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Difference in microstructural characteristics of stamp-charged co.e and gravity-charged co.e with approximate macrosco.ic performance

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Journal of iron and steel Research International 2024年第5期31卷 1050-1062页

作者： Chong Zou Zheng-yan Huang Jian-yun Li Bin Li Shi-wei Liu Yuan She School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710311ShaanxiChina technical center of Shandong iron and steel co. Ltd.(Laiwu Branch)Jinan271104ShandongChina

The microstructural characteristics including optical texture,porosity and pore structure and chemical structure of stamp-charged co.e(SCC)and gravity-charged co.e(GCC)with similar co.ventional macro-indicators were investigated,and the properties including micro-strength,reactivity of co.e matrix and that after alkali enrichment were co.paratively studied by various characterization *** anisotropic structure of SCC is co.posed of high co.tent of fine mosaic texture,while the co.tent of medium mosaic texture,co.rse texture and fibrous texture is *** statistical average shows that the fine mosaic average of SCC(24.89%)is 3.78 times the GCC average(6.58%),and the co.rse mosaic average(1.24%)is only about 1/3 of the GCC average(3.43%).The porosity of SCC is lower than that of GCC,but tamping process does not lead to the fact that the number of closed pores of SCC is significantly lower than that of *** the structure of SCC is co.pact,its pore number is large and the pore wall is *** of co.e with diameter less than 150 nm seem unaffected by tamping *** aromatic structure of SCC was less ordered than that of GCC,which was speculated to be related to the addition of more low metamorphic co.l in *** microsco.ic strength and structural strength of SCC are lower than those of *** reactivity of co.e matrix is affected by the specific surface area,but it is not the determining factor of its *** improvement in dissolution reactivity of co.e after potassium enrichment is independent of co.e type.

关键词： Stamp-charged co.e Optical texture Porosity Microstructure Reactivity

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High-temperature stability of retained austenite and plastic deformation mechanism of ultra-fine bainitic steel isothermally treated below Ms

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Journal of iron and steel Research International 2024年第8期31卷 2014-2030页

作者： Ting-ting He Feng Hu Kun Wang Wen Zhou Li Li Serhii Yershov Kai-ming Wu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina co.laborative Innovation center for Advanced steels Wuhan University of Science and TechnologyWuhan 430081HubeiChina Zhejiang Tsingshan iron and steel co. Ltd.Qingtian 323903ZhejiangChina

The mechanical properties of the sample and the stability of retained austenite were studied by designing two kinds of ultra-fine bainitic steel with different heat treatment methods austempering above and below Ms(martensite start tem-perature),which were subjected to tensile tests at 20 and 450℃,*** results show that co.pared to room temperature(20℃)tensile properties,the uniform elongation of the sample at high temperature(450℃)significantly ***,the uniform elongation of the sample austempered above Ms decreased from 8.0%to 3.5%,and the sample austempered below Ms decreased from 10.9%to 3.1%.Additionally,the tensile strength of the sample austempered above Ms significantly decreased(from 1281 to 912 MPa),and the sample austempered below Ms slightly decreased(from 1010 to 974 MPa).This was due to the high carbon co.tent(1.60 wt.%),high mechanical stability,low thermal stability for the retained austenite of the sample austempered below ***,the retained austenite deco.posed at high temper-atures,the carbon co.tent and transformation driving force were significantly reduced,the transformation rate increased,and the phase transformation co.tent reduced.

关键词： Ultra-fine bainite Isothermal treatment High-temperature tensile property Retained austenite stability Plastic deformation

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co.parative study on interaction between rare earth oxide refractories and rare earth treated steel

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Journal of iron and steel Research International 2024年第6期31卷 1493-1501页

作者： Ze Meng Guang-qiang Li Cheng Yuan Yi-jiang Zhao Qing Zheng Bin Zeng Yu Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of ironmaking and steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina technical center Lianyuan Iron and Steel Co.Ltd.Loudi417009HunanChina

Refractories have an important effect on the cleanliness of molten *** interaction between CeAlO_(3) refractories and Ce treated steel was explored and co.pared with that between Al_(2)O_(3) refractories and Ce treated *** results show that the Ce co.tent in steel decreases sharply after co.tact with Al_(2)O_(3) refractories and the pick-up of dissolved Al *** with the test of Al_(2)O_(3) refractories,the loss of Ce co.tent is less in the test of CeAlO_(3) refractory,and the total oxygen co.tent and dissolved Al co.tent in steel increase *** dense and co.tinuous Ce_(2)O_(2)S interface layer is observed at the CeAlO_(3) refractories/steel interface,which can serve as the metallurgical isolation layer and hinder the further interaction between refractories and ***,the higher steel cleanliness and less penetration of refractories by molten steel are obtained in the test of CeAlO_(3) *** CeAlO_(3) refractories show a promising prospect in the production of clean Ce treated steel.

关键词： CeAlO_(3)refractory steel Cleanliness Interaction Rare earth

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Formation of free-surface vortex and vortex suppression by rotating stopper-rod at end of tundish casting

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Journal of iron and steel Research International 2024年第5期31卷 1104-1116页

作者： Qing Fang Peng Zhao Hua Zhang Wen-hao Zhou Gang Yu Jia-hui Wang Hong-wei Ni The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Hunan Valin Xiangtan iron and steel co. Ltd.Xiangtan411101HunanChina Hubei Provincial Key Laboratory for New Processes of ironmaking and steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina

A rotating stopper-rod technique was proposed to suppress the formation of free-surface vortex in the *** large eddy simulation model co.pled with volume of fluid model was developed to study the steel–slag–gas three-phase flow *** critical slag entrapment height of the free-surface vortex and mass of residual steel were predicted at different rotating speeds(30,60,90 and 120 r/min)of the rotating *** numerical model was verified by water model *** results showed that by rotating the stopper-rod in the opposite direction of the vortex above the submerged entry nozzle,the formation of vortex can be effectively disturbed and the critical height of the free-surface vortex can be *** for the 2nd strand,when the rotating speeds are 30,60,90 and 120 r/min,the critical height of the free-surface vortex above the 2nd strand is 7.3,4.7,6.3 and 7.4 cm,respectively.A reasonable rotating speed should be 60 r/min,which can reduce about 2 tons of residual *** rotating speeds just can reduce about 1.6 tons of residual steel.

关键词： Tundish Free-surface vortex Stopper-rod Numerical simulation Multiphase flow

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co.parison of co.rosion mechanisms of 510L low alloy steel treated by ACS and EPS techniques under various service environments

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Journal of iron and steel Research International 2024年第2期31卷 501-518页

作者： Bao-sheng Liu Peng-fei Xu Shao-hua Zhang Yan-rui Li Li-ming Mou Jia-li Li Yue-zhong Zhang Pei-mao Fu Fa-cai Shi co.lege of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina co.lege of Chemical and Biological Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina technical center Taiyuan Iron and Steel(Group)Co.Ltd.Taiyuan030003ShanxiChina

The co.rosion mechanism of 510L low alloy steel treated by acid-cleaned surface(ACS)and eco.pickled surface(EPS)techniques in three simulated solutions(S0:atmospheric environment;S1:soil environment;S2:industrial environment)and the influence of interaction between different co.rosive anions on co.rosion were *** results show that the total co.rosion rates of samples in three simulated solutions were in order of S2>S0>S1,which is simultaneously co.related with initial co.rosion dissolution processes as well as after the formation of co.rosion ***3−will inhibit the initial co.rosion owing to the formation of films,whereas HSO3−will accelerate the dissolutions of the matrix based on the synergistic action of HSO3−and Cl−.On the other hand,there is no significant difference in co.rosion rates between the samples treated by ACS and EPS *** EPS technique that is safe,reusable and environmentally friendly can be further widely used in future work.

关键词： co.rosion mechanism Low alloy steel Simulated solution Surface technique Immersion time

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co.e behavior with H_(2)O in a hydrogen-enriched blast furnace:A review

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 959-976页

作者： Feng Zhou Daosheng Peng Kejiang Li Alberto N.co.ejo Haotian Liao Zixin Xiong Dongtao Li Jianliang Zhang School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering The University of QueenslandSt LuciaQLD 4072Australia Baosteel Central Research Institute(R&D center of wuhan iron&steel co. Ltd.)Wuhan 430080China Shougang Research Institute of Technology Shougang Group Corporation Ltd.Beijing 100043China Beijing Key Laboratory of Green Recyclable Process for iron and steel Production Technology Beijing 100043China

Hydrogen-enriched blast furnace ironmaking has beco.e an essential route to reduce co.(2)emissions in the ironmaking ***,hydrogen-enriched reduction produces large amounts of H_(2)O,which places new demands on co.e quality in a blast *** a hydrogen-rich blast furnace,the presence of H_(2)O promotes the solution loss *** result improves the reactivity of co.e,which is 20%-30%higher in a pure H_(2)O atmosphere than in a pure co.(2)*** activation energy range is 110-300 kJ/mol between co.e and co.(2)and 80-170 kJ/mol between co.e and H_(2)***_(2)and H_(2)O are shown to have different effects on co.e degradation *** review provides a co.prehensive overview of the effect of H_(2)O on the structure and properties of *** exploring the interactions between H_(2)O and co.e,several unresolved issues in the field requiring further research were *** review aims to provide valuable insights into co.e behavior in hydrogen-rich environments and promote the further development of hydrogen-rich blast furnace ironmaking processes.

关键词： hydrogen ironmaking co.e behavior blast furnace gasification microstructure kinetics

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Effect of Direct Aging on co.rosion Behavior of AlSi10Mg Alloy Fabricated by Laser Powder Bed Fusion

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 266-282页

作者： Zhen Zhang Zhanyong Zhao Xiaofeng Li Beibei Wang Peikang Bai Shanxi Key Laboratory of co.trolled Metal Solidification and Precision Manufacturing School of Materials Science and EngineeringNorth University of ChinaTaiyuan030051China technical center Taiyuan Iron and Steel(Group)Co.LtdTaiyuan030003China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024China

Effect of direct aging of 170℃on co.rosion behavior of laser powder bed fused AlSi10Mg(LPBF-AlSi10Mg)was studied by microstructure analysis,electrochemical analysis and X-ray photoelectron *** results show that direct aging of 170℃has little effect on melt pool and Si cellular structure,but promotes the precipitation of nano-Si particles and releases the residual *** increasing aging time from 0 to 4 h to 24 h,the co.rosion property of the LPBF-AlSi10Mg is deteriorated,which is evidenced by increased co.rosion current density and decreased pitting potential and polarization *** increasing the aging time,the thickness of the oxide film formed on surface of the LPBF-AlSi10Mg *** Si co.tent of the oxide film of the sample aging for 4 h is the lowest,9.42 at.%,and it is the highest,18.62 at.%,for the sample aging for 24 *** electrochemical noise analysis reveals that the middle-frequency co.tribution of the Hilbert spectrum is responsible for the deteriorated co.rosion performance,which co.responds to metastable pitting initiated by nano-Si particles.

关键词： Laser powder bed fusion AlSi10Mg Direct aging co.rosion

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Microstructure reco.nition of steels by machine learning based on visual attention mechanism

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Journal of iron and steel Research International 2024年第4期31卷 909-923页

作者： Xing-yu Chen Lin Cheng Cheng-yang Hu Yu-peng Zhang Kai-ming Wu The State Key Laboratory of Refractories and Metallurgy Hubei Province Key Laboratory of Systems Science on Metallurgical ProcessingInternational Research Institute for Steel TechnologyCollaborative Center on Advanced SteelsWuhan University of Science and TechnologyWuhan 430081HubeiChina Metals Valley and Band(Foshan)Metallic co.posite Materials co. Ltd.Foshan 528000GuangdongChina

U-Net has achieved good performance with the small-scale datasets through skip co.nections to merge the features of the low-level layers and high-level layers and has been widely utilized in biomedical image segmentation as well as recent microstructure image segregation of the *** representative visual attention mechanism modules,named as squeeze-and-excitation networks,co.volutional block attention module,and extended calibration algorithm,were intro-duced into the traditional U-Net architecture to further improve the prediction *** is found that co.pared with the original U-Net architecture,the evaluation index of the improved U-Net architecture has been significantly improved for the microstructure segmentation of the steels with the ferrite/martensite co.posite microstructure and pearlite/ferrite co.posite microstructure and the co.plex martensite/austenite island/bainite microstructure,which demonstrates the advantages of the utilization of the visual attention mechanism in the microstructure *** reasons for the accuracy improvement were discussed based on the feature maps analysis.

关键词： Microstructure reco.nition-steel Machine learning Visual attention mechanism Visualization

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Effect of nano-carbon black co.tent on wetting phenomenon of molten steel and alumina-carbon ceramic filter substrates

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Journal of iron and steel Research International 2024年第8期31卷 1900-1913页

作者： Jin-wen Song Wen Yan Zhe Chen Ying Liu Shao-song Hong The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina National-provincial Joint Engineering Research center of High Temperature Materials and Lining Technology Wuhan University of Science and TechnologyWuhan 430081HubeiChina Jiangsu Sheng Nai New Materials co. Ltd.Taizhou 225503JiangsuChina

The effect of nano-carbon black co.tent(O,8 and 12 wt.%)on the wettability of molten steel on Al_(2)O_(3)-C substrates was investigated by the sessile drop wetting method at 1500℃ under argon *** the beginning of the wetting experiment,the co.tact angle decreased with the increase in nano-carbon black *** the wetting experiment progressed,FeAl_(2)0_(4) layer and sheet Al_(2)O_(3) layer were found at the interface between the molten steel and the Al_(2)O_(3)-C substrates with O and 8 wt.% nano-carbon black co.tent,and the co.tact angle deceased with *** the co.tent of nano-carbon black was 12 wt.%,a large number of nano-Al_(2)O_(3) whiskers were observed,which made the co.tact angle between the molten steel and Al_(2)O_(3)-C substrate beco.e *** on the scanning electron microsco.e and energy dispersive spectrometry results,the formation mechanism of FeAl2O4 layer and Al_(2)O_(3) layer and the interfacial reaction mechanism were proposed.

关键词： co.tact angle Nano-carbon black Al_(2)O_(3)-C substrate Molten steel Interfacial reaction

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Preparation of yttrium oxide co.ting with enhanced thermal shock resistance on refractories used for titanium alloy melting and casting

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Journal of iron and steel Research International 2024年第6期31卷 1411-1422页

作者： Ao Chen Yan Ma Zhou-fu Wang Hao Liu Xi-tang Wang Sen-na Chen Chen-xin Zhang Zi-yi Tang Wei-dong Fu Wei Cheng The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Xiangyang Juli High Technology Material co. Ltd.Xiangyang 441705HubeiChina Xiangyang Public Inspection and Testing center Xiangyang 441000HubeiChina

In order to enhance the service life of refractories for melting and casting of titanium alloy,preparation of yttrium oxide co.tings on the refractories surface is an effective *** improvement of thermal shock stability of the co.ting is beneficial to its spalling resistance during the high-temperature service,and the available slurry with good performance is the *** effects of the varieties and co.tents of dispersant(sodium tripolyphosphate,sodium hexametaphosphate,sodium pyrophosphate,citric acid and polycarboxylate ammonium salt)and binder(aluminum dihydrogen phosphate,zirco.ium acetate and yttria sol)on the stability,rheological and thixotropic properties of yttrium oxide waterbased slurry were investigated,and the effects of slurry co.position design on the thermal shock resistance of the co.ting were *** results showed that the introduction of polycarboxylate ammonium salt as dispersant significantly improved the stability of the slurry,and the varieties of the binders had significant effects on the dispersibility of the *** aluminum dihydrogen phosphate and polycarboxylate ammonium salt were used as binder and dispersant,respectively,the slurry had better stability,suitable rheological and thixotropic *** using aluminum dihydrogen phosphate as binder,the co.ting had good thermal shock resistance and no obvious cracks were observed for the co.ting after thermal shock,which was attributed to the yttrium aluminate binding phase generated in the *** effective method was provided for preparing yttrium oxide co.tings with enhanced thermal shock resistance applied in the process of titanium alloy melting and casting.

关键词： Yttrium oxide-Slurry Stability Rheological property Thixotropic property-co.ting Thermal shock resistance

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