Article
Engineering, Mechanical
Camilla Ronchei, Sabrina Vantadori
Summary: A new analytical approach combining the multiaxial high-cycle fatigue criterion and the Critical Distance Theory has been proposed for assessing the fatigue lifetime of notched components. The accuracy of this approach was evaluated using experimental data on severely notched specimens made of Ti-6Al-4V material, which is of significant interest to industries like biomedicine.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Manufacturing
Ashwani Pratap, Vishwas Divse, Saurav Goel, Suhas S. Joshi
Summary: Previous research on grinding has not fully studied the surface generation mechanism and elastic recovery due to the limitations of single grit scratching. This investigation compared single scratches with adjacent scratches and found that scratch speed and separation distance have significant effects on cutting forces, pile-up area ratio, groove depth, and sub-surface deformation. The experiments also showed that the spacing between two subsequent scratches can greatly affect the scratched surface quality.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Chemistry, Physical
Zhuohan Cao, Qian Liu, Qianchu Liu, Xiaobo Yu, Jamie J. Kruzic, Xiaopeng Li
Summary: This study develops a machine learning-based approach using image data to predict and reconstruct the microstructural features of LPBF fabricated Ti-6Al-4V alloy. The results show that the proposed method can accurately predict the microstructural features under different process parameters, offering potential applications in process optimization and material design in additive manufacturing.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
In-Su Kim, Jeong Mok Oh, Sang Won Lee, Jong-Taek Yeom, Jae-Keun Hong, Chan Hee Park, Taekyung Lee
Summary: This study investigated the effects of processing variables on the globularization of AM-processed Ti-6Al-4V alloy, revealing that a combination of solution treatment, low-temperature forging, and subsequent annealing significantly accelerates the process by reducing the path for boundary splitting in fine martensitic laths induced via solution treatment.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Marine
Jian Sun, Lei Wu, Chengqi Sun
Summary: Notches and defects are important factors influencing the dwell fatigue behavior of Ti-6Al-4V ELI alloy. Dwell fatigue is insensitive to defect size and notches compared to conventional fatigue. Notched specimens exhibit higher dwell fatigue life compared to smooth specimens, with the maximum stress dwell having no influence on fatigue life and failure mechanism. The facet feature is observed in the crack initiation region of notched specimens for both conventional and dwell fatigue. The fine line markings on the facet are attributed to steps on the fracture surface of the alpha grain, as observed through electron backscatter diffraction.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Panagiotis Karmiris-Obratanski, Emmanouil L. Papazoglou, Beata Leszczynska-Madej, Krzysztof Zagorski, Angelos P. Markopoulos
Summary: The study focused on experimental investigation of Ti-6Al-4V ELI machining using high power EDM and graphite electrode. It evaluated machining performances and surface roughness indexes, analyzing the effects of pulse-on current and time on the results with statistical tools.
Article
Automation & Control Systems
Mayara Fernanda Pereira, Bruno Souza Abrao, Amanda Souza Abrao, Alisson Rocha Machado, Mark James Jackson, Amauri Hassui, Rosemar Batista Da Silva
Summary: In the aeronautical industry, abrasive machining processes are used to ensure surface integrity of components. However, machining titanium alloys like the Ti-6Al-4V alloy is challenging due to its properties. Therefore, this study aimed to evaluate the effects of different dressing conditions for a SiC grinding wheel on the surface integrity of the Ti-6Al-4V alloy.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Qilin Li, Kai Ding, Weining Lei, Jiajia Chen, Qingshan He, Zhenzhen Chen
Summary: This study successfully utilized induction brazing to process profiled cBN grinding wheels, achieving optimal results through simulation-designed induction coils and working parameters. Experimental results showed superior performance and grinding quality compared to electroplating, highlighting the effectiveness of the induction brazing method.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Manufacturing
Binoy Kumar Baroi, Promod Kumar Jagadish, Promod Kumar Patowari
Summary: Ti-6Al-4V ELI, an advanced titanium alloy, was studied for its machinability. The use of boric acid powder mixed with deionized water as a dielectric in electrical discharge machining (EDM) was found to be effective. The impact of powder concentration, current, and pulse-on time on material removal rate, tool wear rate, surface roughness, and specific energy consumption was evaluated. The SEM test showed more craters and globules on the surface machined with a lower powder concentration of 5 g/l compared to 15 g/l.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Jeong-Rim Lee, Min-Su Lee, Si Mo Yeon, Jongcheon Yoon, Hyub Lee, Tea-Sung Jun
Summary: Uniaxial compression tests were conducted on Ti-6Al-4 V ELI alloy fabricated by laser powder bed fusion to investigate the anisotropic deformation mechanism. The tests revealed anisotropic mechanical properties, with the sample loaded perpendicular to the building direction exhibiting higher fracture strain and lower yield strength but superior hardening effect compared to the sample loaded along the building direction. Analyses using electron backscatter diffraction and digital image correlation showed a distinctly different trend of dislocation evolution based on the loading directions, with uniform distribution observed in the building direction sample and localization at prior 8 grain boundaries found in the perpendicular direction sample. Microscopic strain distribution mapping indicated that the layered microstructure and prior 8 grain boundary were more sensitive to compressive loading than the surrounding matrix, playing a key role in anisotropic behavior.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Ryotaro Miyake, Hiroyuki Sasahara, Atsushi Suzuki, Seigo Ouchi
Summary: The study investigated the fabrication and finishing of wall-profile machining using wire and arc additive manufacturing with Ti-6Al-4V wire, and examined the possibility of improving machining efficiency by cutting workpieces softened at high temperature. Results showed that although cutting force decreased at high temperature, tool wear rate was high, leading to a significant increase in cutting force due to wear.
APPLIED SCIENCES-BASEL
(2021)
Article
Automation & Control Systems
Berend Denkena, Benjamin Bergmann, Florian Schaper
Summary: Titanium and titanium alloys are widely used in high-performance applications due to their high strength, low density, good corrosion resistance, and excellent biocompatibility. However, they face challenges such as low thermal conductivity, unfavorable chip formation, and chemical interactions with oxygen. This study investigates the chip formation of Ti-6Al-4 V under different cutting speeds and atmospheres, revealing the impact of the surrounding atmosphere on chip formation. It was found that an oxygen-free atmosphere leads to non-periodic segmentation of chips, while air atmosphere leads to segmental chip formation. The use of an oxygen-free atmosphere also reduces friction and lowers the feed force.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Mengmeng Zhang, Jianke Qiu, Chao Fang, Mingjie Zhang, Yingjie Ma, Zhiqing Yang, Jiafeng Lei, Rui Yang
Summary: This article investigates the variation of dislocation structures in Ti-6Al-4V ELI alloy subjected to different stress levels. The results show that stress influences the density of dislocations and the activation of slip systems, which in turn contribute to creep and the formation of low angle grain boundaries.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Automation & Control Systems
Paolo Albertelli, Michele Monno
Summary: This study assessed different cooling lubrication approaches for Ti6Al4V milling, finding that cryogenic cutting is less energy demanding and shows better energy performance compared to dry and conventional cutting.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
K. Yang, X. Yang, Z. L. Zhang, T. T. Zhu, J. Li, X. S. Xiao, Y. X. Liang, B. Jian, C. Li, S. N. Luo
Summary: The spall damage of Ti-6Al-4V alloy fabricated via laser powder bed fusion (LPBF) was investigated through plate impact in the build direction (BD) and the transverse direction (TD), focusing on its mechanisms and microstructure effects. Comparative analysis was performed on conventionally hot-rolled Ti-6Al-4V alloys processed with annealing and quenching. Results showed that the spall strength and Hugoniot elastic limit (HEL) of LPBF-fabricated samples were higher in the TD loading than in the BD loading. The LPBF-fabricated alloy exhibited a lower HEL but similar spall strength compared to conventionally fabricated alloys. The anisotropy in mechanical properties and damage was attributed to columnar prior beta grains, morphological, and crystallographic texture of martensite laths.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Mechanical
M. Wicke, A. Brueckner-Foit, T. Kirsten, M. Zimmermann, F. Buelbuel, H. -J. Christ
INTERNATIONAL JOURNAL OF FATIGUE
(2019)
Article
Nanoscience & Nanotechnology
Andre Reck, Stefan Pilz, Martin Kuczyk, Annett Gebert, Martina Zimmermann
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Materials Science, Multidisciplinary
Maximilian Haack, Martin Kuczyk, Andre Seidel, Elena Lopez, Frank Brueckner, Christoph Leyens
MATERIALS CHARACTERIZATION
(2020)
Article
Chemistry, Analytical
Sascha Pfeil, Konrad Katzer, Anas Kanan, Johannes Mersch, Martina Zimmermann, Michael Kaliske, Gerald Gerlach
Article
Materials Science, Multidisciplinary
L. Deng, A. Gebert, L. Zhang, H. Y. Chen, D. D. Gu, U. Kuehn, M. Zimmermann, K. Kosiba, S. Pauly
MATERIALS & DESIGN
(2020)
Article
Materials Science, Multidisciplinary
M. Haack, M. Kuczyk, A. Seidel, E. Lopez, F. Brueckner, C. Leyens
JOURNAL OF LASER APPLICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Martin Kuczyk, Liliana Kotte, Joerg Kaspar, Martina Zimmermann, Christoph Leyens
FRONTIERS IN MATERIALS
(2020)
Article
Metallurgy & Metallurgical Engineering
Joerg Bellmann, Sebastian Schettler, Sebastian Schulze, Markus Wagner, Jens Standfuss, Martina Zimmermann, Eckhard Beyer, Christoph Leyens
Summary: The conventional fusion welding of dissimilar metals is often limited by the different thermo-physical properties of the joining partners, leading to the formation of brittle intermetallic phases (IMC). Utilizing a pressure welding process like magnetic pulse welding (MPW) can significantly reduce the risk of IMCs. Two strategies are presented in the research to reduce the energy input during MPW and increase the tool coil lifetime, including the introduction of a reactive nickel interlayer and a novel process monitoring system for analyzing characteristic light emission.
WELDING IN THE WORLD
(2021)
Article
Physics, Applied
M. Lederer, A. Reck, K. Mertens, R. Olivo, P. Bagul, A. Kia, B. Volkmann, T. Kaempfe, K. Seidel, L. M. Eng
Summary: The TKD technique can be used to investigate the microstructure of Si-doped hafnium oxide in ferroelectric field-effect transistors, revealing dendritic grains and varying texture intensity with annealing temperatures.
APPLIED PHYSICS LETTERS
(2021)
Article
Polymer Science
Henriette Probst, Konrad Katzer, Andreas Nocke, Rico Hickmann, Martina Zimmermann, Chokri Cherif
Summary: Electrically conductive fibers are essential for various applications in modern textile technology, especially for highly flexible textile structures like wearable smart textiles and fiber elastomer composites. Combining highly stretchable thermoplastic polyurethane with electrically conductive carbon nanotubes through melt spinning technology can achieve both electrical conductivity and elasticity in the resulting yarns, with optimal performance achieved at a CNT content of 5 wt%.
Article
Engineering, Electrical & Electronic
Maximilian Lederer, Pratik Bagul, David Lehninger, Konstantin Mertens, Andre Reck, Ricardo Olivo, Thomas Kampfe, Konrad Seidel, Lukas M. Eng
Summary: The study shows that the properties of hafnium oxide films are greatly affected by the crystallization process, with annealing temperature playing a significant role in influencing the crystallographic properties and microstructure, thereby impacting the ferroelectric properties.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Robotics
Sascha Pfeil, Markus Henke, Konrad Katzer, Martina Zimmermann, Gerald Gerlach
FRONTIERS IN ROBOTICS AND AI
(2020)
Proceedings Paper
Engineering, Mechanical
T. Kirsten, M. Kuczyk, M. Wicke, A. Brueckner-Foit, F. Buelbuel, H-J Christ, M. Zimmermann
MECHANICAL FATIGUE OF METALS: EXPERIMENTAL AND SIMULATION PERSPECTIVES
(2019)