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Mechanisms of cast structure and stressed state formation in Hadfield steel

China Foundry 2016年第6期13卷 433-442页

作者： Dmitri Gorlenko Konstantin Vdovin Nikolay Feoktistov Nosov Magnitogorsk State Technical University Magnitogorsk Russia

The paper describes the investigation of mechanisms of cast structure formation in Hadfield steel depending on the changes in the cooling rate of a casting in the following two temperature ranges: crystallization temperature(1,200-1,390 °С) and the temperature of excessive phase separation(560-790 °С). Changes in the cooling rate of the crystallization temperature range from 1.1 to 25.0 °С·s^(-1) result in the reduction of the average size of austenite grains from 266 to 131 μm. At the same time, the magnitude of developing shrinkage stresses changes from +195 to 0 MPa. When the cooling rate is higher than 16 °С·s^(-1), no shrinkage stresses are formed in the casting. Changes in the cooling rate of the casting in the temperature range of the excessive phase separation influence the number of phases, their morphology and chemical composition, the values of phase stresses, and the possibility of martensitic transformation. Changing in the cooling rate from 0.24 to 5.46 °С·s^(-1) results in the decrease of the amount of the excessive phase from 14.8% to 2.1%, which is composed of eutectic and carbides depending on the cooling rate, their quantitative ratio and morphology change. Such changes in the microstructure are reflected on the changes of value of developing phase stresses. When the cooling rate is 0.24 °С·s^(-1), it is +100 MPa, while the increase of the cooling rate to 1.4 °С·s^(-1) results in the decrease of tensile stresses to 0 MPa and their qualitative stresses change to compressive ones. Further increase of the cooling rate results in the increase of the value of compressive stresses. When the cooling rate is 5.5 °С·s^(-1), their value reaches-92 MPa. Martensite forming in the structure of Hadfield steel is possible if the cooling rate of the casting in the range of excessive phase separation is less than 0.25 °С·s^(-1).

关键词： Hadfield steel crystallization austenite excessive phase stress

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Optimization of the Cooling System of Electric Vehicle Batteries

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Fluid Dynamics & Materials Processing 2022年第3期18卷 835-850页

作者： A.Heri Iswanto Iwan Harsono Alim Al Ayub Ahmed Sergushina Elena Sergeevna Stepan Krasnikov Rustem Zalilov John William Grimaldo Guerrero Liliya N.Latipova Safa Kareem Hachim Public Health Department Faculty of Health ScienceUniversity of Pembangunan Nasional Veteran JakartaJakarta16426Indonesia Universitas Mataram West Nusa Tenggara83116Indonesia School of Accounting Jiujiang UniversityJiujiang330300China National Research Ogarev Mordovia state university Saransk430005Russia Russian Technological university Moscow119454Russian Nosov Magnitogorsk State Technical University Magnitogorsk455000Russian Departamento de Energía Universidad de la CostaBarranquilla080002Colombia Kazan Federal university Kazan628400Russia College of technical Engineering The Islamic UniversityNajaf54001Iraq

The most important components of electrical vehicles are the battery and the related cooling system.These subsystems play a major role in determining the overall electric vehicle performances.In this study,a novel cooling system with fluid in the battery cell is proposed,by which the energy storage system can be optimized through control of the temperature of the batteries.A sensitivity analysis is conducted considering the maximum temperature,the heat rate,the coolant temperature,and the geometry of the cavities.The numerical simulations show that the parameters for the trapezoidal compartment have an impact on the thermal performance of battery.An optimal geometry is proposed accordingly.It is concluded that for high values of Reynolds number for which the flow becomes turbulent,a decrease in the battery temperature can be obtained thereby avoiding thermal stresses.

关键词： Thermal flow batteries geometry cavity cooling system

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深冷异步轧制制备高力学性能CrCoNi中熵合金

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Transactions of Nonferrous Metals Society of China 2022年第5期32卷 1559-1574页

作者：吴雨泽张朝阳刘娟 Charlie KONG Yu WANG Puneet TANDON Alexander PESIN 喻海良中南大学高性能复杂制造国家重点实验室长沙410083 中南大学机电工程学院长沙410083 中南大学轻合金研究院长沙410083 Mark Wainwright Analytical Centre University of New South WalesSydneyNSW 2052Australia PDPM Indian Institute of Information Technology Design and ManufacturingJabalpur 482005India Laboratory of Mechanics of Gradient Nanomaterials Nosov Magnitogorsk State Technical UniversityMagnitogorsk 455000Russia

为了获得具有更好强塑性平衡的CrCoNi中熵合金,采用冷轧、异步轧制、深冷轧制和深冷异步轧制4种工艺对中熵合金CrCoNi进行加工,并对合金进行不同温度的退火处理。研究结果表明:深冷异步轧制的合金获得超过1.6 GPa的高强度,当经过1073 K... 详细信息

为了获得具有更好强塑性平衡的CrCoNi中熵合金,采用冷轧、异步轧制、深冷轧制和深冷异步轧制4种工艺对中熵合金CrCoNi进行加工,并对合金进行不同温度的退火处理。研究结果表明:深冷异步轧制的合金获得超过1.6 GPa的高强度,当经过1073 K的退火处理后,在具有接近60%的伸长率的同时,仍然保留接近1 GPa的强度。采用深冷异步轧制和退火后,得到较室温异步轧制更为明显的异质特征,这使材料具有更高的强度与更好的塑性。

关键词：中熵合金异质结构退火力学性能深冷异步轧制

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Application of Vortex Generators to Remove Heat Trapped in Closed Channels

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Fluid Dynamics & Materials Processing 2023年第1期19卷 15-24页

作者： Alim Al Ayub Ahmed Salim Oudah Mezan Binyamin Murtadha Doghiam Abdullah Elena Tesleva Linar G.Akhmetov Rustem Zalilov Mustafa M.Kadhim Abduladheem Turki Jalil School of Accounting Jiujiang UniversityJiujiang332000China General Directorate of Education in Al-Muthanna Governorate Ministry of EducationSamawah66001Iraq Department of Mechanical Engineering Faculty of Science and TechnologyUniversitas Muhammadiyah Kalimantan TimurSamarinda75124Indonesia College of Petroleum Engineering Al-Ayen UniversityThi-Qar64001Iraq National Research Tomsk Polytechnic university Tomsk634050Russia Kazan Federal university Kazan420008Russian Nosov Magnitogorsk State Technical University Magnitogorsk455000Russia Department of Dentistry Kut University CollegeKutWasit52001Iraq College of technical Engineering The Islamic UniversityNajaf7003Iraq Department of Pharmacy OsolAldeen University CollegeBaghdad993P+PWXIraq Faculty of Biology and Ecology Yanka Kupala State University of GrodnoGrodno230023Belarus

The utilization of vortex generators to increase heat transfer from cylinders installed inside a duct is investigated.In particular,a channel containing eight cylinders with volumetric heat sources is considered for different values of the Reynolds number.The effective possibility to use vortex generators with different sizes to increase heat transfer and,consequently,reduce the surface temperature of the cylinders is examined.Also,the amount of pressure drop inside the channel due to the presence of vortex generators is considered and compared with the cases without vortex generators.The results show that although the addition of generators increases the pressure drop,it strongly contributes to increase the heat transfer coefficient inside the duct(up to 80–90%).

关键词： Vortex generators heat trapped temperature of hot surfaces heat transfer

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Rock Strength Estimation Using Several Tree-Based ML Techniques

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Computer Modeling in Engineering & Sciences 2022年第12期133卷 799-824页

作者： Zida Liu Danial Jahed Armaghani Pouyan Fakharian Diyuan Li Dmitrii Vladimirovich Ulrikh Natalia Nikolaevna Orekhova Khaled Mohamed Khedher School of Resources and Safety Engineering Central South UniversityChangsha410083China Department of Urban Planning Engineering Networks and SystemsInstitute of Architecture and ConstructionSouth Ural State UniversityChelyabinsk454080Russia Faculty of Civil Engineering Semnan UniversitySemnan35131-19111Iran Department of Geology Mine Surveying and Mineral ProcessingNosov Magnitogorsk State Technical UniversityMagnitogorsk455000Russia Department of Civil Engineering College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia Department of Civil Engineering High Institute of Technological StudiesMrezgua University CampusNabeul8000Tunisia

The uniaxial compressive strength(UCS)of rock is an essential property of rock material in different relevant applications,such as rock slope,tunnel construction,and foundation.It takes enormous time and effort to obtain the UCS values directly in the laboratory.Accordingly,an indirect determination of UCS through conducting several rock index tests that are easy and fast to carry out is of interest and importance.This study presents powerful boosting trees evaluation framework,i.e.,adaptive boosting machine,extreme gradient boosting machine(XGBoost),and category gradient boosting machine,for estimating the UCS of sandstone.Schmidt hammer rebound number,P-wave velocity,and point load index were chosen as considered factors to forecast UCS values of sandstone samples.Taylor diagrams and five regression metrics,including coefficient of determination(R2),root mean square error,mean absolute error,variance account for,and A-20 index,were used to evaluate and compare the performance of these boosting trees.The results showed that the proposed boosting trees are able to provide a high level of prediction capacity for the prepared database.In particular,itwas worth noting that XGBoost is the best model to predict sandstone strength and it achieved 0.999 training R^(2) and 0.958 testing R^(2).The proposed model had more outstanding capability than neural network with optimization techniques during training and testing phases.The performed variable importance analysis reveals that the point load index has a significant influence on predicting UCS of sandstone.

关键词： Uniaxial compressive strength rock index tests machine learning techniques boosting tree

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Fabrication and Characterization of High-Bonding-Strength Al/Ti/Al-Laminated Composites via Cryorolling

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Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 871-880页

作者： Juan Liu Yuze Wu Lin Wang Hui Wang Charlie Kong Alexander Pesin Alexander PZhilyaev Hailiang Yu state Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Light Alloys Research Institute Central South UniversityChangsha 410083China Research Center for Advanced Science and Technology The University of TokyoMeguroTokyo 1530041Japan Mark Wainwright Analytical Centre University of New South WalesSydneyNSW 2052Australia Laboratory of Mechanics of Gradient Nanomaterials Nosov Magnitogorsk State Technical UniversityMagnitogorskRussia 455000

Sandwich-like Al/Ti/Al-laminated composites have many advantages such as low density and high specific strength with value in mechanical manufacturing and aerospace engineering. Here, Al/Ti/Al-laminated composites were fabricated by hot roll bonding and subsequent processes: cryorolling(-190 ℃ and-100 ℃), cold rolling(25 ℃), and hot rolling(300 ℃). Their bonding strength and mechanical properties were then studied by an Autograph AGS-X universal electronic testing machine. The results show that cryorolling can improve the interface bonding strength and tensile strength of Al/Ti/Allaminated composites. For the Al/Ti/Al-laminated composites subjected to cryorolling at-100 ℃, they have the highest strength near 260 MPa—this is 48 MPa and 41 MPa higher than the laminated composites subjected to cold and hot rolling, respectively. These results also show the strongest peeling strength. Finally, the mechanisms of the enhancement of bonding strength and mechanical properties of Al/Ti/Al-laminated composites subjected to cryorolling were mainly discussed.

关键词： Laminated composites Cryorolling Bonding strength Peeling strength Mechanical property Bonding mechanism

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Effect of spatial heterogeneity on level of rejuvenation in Ni80P20 metallic glass

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Chinese Physics B 2022年第9期31卷 435-443页

作者： Tzu-Chia Chen Mahyuddin KM Nasution Abdullah Hasan Jabbar Sarah Jawad Shoja Waluyo Adi Siswanto Sigiet Haryo Pranoto Dmitry Bokov Rustem Magizov Yasser Fakri Mustafa A.Surendar Rustem Zalilov Alexandr Sviderskiy Alla Vorobeva Dmitry Vorobyev Ahmed Alkhayyat Dhurakij Pundit university Bangkok 10210Thailand Data Science and Computational Intelligence Research Group Universitas Sumatera UtaraMedanIndonesia Optical Department College of Health and Medical TechnologySawa UniversityMinistry of Higher Education and Scientific ResearchAl-MuthanaaSamawahIraq College of Health&Medical Technology Al-Ayen UniversityIraq Faculty of Engineering Universitas Muhammadiyah SurakartaJawa Tengah 57102Indonesia Department of Mechanical Engineering Faculty of Science and TechnologyUniversitas Muhammadiyah Kalimantan TimurSamarinda 75124Indonesia Institute of Pharmacy Sechenov First Moscow State Medical University8 Trubetskaya St.Bldg.2Moscow 119991Russia Kazan Federal university KazanRussia Department of Pharmaceutical Chemistry College of PharmacyUniversity of MosulMosul-41001Iraq Department of Pharmacology Saveetha Dental College and HospitalSaveetha Institute of Medical and Technical SciencesChennaiIndia Nosov Magnitogorsk State Technical University MagnitogorskRussia Innovative university of Eurasia PavlodarRepublic of Kazakhstan K.G.Razumovsky Moscow state university of Technologies and Management(The First Cossack university) Moscow 109004Russia College of technical Engineering The Islamic UniversityNajafIraq

Understanding the relation between spatial heterogeneity and structural rejuvenation is one of the hottest topics in the field of metallic glasses(MGs).In this work,molecular dynamics(MD)simulation is implemented to discover the effects of initial spatial heterogeneity on the level of rejuvenation in the Ni_(80)P_(20)MGs.For this purpose,the samples are prepared with cooling rates of 10^(10) K/s-10^(12) K/s to make glassy alloys with different atomic configurations.Firstly,it is found that the increase in the cooling rate leads the Gaussian-type shear modulus distribution to widen,indicating the aggregations in both elastically soft and hard regions.After the primary evaluations,the elastostatic loading is also used to transform structural rejuvenation into the atomic configurations.The results indicate that the sample with intermediate structural heterogeneity prepared with 10^(11) K/s exhibits the maximum structural rejuvenation which is due to the fact that the atomic configuration in an intermediate structure contains more potential sites for generating the maximum atomic rearrangement and loosely packed regions under an external excitation.The features of atomic rearrangement and structural changes under the rejuvenation process are discussed in detail.

关键词： metalic glasses mechanical properties molecular dynamics simulation disordered solids

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Possibilities of mapping neotectonic elements based on the interpretation of space images:A study of Fergana Depression

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Geodesy and Geodynamics 2022年第6期13卷 602-608页

作者： Umurzakov Rakhimjan Abdurazakovich Rabbimkulov Samariddin Asatovich Tashkent state technical university TashkentUzbekistan

For the current geological mapping of individual territories,remote sensing and geographic information system(GIS)technologies are widely used.Taking the Fergana depression as an example,this paper aims to determine the possibilities of using remote sensing materials for mapping structural and geomorphological elements.Landsat-8 satellite imagery obtained on 11 spectral channels was used to highlight the decoding features.Fault zones,lineament zones,various uplifts,depressions,and structural material complexes of different ages were identified.Based on the in-depth analysis of geological and geophysical data,a geological schematic map of the Fergana depression was developed.Using geological landscape and automated methods for deciphering space images,the main neotectonic elements of the Fergana depression were identified:the southern step,northern marginal slope,central graben-syncline,flexurefault zones,local anticlinal zones,individual uplifts/depressions,and local shear zones.The results show a neotectonic map of the study area,which can be used as a tectonic basis for prospecting,seismic zoning mapping,and geological engineering development.

关键词： Neotectonic elements Faults Lineaments Space images Uplifts and depressions

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Digital Earth surface maps for radar ground clutter simulation

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Journal of Systems Engineering and Electronics 2022年第2期33卷 340-344页

作者： ORESHKINA Margarita STEPANOV Maksim KISELEV Alexey Novosibirsk state technical university Novosibirsk 630073Russia

This paper dwells upon optimizing the azimuth samp-ling interval of digital surface maps used to model radar ground clutter.The resulting equations can be used to find the digital map sampling interval for the required calculation error and modeled power of the simulated signal,which determines the resulting distribution of backscatter intensity.The paper further showcases how the sampling interval could be increased by pre-processing the map.

关键词： ground clutter mathematical modelling radar simulation

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Mathematical modeling of icing process of the outer surface of the hull for a marine vessel

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Journal of Hydrodynamics 2023年第2期35卷 232-239页

作者： Konstantin Koshelev Andrey Osipov Sergei Strijhak Nikita Tryaskin ISP RAS MoscowRussia Saint-Petersburg state Marine technical university Saint-PetersburgRussia

The task of studying the process of icing is important due to the operation of large ships and fishing vessels in the seas of the Arctic Ocean.In this paper the ice accretion simulation for fishing vessel has been done at different Reynolds and Froude numbers.A hybrid approach was used for modeling:first,the approach based on Reynolds-averaged Navier-Stokes(RANS)model and volume of fluid(VOF)method with interDyMFoam solver was used for ship modelling in waves,second,RANS model and Euler-Lagrangian approach with iceFoam solver for ice accretion process modelling for ship with hull was applied.The k-ωSST turbulence model with wall functions was used for the RANS model.With the help of the interDyMFoam solver,the position of water jet and liquid droplets in space were determined during the movement of the ship and taking into account the waves in the sea.With the help of iceFoam solver,the process of ice accretion on the surface of the vessel was modeled.The calculations were run for different number Reynolds,Froude.The analysis of mesh convergency was done.The distribution of ice thickness and water film on the ship’s surface is obtained.The simulations were performed on a high-performance cluster in parallel mode.

关键词： Ship sea safety climate movement modelling turbulence model water spray droplets velocity ice film mass

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