Additive manufacturing letters最新文献_第10页

Reference dataset and benchmark for reconstructing laser parameters from on-axis video in powder bed fusion of bulk stainless steel 大块不锈钢粉末床聚变中基于轴上视频重建激光参数的参考数据集和基准

Additive manufacturing letters Pub Date : 2023-07-07 DOI: 10.1016/j.addlet.2023.100161

Cyril Blanc, Ayyoub Ahar, Kurt De Grave

引用次数: 0

Bend-Forming: A CNC deformation process for fabricating 3D wireframe structures 弯曲成形:制造三维线框结构的数控变形工艺

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100146

Harsh G. Bhundiya, Zachary C. Cordero

{"title":"Bend-Forming: A CNC deformation process for fabricating 3D wireframe structures","authors":"Harsh G. Bhundiya, Zachary C. Cordero","doi":"10.1016/j.addlet.2023.100146","DOIUrl":"10.1016/j.addlet.2023.100146","url":null,"abstract":"<div><p>This paper presents a computer numerical control (CNC) deformation process, termed Bend-Forming, for fabricating 3D wireframe structures. The process relies on the combination of CNC wire bending with mechanical joints to construct reticulated structures from wire feedstock. A key component of the process is a path planning framework which uses Euler paths and geometrical computations to derive fabrication instructions for arbitrary 3D wireframe geometries. We demonstrate the process by fabricating exemplary structures on the order of 1 m, including reticulated columns, shells, and trusses, with rapid build times compared to other additive manufacturing techniques. The structures fabricated herein contain defects which result in residual stress and imperfect geometries. To determine the tolerances needed to fabricate accurate structures, we develop a model of error stack-up for Bend-Forming, using fabrication defects in feed length, bend and rotate angle, and strut curvature. We find that for tetrahedral trusses fabricated with Bend-Forming, defects in feed length and strut curvature have a large effect on the surface precision and stiffness of the truss, respectively, and are thus important tolerances to control to achieve structural performance metrics. Overall, Bend-Forming is a versatile and low-power process that is well suited for a wide-range of applications, from rapid prototyping of wireframe structures to in-space manufacturing.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"6 ","pages":"Article 100146"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45749075","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

Effects of deposition sequence on microstructural evolution in additively manufactured Cu-Cr-Nb alloy / superalloy bimetallic structures 沉积顺序对添加Cu-Cr-Nb合金/高温合金双金属结构显微组织演变的影响

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100151

A.D. Iams , T.J. Lienert , D.A. Otazu , M. Ramoni

引用次数: 0

Microstructure of an additively manufactured Ti-Ta-Al alloy using novel pre-alloyed powder feedstock material 采用新型预合金粉料增材制备Ti-Ta-Al合金的显微组织

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100144

C. Lauhoff , T. Arold , A. Bolender , M.W. Rackel , F. Pyczak , M. Weinmann , W. Xu , A. Molotnikov , T. Niendorf

{"title":"Microstructure of an additively manufactured Ti-Ta-Al alloy using novel pre-alloyed powder feedstock material","authors":"C. Lauhoff , T. Arold , A. Bolender , M.W. Rackel , F. Pyczak , M. Weinmann , W. Xu , A. Molotnikov , T. Niendorf","doi":"10.1016/j.addlet.2023.100144","DOIUrl":"10.1016/j.addlet.2023.100144","url":null,"abstract":"<div><p>Binary Ti-Ta and ternary Ti-Ta-Al alloys attracted considerable attention as new potential biomaterials and/or high-temperature shape memory alloys. However, conventional forming and manufacturing technologies of refractory based titanium alloys are difficult and cost-intensive, especially when complex shapes are required. Recently, additive manufacturing (AM) emerged as a suitable alternative and several studies exploited elemental powder mixing approaches to obtain a desired alloy and subsequently use it for complex shape manufacture. However, this approach has one major limitation associated with material inhomogeneities after fabrication. In present work, novel pre-alloyed powder material of a Ti-Ta-Al alloy was additively manufactured. Hereto, electron beam powder bed fusion (PBF-EB/M) technique was used for the first time to process such Ti-Ta based alloy system. Detailed microstructural analysis revealed that additively manufactured structures had a near full density and high chemical homogeneity. Thus, AM of pre-alloyed feedstock material offers great potential to overcome major roadblocks, even when significant differences in the melting points and densities of the constituents are present as proven in the present case study. The homogeneous microstructure allows to apply short-term thermal post treatments. The highly efficient process chain detailed will open up novel application fields for Ti-Ta based alloys.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"6 ","pages":"Article 100144"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43639614","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: 2

Synchrotron imaging derived relationship between process parameters and build quality for directed energy deposition additively manufactured IN718 同步加速器成像推导了定向能沉积增材制造IN718工艺参数与制造质量的关系

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100137

S.V. Notley , Y. Chen , N.A. Thacker , P.D. Lee , G. Panoutsos

{"title":"Synchrotron imaging derived relationship between process parameters and build quality for directed energy deposition additively manufactured IN718","authors":"S.V. Notley , Y. Chen , N.A. Thacker , P.D. Lee , G. Panoutsos","doi":"10.1016/j.addlet.2023.100137","DOIUrl":"10.1016/j.addlet.2023.100137","url":null,"abstract":"<div><p>Laser additive manufacturing is transforming several industrial sectors, especially the directed energy deposition process. A key challenge in the widespread uptake of this emerging technology is the formation of undesirable microstructural features such as pores, cracks, and large epitaxial grains. The trial and error approach to establish the relationship between process parameters and material properties is problematic due to the transient nature of the process and the number of parameters involved. In this work, the relationship between process parameters, melt pool geometry and quality of build measures, using directed energy deposition additive manufacturing for IN718, is quantified using neural networks as generalised regressors in a statistically robust manner. The data was acquired using <em>in-situ</em> synchrotron x-ray imaging providing unique and accurate measurements for our analysis. An analysis of the variations across repeated measurements show heteroscedastic error characteristics that are accounted for using a principled nonlinear data transformation method. The results of the analysis show that surface roughness correlates with melt pool geometry while the track height directly correlates with process parameters indicating a potential to directly control efficiency and layer thickness while independently minimising surface roughness.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"6 ","pages":"Article 100137"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47915536","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: 3

PLA-Mg composites by laser-based powder bed fusion – A preliminary study 激光粉末床熔融PLA-Mg复合材料的初步研究

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100148

Franziska Schmidt , Oliver Weishaupt , Mario Radwan , Michael Willeke , Sulamith Frerich

引用次数: 0

Exploring Alloy Design Pathway Through Directed Energy Deposition of Powder Mixtures: A Study of Stainless Steel 316L and Inconel 718 利用定向能沉积粉末混合物探索合金设计途径——以不锈钢316L和因科乃尔718为研究对象

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100133

Noah Sargent , Yuankang Wang , Daozheng Li, Yunhao Zhao, Xin Wang, Wei Xiong

{"title":"Exploring Alloy Design Pathway Through Directed Energy Deposition of Powder Mixtures: A Study of Stainless Steel 316L and Inconel 718","authors":"Noah Sargent , Yuankang Wang , Daozheng Li, Yunhao Zhao, Xin Wang, Wei Xiong","doi":"10.1016/j.addlet.2023.100133","DOIUrl":"10.1016/j.addlet.2023.100133","url":null,"abstract":"<div><p>Additive manufacturing (AM) is a tool for rapid prototyping with complex geometry. However, the cyclic heating and cooling in laser melting processes often cause large columnar grains that dominate the as-printed microstructure, resulting in a strong texture and anisotropic properties that limit the application of AM. In this work, we apply powder-based directed energy deposition to discover new alloys using mixtures of Inconel 718 (IN718) and Stainless Steel 316L (SS316L). We discovered that the 77 wt.% IN718 alloy mixture, with the highest configurational entropy, demonstrated an intriguingly fine grain structure in the as-built condition and after homogenization at 1180°C. Residual stress from the laser melting process was identified as the primary cause of the observed grain refinement phenomenon. Although, a quantitative analysis of the changes in grain size after homogenization in the alloy mixtures of IN718 and SS316L requires further research. The discovery of this unique microstructural behavior shows how in-situ mixing of commercially available powders can be used to develop next-generation feedstock materials for AM and improve the understanding of fundamental process-microstructure-property relationships.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"6 ","pages":"Article 100133"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46159634","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: 5

Simultaneous 3D tracking and temperature measurements of L-PBF spatter particles using a single camera L-PBF飞溅颗粒的三维同步跟踪和温度测量

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100134

Dustin Kelly , Ralf D. Fischer , Mahyar Moaven , Sarah Morris , Barton C. Prorok , Brian Thurow

{"title":"Simultaneous 3D tracking and temperature measurements of L-PBF spatter particles using a single camera","authors":"Dustin Kelly , Ralf D. Fischer , Mahyar Moaven , Sarah Morris , Barton C. Prorok , Brian Thurow","doi":"10.1016/j.addlet.2023.100134","DOIUrl":"10.1016/j.addlet.2023.100134","url":null,"abstract":"<div><p>This work discusses the implementation of a novel technique for simultaneous 3D particle tracking velocimetry and dual-wavelength pyrometry of spatter particles ejected during the Laser-Powder Bed Fusion (L-PBF) process using a single high-speed spectral plenoptic camera. In this methodology, particle tracking uses the Light-Field Ray Bundling algorithm paired with a four-frame best estimate track initiation with 3D Kalman filter for tracking to generate high-resolution, time-resolved 3D tracks of spatter particles. Utilizing the same light-field image data, spatter particle temperature is measured using dual-wavelength pyrometry that calculates temperature from the ratio of two narrow-band wavelength intensities. Preliminary results demonstrate the viability and potential of this technique for the L-PBF processes on the example of a turnaround laser scan. The temperature measurements indicate that the detected particles are in the liquid phase, with temperatures greater than 1950 <span><math><mtext>°</mtext></math></span>C. The simultaneous measurements demonstrate an overall deceleration and cooling of particles during their flight.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"6 ","pages":"Article 100134"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46369766","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

Effect of solidification pathway during additive manufacturing on grain boundary fractality 增材制造过程中凝固路径对晶界分形的影响

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100149

Akane Wakai , Amlan Das , Jenniffer Bustillos , Atieh Moridi

引用次数: 2

Inconel 718 two ways: Powder bed fusion vs. directed energy deposition Inconel 718两种方法:粉末床熔合与定向能沉积

Additive manufacturing letters Pub Date : 2023-07-01 DOI: 10.1016/j.addlet.2023.100145

Lova Chechik, Iain Todd

引用次数: 0