Article
Engineering, Chemical
Ernesto Urionabarrenetxea, Jose Manuel Martin, Alejo Avello, Alejandro Rivas
Summary: This study utilizes Computational Fluid Dynamics (CFD) techniques to model and simulate the gas flow in a close-coupled gas atomizer. The results show that the geometric variables of the nozzle play an important role in the gas flow and atomization process.
Article
Metallurgy & Metallurgical Engineering
Ali Asgarian, Rodolfo Morales, Markus Bussmann, Kinnor Chattopadhyay
Summary: In this study, a mathematical model for predicting the velocities of water droplets and entrained gas in a flat fan spray was improved, and a new concept of 'effective momentum flux' was introduced. A correlation was proposed for the powder mass median size versus the effective momentum flux of the water spray based on lab-scale water atomization experiments.
Article
Chemistry, Physical
Krzysztof Matus, Grzegorz Matula, Miroslawa Pawlyta, Jagoda Krzysteczko-Witek, Blazej Tomiczek
Summary: Ceramic injection moulding and gas-pressure infiltration were used to manufacture alumina/AlSi10Mg composites. The manufactured materials exhibited a percolation type of microstructure and lacked unfilled pores. The particle-matrix interface showed diversified connections without a transition zone or with a continuous transition zone of thickness not exceeding 30 nm. These composites hold promise in the automotive industry due to their improved mechanical properties and low density.
Article
Engineering, Chemical
Xin Wang, Bing Luo, Minghao You, Cai Liang, Daoyin Liu, Jiliang Ma, Xiaoping Chen
Summary: This paper discusses the significance of gas pressurization in powder beds and presents an experimental and modeling study on gas flow characteristics during gas pressurization in compressible powder beds. The compression and permeation characteristics of the powder under gas pressurization are obtained, and the analysis reveals that the coal powder bed has a higher average compression ratio compared to the glass powder bed. The study also investigates the pressure drop evolution during pressurization and proposes a model that considers both changes in porosity and particle shape to accurately describe gas flow in compressible powder beds.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Yeeun Lee, Cheenepalli Nagarjuna, Jun-Woo Song, Kwang Yong Jeong, Gian Song, Jinkyu Lee, Jong-Hyeon Lee, Soon-Jik Hong
Summary: This study explored the fabrication of Al0.5CoCrFeMnNi high-entropy alloy (HEA) powders by gas atomisation process and investigated their powder characteristics. The results revealed that the produced alloy powders have spherical shape, smooth surfaces, and compositional homogeneity, making them widely acceptable for additive manufacturing applications.
Article
Metallurgy & Metallurgical Engineering
Yeong Gyun Nam, Kyoung-Hoon Bae, Hearan Kim, Sangsun Yang, Yong-Jin Kim, Jung Woo Lee, Jae Won Jeong
Summary: An amorphous soft magnetic alloy based on Mo-containing alloys with abnormal GFA was developed, enabling the preparation of fully amorphous soft magnetic powders through gas atomisation. The alloy demonstrated high saturation magnetisation and suitability for high-frequency applications.
Article
Engineering, Manufacturing
Adrien Da Silva, Joerg Volpp, Alexander F. H. Kaplan
Summary: This study observed the process of aluminium alloy powder flow under different laser powers and particle sizes, finding that powder focusing increased with higher laser power and some particles disintegrated in the laser beam. It was demonstrated that particle disintegration is likely caused by the momentum induced by the recoil pressure.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Chemical
Haifeng Lu, Jiakun Cao, Domenico Macri, Xiaolei Guo, Haifeng Liu, Xin Gong
Summary: This study investigated the fluidization behavior of solid particles when switching between different gases as fluidizing agents, finding that changing gases led to a sharp decrease in bed pressure drop, significant compression of the emulsion phase, disappearance of bubbles, and formation of temporary channels inside the bed, which could be restored to initial fluidization conditions after a certain time.
Article
Multidisciplinary Sciences
Lin Jiang, Wen Zhao, Jianguo Huang, Yang Fan, Jiaqing Hao
Summary: The study focuses on the effects of interactions in natural gas/water/rock system on hydrocarbon migration and accumulation process in tight formation. Both macroscopic and microscopic investigations are conducted using formation fluorescence tests, production data analysis, mathematical analysis, and experimental methods. Numerical simulations are utilized to visualize and quantify the effects, showing that an increase in geological temperature and pressure leads to changes in contact angle and interface tension, ultimately affecting the charging threshold in rock formations.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Abdul Basyir, Robby Kurnia, Cherly Firdharini, Didik Aryanto, Wahyu Bambang Widayatno, Agus Sukarto Wismogroho
Summary: This research investigates the effect of different types of hot gas atomisation and melting pot temperatures on the particle size distribution, microstructure, density and phase of tin alloy powder products. The results show that hot argon gas atomisation produces the highest density and most spherical-shaped powder, while hot oxygen gas atomisation produces the lowest density and most irregular-shaped powder.
Article
Engineering, Chemical
Akshya K. Pandey, Paula Alvaredo, Srdjan Milenkovic, Federico Sket
Summary: Pre-alloyed powders of near-eutectic composition were produced by gas atomization methods for powder bed fusion. The Crucible-Free atomization method resulted in powders with desirable physical properties, although dendritic oxide Fe2Ti4O was formed due to the alloy's high oxygen affinity. The study utilized various characterization techniques to understand solidification behavior and microstructure differences in powder particles of different sizes, revealing the presence of meta-stable phases and ultrafine inter-lamellar spacing in the eutectic matrix.
Article
Metallurgy & Metallurgical Engineering
Chang Liu, Xin Li, Shi Shu, Yu-he Huang, Xing-gang Li, Qiang Zhu
Summary: Numerical simulation was conducted to reveal the flow mechanism of metal melts in melt delivery nozzle during gas atomization process, showing that numerical models could predict the melt flow process in the MDN reasonably. With the decrease of MDN inner-diameter, the melt flow resistance increased, leading to a higher yield of fine powder and improved surface quality of powders.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Engineering, Manufacturing
Andre Hatem, Christiane Schulz, Thomas Schlaefer, Jeff T. Boobhun, Nikki Stanford, Colin Hall
Summary: The research highlights the significant impact of powder feedstock characteristics on the manufacturing of martensitic stainless steel elements by Laser Metal Deposition (LMD). Water- and gas-atomised powders influence properties such as particle size distribution, morphology, and microstructure. The choice of powder processing route has been shown to affect energy absorption during LMD, leading to differences in microstructure, wear rate, and pitting potential in the deposited material.
ADDITIVE MANUFACTURING
(2021)
Article
Metallurgy & Metallurgical Engineering
Erika Soares Barreto, Jan Wegner, Maximilian Frey, Stefan Kleszczynski, Ralf Busch, Volker Uhlenwinkel, Lutz Maedler, Nils Ellendt
Summary: Laser powder bed fusion of metals (PBF-LB/M) has the advantage of manufacturing large bulk metallic glasses with size and geometrical variety. However, the oxygen absorption during the production process can negatively affect the quality and formation of amorphous parts. This study investigates the oxygen absorption in Cu-Ti-based alloys during gas-atomization and additive manufacturing, and its relationship with amorphous phase formation and glass-forming ability (GFA). Results show that oxygen absorption increases, with a significant influence from the starting feedstock, especially for commercial-grade (CP) material. TEM analysis reveals the absence of oxygen-induced nucleation in both the commercial powder and PBF-LB/M samples. This research contributes to the improvement of qualification and economic processability of amorphous metals through PBF-LB/M.
Article
Thermodynamics
Weiming Song, Jianan Zhou, Yujie Li, Jian Yang, Rijin Cheng
Summary: The proposed technology increases the concentration of combustible gases in high-temperature flue gas by injecting dust-removal coke powder and catalyzing their reaction with metal oxide. This innovative solution provides a new direction for the efficient and clean utilization of industrial waste gas, converting it into valuable resources.
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)