Article
Construction & Building Technology
Ming-Xiang Xiong, Peng-Wei Pi, Wei Gong, Min-Feng Yang, Zheng-Feng Ou
Summary: High strength steel (HSS) attracts attention for its economic and environmental benefits, but fire-resistant design and the potential deterioration of its mechanical properties are important considerations. This study investigates the mechanical properties of different strength grades of HSS. The results show that at elevated temperatures, the elastic moduli of S460 and S690 steel are similar, but their strength deterioration differs. The load-carrying capacity of structural members made from these steels is comparable, but at temperatures above 400 degrees Celsius, there are no advantages compared to normal strength steel.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Yuxia Bai, Jin Liu, Yujun Cui, Xiao Shi, Zezhuo Song, Changqing Qi
Summary: The mechanical behavior of a PU polymer-sand mixture is affected by the content of PU polymer, dry density, and temperature. The strength, ductility, and stiffness of the material vary under different conditions, with positive and negative temperatures showing different effects on the treatment of PU.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
M. B. S. Sollero, A. L. Moreno Junior, C. N. Costa
Summary: The exposure of concrete to high temperatures has been shown to reduce its mechanical properties, but studies have produced conflicting results. This article discusses the key factors contributing to this disparity, highlighting the influence of standardization and coarse aggregate types. Brazilian experimental research on the residual mechanical strength of concrete reveals the impact of different coarse aggregate types.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Gustavo Henrique Nalon, Jose Carlos Lopes Ribeiro, Eduardo Nery Duarte de Araujo, Leonardo Goncalves Pedroti, Jose Maria Franco de Carvalho, Rodrigo Felipe Santos, Diogo Silva de Oliveira
Summary: This study found that adding 3% of CBN and 0.4% of MWCNT can improve the mechanical properties of cementitious materials at high temperatures, including residual compressive strength, static and dynamic elastic modulus. A comprehensive comparison of composites containing different carbon-based nanomaterials revealed variations in mechanical properties.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Omrane Benjeddou, Herda Yati Katman, Malek Jedidi, Nuha Mashaan
Summary: Self-compacting concrete (SCC) is characterized by high fluidity and different from ordinary concrete in composition and performance. Experimental tests showed that the compressive strength of SCC increases between 150 and 300 degrees C, but the flexural strength decreases at high temperatures. Additionally, the thermal conductivity of concrete decreases with increasing temperature.
Article
Chemistry, Physical
Mingyu Gu, Chunyan Wu, Xingyu Chen, Yu Wan, Yumeng Liu, Shan Zhou, Hongwei Cai, Bi Jia, Ruzhuan Wang, Weiguo Li
Summary: In this research, the temperature-dependent critical inclusion size for microcracking was estimated under residual stress and applied stress for particulate-reinforced ultra-high-temperature ceramic matrix composites. The study also estimated the critical flaw size and applied stress required for the stable growth of radial cracks under different temperatures. The results showed that the sensitivity of the critical inclusion size to temperature was influenced by the applied stress, with higher applied stresses leading to lower sensitivity. Additionally, the crack resistance of ceramic materials with pre-existing microcracks could be improved by increasing the service stress when the stress was low. A temperature-dependent fracture strength model for composites with a pre-existing critical flaw was proposed and showed good agreement with experimental data.
Article
Nanoscience & Nanotechnology
Eugenio Zapata-Solvas, Bibi Malmal Moshtaghioun, Diego Gomez-Garcia, Arturo Dominguez-Rodriguez, William E. Lee
Summary: This paper examines the mechanical response of hafnium diboride at different temperatures and reveals that it exhibits metal mechanical behavior.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Civil
Hamidreza Asghari, Zkaria Omeman, Martin Noel, Hamzeh Hajiloo
Summary: In this study, the tensile properties of carbon fabric-reinforced cementitious matrix (FRCM) composites were investigated at high temperatures. The results showed that the ultimate strength and cracked elastic modulus of the FRCM composites decreased significantly at high temperatures, and the number of fabric layers and FRCM thickness had a significant influence on the performance. Additionally, the transient-state tests revealed that the thickness of the specimens also affected the failure temperature.
Review
Construction & Building Technology
Sanaz Ramzi, Hamzeh Hajiloo
Summary: Despite progress in the construction industry, fire events remain a severe hazard. This study focuses on the influence of high temperatures on the mechanical characteristics of concrete, including compressive and tensile strength. The inclusion of supplementary cementing materials and different aggregate types significantly affect the mechanical properties of concrete at both high temperatures and room temperature. The findings provide insights for future studies on reinforced concrete structures subjected to high temperatures.
Article
Construction & Building Technology
R. Tomas, M. Cano, L. F. Pulgarin, V Brotons, D. Benavente, T. Miranda, G. Vasconcelos
Summary: The study found that the properties of granite are significantly affected by thermal stress induced by thermal expansion during heat treatment, especially above 500 degrees C, which increases linear crack density and degrades rock properties. Water immersion cooling amplifies thermal effects, leading to uneven shrinkage and tension stress between particles, negatively impacting granite properties.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Cheng Liu, Yalong Liao, Wenling Jiao, Xiaohua Zhang, Ni Wang, Jianyong Yu, Yi-Tao Liu, Bin Ding
Summary: Traditional oxide ceramics are brittle and sensitive to defects, which makes them prone to failure under stress. Electrospinning technology has been used to transform these ceramics from brittle to flexible by fibrillation and refinement of fiber diameter. A self-templated electrospinning strategy is proposed to synthesize oxide ceramic nanofibers without organic polymer template, resulting in nanofibers with high strength and toughness. This work provides a new strategy to develop strong and tough oxide ceramic materials.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Baoguo Wang, Rong Tu, Yinglong Wei, Haopeng Cai
Summary: In this study, a self-healing ceramic composite was prepared using spark plasma sintering at lower temperatures, and it was found that cracks could be completely healed in air above 700 degrees C.
Article
Multidisciplinary Sciences
Zheng Li, Lu An, Saurabh Khuje, Jingye Tan, Yong Hu, Yulong Huang, Donald Petit, Danial Faghihi, Jian Yu, Shenqiang Ren
Summary: Polymer dielectrics used in electrical power systems must possess specific structures such as gel-sheared polyethylene in order to achieve the desired thermal conductivity.
Article
Nanoscience & Nanotechnology
Teng Tu, Xianhua Chen, Tao Chen, Yuan Yuan, Fusheng Pan
Summary: The study demonstrates that adding Ge element to Mg alloys can improve both the elastic modulus and strength, while refining the grain size and promoting the formation of high-modulus phases. The Mg-10Gd-1.5Ag-0.2Mn-3.5Ge alloy exhibits the best comprehensive mechanical properties with a high modulus, strength, and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
Phylis Makurunje, Simon C. Middleburgh, William E. Lee
Summary: This review discusses various approaches to address the high processing temperatures required in reactive melt infiltration (RMI) processing of modern multiphase ceramic matrix composites (CMCs). It focuses on using immiscible phases, miscible phases, silicide phases, and/or silicide eutectics to lower the temperature requirement for RMI, optimizing the composition of incorporated phases, minimizing damage to reinforcing phases, utilizing rapid heating techniques, and developing in situ real-time monitoring systems. Future opportunities include integrating additive manufacturing with RMI, utilizing process modeling, and applying in situ and in operando characterization techniques.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Mechanical
Raj Shah, Mathias Woydt, Nabill Huq, Andreas Rosenkranz
Summary: The paper discusses the relationship between tribology, sustainability, and CO2 emissions, emphasizing the potential for energy savings and emissions reductions through tribological research and development. Implementation of tribological technologies could lead to significant reductions in global CO2 emissions in the immediate and long term, particularly in transportation and power generation sectors.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Irati Zurutuza, Nerea Isasti, Eric Detemple, Volker Schwinn, Hardy Mohrbacher, Pello Uranga
Summary: The combination of boron with other microalloying elements is known to have a synergetic effect on hardenability in high-strength medium carbon steels. Different mechanisms such as solid solution hardening and fine precipitation hardening can optimize mechanical properties. Microstructural refinement is found to be most beneficial to strength and toughness, while unit size heterogeneity has a negative effect on ductile-to-brittle transition behavior. Proving that a steel with high yield strength and low impact transition temperature can be obtained by properly balancing alloy concept and processing.
Article
Materials Science, Multidisciplinary
Irati Zurutuza, Nerea Isasti, Eric Detemple, Volker Schwinn, Hardy Mohrbacher, Pello Uranga
Summary: Through laboratory thermomechanical simulations, the combination of microalloying elements and thermomechanical rolling schedules can optimize the preparation and improve the performance of high-strength steels. Adding Nb and Mo in steel can achieve the highest tensile properties and have higher tempering resistance. Compared to CMnB grade, NbMo micro-alloyed steel shows significantly reduced yield strength softening after tempering.
Article
Engineering, Mechanical
M. Woydt, C. Scholz, J. Burbank, D. Spaltmann
Summary: This study compares the slip-rolling performance of various steel types under high Hertzian contact pressures, with Maraging- and PM-type steel alloys showing superior strength and toughness properties. Traditional bearing steels still compete in terms of slip-rolling and wear resistance and load carrying capacity.
Article
Materials Science, Multidisciplinary
Irati Zurutuza, Nerea Isasti, Eric Detemple, Volker Schwinn, Hardy Mohrbacher, Pello Uranga
Summary: The study investigated the impact of direct quenching and conventional quenching on four different high-strength boron steels, revealing that the addition of Mo and Nb-Mo can enhance hardenability and prevent the occurrence of soft phases in the center of thick plates. This combination of DQ strategy and Mo-alloying concept provides the best option for achieving a fully martensitic microstructure in ultra-high-strength hot rolled plates.
Article
Nanoscience & Nanotechnology
Diego Tolotti de Almeida, Thomas Gabriel Rosauro Clarke, Joao Henrique Correa de Souza, William Haupt, Milton Sergio Fernandes de Lima, Hardy Mohrbacher
Summary: This study evaluates laser welding of heavy gage press hardened steel, with welded samples of the modified steel variant found to have a more favorable microstructure and improved mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
S. G. Huang, C. Liu, B. L. Liu, J. Vleugels, J. H. Huang, B. Lauwers, J. Qian, H. Mohrbacher
Summary: The microstructure, phase constitution, and mechanical properties of Ni bonded (Nb,W,Ti)(C,N) solution cermets were studied, with simulations of phase composition in the sintered cermets. The sintered cermets exhibited a microstructure of Ni alloy binder dispersed in (Nb,W, Ti)(C,N) solid solution grains with core-rim structure.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Irati Zurutuza, Nerea Isasti, Eric Detemple, Volker Schwinn, Hardy Mohrbacher, Pello Uranga
Summary: This work focuses on studying the behavior of boron high strength steels microalloyed with different combinations of Nb and/or Mo during hot working. The role of Nb and Mo in the hot deformation of low carbon steels is well-known and the design of rolling schedules requires microstructural evolution models that consider the effect of these alloying elements. Experimental tests and modeling were conducted in this work, and the results provide insights for optimizing hot working processes.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Irati Zurutuza, Nerea Isasti, Eric Detemple, Volker Schwinn, Hardy Mohrbacher, Pello Uranga
Summary: This paper analyzes the dynamic recrystallization behavior of ultra-high strength boron-microalloyed steels, evaluating the influence of alloy composition on the transformed microstructure. It was found that Nb-microalloyed steel exhibited partial dynamic recrystallization, while the addition of Mo was effective in suppressing this phenomenon. The study also delved into the circumstances initiating dynamic recrystallization and discussed the potential consequences of this phenomenon before quenching.
Article
Materials Science, Multidisciplinary
Diego Tolotti de Almeida, Kleber Eduardo Bianchi, Joao Henrique Correa de Souza, Milton Sergio Fernandes de Lima, Thomas Gabriel Rosauro Clarke, Fabio Pinto da Silva, Hardy Mohrbacher
Summary: This study investigates and compares the fatigue performance of laser-welded joints of two press hardening steels: a standard 22MnB5 and a variant modified by NbMo alloying. The results indicate that joint geometry aspects and intrusion-generated damage mechanism are the main causes of poor fatigue life. The NbMo modified alloy performs better than the standard steel. Laser-welded joints of press hardened steels could offer favorable fatigue performance if tight quality limits are used in the manufacturing procedures, surpassing that of conventional and high strength structural steels.
Article
Materials Science, Multidisciplinary
Johannes Webel, Hardy Mohrbacher, Eric Detemple, Dominik Britz, Frank Mucklich
Summary: The solubility of mixed niobium-titanium carbonitrides in commercially relevant HSLA steel was investigated using electrical resistivity measurements and APT analysis. The study found that the solubility was influenced by the niobium addition and soaking temperature, and the APT analysis agreed well with the electrical resistivity measurements. The influence of insoluble titanium nitrides on microalloy elements was corrected using quantitative image analysis and APT analysis. The experimental solubility of the mixed carbonitrides was found to significantly differ from the solubility of well-established simple carbides and nitrides. Therefore, a robust methodology for quantifying microalloy precipitation in HSLA steels is crucial.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Elias Hoffmann de Lima, Diego Tolotti de Almeida, Daniel Souza, Kleber Eduardo Bianchi, Hardy Mohrbacher
Summary: The application of press hardening steels is expanding to other industries, such as agriculture and road transport. This article investigates the fatigue performance of GMAW-CSC and PAW welding methods on 1500 MPa press hardening steel. The results indicate that both welding methods provide suitable fatigue performance, especially after grinding the weld bead.
Article
Materials Science, Multidisciplinary
Hardy Mohrbacher, Linda Bacchi, Gloria Ischia, Stefano Gialanella, Michele Tedesco, Fabio D'Aiuto, Renzo Valentini
Summary: Press hardening steel commonly uses titanium microalloying to protect boron from nitrogen, ensuring the hardenability effect during die quenching. Additional microalloying elements, such as niobium and vanadium, have been found to improve toughness, bendability, and hydrogen embrittlement resistance. A new press hardening steel incorporates all three microalloying elements and shows enhanced performance compared to standard grade steel.
Article
Engineering, Mechanical
Raj Shah, Mathias Woydt, Stanley Zhang
Summary: Modern industrial processes rely on modern tribological knowledge to ensure equipment integrity and minimize total energy losses. The development of industrial lubricants is crucial to meet increasing performance standards and stringent environmental regulations.
Review
Engineering, Mechanical
Raj Shah, Rui Chen, Mathias Woydt, Christoph Baumann, Joshua Jurs, Philip Iaccarino
Summary: High temperature tribology research ranges from 300-1000 degrees Celsius and plays an important role in studying the friction, wear, and other characteristics of coatings, ceramics, alloys, etc. The use of an SRV tribometer allows for effective measurement of friction parameters at high temperatures.
Article
Engineering, Mechanical
Yankui Song, Ke Xiao, Guo Xiang
Summary: The novelty of this study lies in constructing an Entropy-based wear and fluid-solid-thermal (FST) coupled model for journal bearings, and revealing the transient interaction behavior between wear evolution and FST evolution during repeated starting and stopping. The wear rate is measured experimentally, and the contact temperature, friction coefficient and normal contact force are obtained from the validated FST model. Wear tests and numerical calculations are conducted to validate the predicted wear rate and investigate the time-varying wear and FST evolution of journal bearings.
Article
Engineering, Mechanical
Xin-long Liu, Xin Guan, Yuan Zhong, Qian Xiao, Yong Cao, Wu-lue Zhang, Song Zhang, Yi-ting Zheng, Ming-sheng Gao, Dao-yun Chen, Wen-bin Yang
Summary: Gaps in the conductor rail joints of intercity trains have an impact on current transmission and the wear of carbon skateboards. These gaps decrease the coefficient of friction, increase electrical contact resistance, and affect the wear rate of carbon skateboards.
Article
Engineering, Mechanical
Yuhang Wu, Conglin Dong, Xiuqin Bai, Chengqing Yuan
Summary: The study developed a new composite material by incorporating hexagonal boron nitride (h-BN) particles into a thermoplastic polyurethane (TPU) matrix, which exhibited excellent self-lubricating properties and reduced frictional excitation forces. The addition of h-BN particles effectively reduced the coefficient of friction, decreased fluctuation amplitude, enhanced wear resistance, and attenuated vibration behaviors.
Article
Engineering, Mechanical
Tiancheng Ouyang, Xiuyang Sun, Wentao Tang, Yinxuan Li, Zhi Qun Tian, Yanzhou Li
Summary: By adding nitrogen-doped graphene and C60 nanoparticles to the lubricant, a highly efficient nano-lubricant with vibration and noise reduction properties is synthesized.
Article
Engineering, Mechanical
Xin Zhuo, Jun Cao, Haibo Huang, Li Liu, Xinkun Suo, Peiqing Ye, Zeshan Abbas
Summary: A polymer coating prepared by liquid spraying technology on the surface of 20CrMo steel demonstrates good tribological and anti-cavitation erosive properties. It can effectively replace CuPb24Sn copper alloy in valve plates for pumps under different lubrication conditions. The coating exhibits adhesive wear and reduces frictional loss, and mainly shows abrasive wear under complex working conditions. Its lipophilicity, high hardness to elastic modulus ratio, and corrosion resistance are the main influencing factors for its performance.
Article
Engineering, Mechanical
Md. Aminul Islam, Jiaren (Jimmy) Jiang, Yongsong Xie
Summary: Erosion-corrosion is a major factor in material loss and reduced useful life of hydro-transport equipment. This study evaluates the erosion-corrosion characteristics of different materials and finds that matrix wear affects the degradation of carbides. Sufficient wear and corrosion resistance in the surrounding matrix are important for good erosion-corrosion resistance.
Article
Engineering, Mechanical
Andre Dubois, Oussama Filali, Laurent Dubar
Summary: This study investigates the effect of surface roughness, contact pressure, and lubrication on the onset of galling in aluminum 6082-T6 using a pin-on-plate tribometer. The experimental results show that the roughness and lubricants play a significant role in preventing galling.
Article
Engineering, Mechanical
Jizhan Wu, Peitang Wei, Guoqiang Liu, Difa Chen, Xiuhua Zhang, Taimin Chen, Huaiju Liu
Summary: This study conducted a comprehensive evaluation of the DLC coating treatment on the loading capacity of gears and characterized the surface features and fatigue performance. The results demonstrate that DLC coating significantly improves the hardness and surface residual compressive stress of the gears, as well as enhances their contact fatigue performance.
Article
Engineering, Mechanical
Yangping Liu, Hwaran Lee, Annsley Mace, Jeremy L. Gilbert
Summary: An AFM-based single asperity tribology method was used to investigate the wear performance of carbides and base metal matrix in high carbon CoCrMo alloy. The wear behavior of the two types of carbides was stress-dependent and influenced by chemical composition. Cr-rich carbides exhibited higher wear resistance compared to Mo-rich carbides.
Article
Engineering, Mechanical
Zdenek Riha, Michal Zelenak, Akash Nag, Jakub Poloprudsky, Tomas Kruml, Sergej Hloch
Summary: This study investigates the erosion performances of a high-speed modulated jet (MWJ) and continuous water jet (CWJ). By comparing different nozzles and water jet powers, the effects of modulated and continuous jets on aluminum alloy were studied. The results show that under certain conditions, modulated jet can create deeper and sharper grooves while reducing the impact of lateral flow.
Article
Engineering, Mechanical
Chunyu Yu, Weipu Li, Yang Guo, Xianbin Sun, Fanli Hong, Ning Sun, Qinghai Zhang
Summary: This study explores the relationship between the wear rate of train brake pads and its features, and proposes a method for predicting the wear rate suitable for small sample data. Grey relational analysis and Pearson correlation analysis are used to determine the preferred features that affect the wear rate, and a BOA-BP model is established for prediction. The results show that BOA-BP exhibits better advantages in prediction with small samples.
Article
Engineering, Mechanical
Shan Yin, Xin Zhao, Shuangchao Huang, Zefeng Wen, Xuesong Jin
Summary: This study simulated the rolling contact of a driving wheelset over tangent and curved tracks at a speed up to 500 km/h using an explicit finite element approach to derive creep curves. The comparison between quasi-steady curves and transient curves in the presence of rail corrugation helped to identify cases where traditional theories are inapplicable and where transient effects must be considered. Additionally, the study further analyzed the influence of middle/high-frequency vibrations in the presence of rail corrugation.
Article
Engineering, Mechanical
Jiyao Zhang, Yuanlie Yu, Junlei Tang, Yingying Wang, Honggang Sun, Kaikai Song, Jianhong Gong, Pingping Liu, Xiaoming Liu, Lina Hu, Parthiban Ramasamy, Juergen Eckert
Summary: The influence of high-carbon addition on the microstructure, hardness, and wear behavior of CoCrNi alloy was investigated. It was found that the addition of carbon resulted in the formation of carbide particles, enhancing the hardness and improving the wear resistance. Fracture and detachment of hard carbides during friction introduced additional abrasive particles, transitioning the wear mechanism from adhesive-dominated to abrasive-dominated.
Article
Engineering, Mechanical
Yanfei Liu, Shengtao Yu, Ruize Zhang, Xiangyu Ge, Wenzhong Wang
Summary: This study reports the tribological behavior of nanodiamond plate (NDPL) as a nanoadditive for the first time and compares it with nanodiamond particles (NDPA). The results show that NDPL provides better lubrication performance at higher concentrations, and the sliding between NDPLs and the structural transformation from sp3 to sp2 carbon play a crucial role in lubrication and wear resistance.
