DOI: 10.1016/j.addlet.2023.100175

Erfan Maleki , Sara Bagherifard , Nabeel Ahmad , Shuai Shao , Okan Unal , Mario Guagliano , Nima Shamsaei

{"title":"Fatigue performance of U-notched additively manufactured AlSi10Mg parts: The effects of chemical and thermal post-treatments","authors":"Erfan Maleki , Sara Bagherifard , Nabeel Ahmad , Shuai Shao , Okan Unal , Mario Guagliano , Nima Shamsaei","doi":"10.1016/j.addlet.2023.100175","DOIUrl":"https://doi.org/10.1016/j.addlet.2023.100175","url":null,"abstract":"<div><p>In the current study, the effects of different post-processing methods, including heat treatment (HT) and electro-chemical polishing (ECP) as well as their combination on the surface texture, porosity, microstructure, mechanical properties, and rotating bending fatigue behavior of U-notched laser powder bed fused AlSi10Mg specimens were comprehensively investigated. In addition, to better understand the effects of the applied post-processing methods on the sensitivity of the notched specimen to surface and near-surface defects, finite element analysis was performed. Chemical treatment was found to be very influential on surface texture modification of the very narrow notched parts, for which the application of other treatments can be quite challenging. It was also found that the fatigue behavior of the notched specimens was more sensitive to the surface texture rather than to the near-surface defects. The hybrid treatment involving HT+ECP was the most effective for fatigue behavior improvement due to simultaneous homogenization of the microstructure, released tensile residual stresses, enhanced ductility and high surface texture modification.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49727294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cellular structure engineering of additive manufactured CoCrFeMnNi high-entropy composite: The role of hard ceramic reinforcements in elemental segregation of constitutive elements 增材制造CoCrFeMnNi高熵复合材料的胞状结构工程:硬质陶瓷增强剂在本构元素偏析中的作用

Additive manufacturing letters Pub Date : 2023-09-22 DOI: 10.1016/j.addlet.2023.100172

Soung Yeoul Ahn , Farahnaz Haftlang , Eun Seong Kim , Ji Sun Lee , Sang Guk Jeong , Jae Bok Seol , Hyunjoo Choi , Hyoung Seop Kim

{"title":"Cellular structure engineering of additive manufactured CoCrFeMnNi high-entropy composite: The role of hard ceramic reinforcements in elemental segregation of constitutive elements","authors":"Soung Yeoul Ahn , Farahnaz Haftlang , Eun Seong Kim , Ji Sun Lee , Sang Guk Jeong , Jae Bok Seol , Hyunjoo Choi , Hyoung Seop Kim","doi":"10.1016/j.addlet.2023.100172","DOIUrl":"https://doi.org/10.1016/j.addlet.2023.100172","url":null,"abstract":"<div><p>This study explores cellular structures in TiC/B<sub>4</sub>C<img>CoCrFeMnNi high-entropy composites (HECs) fabricated by direct energy deposition (DED) additive manufacturing process, investigating the role of TiC and B<sub>4</sub>C nano-paticles in enhancing mechanical properties. Despite larger dislocation cell structures and thinner boundaries in TiC/B<sub>4</sub>C<img>CoCrFeMnNi HECs compared to CoCrFeMnNi high-entropy alloy (HEA), they exhibit significantly higher hardness and strength, challenging traditional strength-size relationships. Additionally, we examine the behavior of ceramic nano-particles (TiC and B<sub>4</sub>C) with high melting points relative to matrix CoCrFeMnNi HEA. Rapid scanning prevents full nano-particle melting, leading to distinct element distribution of cell structure. These findings provide insights for selecting suitable nanoceramic particles in HEC development via metal additive manufacturing.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49751392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction and understanding of non-linear distortion on large curved wall manufactured by wire-arc direct energy deposition 线弧直接能量沉积大曲面壁非线性畸变的预测与认识

Additive manufacturing letters Pub Date : 2023-09-22 DOI: 10.1016/j.addlet.2023.100173

Yousub Lee , Andrzej Nycz , Srdjan Simunovic , Luke Meyer , Derek Vaughan , William Carter , Sudarsanam S. Babu , Joshua Vaughan , Lonnie Love

{"title":"Prediction and understanding of non-linear distortion on large curved wall manufactured by wire-arc direct energy deposition","authors":"Yousub Lee , Andrzej Nycz , Srdjan Simunovic , Luke Meyer , Derek Vaughan , William Carter , Sudarsanam S. Babu , Joshua Vaughan , Lonnie Love","doi":"10.1016/j.addlet.2023.100173","DOIUrl":"https://doi.org/10.1016/j.addlet.2023.100173","url":null,"abstract":"<div><p>Wire-arc direct energy deposition (wire-arc DED) has been developed to manufacture large-scale metal products with high deposition rates, low material cost, and high material efficiency. However, dynamically varying printing conditions and complex geometries frequently lead to unfavorable part distortions during and after printing which are magnified as part sizes increase. In this study, an effective computational simulation method was developed for large-scale 316 L stainless steel parts using finite element method. The model was validated with the measured distortion using a 3D laser scanner. The distribution of deviation is within 16 % (=1.6 mm) against a measured value for a 483.6 mm tall part with 248 layers, with excellent agreement with the spatial pattern of distortion. The dynamic part deformation during printing and cooling was tracked using vision camera to investigate the thermo-mechanical deformation mechanism. The result showed that long pauses during machine maintenance pauses have strong influence on part distortion.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49758992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Large Format Composite Additive Manufacturing for Low-Head Hydropower 用于低水头水电的大幅面复合增材制造

Additive manufacturing letters Pub Date : 2023-09-21 DOI: 10.1016/j.addlet.2023.100170

Alex Roschli , Brian Post , Randal Mueller , Vito Gervasi , Phillip Chesser , Jesse Heineman , Rebecca Brink

{"title":"Large Format Composite Additive Manufacturing for Low-Head Hydropower","authors":"Alex Roschli , Brian Post , Randal Mueller , Vito Gervasi , Phillip Chesser , Jesse Heineman , Rebecca Brink","doi":"10.1016/j.addlet.2023.100170","DOIUrl":"https://doi.org/10.1016/j.addlet.2023.100170","url":null,"abstract":"<div><p>Hydropower with a small elevation change from inlet to outlet, known as “low-head” hydropower, is a relatively untapped resource for reliable green power generation. One major barrier to entry is the cost of the components needed to generate the power. Each installation site is unique, with various head levels, flow rates, and other unique site characteristics that drive up the cost of development and installation. As a result, custom-made components are necessary because the sites are intrinsically inefficient. However, customized parts are generally more expensive to manufacture than ready-made parts. Often times, the cost of custom-made components is so high that the low-head hydropower installation becomes non-viable. Additive manufacturing offers the ability to make custom components, ideal for one-off applications, at low costs that are well suited for the needs of low-head hydropower. Indirect additive manufacturing, such as making tools or dies rather than end use components, can also be used to make low-cost composite tooling as needed for these custom applications. This paper explores the use of additive manufacturing, both directly and indirectly, to produce the components of a turbine system for a low-head hydropower site. The parts were designed to form a unique modular system, which saves time for future designs and iterations. The system has operated for more than three years without failure at a test site in Wisconsin, USA. This work serves as a basis for future application of AM to low-head systems, in which the modular components can be customized for each unique hydropower installation.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49727329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ tension investigation of additively manufactured silver lines on flexible substrates 柔性基板上增材制造银线的现场张力研究

Additive manufacturing letters Pub Date : 2023-09-20 DOI: 10.1016/j.addlet.2023.100171

Seungjong Lee , Zabihollah Ahmadi , Mikyle Paul , Masoud Mahjouri-Samani , Shuai Shao , Nima Shamsaei

{"title":"In-situ tension investigation of additively manufactured silver lines on flexible substrates","authors":"Seungjong Lee , Zabihollah Ahmadi , Mikyle Paul , Masoud Mahjouri-Samani , Shuai Shao , Nima Shamsaei","doi":"10.1016/j.addlet.2023.100171","DOIUrl":"https://doi.org/10.1016/j.addlet.2023.100171","url":null,"abstract":"<div><p>The reliability of additively manufactured flexible electronics or so-called printed electronics is defined as mean time to failure under service conditions, which often involve mechanical loads. It is thus important to understand the mechanical behavior of the printed materials under such conditions to ensure their applicational reliability in, for example, sensors, biomedical devices, battery and storage, and flexible hybrid electronics. In this article, a testing protocol to examine the print quality of additively nanomanufactured electronics is presented. The print quality is assessed by both tensile and electrical resistivity responses during in-situ tension tests. A laser based additive nanomanufacturing method is used to print conductive silver lines on polyimide substrates, which is then tested in-situ under tension inside a scanning electron microscope (SEM). The surface morphology of the printed lines is continuously monitored via the SEM until failure. In addition, the real-time electrical resistance variations of the printed silver lines are measured in-situ with a multimeter during tensile tests conducted outside of the SEM. The protocol is shown to be effective in assessing print quality and aiding process tuning. Finally, it is revealed that samples appearing identical under the SEM can have significant different tendencies to delaminate.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49765622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of interlayer temperature on melt-pool morphology in laser powder bed fusion 层间温度对激光粉末床熔池形貌的影响

Additive manufacturing letters Pub Date : 2023-08-22 DOI: 10.1016/j.addlet.2023.100169

Qian Wang , Panagiotis Michaleris Pan , Yong Ren , Corey Dickman , Edward Reutzel

{"title":"Effect of interlayer temperature on melt-pool morphology in laser powder bed fusion","authors":"Qian Wang , Panagiotis Michaleris Pan , Yong Ren , Corey Dickman , Edward Reutzel","doi":"10.1016/j.addlet.2023.100169","DOIUrl":"10.1016/j.addlet.2023.100169","url":null,"abstract":"<div><p>Considering the high correlation of melt-pool size and build quality of a part fabricated by a laser power bed fusion (L-PBF) process, it is important to understand what are the major thermal factors that affect melt-pool size during the build process. This paper conducts an experimental investigation on how interlayer temperature affects the melt-pool morphology through a case study of a square-canonical part of Inconel 718 built with the EOS M280 system. Interlayer temperature is the layer temperature after powder spreading but before scanning a new layer. This paper examines variations in melt-pool morphology across representative layers with a large difference in interlayer temperature. It also investigates how the melt-pool size variation is affected by local temperature change caused by switching the laser scanning direction from hatch-to-hatch within a single layer. It is observed that the melt-pool half-width has increased by 40% - 100% when the interlayer temperature has increased from 100°C to 300°C. On the other hand, the variation of melt-pool dimensions due to local temperature change is less significant under a low interlayer temperature at 100°C. The difference in melt-pool dimensions due to laser turnaround gets amplified when the interlayer temperature reaches high at 300°C. Moreover, a trend of melt-pool morphology transitioning from a conduction to a convective heat transfer mode is observed at the interlayer temperature of 300°C. Results of this paper demonstrate that interlayer temperature plays a critical role in thermal effects on melt-pool morphology, indicating a need of controlling interlayer temperature to improve build quality.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45196800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0