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Scanning laser epitaxy (SLE) is a laser powder bed fusion (LPBF)-based additive manufacturing process that uses a high-power laser to consolidate metal powders facilitating the fabrication of three-dimensional objects. In the present study, SLE is used to produce samples of IN100, a high-γ′ non-weldable nickel-base superalloy on similar chemistry substrates. A thorough analysis is performed using various advanced material characterization techniques such as high-resolution optical microscopy, scanning electron microscopy, energy dispersive x-ray spectroscopy, and Vickers microhardness measurements to characterize and compare the quality of the SLE-fabricated IN100 deposits with the investment cast IN100 substrates. The results show that the IN100 deposits have a finer γ/γ′ microstructure, weaker elemental segregation, and higher microhardness compared with the substrate. Through this study, it is demonstrated that the SLE process has tremendous potential in the repair and manufacture of gas turbine hot-section components. 相似文献
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Junrong Tang Naeem ul Haq Tariq Zhipo Zhao Mingxiao Guo Hanhui Liu Yupeng Ren Xinyu Cui Yanfang Shen Jiqiang Wang Tianying Xiong 《金属学报(英文版)》2022,35(9):1465
In this study, an innovative approach was used to fabricate Ti-Ta composite biomaterials through cold spray additive manufacturing followed by a diffusion treatment. The microstructure and mechanical properties of the composites were investigated in detail using field emission scanning electron microscopy, electron backscatter diffraction, 3D X-ray computed tomography, tensile test, nanohardness test and resonance vibration test. The obtained results indicated that the prepared composites have inhomogeneity in their microstructure and composition. A unique microstructure, composed of Ti-rich, Ta-rich and diffusion regions, was evolved in the composites due to incomplete diffusion between Ti and Ta splats. Further, Kirkendall pores were formed in the composites due to uneven diffusion of the two phases (of Ti and Ta) during high-temperature heat treatment. The prepared composites simultaneously showed low elastic modulus and high tensile strength which is required for a good biomaterial. Low elastic modulus was associated with the residual pores and the alloying effect of Ta in Ti, while high tensile strength was related to the solid solution strengthening effects. The obtained results indicated that the prepared Ti-Ta composites have a great potential to become a new candidate for biomedical applications. 相似文献
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西马克集团增材制造研发中心,将增材制造产业的整个价值链作为研究方向,其研发制造的雾化粉末设备,可以生产高品质的金属粉末,具有成本低、效率高的优势。该设备集成了卫星粉防控技术,极大地降低了不合格粉末颗粒的含量,同时,通过对雾化过程进行CFD计算流体动力学仿真(以下简称CFD仿真),优化了紧耦合喷嘴的设计,提高了金属粉末的性能和收得率。 相似文献
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Metal Additive Manufacturing: A Review 总被引:1,自引:0,他引:1
William E. Frazier 《Journal of Materials Engineering and Performance》2014,23(6):1917-1928
This paper reviews the state-of-the-art of an important, rapidly emerging, manufacturing technology that is alternatively called additive manufacturing (AM), direct digital manufacturing, free form fabrication, or 3D printing, etc. A broad contextual overview of metallic AM is provided. AM has the potential to revolutionize the global parts manufacturing and logistics landscape. It enables distributed manufacturing and the productions of parts-on-demand while offering the potential to reduce cost, energy consumption, and carbon footprint. This paper explores the material science, processes, and business consideration associated with achieving these performance gains. It is concluded that a paradigm shift is required in order to fully exploit AM potential. 相似文献
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Jonathan E. Spowart Nikhil Gupta Dirk Lehmhus 《JOM Journal of the Minerals, Metals and Materials Society》2018,70(3):272-274
Advanced composite materials form an important class of high-performance industrial materials used in weight-sensitive applications such as aerospace structures, automotive structures and sports equipment. In many of these applications, parts are made in small production runs, are highly customized and involve long process development times. Developments in additive manufacturing (AM) methods have helped in overcoming many of these limitations. The special topic of Additive Manufacturing of Composites and Complex Materials captures the state of the art in this area by collecting nine papers that present much novel advancement in this field. The studies under this topic show advancement in the area of AM of carbon fiber and graphene-reinforced composites with high thermal and electrical conductivities, development of new hollow glass particle-filled syntactic foam filaments for printing lightweight structures and integration of sensors or actuators during AM of metallic parts. Some of the studies are focused on process optimization or modification to increase the manufacturing speed or tuning manufacturing techniques to enable AM of new materials. 相似文献
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Iwona Jasiuk Diab W. Abueidda Christopher Kozuch Siyuan Pang Frances Y. Su Joanna McKittrick 《JOM Journal of the Minerals, Metals and Materials Society》2018,70(3):275-283
We present an overview on additive manufacturing (AM), also called three-dimensional printing, with a focus on polymers. First, we introduce the AM concept. Next, we outline several AM processes, including their advantages and limitations, and list common polymers that are used in commercial printers. Then, we state various AM applications and present two examples. We conclude with a global view of the AM field, its challenges, and future directions. 相似文献
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M. M. Kirka Y. Lee D. A. Greeley A. Okello M. J. Goin M. T. Pearce R. R. Dehoff 《JOM Journal of the Minerals, Metals and Materials Society》2017,69(3):523-531
Additive manufacturing (AM) technologies have long been recognized for their ability to fabricate complex geometric components directly from models conceptualized through computers, allowing for complicated designs and assemblies to be fabricated at lower costs, with shorter time to market, and improved function. Lacking behind the design complexity aspect is the ability to fully exploit AM processes for control over texture within AM components. Currently, standard heat-fill strategies utilized in AM processes result in largely columnar grain structures. Proposed in this work is a point heat source fill for the electron beam melting (EBM) process through which the texture in AM materials can be controlled. Through this point heat source strategy, the ability to form either columnar or equiaxed grain structures upon solidification through changes in the process parameters associated with the point heat source fill is demonstrated for the nickel-base superalloy, Inconel 718. Mechanically, the material is demonstrated to exhibit either anisotropic properties for the columnar-grained material fabricated through using the standard raster scan of the EBM process or isotropic properties for the equiaxed material fabricated using the point heat source fill. 相似文献
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Yuwei Zhai Diana A. Lados Jane L. LaGoy 《JOM Journal of the Minerals, Metals and Materials Society》2014,66(5):808-816
Additive manufacturing (AM) refers to an advanced technology used for the fabrication of three-dimensional near-net-shaped functional components directly from computer models, using unit materials. The fundamentals and working principle of AM offer several advantages, including near-net-shape capabilities, superior design and geometrical flexibility, innovative multi-material fabrication, reduced tooling and fixturing, shorter cycle time for design and manufacturing, instant local production at a global scale, and material, energy, and cost efficiency. Well suiting the requests of modern manufacturing climate, AM is viewed as the new industrial revolution, making its way into a continuously increasing number of industries, such as aerospace, defense, automotive, medical, architecture, art, jewelry, and food. This overview was created to relate the historical evolution of the AM technology to its state-of-the-art developments and emerging applications. Generic thoughts on the microstructural characteristics, properties, and performance of AM-fabricated materials will also be discussed, primarily related to metallic materials. This write-up will introduce the general reader to specifics of the AM field vis-à-vis advantages and common techniques, materials and properties, current applications, and future opportunities. 相似文献
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Adam Hehr Justin Wenning Kurt Terrani Sudarsanam Suresh Babu Mark Norfolk 《JOM Journal of the Minerals, Metals and Materials Society》2017,69(3):485-490
Ultrasonic additive manufacturing (UAM) is a three-dimensional metal printing technology which uses high-frequency vibrations to scrub and weld together both similar and dissimilar metal foils. There is no melting in the process and no special atmosphere requirements are needed. Consequently, dissimilar metals can be joined with little to no intermetallic compound formation, and large components can be manufactured. These attributes have the potential to transform manufacturing of nuclear reactor core components such as control elements for the High Flux Isotope Reactor at Oak Ridge National Laboratory. These components are hybrid structures consisting of an outer cladding layer in contact with the coolant with neutron-absorbing materials inside, such as neutron poisons for reactor control purposes. UAM systems are built into a computer numerical control (CNC) framework to utilize intermittent subtractive processes. These subtractive processes are used to introduce internal features as the component is being built and for net shaping. The CNC framework is also used for controlling the motion of the welding operation. It is demonstrated here that curved components with embedded features can be produced using a five-axis code for the welder for the first time. 相似文献