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Toughening effects of Mo and Nb addition on impact toughness and crack resistance of titanium alloys

Journal of Materials Science & Technology 2021年第20期79卷 147-164页

作者： Shixing Huang Qinyang Zhao Yongqing Zhao Cheng Lin Cong Wu Weiju Jia Chengliang Mao Vincent Ji School of Materials Science and Engineering Northeastern UniversityShenyangLiaoning110819China School of Material Science and Engineering Chang’an UniversityXi’anShaanxi710064China Northwest Institute for Nonferrous Metal research Xi’anShaanxi710016China School of Mechanical Engineering Liaoning Shihua UniversityFushunLiaoning113001China ICMMO/SP2M UMR CNRS 8182UniversitéParis-SaclayOrsay91405France

Ti-6Al,Ti-6Al-2Mo and Ti-6Al-3Nb alloys were prepared to investigate the toughening effects ofβstabilizers Mo and Nb on impact toughness and crack resistance of titanium *** Charpy impact tests showed that the total impact absorbed energy of Ti-6Al-2Mo and Ti-6Al-3Nb(∼64 J)were two times higher than that of Ti-6Al(∼30 J),indicating the higher impact toughness of Ti-6Al-2Mo and Ti-6Al-3Nb *** of load-displacement curves revealed the similar crack initiation energy of Ti-6Al,Ti-6Al-2Mo and Ti-6Al-3Nb(15.4 J,16.1 J and 15.0 J,respectively).However,the higher crack propagation energy of Ti-6Al-2Mo and Ti-6Al-3Nb(46.7 J and 48.3 J,respectively)were about three times higher than that of Ti-6Al(14.4 J),indicating the stronger resistance to crack propagation in Ti-6Al-2Mo and ***-mortem analysis of impact samples demonstrated that the increased dislocation density and deformation twinning were mainly responsible for the stronger resistance to crack propagation in Ti-6Al-2Mo and *** to the invisibility of dislocation activation and deformation twinning during the Charpy impact process,a mathematical model has been proposed to evaluate the effects of Al,Mo and Nb elements on dislocation mobility based on the Yu Rui-huang electron *** of Mo and Nb elements significantly improved the dislocation mobility in Ti-6Al-2Mo and Ti-6Al-3Nb compared to that in Ti-6Al ***,more dislocations were activated in Ti-6Al-2Mo and Ti-6Al-3Nb which supplied the larger plastic deformation under impact loading.A dislocation-based model also has been proposed to interpret the nucleation and propagation of deformation twinning under the impact *** pileup atα/βinterfaces provided potential sites for nucleation of deformation twinning in Ti-6Al-2Mo and ***,deformation twinning facilitated the dislocation motion inαgrains with hard *** increased dislocation mobility and deformation

关键词： Titanium alloy Impact toughness Crack resistance Dislocation mobility Deformation twinning

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Carbide dissolution and austenite grain growth behavior of a new ultrahigh-strength stainless steel

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Journal of Iron and Steel research International 2020年第6期27卷 732-741页

作者： Zhen-bao Liu Xin Tu Xiao-hui Wang Jian-xiong Liang Zhi-yong Yang Yong-qing Sun Chang-jun Wang Institute for Special Steel Institute Central Iron and Steel Research InstituteBeijing 100081China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The isothermal grain growth behavior for a new ultrahigh-strength stainless steel (UHSSS) is investigated in temperature range from 900 to 1150 ℃ and holding time range from 0 to 20 min. In the temperature range from 1000 to 1050 ℃, a bimodal grain size distribution was induced by different austenite grain growth rates which resulted from the weakened pin-ning effect by the partial dissolution of M6C particles along austenite grain boundaries. Further raising heating temperatures, M6C particles almost dissolved and the bimodal grain size distribution phenomenon became weakened, indicating that the austenite grain coarsening temperature of the new UHSSS was close to 1050 ℃. According to the present experimental results, a pragmatic mathematical model based on the Arrhenius equations was developed to predict the austenite grain growth process, which elaborated the influence of heating temperature, holding time and initial grain size on the austenite grain growth. Predictions for the new UHSSS presented a good agreement with experimental results.

关键词： Ultrahigh-strength stainless steel Austenite grain growth Mathematical model M6C particle

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Simulation of recrystallization based on EBSD data using a modified Monte Carlo model that considers anisotropic effects in cold-rolled ultra-thin grain-oriented silicon steel

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1251-1258页

作者： Li Meng Jun-ming Liu Ning Zhang Hao Wang Yu Han Cheng-xu He Fu-yao Yang Xin Chen Metallurgical Technology Institute Central Iron&Steel Research InstituteBeijing 100081China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co.LtdBeijing 102211China

A Monte Carlo Potts model was developed to simulate the recrystallization process of a cold-rolled ultra-thin grain-oriented silicon *** orientation and image quality data from electron backscatter diffraction measurements were used as input information for *** types of nucleation mechanisms,namely,random nucleation,high-stored-energy site nucleation(HSEN),and high-angle boundary nucleation(HABN),were considered for *** particular,the nucleation and growth behaviors of Goss-oriented({011})grains were *** showed that Goss grains had a nucleation advantage in HSEN and *** amount of Goss grains was the highest according to HABN,and it matched the experimental ***,Goss grains lacked a size advantage across all mechanisms during the recrystallization process.

关键词： ultra-thin grain-oriented silicon steel Monte Carlo simulation recrystallization nucleation grain growth Goss grain

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Investigation of processing–microstructure–property relationship using hot compression of a cone-shaped specimen

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Journal of Iron and Steel research International 2020年第8期27卷 922-932页

作者： Wan-hui Huang Pan Zeng Li-ping Lei Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

Gradient microstructure of the specimen was achieved by applying gradient thermoplastic deformation via electric resist-ance heating and hot compression of the cone-shaped specimen. A numerical modeling and experiment tests are conducted to investigate the microstructure evolution and mechanical properties in different regions of the specimen subjected to the gradient process parameters. Microstructure analysis revealed a direct relationship between the grain size and processing parameters. The temperature distribution on the gradient specimen ranges from about 800 to 1110 ℃ and equivalent strain along the axis of symmetry of the specimen section ranges from about 0.1 to 1.2. Under a temperature of 1050 ℃ and the equivalent strain of 0.7, the middle region of the specimen section has fine and equiaxed prior-austenitic grains with an average size of (27?±?11) μm. Corresponding to the processing parameters, the lath martensite variants microstructure in this position with the highest hardness of (946?±?17) HV. Consequently, the linkages among hot compression parameters, microstructure, and material properties of hardness are established via a high-throughput method in a cone-shaped specimen.

关键词： Gradient deformation Hot forging High-throughput Numerical simulation Microstructure Hardness

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Effects of long term aging on microstructure and properties of a tungsten bearing heat resistant alloy

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Journal of Iron and Steel research International 2020年第4期27卷 477-487页

作者： Han-sheng Bao Gang Yang Zheng-zong Chen Zheng-dong Liu Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China

The effects of long-term aging at 700 and 750℃ on microstructure and mechanical properties of a new developed tungsten bearing heat-resistant alloy used for advanced ultra-supercritical power plant was investigated both experimentally and *** results showed that the mechanical properties maintained excellent stability after long-term aging at 700℃ for 10,000h,while the impact absorbing energy decreased sharply after 1000-h aging and then kept constant till 10,*** main precipitates after long-term aging at 700 and 750℃ were M23C6,MC and homogeneous γ′-*** mass fraction of M23C6 carbides increased with increasing aging time,and M23C6 carbides precipitated in shape of chains and lamellas on grain *** slight decrease in MC carbides during aging may be due to degradation *** weight fraction of γ′-phase increased with the aging time,and then changed little after 5000h;γ′-phase exhibited excellent microstructure stability and low coarsening rate during long-term aging at 700℃.However,the coarsening rate of γ′-phase was much higher at 750℃.

关键词： Tungsten Long-term aging Heat-resistant alloy gama′-phase Coarsening rate

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A polyethylene microsphere-coated separator with rapid thermal shutdown function for lithium-ion batteries

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Journal of Energy Chemistry 2020年第5期29卷 33-40页

作者： Chongrong Zhang Hui Li Shixuan Wang Yuliang Cao Hanxi Yang Xinping Ai Faping Zhong Hubei key Lab of Electrochemical Power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhan 430072HubeiChina national Engineering research Center of Advanced Energy Storage Materials Changsha 410205HunanChina

Thermal runaway is the main factor contributing to the unsafe behaviors of lithium-ion batteries(LIBs)in practical *** application of separators for the thermal shutdown has been proven as an effective approach to protecting LIBs from thermal *** this work,we developed a thermal shutdown separator by coating a thin layer of low-density polyethylene microspheres(PM)onto a commercial porous polypropylene(PP)membrane and investigated the thermal response behaviors of the as-prepared PM/PP separator in *** structural and thermal analysis results revealed that the coated PM layer had a porous structure,which facilitated the occurrence of normal charge-discharge reactions at ambient temperature,although it could melt completely and fuse together within very short time periods:3 s at 110℃and 1 s at 120℃,to block off the pores of the PP substrate,thereby cutting off the ion transportation between the electrodes and interrupting the battery ***,the PM/PP separator exhibits very similar electrochemical performance to that of a conventional separator at ambient ***,it performs a rapid thermal shutdown at an elevated temperature of^110℃,thus controlling the temperature rise and maintaining the cell in a safe *** to its synthetic simplicity and low cost,this separator shows promise for possible application in building safe LIBs.

关键词： Thermal shutdown Separator Safety Lithium-ion battery

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Enterprise-wide optimization of integrated planning and scheduling for refinery-petrochemical complex with heuristic algorithm

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1516-1532页

作者： Lifeng Zhang Haoyang Hu Zhiquan Wang Zhihong Yuan Bingzhen Chen State key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

This paper focuses on the integrated problem of long-term planning and short-term scheduling in a largescale refinery-petrochemical complex,and considers the overall manufacturing process from the upstream refinery to the downstream petrochemical *** time scales are incorporated from the planning and scheduling *** the end of each discrete time period,additional constraints are imposed to ensure material balance between different time *** time representation is applied to the planning subproblem,while continuous time is applied to the scheduling of ethylene cracking and polymerization processes in the petrochemical *** enterprise-wide mathematical model is formulated through mixed integer nonlinear *** solve the problem efficiently,a heuristic algorithm combined with a convolutional neural network(CNN),is *** variables are used as the CNN input,leading to the integration of a data-driven approach and classical optimization by which a heuristic algorithm is *** results do not only illustrate the detailed operations in a refinery and petrochemical complex under planning and scheduling,but also confirm the high efficiency of the proposed algorithm for solving large-scale problems.

关键词： planning scheduling refinery-petrochemical convolutional neural network heuristic algorithm

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Resource utilization of slag from desulphurization and slag skimming:A comprehensive recycling process of all components

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International Journal of Mining Science and Technology 2022年第3期32卷 585-593页

作者： Xiao Liu Peng Gao Yuexin Han School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China School of Chemical&Environmental Engineering Shandong University of Science&TechnologyQingdao 266590China State key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China national-local Joint Engineering research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

In order to make the slag from desulphurization and slag skimming(SDSS)to be comprehensively recycled and utilized,a combined process of beneficiation and building materials preparation was proposed to recover iron from SDSS,meanwhile to apply the remaining slag tailings as cement *** this process,three iron-rich products were recovered in stages by clean gravity-magnetic separation,slag tailings were *** powder was prepared by ultrafine grinding of slag *** stability,setting time and cement mortar strength of the slag tailings cements(STC)which were mixed with Portland cement and slag powder were studied *** results showed that a proper overall performance still could be obtained at the slag powder content of 30%.Chemical composition analysis,X-ray diffraction(XRD)analysis,metallographic microscope and scanning electron microscope(SEM)analysis were employed to assess the characteristics of the SDSS and the products obtained from the whole *** results indicated that the three iron-rich products could be used as a raw material for steelmaking and ironmaking and the relatively large amount of calcium silicate(C_(2)S)and tricalcium silicate(C_(3)S)in the slag tailings make the addition of slag powder into the Portland cement feasible.

关键词： Desulphurization and slag skimming Beneficiation Iron-rich products Cement admixture Cementing property

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Impacts of support properties on the vacuum residue slurry-phase hydrocracking performance of Mo catalysts

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Petroleum Science 2023年第4期20卷 2575-2584页

作者： Wei-Wei Feng Ye-Gui Qian Ting-Hai Wang Qing-Yan Cui Yuan-Yuan Yue Pei Yuan Xiao-Jun Bao College of Chemical Engineering Fuzhou UniversityFuzhouFujian350116China Qingyuan Innovation Laboratory QuanzhouFujian362801China

To deeply understand the effects of support properties on the performance of Mo-based slurry-phase hydrocracking catalysts,four Mo-based catalysts supported on amorphous silica alumina(ASA),γ-Al_(2)O_(3),ultra-stable Y(USY)zeolite and SiO_(2) were prepared by the incipient wetness impregnation method,respectively,and their catalytic performances were compared in the vacuum residue(VR)hydrocracking *** is found that the Mo/ASA catalyst exhibits the highest VR conversion among the different catalysts,indicating that both the appropriate amount of acid sites,especially B acid sites and larger mesoporous volume of ASA can enhance the VR hydrocracking into light ***,Mo catalysts supported on the different supports show quite different product distributions in VR *** Mo/ASA catalyst provides higher yields of naphtha and middle distillates and lower yields of gas and coke compared with other catalysts,it is attributed to the highest MoS_(2) slab dispersion,the highest sulfuration degree of Mo species,and the most Mo atoms located at the edge sites for the Mo/ASA catalyst,as observed by HRTEM and XPS *** features of Mo/ASA are beneficial for the hydrogenation of intermediate products and polycyclic aromatic hydrocarbons to restrict the gas and coke formation.

关键词： Slurry-phase hydrocracking Vacuum residue Supports Catalytic performance

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Selective reduction of carbon dioxide into amorphous carbon over activated natural magnetite

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 231-237页

作者： Zhong-qing Liu Jian Zheng Yi Wang Xu Liu School of Chemical Engineering Sichuan UniversityChengdu 610065China

Natural magnetite formed by the isomorphism substitutions of transition metals,including Fe,Ti,Co,etc.,was activated by mechanical grinding followed by H2 *** temperature-programmed reduction of hydrogen(H2-TPR)and temperature-programmed surface reaction of carbon dioxide(CO2-TPSR)were carried out to investigate the processes of oxygen loss and CO2 *** samples were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM),and energy-dispersive X-ray spectroscopy(EDS).The results showed that the stability of spinel phases and oxygen-deficient degree significantly increased after natural magnetite was mechanically milled and reduced in H2 ***,the activity and selectivity of CO2 reduction into carbon were *** deposited carbon on the activated natural magnetite was confirmed as *** amount of carbon after CO2 reduction at 300°C for 90 min over the activated natural magnetite was 2.87wt%higher than that over the natural magnetite.

关键词： carbon dioxide reduction natural magnetite isomorphism substitutions grind activation oxygen-deficient degree amorphous carbon

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