Article
Automation & Control Systems
Anoop K. Unni, Vasudevan Muthukumaran
Summary: The study investigates the influence of different oxygen contents in the weld pool on fluid flow and weld bead dimensions through numerical simulation and experiments. The research finds that there is a critical oxygen content required for complete reversal of fluid flow in the weld pool.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Guoliang Qin, Chao Feng, Hong Ma
Summary: Tandem TIG welding extends the existence time of liquid metal through thermal and mechanical control effects, preventing premature solidification and efficiently suppressing weld appearance defects.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Metallurgy & Metallurgical Engineering
Shu-wan Cui, Yong-hua Shi, Cheng-shi Zhang
Summary: When the heat input is 2.30-2.62 kJ/mm, the K-TIG welds show good formation with no obvious defects. As the heat input increases, the high-angle grain boundary proportion in the WMZ increases, while the tensile strength gradually decreases and the elongation and impact toughness of the WMZ increase.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Achmad Ariaseta, Abdul Khaliq Khan, Joel Andersson, Olanrewaju Ojo
Summary: The microstructure of the weld fusion zone (FZ) obtained after a specific welding process and post-weld heat treatments of a new nickel-based superalloy called G27 is studied. The behavior of grain growth in the base material (BM) during the heat treatments is characterized. Analytical transmission electron microscopy is used to identify the microconstituents in the FZ and assess their impact on the mechanical properties of the weldment. The results show that complete elimination of detrimental constituents in the FZ is achieved through a specific heat treatment process without excessive grain growth in the BM.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Tsung-Lin Hsieh, Stephen Garoff, Robert D. Tilton
Summary: This study investigates the Marangoni spreading dynamics and Marangoni synergism of binary surfactant mixtures. Experimental and modeling results confirm the synergistic effects of strong binary surfactant attraction on both surface tension reduction and Marangoni spreading. The study also finds that the thermodynamic parameter controls the spreading velocities at early times, while the kinetics of adsorption and desorption influence the occurrence of Marangoni synergism at later times.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Minqiu Lan, Chuyi Xie, Bin Li, Shengxiong Yang, Fei Xiao, Shuai Wang, Junwu Xiao
Summary: This research presents a new method to improve the long-term durability of transition-metal sulfide catalysts and successfully prepares a two-dimensional cobalt sulfide holey sheet superstructure. By adding an iron-nitrogen-carbon layer as a protective layer, the structural stability of cobalt sulfide is preserved, and it exhibits exceptional activity and durability during catalysis.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Engineering, Manufacturing
Dipali Pandya, Amarish Badgujar, Nilesh Ghetiya
Summary: The A-TIG welding process significantly increases weld penetration for stainless steel, but may result in a high amount of slag deposited on the weld surface. Novel variants of the process, such as Flux Bounded TIG and Flux Zone TIG, offer potential solutions to this issue and enhance the future research scope.
MATERIALS AND MANUFACTURING PROCESSES
(2021)
Review
Nuclear Science & Technology
Vishwa Bhanu, Ankur Gupta, Chandan Pandey
Summary: This review focuses on the Activated-Tungsten Inert Gas (A-TIG) welding process for Dissimilar Welded Joints (DWJ) in nuclear grade ferritic/martensitic steels and austenitic steels. A-TIG welding is compared with Multipass-Tungsten Inert Gas (M-TIG) welding based on their mechanical and microstructural properties. The article discusses the principles, working parameters, and flux's role in the A-TIG welding process, as well as the differences in weld characteristics between martensitic and austenitic steel DWJs developed with A-TIG and M-TIG welding processes.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Mathematics, Interdisciplinary Applications
Stefan Rhys Jeske, Marek Sebastian Simon, Oleksii Semenov, Jan Kruska, Oleg Mokrov, Rahul Sharma, Uwe Reisgen, Jan Bender
Summary: This study presents a novel SPH model for simulating the TIG spot welding process and compares it with two FEM-based models. An improved particle to grid interpolation method is also proposed. The results show that the SPH method can produce excellent results and validate its accuracy for industrial engineering applications.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Materials Science, Coatings & Films
Yu S. Korobov, H. L. Alwan, M. A. Filippov, N. N. Soboleva, I. A. Alani, S. Kh Estemirova, A. Makarov, V. A. Sirosh
Summary: This study demonstrates that the strain-induced martensitic transformation significantly enhances the cavitation erosion resistance of Fe-Cr-C-Al-Ti deposited layers, making them 4 and 10 times more resistant compared to E308L-17 and AISI 316L, respectively. The gamma-to-alpha' transformation is mainly responsible for this enhanced resistance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Tsuyoshi Tsujioka, Keishi Yamabayashi, Kazuma Kotani
Summary: Research has investigated the differences between the glass transition temperature and molecular motions on the surface of organic films compared to the bulk glasses. It was found that vacuum deposition of photochromic diarylethene film results in fluidity on the surface, and the deposition of small amounts of rubrene molecules causes fluctuations in surface tension, generating nanoscale dents due to Marangoni flow. The depth of the dents increases proportionally to the radii for colorless diarylethene films with a bulk glass transition temperature close to room temperature. However, the depth becomes constant for colored diarylethene films obtained through UV irradiation. The distribution of Tg in the depth direction is determined through the analysis of dent depth, revealing that the outermost surface Tg is about 100 K lower than the bulk Tg for photoisomerized diarylethene.
Article
Thermodynamics
K. Sefiane, R. E. Christy, G. Duursma, J. C. Ebeling, T. Seewald, S. Harmand
Summary: There is growing interest in the use of self-rewetting mixtures for micro-scale heat transfer systems. These fluids, with increased surface tension at higher temperatures, are expected to provide enhanced evaporative cooling performance. However, the mechanism behind these improvements is not fully understood. Through studying the flow within evaporating drops of 1pentanol-water mixtures, researchers have observed three stages in the evaporation process. These stages involve the formation of a toroidal vortex, pulsating vortex, and radial outward flow.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Chao Fu, Yongqiang Wang, Siliang He, Chenlu Zhang, Xing Jing
Summary: The study shows that the microstructure of the heat affected zone and fusion zone in the weld joint made of near-alpha titanium alloy Ti-4Al-2V is more complex compared to the base metal, with the presence of texture affecting the mechanical properties. The mechanical properties of the fusion zone are inferior, with lower hardness compared to the base metal, indicating a need for further investigation and improvement in weld joint reliability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Thermodynamics
Mengting Xiang, Feng Wang, Zhihao Wang, Weibo Yang
Summary: This paper investigates the effect of dust deposition on frosting characteristics of fin surfaces through experimental and theoretical analysis. The results show that dust deposition has different effects on frost formation, and the superhydrophobicity of the superhydrophobic surface is influenced by dust deposition.
APPLIED THERMAL ENGINEERING
(2024)
Article
Materials Science, Multidisciplinary
Samuel Berman, Ainur Zhussupbekova, Jos E. Boschker, Jutta Schwarzkopf, David D. O'Regan, Igor Shvets, Kuanysh Zhussupbekov
Summary: Metal-insulator transition materials, such as NbO2, have attracted much attention in recent years for their potential applications in computing and sensing. This study presents a combined theoretical and experimental investigation of the band gap and electronic structure of the insulating phase of NbO2. The results indicate the possible presence of a two-dimensional anisotropic metallic layer at the (100) surface of NbO2.
Article
Chemistry, Physical
L. Somlyai-Sipos, P. Baumli, A. Sycheva, G. Kaptay, E. Szori-Doroghazi, F. Kristaly, T. Miko, D. Janovszky
APPLIED SURFACE SCIENCE
(2020)
Review
Chemistry, Physical
George Kaptay
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
Dheeraj Varanasi, Daniel Koncz-Horvath, Anna Sycheva, Peter Baumli, George Kaptay
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2020)
Article
Materials Science, Multidisciplinary
M. Czagany, D. Varanasi, A. Sycheva, D. Janovszky, D. Koncz-Horvath, F. Kristaly, P. Baumli, G. Kaptay
Summary: The Cu/AlN-Al2O3 nano-multilayer was deposited on 42CrMo4 steel samples using magnetron sputtering method, revealing that at high temperatures, Cu nanocrystals coarsen and migrate within the multilayer, even forming micron-sized reservoirs. As the temperature increases, cracks appear in the AlN-Al2O3 layers, causing Cu to be exposed on the surface of the NML.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Shiyi Wen, Yuling Liu, George Kaptay, Yong Du
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2020)
Article
Engineering, Chemical
Alexandra Jakab-Nacsa, David Stomp, Laszlo Farkas, George Kaptay
Summary: Experimental studies have shown a strong positive effect of NaCl addition on the decomposition rate of chlorate in aqueous solutions. It is more reasonable in the chlor-alkali industry to first saturate the brine with sodium chloride and then eliminate chlorate by adding HCl to protect the electrolysis cell from chlorate ions.
PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING
(2021)
Editorial Material
Materials Science, Multidisciplinary
George Kaptay, Philip Nash
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Xavier Mettan, Edoardo Martino, Lidia Rossi, Jacim Jacimovic, Juraj Krsnik, Osor S. Barisic, Norbert Babcsan, Sandor Beke, Rajmund Mokso, George Kaptay, Laszlo Forro
Summary: Shaping metals into foam can modulate their physical properties, making them attractive for applications where lightweight, low thermal conductivity, and acoustic isolation are desired. Adjusting the size of bubbles in the foam is crucial for targeted applications. The study shows promising potential for the application of metal foams in thermoelectric materials.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
D. A. Angel, T. Miko, F. Kristaly, M. Benke, Z. Gacsi, G. Kaptay
Summary: The study investigated the kinetics of transformation of 5 w% TiB2 nano-particles dispersed in a Ti matrix, finding that a complex Avrami kinetics described the transformation better than the classical one-step Avrami kinetics due to the formation of oxide inhibitors from contaminants.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
M. Czagany, D. Koncz-Horvath, P. Baumli, G. Kaptay
Summary: In this paper, AlN-Al2O3 coatings with thicknesses ranging from 50 to 680 nm were deposited on a steel substrate by magnetron sputtering, and the phase inversion process of the steel/ceramic/copper configuration to the steel/copper/ceramic configuration was investigated. The results showed that the wettability of solid deoxidized steel by liquid copper is good, while the wettability of the ceramic by copper is poor. The flow of copper along the cracks in the ceramic depends on the thickness of the ceramic and can be enabled when the coating thickness is below a critical value. The stability of the steel/copper/ceramic configuration is further enhanced by gravity.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Shiyi Wen, Yong Du, Jing Tan, Yuling Liu, Peng Zhou, Jianzhan Long, George Kaptay
Summary: In this study, a new thermal conductivity model was developed for two-phase composite materials, which can accurately reproduce experimental values and establish the temperature and grain size dependence. The model shows good agreement with measured data and provides a foundation for further development and material design in cemented carbides and particle-reinforced composite materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Zsolt Salyi, George Kaptay, Daniel Koncz-Horvath, Laszlo Somlyai-Sipos, Peter Zoltan Kovacs, Attila Lukacs, Marton Benke
Summary: The goal of this research is to study the applicability of the diffusion boriding process to enhance the lifetime of steel selective soldering tools. Experimental results show that the double-phase iron-boride coating exhibits excellent resistance against the aggressive liquid solder alloy, which is the main reason for the failure of selective soldering tools made of steel. Thermodynamic calculations support the results of the dissolution tests.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Chemistry, Physical
Shiyi Wen, Jing Tan, Jianzhan Long, Zhuopeng Tan, Lei Yin, Yuling Liu, Yong Du, George Kaptay
Summary: This study investigates the thermal conductivity of two-phase WC-Co-Ni cemented carbides and its dependence on phase composition, temperature, and WC grain size. Through a combination of experiments and models, a reliable model for calculating the thermal conductivity of two-phase WC-Co-Ni is established and verified using experimental data. Furthermore, this model is used to predict the thermal conductivity of two-phase WC-Co-Ni under different phase-fractions, temperatures, and WC grain sizes, which can aid in designing cemented carbides with desired thermal conductivities.
Article
Thermodynamics
Dora Janovszky, Maria Sveda, Anna Sycheva, Ferenc Kristaly, Ferenc Zamborszky, Tomasz Koziel, Piotr Bala, Gyorgy Czel, George Kaptay
Summary: The passage highlights the significant number of scientific papers on bulk amorphous alloys and metallic glasses. Utilization of DSC is crucial in studying and developing amorphous alloys, as well as ensuring quality. The research focuses on a variety of properties determination and microstructural transformations induced by thermal treatment.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Metallurgy & Metallurgical Engineering
D. Varanasi, K. E. Aldawoudi, P. Baumli, D. Koncz-Horvath, G. Kaptay
Summary: This study aimed to measure the non-wetting to wetting transition temperatures of liquid tin on various steel surfaces in vacuum conditions. The experiment found that the contact angles of liquid tin on steel surfaces decreased with increasing temperature, with varying transition temperatures between low alloyed steels and high chromium steels. The formation of intermetallic compounds at the interface contributed to the relatively high contact angle values observed, which were different from metal/metal couples like liquid Cu on steel.
ARCHIVES OF METALLURGY AND MATERIALS
(2021)