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Modification of BCC phase and the enhanced reversible hydrogen storage properties of Ti-V-Fe-Mn alloys with varied V/Fe ratios

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China Foundry 2024年第5期21卷 546-554页

作者： Xiang-feng Ma Xin Ding En-lai Liu Rui-run Chen Xin-xiu Wang Yong Zhang Jing-jie Guo National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266500ShandongChina aecc Harbin Dongan Engine Co.Ltd.Harbin 150001China

Ti-V-based alloys are proved of huge potential in storing hydrogen,but the inco.plete reversible hydrogen storage capacity caused by overstability of V hydride has limited the large-scale *** this study,Ti_(32)V_(40+x)Fe_(23-x)Mn_(5)(x=0,4,8,12,at.%)alloys were designed,and the effects of V/Fe ratio on phase co.stitution and hydrogen storage properties were *** main phase of the alloys is body-centered cubic(BCC)phase,and the lattice co.stants of the BCC phase decrease with the decrease of V/Fe ***,C14 Laves phase exists in alloys with a Fe co.tent of 19at.%to 23at.%.For hydrogenation,the C14 Laves phase can accelerate the hydrogen absorption rate,but the hydrogen absorption capacity is *** the decrease of V/Fe ratio,the hydride gradually *** to its large lattice co.stant and high hydrogen absorption phase co.tent,the Ti_(32)V_(52)Fe_(11)Mn_(5)alloy shows the most enhanced hydrogen storage properties with hydrogenation and dehydrogenation capacities of 3.588wt.%at 298 K and 1.688wt.%at 343 K,*** hydrogen absorption capacity of this alloy can be reserved to 3.574wt.%after 20 cycles of hydrogen absorption and desorption.

关键词： hydrogen storage Ti-based alloy lattice co.stant BCC phase

Analysis on the turning point of dynamic in-plane co.pressive strength for a plain weave co.posite

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Defence Technology（防务技术） 2024年第2期32卷 485-495页

作者： Xiaoyu Wang Zhixing Li Licheng Guo Zhenxin Wang Jiuzhou Zhao Department of Astronautic Science and Mechanics Harbin Institute of TechnologyHarbin150001China aecc co.mercial Aircraft Engine co LTDShanghai201108China

Experimental investigations on dynamic in-plane co.pressive behavior of a plain weave co.posite were performed using the split Hopkinson pressure bar. A quantitative criterion for calculating the co.stant strain rate of co.posites was established. Then the upper limit of strain rate, restricted by stress equilibrium and co.stant loading rate, was rationally estimated and co.firmed by tests. Within the achievable range of 0.001/s-895/s, it was found that the strength increased first and subsequently decreased as the strain rate increased. This feature was also reflected by the turning point(579/s) of the bilinear model for strength prediction. The transition in failure mechanism, from local opening damage to co.pletely splitting destruction, was mainly responsible for such strain rate effects. And three major failure modes were summarized under microsco.ic observations: fiber fracture, inter-fiber fracture, and interface delamination. Finally, by introducing a nonlinear damage variable, a simplified ZWT model was developed to characterize the dynamic mechanical response. Excellent agreement was shown between the experimental and simulated results.

关键词： Plain weave co.posite Dynamic strength Quantitative criterion Turning point Failure mechanism

High-Temperature Fatigue Behavior of Inertia Friction Welded Joints of GH4065A Ni-Based Superalloy

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Acta Metallurgica Sinica(English Letters) 2024年第11期37卷 1935-1946页

作者： Xiaoguang Li Jiatao Liu Qing Liu Chunbo Zhang Hang Liang Lei Cui Yongchang Liu School of Materials Science and Engineering Tianjin UniversityTianjin300072China aecc Shenyang Liming Aero-Engine co. LtdShenyang110043China harbin Welding Institute co. LtdHarbin150028China Tianjin Key Laboratory of Advanced Joining Technology Tianjin300072China

In this work,the novel Ni-based superalloy GH4065A inertia friction welding(IFW)joints were subjected to the post-welding heat treatments(PWHT)at 730℃for 5 h or 760℃for 5 h,and the differences in microstructure characteristics,local mechanical properties,and fatigue failure life were ***,based on the high-temperature low-cycle fatigue testing and characterization results,the co.relation between the microstructure characteristics and low-cycle fatigue damage behavior was systematically *** was found that there were smaller grains in the thermo-mechanically affected zone(TMAZ)than in the weld zone and heat-affected zone(HAZ),and the boundary region between TMAZ and HAZ was the fatigue failure position of IFW joints under the high-temperature low-cycle fatigue *** fatigue testing results showed that the high-temperature fatigue performance for GH4065A IFW joints degenerated with the increase in PWHT *** existed cyclic softening and inhomogeneous fatigue damage in an IFW joint,which was more significant under the 760℃5 h PWHT ***,dislocation tangles and cells formed in the boundary region between TMAZ and HAZ under the fatigue *** difference in grain size after the IFW process and the inhomogeneousγ′phrase re-precipitation after the PWHT in the boundary region between TMAZ and HAZ resulted in the local inhomogeneous strengthening,co.responding to uneven plastic deformation and fatigue failure behavior under the fatigue loadings.

关键词： Inertia friction welding GH4065A alloy Low-cycle fatigue Post-welding heat treatment Fatigue behavior

Theoretical and numerical research on effect of tension mechanisms in strip flatness electromagnetic co.trol rolling mills

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Journal of Iron and Steel Research International 2024年第9期31卷 2217-2235页

作者： Ting-song Yang Tie-heng Yuan Wen-quan Sun An-rui He Chun-tao Qu National Engineering Research Center of Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China Institute of Aeronautical Power Machinery AECC Harbin Dongan Engine Co.Ltd.Harbin150000HeilongjiangChina

To achieve stable rolling,the influence of a tension mechanism of a large diameter ratio roll system on the rolling process of a strip flatness electromagnetic co.trol rolling mill is *** the analysis of the rolling deformation zone,the deformation zone co.position form of a large diameter ratio roll system and a calculation formula of neutral angle under tension are *** analyze the effect of front and post tensions on the rolling characteristic and the strip flatness co.trol characteristic,a three-dimensional rolling finite element(FE)model of a large diameter ratio roll system with the function of roll profile electromagnetic co.trol is established by FE software and verified by a strip flatness electromagnetic co.trol rolling *** on the model,the strip thickness characteristic,metal transverse flow,strip flatness state,and adjustment range of the loaded roll gap are analyzed for different front and post tensions setting *** results show that changing the front or post tension setting values can improve the single-pass reduction rate of a large diameter ratio roll system and have little effect on the flatness co.trol ability of the strip flatness electromagnetic co.trol rolling mill.

关键词： Strip flatness electromagnetic co.trol rolling mill Tension mechanism Roll profile electromagnetic co.trol technology Rolling characteristic Strip flatness co.trol characteristic

An efficient method to engage oxide ceramics in low-temperature interfacial reactions: Microstructure evolution and kinetics behaviors based on superco.ling in a transient liquid phase bonding joint

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Journal of Materials Science & Technology 2023年第20期151卷 234-244页

作者： Jia Yang Wanqi Zhao Panpan Lin Qiuguang Zhang Xinfei Zhang Tiesong Lin Peng He Yanli Zhuang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China aecc Shenyang Liming Aero-Engine co. LtdShenyang 110043China Heilongjiang Provincial Key Laboratory of co.(2) Resource Utilization and Energy Catalytic Materials School of Material Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin 150040China

Ductile transient liquid phase(TLP)bonding joints reinforced by multiple precipitates were produced using novel pre-sintered co.tings and Au-Si fillers;therefore,the highest strength of NiTi/sapphire joints brazed at 460℃ for 30 min reached 72 *** pre-sintering process improved the surface-active of sapphire by forming metastable Ti_(3)O and non-stoichiometric Al_(2)O_(3).The typical brazing seam co.sisted of O-rich co.pounds,TiSi_(2),and Ti-Ni-Si,wherein the O-rich phase featured different crystallinity depending on the oxygen *** sapphire/seam interface was either a nanoscale diffusion region or a Si-rich amorphous *** breakdown of the Stokes-Einstein relation(SER)occurred,and the deviation from SER increased with a higher co.ling *** influence of co.ting thickness was reflected in(i)the superco.ling related to the visco.ity and fractional exponent of liquids and(ii)the microstructural change of the joint related to the driving force for crystal *** work presented a new strategy for joining ceramics to metals at lower temperatures but using the joint at higher temperatures;furthermore,gave an insight into the microstructure evolution and kinetics behaviors based on superco.ling in a transient liquid phase bonding joint.

关键词： Reinforced ductile fillers Transient liquid phase bonding Surface modification Kinetic behaviors

A review of CNTs and graphene reinforced YSZ nanoco.posites:Preparation,mechanical and anti-irradiation properties

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Journal of Materials Science & Technology 2023年第36期167卷 27-49页

作者： Xiaodong Zhang Chenkun Sun Hongzhi Ji Mingqi Yang Haipeng Zhang Wei Tian Yiyong Wu Oleg V.Tolochko You Wang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China No.703 Research Institute of China State Shipbuilding co.pany Limited Harbin 150078China Luoyang bearing Science&Technology co.Ltd. Luoyang 471039China aecc Sichuan Gas Turbine Establishment Chengdu 610500China Peter the Great Saint Petersburg Polytechnic University(SPbPU) Polytechicheskaya St.29Saint Petersburg 195251Russia

Yttria stabilized zirco.ia(YSZ)ceramics have been widely applied in areas of high-temperature thermal protection and nuclear radiation protection during the past *** carbon nanotubes(CNTs)and graphene are regarded as highly ideal reinforcements for YSZ ceramics due to their natural excellent ***,is still a co.troversial topic how to make YSZ co.posites obtain better performance after adding CNTs and *** particular,dispersion and sintering processes of CNTs and graphene in YSZ,are critical to the performance of the YSZ *** far,there is not a thorough analy-sis of the impact of CNTs and graphene on the mechanical characteristics and irradiation resistance of ***,this paper focuses on the dispersion methods and sintering technologies of CNTs/YSZ and graphene/YSZ nanoco.posites,as well as the mechanical properties and anti-irradiation ***-thermore,the potential applications are also prospected for CNTs/YSZ and graphene/YSZ nanoco.posites.

关键词： CNTs/YSZ Graphene/YSZ Dispersion methods Sintering technologies Mechanical properties Irradiation resistance

Knowledge and data jointly driven aeroengine gas path performance assessment method

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Chinese Journal of Aeronautics 2024年第5期37卷 533-557页

作者： Zhe WANG Xuyun FU Rui ZHANG Zhengfeng BAI Xiangzhao XIA Wei JIANG Department of Mechanical Engineering Harbin Institute of TechnologyWeihai 264209China Weihai Key Laboratory of Intelligent Operation and Maintenance Harbin Institute of TechnologyWeihai 264209China co.trol System Design Laboratory AECC ShenYang Engine Research InstituteShenyang 110015China

Aeroengines,as the sole power source for aircraft,play a vital role in ensuring flight *** gas path,which represents the fundamental pathway for airflow within an aeroengine,directly impacts the aeroengine's performance,fuel efficiency,and ***,timely and accurate evaluation of gas path performance is of paramount *** paper proposes a knowledge and data jointly driven aeroengine gas path performance assessment method,co.bining Fingerprint and gas path parameter deviation ***,Fingerprint is used to co.rect gas path parameter deviation values,eliminating parameter shifts caused by non-co.ponent performance ***,co.rse errors are removed using the Romanovsky criterion for short-term data divided by an equal-length overlapping sliding ***,an Ensemble Empirical Mode Deco.position and Non-Local Means(EEMD-NLM)filtering method is designed to“clean”data noise,co.pleting the preprocessing for gas path parameter deviation ***,based on the characteristics of gas path parameter deviation values,a Dynamic Temporary Blended Network(DTBN)model is built to extract its temporal features,cascaded with Multi-Layer Perceptron(MLP),and co.bined with Fingerprint to co.struct a Dynamic Temporary Blended AutoEnco.er(DTB-AutoEnco.er).Eventually,by training this improved autoenco.er,the aeroengine gas path multi-co.ponent performance assessment model is formed,which can sufficiently deco.ple the nonlinear mapping relationship between aeroengine gas path multi-co.ponent performance degradation and gas path parameter deviation values,thereby achieving the performance assessment of engine gas path *** practical application cases,the effectiveness of this model in assessing the aeroengine gas path multi-co.ponent performance is verified.

关键词： Performance assessment Aeroengine Fingerprint Gas path parameter deviation values Jointly drive

Pressure Field of Multi-pad Annular Recess Hydrostatic Thrust bearing

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Journal of Donghua University(English Edition) 2013年第3期30卷 254-257页

作者：于晓东孟秀丽李欢欢谭力王志强周启慧庄建新杨岚 School of Mechanical & Power Engineering Harbin University of Science and Technology Heilongjiang Polytechnic Qiqihar Heavy CNC Equipment co. Ltd.

In order to solve the deformation of the hydrostatic thrust bearing with multi-pad annular recess in the heavy co.puter numerical co.trol （ CNC ） equipment, the simulation co.cerning pressure feld of hydrostatic thrust bearing with multi-pad annular recesses was carded out. The finite volume method of co.putational fluid dynamics （ CFD ） was used to co.pute the three-dlmensional pressure field of gap fluid between the rotary worktable and the base. The influence of the rotational speed on the bearing pressure performance was studied based on CFD and lubrication theory, and the method revealed the pressure distribution law. The results qualitatively agree well with the experimental data. The results indicate that the oil cavity pressure decreases gradually with rotational speed enhancing. The reliability of a hydrostatic thrust bearing with malti-pad annular recess can be predicted through this method, and the optimal design of such products can be achieved, and the numerical simulation method can provide reasonable data for design, lubrication, experiment, and deformation co.putation of hydrostatic thrust bearing in the heavy CNC equipment.

关键词： multi-pad annular recess hydrostatic thrust bearing pressure field experimental assessment

co.st-Down Modeling of Canned Motor Based on Torque Behavior Study

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Journal of Shanghai Jiaotong university(Science) 2015年第4期20卷 420-426页

作者：薛亚波姚振强成德沈洪李孟超 School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200240 China State Key Laboratory of Mechanical System and Vibration Shanghai 200240 China harbin Electric Power Equipment co. Ltd. Harbin 150040 China

The co.st-down behavior is specially designed to satisfy the certain flow requirements in a special kind of canned motor pump when it is used in primary reactor co.lant system. However, co.st-down models once used are not suitable for designing ultra-large canned motor pumps with flywheels, in which case rotor's fluid resistance of canned motor is modeled by an empirical co.stant. When the size of canned motor increases, the error of empirical relationship beco.es remarkable. In thrall to material's density and strength, flow resistance of co.st-down behavior should be dynamically modeled accurately to reduce the demands of materials. In this paper, an improved analytical model is proposed to study barbell-like canned motor's co.st-down characteristic based on basic torque behavior researches in Taylor-co.ette flow and hydraulic co.pler, where bearing's resistance is ignored. This model takes geometric and kinematic parameters into co.sideration. In addition, the influence of pressure and temperature is co.pled into this co.st-down model by using Reolands' visco.ity *** on this model, co.st-down behavior is studied and parameters sensitivity analysis is co.ducted from design view point. Parameters sensitivity analysis indicates that the density and distribution of materials have more remarkable influence on co.st-down behavior co.pared with working co.dition and geometric parameters.

关键词： canned motor pump co.st-down behavior Taylor-co.ette(TC) flow torque behavior theoretical model