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Multi-objective Optimization of the Process Design in HSLA Steels Using Physically Based Mean Field Modeling

Metallurgical and materials Transactions A: Physical Metallurgy and materials science 2025年第5期56卷 1887-1901页

作者： Tzini, M.I.T. Haidemenopoulos, G.N. Thøgersen, A. Diplas, S. Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Ave CambridgeMA02139 United States Department of Mechanical Engineering University of Thessaly Volos38334 Greece SINTEF Industry P.O. Box 124 Blindern Oslo0314 Norway

A multi-objective optimization approach is presented for the process design of an X70 HSLA steel plate using a physically based mean field (PBMF) model. The PBFM model incorporates an integrated precipitation and recrystallization model to describe the microstructural evolution due to the interaction of strain-induced precipitation of niobium and titanium carbonitrides and static recrystallization of austenite. An integer multi-objective optimization problem is formulated, and the non-dominated sorting genetic algorithm (NSGA-II) is applied on the PBMF model to determine a list of optimal processing routes that satisfy specific process design constraints. Aiming in increasing the strengthening and fracture toughness of the material, a trade-off between the microstructural objectives is considered;average ferrite grain size after accelerated cooling, niobium content in solution and residual strain at the end of multipass hot rolling. Higher residual strains and lower niobium in solution due to higher degree of strain-induced precipitation result in smaller average ferrite grain sizes. An optimal processing route was selected, and the microstructure and precipitation state of the processed material were characterized experimentally revealing a good agreement with model predictions. The proposed approach can contribute to the process design of HSLA and microalloyed steels. © The Author(s) 2025.

关键词： Multiobjective optimization

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High-performance flexible all-solid-state asymmetric supercapacitors based on binder-free MXene/cellulose nanofiber anode and carbon cloth/polyaniline cathode

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Nano Research 2023年第5期16卷 7696-7709页

作者： Xiaoyu Bi Meichun Li Guoqiang Zhou Chaozheng Liu Runzhou Huang Yang Shi Ben Bin Xu Zhanhu Guo Wei Fan Hassan Algadi Shengbo Ge Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUK School of Textile Science and Engineering&Key Laboratory of Functional Textile Material and Product of Ministry of Education Xi'an Polytechnic UniversityXi'an 710048China College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Electrical Engineering Faculty of EngineeringNajran UniversityNajran11001Saudi Arabia

The search for wearable electronics has been attracted great efforts,there is an ever-growing demand for all-solid-state flexible energy storage ***,it is a challenge to obtain both positive and negative electrodes with excellent mechanical strength and match positive and negative charges to achieve high energy densities and operate voltages to satisfy practical application ***,flexible MXene(Ti_(3)C_(2)Tx)/cellulose nanofiber(CNF)composite film negative electrodes(MCNF)were fabricated with a vacuum filtration method,as well as positive electrodes(CP)by combining polyaniline(PANI)with carbon cloth(CC)using an in-situ polymerization *** positive and negative free-standing electrodes exhibited excellent electrochemical behavior and bendable/foldable *** a result,the all-pseudocapacitance asymmetric device of MCNF//CP assembled with charge-matched between anode and cathode achieves an extended voltage window of 1.5 V,high energy density of 30.6 Wh·kg^(−1)(1211 W·kg^(−1)),86%capacitance retention after 5000 cycles,the device maintains excellent bendability,*** work will pave the way for the development of all-pseudocapacitive asymmetric supercapacitors(ASC)with simultaneously preeminent mechanical properties,high energy density,wide operating voltage window.

关键词： MXene cellulose nanofiber polyaniline asymmetric supercapacitors

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Laser-upgraded coal tar for smart pavements in road and bridge monitoring applications

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Microsystems & Nanoengineering 2024年第2期10卷 231-239页

作者： Jincai Huang Man Zhang Haoyun He Qingang Li Yixin Zhao Qiulin Tan Xining Zang Department of Mechanical Engineering Tsinghua UniversityBeijing100084China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing100084China Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan030051China School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing100083China

The implementation of an intelligent road network system requires many sensors for acquiring data from roads,bridges,and vehicles,thereby enabling comprehensive monitoring and regulation of road *** this large number of required sensors,the sensors must be cost-effective,dependable,and environmentally ***,we show a laser upgrading strategy for coal tar,a low-value byproduct of coal distillation,to manufacture flexible strain-gauge sensors with maximum gauge factors of 15.20 and 254.17 for tension and compression ***,we completely designed the supporting processes of sensor placement,data acquisition,processing,wireless communication,and information decoding to demonstrate the application of our sensors in traffic and bridge vibration *** novel strategy of using lasers to upgrade coal tar for use as a sensor not only achieves the goal of turning waste into a resource but also provides an approach to satisfy large-scale application requirements for enabling intelligent road networks.

关键词： gauge bridge smart

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AI-enabled Lorentz microscopy for quantitative imaging of nanoscale magnetic spin textures

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npj Computational materials 2024年第1期10卷 2102-2111页

作者： Arthur.R.C.McCray Tao Zhou Saugat Kandel Amanda Petford-Long Mathew J.Cherukara Charudatta Phatak Materials Science Division Argonne National LaboratoryLemontILUSA Applied Physics Program Northwestern UniversityEvanstonILUSA Center for Nanoscale Materials Argonne National LaboratoryLemontILUSA Advanced Photon Source Argonne National LaboratoryLemontILUSA Department of Materials Science and Engineering Northwestern UniversityEvanstonILUSA

The manipulation and control of nanoscale magnetic spin textures are of rising interest as they are potential foundational units in next-generation computing *** this requires a quantitative understanding of the spin texture behavior under external stimuli using in situ *** transmission electron microscopy(LTEM)enables real-space imaging of spin textures at the nanoscale,but quantitative characterization of in situ data is extremely ***,we present an AI-enabled phase-retrieval method based on integrating a generative deep image prior with an image formation forwardmodel for *** approach uses a single out-of-focus image for phase retrieval and achieves significantly higher accuracy and robustness to noise compared to existing ***,our method is capable of isolating sample heterogeneities from magnetic contrast,as shown by application to simulated and experimental *** approach allows quantitative phase reconstruction of in situ data and can also enable near real-time quantitative magnetic imaging.

关键词： textures magnetic Lorentz

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Comparison of Showerhead Film Cooling and Double Wall Cooling in a Guide Vane Leading Edge with Hot Streak

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International Journal of Gas Turbine, Propulsion and Power Systems 2024年第1期15卷 24-31页

作者： Chen, Jinfu He, Yang Yao, Ran Wang, Jianhua CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Thermal Science and Energy Engineering United States University of Science and Technology of China Jinzhai Road No. 96 Anhui Hefei230027 China

Under the realistic running conditions of gas turbines, the temperature at mainstream inlet is always non-uniform due to the effects of combustion process, and different types of hot streak (HS) could be found at the inlet. The existence of HS may result in some potential negative impacts on the cooling performances of vane leading edge (LE). Nowadays, the two configurations, i.e., traditional showerhead film cooling (SFC) and novel double wall cooling (DWC), have been widely used in LE designs of turbine vanes, but until now there is no comprehensive study to evaluate the two models considering HS effects. In this work, using the two cooling structures, four different temperature profiles are considered at the mainstream inlet of the cascade. The results reveal that: in both models, HS could cause a local high-temperature region on LE, and the thermal characteristics of this area are dependent on HS pattern. Compared to SFC, DWC shows a better cooling ability and a lower thermal stress on the vane surface. The cooling characteristics in DWC model are less sensitive to the HS pattern. However, the problem of the extremely high thermal stress within the pin-fins of DWC should be carefully considered. © 2024 Gas Turbine Society of Japan. All rights reserved.

关键词： Gas turbines

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Progress on two-dimensional ferrovalley materials

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Chinese Physics B 2024年第1期33卷 32-43页

作者：李平刘邦陈帅张蔚曦郭志新 State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum SystemSchool of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory for Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Jinan Aviation Repair Factory Jinan 250000China Department of Physics and Electronic Engineering Tongren UniversityTongren 554300China

The electron's charge and spin degrees of freedom are at the core of modern electronic devices. With the in-depth investigation of two-dimensional materials, another degree of freedom, valley, has also attracted tremendous research interest. The intrinsic spontaneous valley polarization in two-dimensional magnetic systems, ferrovalley material, provides convenience for detecting and modulating the valley. In this review, we first introduce the development of ***, the valley polarization forms by the p-, d-, and f-orbit that are discussed. Following, we discuss the investigation progress of modulating the valley polarization of two-dimensional ferrovalley materials by multiple physical fields, such as electric, stacking mode, strain, and interface. Finally, we look forward to the future developments of valleytronics.

关键词： ferrovalley valley polarization two-dimensional materials multi-field tunable

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Modeling the tensile behaviour of Al-7075 composites prepared with xB4C under a high flow water cooling rate

Modeling the tensile behaviour of Al-7075 composites prepare...

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2024 International Conference on science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Adediran, Adeolu Adesoji Adewale Akinwande, Abayomi Afolalu, Sunday A. Ikumapayi, Omolayo M. Bello, Kazeem Aderemi Landmark University Department of Mechanical Engineering Kwara State Omu-Aran Nigeria University of Johannesburg Department of Mechanical Engineering Science South Africa Federal University of Technology Department of Metallurgical and Materials Engineering Ondo State Akure Nigeria Afe Babalola University Department of Mechanical Engineering Ado-Ekiti Nigeria Federal University Department of Mechanical Engineering Oye Ekiti Nigeria

ISBN: (纸本)9798350358155

The choice of stir casting has attracted interest among researchers in the development of boron carbide-Al 7075 composites. Most literatures focus on stir casting parameters like stirring temperature, speed, and time with few or no studies on cooling rate which is the last and very essential stage of the process. In this investigation, boron carbide (B4C) was introduced in Al-7075 at constant stirring parameters with varying water cooling rates. The two variables used are A and B for boron carbide dosage (5, 10, 15 wt. %) and water flow rate at room temperature (100, 300, and 500 cm3/s), respectively. The result showed that dosages of 5 to 10 are dispersed within the matrix resulting in enhanced strength while 15 wt. % resulted in particle clustering, thereby leading to depreciation of strength. Meanwhile, increasing the water cooling rate brought about grain refinement which led to improved tensile properties. However, at 500 cm3/s it resulted in the storage of residual stress, which was detrimental to the strength values. At 5 - 15 wt. % and 100 - 500 cm3/s, it amounted to a consecutive decrease in elongation. The statistical analysis showed that the experimental variables significantly affected the tensile properties. From the regression models developed, there were good representations of the data and are statistically fit in predicting the responses. The Optimum condition stipulated was 11.7414 wt. % B4C and 329.7 cm3/s. © 2024 IEEE.

关键词： Grain refinement

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Effect of filler loading and mould size on the mechanical properties of aluminium matrix composites strengthened with calcium carbide waste

Effect of filler loading and mould size on the mechanical pr...

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2024 International Conference on science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Njoku, Chioma Emmanuella Onuoha, Chukwudike Nwaogwugwu, Ugochukwu Chizuruoke Iheke, Nmesomachi Christopher Adediran, Adeolu Adesoji Ikumapayi, Omolayo Adeoti, Olurotimi Federal University of Technology Department of Materials and Metallurgical Engineering Imo State Owerri Nigeria Landmark University Department of Mechanical Engineering Kwara State Omu-Aran Nigeria University of Johannesburg Department of Mechanical Engineering Science South Africa Afe Babalola University Department of Mechanical Engineering Ado-Ekiti Nigeria

ISBN: (纸本)9798350358155

The effect of filler loading and mould size on the mechanical properties of calcium carbide waste-reinforced aluminium matrix composite was investigated. Varying weight percent (0, 10, 20, and 30 wt%) of the calcium carbide waste were used in reinforcing the aluminium ingot by stir casting. The mechanical properties studied were tensile strength, Young's modulus and flexural modulus. Optical microscopy was used in the morphological examination of the produced samples. The results showed a 22.2% improvement in the tensile strength and a 56.4% improvement in the flexural strength at 20 wt% reinforcement of calcium carbide waste and 16 mm mould size. There was an enhancement in Young's modulus, for reinforced composites up to 20 wt% for all the mould sizes. The optical morphological examination showed a coarsening effect as the reinforcement reached up to 30 wt%, which may have caused the decline in the mechanical properties in the 30 wt% calcium carbide waste-reinforced aluminium matrix composite. The study encourages the utilization of calcium carbide waste in the development of less expensive aluminium-based composites for various applications and also for the reduction of calcium carbide waste pollution. © 2024 IEEE.

关键词： Tensile strength

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Applicability of Transition metals as grain refiners in Cu shape memory alloy: potentials and trends

Applicability of Transition metals as grain refiners in Cu s...

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2024 International Conference on science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Adediran, Adeolu A. Babalola, Faith Edoziuno, Francis O. Ajisegiri, Emanuel Landmark University Mechanical Engineering Kwara State Omu-Aran Nigeria University of Johannesburg Mechanical Engineering Science South Africa Landmark University Faith Mechanical Engineering Babalola Nigeria Nnamdi Azikiwe University Metallurgical and Materials Engineering Department Awka Nigeria

ISBN: (纸本)9798350358155

Shape memory alloys and in this context, copper-based shape memory alloys are gaining fast recognition in recent times. Great research is being done on the properties, applicability, production methods, and their limitations. This paper discusses shape memory alloys in general and focuses more on the effect of transitional elements such as scandium, indium, cerium, and others on the mechanical properties of Cu-based SMAs. It was found that when combined in micro quantities transitional metals are great refiners of these alloys which in turn affect the mechanical properties. © 2024 IEEE.

关键词： Scandium alloys

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Investigation of mechanical properties, viscoelastic properties and free vibration analysis of natural fibre reinforced composite materials

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Interactions 2024年第1期245卷 1-21页

作者： SathishKumar, G. Prashanth, K.S. Khatoon, Umme Thahira Selvarani, A. Geetha Sridhar, R. Sivabalan, S. Chakravarthy, P. R. Kalyana V.Vijayan Baskar, S. School of Engineering Vels Institute of Science Technology & Advanced Studies Chennai600117 India Department of Physics New Horizon College of Engineering Bengaluru India Department of Metallurgical and Materials Engineering National Institute of Technology Warangal Hanamkonda India Department of Civil Engineering Vel Tech Rangarajan Dr. Sagunthala R & ampD Institute of Science and Technology Avadi India Department of Mechanical Engineering K.Ramakrishnan College of Technology Tamil Nadu Tiruchirappalli India

This study aims to assess the mechanical properties and damping characteristics of polyester composites reinforced with flax and kenaf fibers, incorporating 5 wt.% each of rice husk and wood dust. The research will employ mechanical testing, dynamic mechanical analysis across various temperatures and frequencies, and Scanning Electron Microscopy (SEM). Experiments will measure tensile strength, flexural strength, impact strength, hardness, natural frequency, and damping coefficient (tan δ). SEM imaging will examine the fractured surfaces of tensile samples. Composites will be fabricated using a manual layup technique, combining mat fiber with 5 wt.% each of rice husk and wood dust. Initial findings suggest that fiber incorporation decreases damping curves (tan δ), while the addition of rice husk and wood dust positively correlates with the composite's natural frequency and damping factor. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Tensile strength

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