Article
Engineering, Manufacturing
Yaojie Wen, Baicheng Zhang, Ramasubramanian Lakshmi Narayan, Pei Wang, Xu Song, Hao Zhao, Upadrasta Ramamurty, Xuanhui Qu
Summary: A novel method for LPBF of large-scale compositionally graded alloy components was devised and demonstrated in this study, showing defect-free samples with smooth end-to-end variations in composition and microstructures. This method has the potential to be extended to other material combinations for creating high quality CGA components.
ADDITIVE MANUFACTURING
(2021)
Article
Automation & Control Systems
Qian Chen, Yao Fu, Albert C. To
Summary: In this study, a high-fidelity multiphysics model is developed to investigate the spattering and porosity formation mechanisms in laser powder bed fusion process. Two different porosity formation mechanisms are observed in experiments and simulations.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Hongbing Liu, Wenhao Cheng, Yiming Sun, Rui Ma, Yajun Wang, Jie Bai, Linan Xue, Xiaoguo Song, Caiwang Tan
Summary: A laser powder bed fusion (LPBF) Inconel 718 (IN718) alloy was fabricated under different process parameters, and the samples with optimal process parameters were treated by subsequent heat treatment. The size and shape of the pores in the samples were influenced by the process parameters. The porosity of the samples increased and then decreased as the volume energy density increased, and the types of pores changed. The heat treatment changed the microstructure of the samples and increased their strength.
Article
Nanoscience & Nanotechnology
Y. C. Wang, L. Y. Wang, B. Zhang, Z. M. Song, X. M. Luo, G. P. Zhang
Summary: This study investigates the building height-dependent creep properties and microstructures of laser powder bed fusion-fabricated Inconel 718 superalloy. The results reveal significant differences in recrystallization degree among specimens taken from different building heights due to variations in dislocation density and texture intensity along the building direction. The bottom specimen exhibits the highest recrystallization degree and longest creep life, attributed to lower dislocation density, higher Taylor factor, and lower grain boundary volume fraction.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
E. Aydogan, O. El-Atwani, B. Erdem, M. Li, A. Devaraj, B. Koc, W. -Y. Chen, A. Maloy
Summary: This study investigates the microstructure of a modified Inconel 718 alloy produced by laser powder bed fusion before and after in-situ Kr irradiation. It is observed that the microstructure changes, with different types and sizes of defects, after irradiation at different temperatures. The composition of both the matrix and second phase particles remains similar after irradiation. The superior radiation resistance of this alloy is attributed to the presence of fine cell boundaries stabilized by the second phase particles produced by additive manufacturing.
ADDITIVE MANUFACTURING
(2022)
Article
Automation & Control Systems
Akash Sali, Vivek Patel, James Hyder, David Hyder, Mike Corliss, Wayne Hung
Summary: This paper explores the feasibility of welding Inconel 718 (IN718) and compares the quality of electron beam welded samples produced by hot rolling and laser powder bed fusing (L-PBF). The results show that both the yield and tensile strength of the welded L-PBF materials exceeded those of rolled materials and met the minimum requirement from ASTM specification. However, the ductility of the welded L-PBF material did not.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Minglin He, Hailin Cao, Qian Liu, Jiang Yi, Yong Ni, Shuai Wang
Summary: In this study, the development of dislocation cellular pattern (DCP) in laser-based additively manufactured metals was systematically investigated using tensile tests and multiscale characterization methods. It was found that DCP differs from conventional dislocation cells as it is composed of solute atoms and small precipitates. The development of DCP was independent of crystal orientation and can be divided into two stages, with the DCP size being unaffected by stress at low strains and decreasing at higher strains with a maximum reduction of only ~27%. The dislocation density at DCP boundaries increased with increasing strain.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Sorush Khajepor, Omid Ejtehadi, Sina Haeri
Summary: The effects of interstitial gas on the spreadability of Inconel 718 powder in PBF-AM conditions were investigated using DEM-LB simulations. The presence of inert gases increased the amount of deposited powder and the bed thickness, and the disparity in powder deposition between gaseous and vacuum surroundings became more pronounced as the blade speed increased.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
P. Wood, A. Rusinek, P. Platek, J. Janiszewski, J. Sienkiewicz, U. F. Gunputh, K. Rajkowski, M. H. Miguelez
Summary: This paper investigates the effect of a randomly dispersed spherically voided microstructure on tensile ductility, fracture, and fragmentation at high strain rate using Electromagnetic Ring Expansion Tests (ERET) on Laser Melting Powder Bed Fusion (LPBF) Inconel 718 stress relieved test pieces. An empirical model to predict porosity type and growth rates based on laser energy density was established to select LPBF process parameters. The study found a significant positive strain rate effect on tensile ductility at lower porosities.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
N. Hasani, C. Dharmendra, M. Sanjari, F. Fazeli, B. S. Amirkhiz, H. Pirgazi, G. D. Janaki Ram, M. Mohammadi
Summary: In this study, Inconel 718 superalloy cylindrical rods were fabricated using L-PBF technology in the vertical orientation. After stress relief and solution treatment, microsegregation was significantly reduced, delta phase was completely dissolved, and a more uniform microstructure was achieved. Different grain morphologies were observed in the planes parallel and perpendicular to the build direction after solution treatment.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Saeed Khademzadeh, Claudio Gennari, Andrea Zanovello, Mattia Franceschi, Alberto Campagnolo, Katya Brunelli
Summary: This study investigated the microfabrication of Ni-based superalloy Inconel 718 through laser powder bed fusion (LPBF) technique, and examined the mechanical behavior of heat-treated samples. The results showed that using optimum input energy density led to a homogenous distribution of particles, and the ageing temperature played a crucial role in the mechanical strength.
Article
Materials Science, Multidisciplinary
Ala'aldin Alafaghani, Muhammad Ali Ablat, Hossein Abedi, Anwar Al Gamal, Ala Qattawi
Summary: The recent development of metal additive manufacturing has provided a new approach to fabricating complex IN718 parts, but these parts typically have anisotropic mechanical properties and are inferior to conventionally produced parts. This study focuses on post-processing heat treatments to improve the microstructure and mechanical properties of additive manufactured IN718. The results show that modifying the heat treatment temperature can enhance the isotropy, Young's modulus, and ductility of the material.
Article
Automation & Control Systems
Anthony P. Marino, Shyam Balasubramanian, Matthew Carl, Mike Corliss, Wayne Hung
Summary: This study investigates the printing parameters and post-printing heat treatment for laser powder bed fused Inconel 718. Variations in printing scanning speeds and energy densities were made, and different types of heat treatments were applied. The quality of the samples was measured by examining porosity, hardness, defects, and microstructure. The results show that specific scanning speed and energy density result in the lowest porosity and increased material hardness. Furthermore, the use of thermal heat treatments effectively reduces the presence of Laves phases and improves the fatigue life of the samples.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jiun-Ren Hwang, Jing-Yuan Zheng, Po-Chen Kuo, Chou-Dian Huang, Chin-Ping Fung
Summary: This study optimized the manufacturing parameters of LPBF casting Inconel 718 alloy using the Taguchi method and principal component analysis, finding that the optimal combination can achieve the highest tensile strength, with the interlayer angle being the most important control factor.
Article
Nanoscience & Nanotechnology
Z. X. Zhang, H. Y. Wan, Q. D. Hu, W. Chen
Summary: The use of a novel heat treatment strategy, including homogenization and water cooling, can enhance the tensile properties of L-PBFed Inconel 718 by tailoring the grain structure and precipitates. Increasing the homogenization time improves ductility significantly, while water cooling suppresses undesirable phases and promotes beneficial precipitation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Materials Science, Composites
B. Yelamanchi, E. MacDonald, N. G. Gonzalez-Canche, J. G. Carrillo, P. Cortes
Summary: This study investigates the mechanical properties of additively-manufacturing-enabled FML, which is a structure composed of metal and composite materials. The results show that the FMLs have good adhesion at the metal-composite interface, but limited intralaminar performance. It was also found that the impact performance of the FMLs improved by 9-13% compared to the constituent elements. The study provides an initial research foundation for using 3D printing in the production of hybrid laminates.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Brian Vuksanovich, Callan Herberger, Timothy Daugherty, Jason Walker, Pedro Cortes, Eric MacDonald, Dean Jaric, Stephanie Gaffney, Rich Lonardo, Mike Clancy, Richard Huff, Sairam Ravi, Jerry Thiel
Summary: Additive Manufacturing enables casting complex geometries directly from digital design data, but challenges in casting quality and yield arise. Introducing sensors to collect data and improving ventilation design can enhance casting quality.
INTERNATIONAL JOURNAL OF METALCASTING
(2022)
Article
Metallurgy & Metallurgical Engineering
Brian Vuksanovich, Cameron Gygi, Pedro Cortes, Jesus Chavez, Eric MacDonald, Ryan OHara, Anton Du Plessis
Summary: Additive manufacturing is used to digitally fabricate complex sand molds for castings, but inspecting these 3D-printed molds and cores before pouring metal can be challenging. X-ray computed tomography is utilized to evaluate the cleanliness and dimensional accuracy of the cores prior to casting.
INTERNATIONAL JOURNAL OF METALCASTING
(2022)
Article
Polymer Science
Francesco Sillani, Ramis Schiegg, Manfred Schmid, Eric MacDonald, Konrad Wegener
Summary: Powder bed fusion of polymers is increasingly used to customize the properties of end-use products. This study found that the roughness of the top surface of an unmelted powder bed can be used as a proxy for powder bed density.
Article
Computer Science, Information Systems
Khaled Alsharif, Alexander H. Pesch, Vamsi Borra, Frank X. Li, Pedro Cortes, Eric Macdonald, Kyosung Choo
Summary: The study developed an intuitive model for electrochemical cells based on a simple mechanical analogy, which accurately predicted the time-response dynamics of the cells. By optimizing modal parameters and validating the tuned parameters, the mechanical analog model was found to effectively predict the behavior of the cells.
Article
Engineering, Manufacturing
Francesco Sillani, Eric MacDonald, Janely Villela, Manfred Schmid, Konrad Wegener
Summary: Process monitoring with a laser profilometer integrated in a commercial polymer laser sintering machine allows for part qualification and process improvement. The study found that powder layer quality is influenced by recoating speed, preheating temperature, and particle shape, and that curling increases with decreasing preheating temperature.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Juergen Lenz, Eric MacDonald, Ramy Harik, Thorsten Wuest
Summary: With the increasing prevalence of smart products, the manufacturing industry also relies on data and insights to improve quality, efficiency, and safety. This paper discusses the vision of utilizing the sensing and communication abilities of smart products during their manufacturing process to enhance the data of smart manufacturing systems, as well as the barriers and opportunities involved in this paradigm shift.
MANUFACTURING LETTERS
(2022)
Article
Multidisciplinary Sciences
Ana C. Martinez, Alexis Maurel, Ana P. Aranzola, Sylvie Grugeon, Stephane Panier, Loic Dupont, Jose A. Hernandez-Viezcas, Bhargavi Mummareddy, Beth L. Armstrong, Pedro Cortes, Sreeprasad T. Sreenivasan, Eric MacDonald
Summary: This study explores the key aspect of achieving fully functional 3D printed electrodes through a precursor approach: a compromise between electrochemical and mechanical performance. In addition, it discusses the gaps that limit the multi-material 3D printing of batteries via the VPP process.
SCIENTIFIC REPORTS
(2022)
Article
Polymer Science
Jose Angel Diosdado-De la Pena, Charles M. Dwyer, David Krzeminski, Eric MacDonald, Alberto Saldana-Robles, Pedro Cortes, Kyosung Choo
Summary: This research focuses on the manufacturing, testing, and modeling of thermoplastic polyurethane lattices. Using a Kelvin unit cell, non-graded and spatially side-graded lattices were designed and built. Experimental and numerical analysis showed good agreement between the simulated and experimental results under quasi-static and dynamic compressive loads.
Editorial Material
Chemistry, Physical
Alexis Maurel, Ana C. Martinez, Donald A. Dornbusch, William H. Huddleston, Myeong-Lok Seol, Christopher R. Henry, Jennifer M. Jones, Bharat Yelamanchi, Sina Bakhtar Chavari, Jennifer E. Edmunson, Sreeprasad T. Sreenivasan, Pedro Cortes, Eric MacDonald, Cameroun G. Sherrard
ACS ENERGY LETTERS
(2023)
Article
Automation & Control Systems
Thomas Feldhausen, Bharat Yelamanchi, Alexander Gomez, Anton Du Plessis, Lauren Heinrich, Kyle Saleeby, Kenton Fillingim, Brian Post, Lonnie Love, Pedro Cortes, Eric MacDonald
Summary: The combination of additive and subtractive manufacturing in hybrid directed energy deposition allows for the creation of complex geometries with smooth surfaces and high dimensional accuracy. Ceramic inserts are used for various purposes, such as creating composite materials or integrating sensors within a metal structure. Different strategies were tested to successfully embed ceramic components within a 3D-printed stainless steel structure, including the use of wet powder as a thermal barrier and oblique angle laser cladding to redirect thermal energy.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Polymer Science
Charles M. Dwyer, Jose G. Carrillo, Jose Angel Diosdado de la Pena, Carolyn Carradero Santiago, Eric MacDonald, Jerry Rhinehart, Reed M. Williams, Mark Burhop, Bharat Yelamanchi, Pedro Cortes
Summary: Additive manufacturing allows for the production of volumetrically varying lattice structures with tailored mechanical response. The use of elastomers as feedstock provides high viscoelasticity and durability, making them suitable for wearable applications. Siemens' Mithril software was utilized to design different lattice configurations, which were then fabricated using vat photopolymerization and thermoplastic material extrusion processes. Both materials offered unique benefits, with compliance and impact protection provided by SIL30 elastomer and increased stiffness provided by Ultimaker TPU filament.
Proceedings Paper
Computer Science, Information Systems
Grant Parker, Eric MacDonald, Theo Zinner, Mark Yampolskiy
Summary: This paper focuses on the security of indirect manufacturing using additive manufacturing (AM), specifically the creation of molds or mold inserts. The study reveals distinct characteristics and potential security threats of indirect manufacturing compared to direct manufacturing.
CPSS'22: PROCEEDINGS OF THE 8TH ACM CYBER-PHYSICAL SYSTEM SECURITY WORKSHOP
(2022)
Article
Engineering, Electrical & Electronic
Carlos R. Mejias-Morillo, Jayaprakash B. Shivakumar, Seng Loong Yu, Blake Roberts, Pedro Cortes, Eric Macdonald, Anton Polotai, Eduardo A. Rojas-Nastrucci
Summary: Additive manufacturing technology allows for rapid and low-cost prototyping and system repair. This paper investigates the electromagnetic properties of 3D-printed YSZ and platinum ink, and tests the performance of antennas made from these materials, which exhibit high gain and good front-back ratio at specific frequencies.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Khaled Alsharif, Alexander H. Pesch, Vamsi Borra, Frank X. Li, Pedro Cortes, Eric Macdonald, Kyosung Choo
Summary: This study extends the dynamic system previously developed for estimating voltage response to accurately estimate the heat generation rate due to electrochemical reactions in lithium-ion batteries. The estimated parameters are coupled with a thermal model to predict temperature profiles, and experimental tests validate the accuracy of the model.