检索结果-南通市图书馆

Prediction of the Charpy V-notch impact energy of low carbon steel using a shallow neural network and deep learning

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1309-1320页

作者： Si-wei Wu Jian Yang Guang-ming Cao State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

The impact energy prediction model of low carbon steel was investigated based on industrial data. A three-layer neural network, extreme learning machine, and deep neural network were compared with different activation functions, structure parameters, and training functions. Bayesian optimization was used to determine the optimal hyper-parameters of the deep neural network. The model with the best performance was applied to investigate the importance of process parameter variables on the impact energy of low carbon steel. The results show that the deep neural network obtains better prediction results than those of a shallow neural network because of the multiple hidden layers improving the learning ability of the model. Among the models, the Bayesian optimization deep neural network achieves the highest correlation coefficient of 0.9536, the lowest mean absolute relative error of 0.0843, and the lowest root mean square error of 17.34 J for predicting the impact energy of low carbon steel. Among the variables, the main factors affecting the impact energy of low carbon steel with a final thickness of7.5 mm are the thickness of the original slab, the thickness of intermediate slab, and the rough rolling exit temperature from the specific hot rolling production line.

关键词： prediction shallow neural network deep neural network impact energy low carbon steel

Influence of impact energy on impact Corrosion-abrasion of High Manganese Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2007年第3期22卷 412-416页

作者：杜晓东 School of Materials Science and Engineering Hefei University of Technology

The impact corrosion-abrasion properties and mechanism of high manganese steel were investigated under different impact energies. The result shows that the wearability of the steel decreases with the increase of the impact energy. The dominant failure mechanism at a lower impact energy is the rupture of extrusion edge along root and a slight shallow-layer spalling. It transforms to shallow-layer fatigue flaking along with serious corrosion-abrasion when the impact energy is increased, and finally changes to bulk flaking of hardened laver caused by deeo work-hardening and heaw corrosion-abrasion.

关键词： wear characteristics abrasion mechanism impact energy high manganese steel impact corrosion-abrasion

Influence of impact energy on work hardening ability of austenitic manganese steel and its mechanism

在线全文

学校读者我要写书评

暂无评论

China Foundry 2012年第3期9卷 248-251页

作者： Li Xiaoyun Wu Wei Zu Fangqiu Liu Lanjun Zhang Xianfeng Engineering Training Center Hefei University of Technology Hefei 230601 China School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China

To further understand the hardening mechanism of austenitic manganese steel under actual working conditions, the work hardening ability was studied and the microstructures of austenitic manganese steel were observed under different impact energies. The work hardening mechanism was also analyzed. The results show that the best strain hardening effect could be received only when the impact energy reaches or exceeds the critical impact energy. The microstructural observations reveal that dislocations, stacking faults and twins increase with raising impact energy of the tested specimens. The hardening mechanism changes at different hardening degrees. It is mainly dislocation and slip hardening below the critical impact energy, but it changes to the twinning hardening mechanism when the impact energy is above the critical impact energy.

关键词： austenitic manganese steel work hardening impact energy microstructure hardening mechanism

Statistical Model for impact and energy Absorption of 3D Printed Coconut Wood-PLA

在线全文

学校读者我要写书评

暂无评论

energy Engineering 2021年第5期118卷 1305-1315页

作者： J.Kananathan M.Samykano K.Kadirgama D.Ramasamy M.M.Rahman Green Kingdom Solutions Sdn.Bhd. Taman Salak SelatanKuala Lumpur57100Malaysia College of Engineering Universiti Malaysia PahangGambangPahang26300Malaysia Faculty of Mechanical&Automotive Engineering Technology Universiti Malaysia PahangPekanPahang26600Malaysia

Fused deposition modeling(FDM)-3D printing has been the favored technology to build functional components in various *** present study investigates infill percentage and infill pattern effects on the printed parts’impact properties through the 3D printing technique using coconut wood-filled PLA *** models are also proposed in the present study with the aim for future property *** to the ASTM standard,fifteen specimens with different parameter combinations were printed using a low-cost FDM 3D printer to evaluate their impact *** analysis was performed using MINITAB to validate the experimental data and model *** experimental outcomes reveal the honeycomb pattern with 75%infill density achieves the highest energy absorption(0.837 J)and impact energy(5.1894 kJ/m^(2)).The p-value from statistical analysis clearly shows that all the impact properties are less than the alpha value of 0.05,suggesting all the properties are vital to determine the impact *** validation process affirms that the generated mathematical model for the energy absorbed and the impact energy is reliable at an acceptable level to predict their respective *** errors between the experimental value and the predicted value are 3.98%for the energy absorbed and 4.06%for impact *** findings are expected to provide insights on the impact behavior of the coconut wood-filled PLA composites prepared by FDM-3D printing and a mathematical model to predict the impact properties.

关键词： impact energy energy absorption response surface methodology coconut wood ANOVA

Effect of Nanoscale Cu-Riched Clusters on Strength and impact Toughness in a Tempered Cu-Bearing HSLA Steel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 537-550页

作者： Yubin Du Xiaofeng Hu Yuanyuan Song Yangpeng Zhang Lijian Rong CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The effect of Cu-riched clusters on strength and impact toughness in a tempered Cu-bearing high-strength low-alloy(HSLA)steel is investigated. With increasing the tempering temperature, it is found that the yield strength increases firstly, achieving the maximum value(~ 1053 MPa) at the tempering temperature of 450 ℃, and then decreases significantly with the rise of tempering temperature. The tempering temperature-dependent yield strength is closely related to the precipitation of Cu-riched clusters. When tempering at 450 ℃, the peak strength will be reached as the nanoscale Cu-riched clusters with small size and high number density will cause a strong precipitation strengthening(~ 492 MPa) due to the dislocation shearing mechanism. However, the Cu-riched clusters will coarsen with further increasing tempering temperature, resulting in obvious decrement of yield strength owing to the dislocation bypassing mechanism. Compared with the yield strength,the variation in impact energy displays an inverse tendency and the impact energy is only 7 J for the sample tempered at 450 ℃. The fracture mode can be well explained by the competition between the cleavage fracture strength( σ F) and “yield strength”( σ Y). Although transgranular cleavage fracture can be found in samples tempered at 450 and 550 °C, the crack propagation along the lath boundaries is prevented in the sample tempered at 550 ℃. The reason is that the number density of Cu-riched clusters at lath boundaries decreases and the segregation of Mo element at the lath boundaries is induced,which will increase the bonding energy.

关键词： High-strength low-alloy(HSLA)steel Cu-riched cluster Strengthening mechanism Lath boundary impact energy

Influence of recycled polyethylene terephthalate fibres on plastic shrinkage and mechanical properties of concrete

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2022年第6期16卷 792-802页

作者： NecatÖZAŞIK Özgür EREN Department of Civil Engineering Eastern Mediterranean UniversityMersin 99628Turkey

Polyethylene terephthalate bottles production has drastically increased year after year due to high versatility of polyethylene terephthalate plastics and considerable consumption of *** tandem with that increase,the major concern of society has been the improper disposal of this non-biodegradable material to the *** deal with this concern,recycled polyethylene terephthalate bottles were incorporated in concrete as fibre reinforcements in this *** objective of this research is to evaluate the mechanical properties of recycled polyethylene terephthalate fibre reinforced concrete(RPFRC)in comparison with control concrete without *** terephthalate fibres with three different diameters(0.45,0.65,and 1.0 mm)and two lengths(20 and 30 mm)were added at various proportions(0.5%,1.0%,1.5%and 2.0%)by volume of concrete in order to determine the effect of fibres initially on compressive,flexural and splitting tensile strengths of *** results revealed that none of the fibres have detrimental effects up to 1%volume fraction,however further addition caused slight reductions on mechanical properties in some *** shrinkage resistance and impact resistance tests were also performed according to related *** terephthalate fibres were observed to have marked improvements on those *** a good performance could be attributed primarily to the bridging effect of fibres.

关键词： recycled PET fibre-reinforced concrete mechanical properties plastic shrinkage impact energy

Effects of Ni content and tempering temperatures on microstructure and properties of medium-carbon cast steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2023年第8期30卷 1524-1536页

作者： Xiao-bo Cui Tian-long Liu Zhi-bin Zheng Zhi-qiang Guo Kai-hong Zheng Pei-xian Han School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Institute of New Materials Guangdong Academy of SciencesNational Engineering Research Center of Powder Metallurgy of Titanium and Rare MetalsGuangdong Provincial Key Laboratory of Metal Toughening Technology and ApplicationGuangzhou 510651GuangdongChina Guangdong Provincial Iron Matrix Composite Engineering Research Center Guangzhou 510651GuangdongChina Jiangxi Lianfeng Investment Casting Co. Ltd.Yichun 336300JiangxiChina

The microstructure evolution and properties of medium-carbon cast steel alloyed with different Ni contents after tempering at various temperatures have been *** addition of 0.47-1.59 wt.%Ni content results in the formation of 16%-36% retained austenite(RA).The blocky and irregular-polygonal RA mainly forms along the prior austenite grain boundaries,and the tempering temperature does not affect the RA *** hardness of medium-carbon cast steel is affected by the precipitation of carbides and the hardness of *** RA content is the main cause of intergranular impact rupture and low impact *** long-strip carbides formed after tempering at 320℃ would further reduce the impact energy of medium-carbon cast *** tempering at 220 and 380℃,the increase in impact energy is attributed to the formation of rod-like and spherical carbides and the low-carbon *** the medium-carbon cast steel with high impact energy,its impact-abrasive wear resistance is more ***-cutting and delamination are the primary wear mechanisms.

关键词： Medium-carbon cast steel Ni content Tempering temperature Hardness impact energy impact-abrasive wear resistance

Estimation of tungsten production from the upper divertor in EAST during edge localized modes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第12期28卷 223-230页

作者：欧靖项农门宗政张凌许吉禅高伟 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Magnetic Fusion Theory Chinese Academy of SciencesHefei 230031China

During edge localized modes(ELMs), the sheath evolution in front of the Experimental Advanced Superconducting Tokamak(EAST) upper divertor is studied to estimate the sputtered tungsten(W) atoms from the divertor target. A large potential drop across the sheath is formed during ELMs by compared with inter-ELMs, and the maximum of sheath potential drop can exceed one thousand of e V in current EAST operation. Due to the enhancement of the sheath potential drop during ELMs, the W physical sputtering yield from the deuterium(D) ions and the impurity ions on the upper divertor target is found to be significant. It is established that the sputtered W yield during ELMs is at least higher by an order of magnitude than inter-ELMs, and D ions and carbon(C) ions are the main ions governing the W production for the current H-mode with ELMs discharges. With increase in the pedestal electron temperature, the maximum of the D and C ion impact energy during ELMs shows a nearly linear increase, and the D ions have sufficient impact energy to cause the strong W physical sputtering. As a consequence, the D ions may dominate the sputtered W flux from the divertor target when the C concentration is controlled less than one percent for the higher heating power H-mode with ELM discharges in near future.

关键词： sheath edge localized modes impact energy

Effect of a self-rotating oxygen lance system on mass transfer between slag and molten steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2021年第2期28卷 152-159页

作者： Qi Gao Wei Wu Jian-guo Zhi Bo Zhang Xiang-chen Li Metallurgical Technology Research Department Central Iron and Steel Research InstituteBeijing 100081China Inner Mongolia Enterprise Key Laboratory of Rare Earth Steel Products Research and Development Baotou 014010Inner MongoliaChina Inner Mongolia Baotou Steel Union Co. Ltd.Baotou 014010Inner MongoliaChina

To improve the efficiency of the steelmaking process,a system of self-rotating lance was designed,and corresponding cold simulation mechanism was *** influence of the self-rotating lance on the mass transfer rate between slag and molten steel was investigated by comparing this novel system with the traditional oxygen *** results show that the self-rotating lance can stably rotate with a gas jet as the power *** mass transfer rate increases with an increase in the top and bottom blow flow rates and with a decline in the lance *** 13.7% of the top blow flow rate is converted to stirring energy,which is approximately twice that of the traditional oxygen lance,and the mass transfer rate can increase by over 30%.Furthermore,the impact energy can be concentrated at different depths of the molten bath by adjusting the rotational *** the same energy density,the mass transfer rate produced by the self-rotating lance is higher;however,the influence of the energy density on the mass transfer rate is low when the rotational speed is 30-50 r/min.

关键词： Self-rotating lance Reaction force Rotational speed Mass transfer rate impact energy