检索结果-南通市图书馆

Influence of carbon addition on mechanical properties of Fe-Mn-C twinning-induced plasticity steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第9期29卷 1446-1454页

作者： Peng Fu Zhi-bing Zheng Wei-ping Yang hao-kun Yang School of Engineering Jiangxi Agricultural UniversityNanchang 330045JiangxiChina Institute of New Materials GuangdongAcademy of SciencesGuangdong Provincial iron Matrix Composite Engineering Research CenterGuangzhou 510650GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077.China

Mechanical properties and microstructural evolution of Fe-22Mn-0.6C and Fe-22Mn-1.0C(wt.%)twinning-induced plasticity(TwIP)steels were investigated by monotonic,stress-relaxation and unloading-reloading tensile *** dynamic strain aging(DSA)effect,resulting from pinning of dislocations,effectively improved the dislocation activation volume of the two TWIP *** the meanwhile,DSA-facilitated twinning nucleation mechanism kept similar twinning capabilities of the two TWIP *** strain increasing,the formation of high-density deformation twins restricted the dislocation motion and reduced the activation volume with increasing ***,C addition simultaneously improved the ultimate tensile strength and uniform elongation,and significantly enhanced the friction stress,rather than back *** stronger short-range order effect,brought by friction stress,promotes the planar dislocation slipping,thus improving the work-hardening *** a result,the additional work-hardening capacity can be achieved in Fe-Mn-C with higher C addition.

关键词： Twinning induced plasticity steel Work-hardening rate Dynamic strain aging Short-range order Deformation twin

Dynamical Analysis of Nonautonomous Trophic Cascade Chemostat Model with Regime Switching and Nonlinear Perturbations in a Polluted Environment

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 Mathematicae Applicatae Sinica 2023年第3期39卷 550-570页

作者： Ya-jie LI hao-kun QI Zheng-bo CHANG Xin-zhu MENG College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China Weifang Commercial College of Shandong Weifang 261011China College of Mathematics and Information Science Anshan Normal UniversityAnshan 114007China

This paper investigates the stochastic dynamics of trophic cascade chemostat model perturbed by regime switching, Gaussian white noise and impulsive toxicant input. For the system with only white noise interference, sufficient conditions for stochastically ultimate boundedness and stochastically permanence are obtained, and we demonstrate that the stochastic system has at least one nontrivial positive periodic solution. For the system with Markov regime switching, sufficient conditions for extinction of the microorganisms are established. Then we prove the system is ergodic and has a stationary distribution. The results show that both impulsive toxins input and stochastic noise have great effects on the survival and extinction of the microorganisms. Finally, a series of numerical simulations are presented to illustrate the theoretical analysis.

关键词： stochastic trophic cascade chemostat model Markov chain extinction and stochastic permanence periodic solution ergodicity

Mechanical properties and fracture mechanism of Fe/Cu composite sheets with Al interlayer after annealing treatment

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9期30卷 1888-1895页

作者： Xiao-wei Feng Jia-xin Li Zhi-bin Zheng Bo Feng hao-kun Yang Institute of New Materials Guangdong Academy of SciencesGuangdong Provincial Key Laboratory of Metal Toughening Technology and ApplicationGuangzhou 510000GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077China

The feasibility of preparing Fe/Cu composite sheet was achieved by introducing submillimeter thickness Al sheet as an interlayer by rolling at room *** shear test of the composite sheet supported that the metallurgical bonding strength between Fe/(Al)/Cu interface was stronger than that of Cu sheet at the initial *** further 300 or 600℃ annealing treatments,the interlayer subsequently exhibited brittle shear fracture,and the shear strength significantly dropped under the shear ***,the tensile test pointed out that the tensile fracture mechanism changed from fracture as a whole structure to interlayer-to-layer delamination mode after annealing *** microstructure and X-ray diffraction observations proved that the formation of Cu–Al intermetallic compounds(IMCs)along the interlayer resulted in brittle fracture,rather than that of Fe–Al IMCs after annealing,especially under 600℃ annealing *** investigation of the effect of the rolling process and annealing treatment on the mechanical properties of the Fe/(Al)/Cu composite sheet shall provide instruction for high-quality composite metallic sheet fabrication.

关键词： Composite sheet Fe/Cu Interlayer Intermetallic compound Fracture

Recent progress in microstructural evolution,mechanical and corrosion properties of medium-Mn steel

在线全文

维普期刊数据库

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 1463-1476页

作者： Yan-xin Qiao Zhi-bin Zheng hao-kun Yang Jun Long Pei-xian Han School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100JiangsuChina Institute of New Materials National Engineering Research Center of Powder Metallurgy of Titanium and Rare MetalsGuangdong Provincial Key Laboratory of Metal Toughening Technology and ApplicationGuangdong Academy of SciencesGuangzhou 510650GuangdongChina Smart Manufacturing Division(SMD) Hong Kong Productivity CouncilHong Kong 999077China Jiangxi Lianfeng Investment Casting Co. Ltd.Yichun 336300JiangxiChina

Medium-manganese(Mn)steel(MMS)has remarkable characteristics of high strength,strong work-hardening capacity,and wear resistance,being a promising third-generation advanced high-strength steel with lower raw material cost compared with other generations of advanced high-strength *** chemical composition and processing route play critical roles in determining the microstructural evolution of the MMS,and the microstructure composition significantly influences the mechanical,corrosion and wear properties of the ***,a lot of research work focus on exploring the direct relation between microstructural evolution and mechanical/corrosion/wear properties,and the progress has the following crucial aspects:(1)alloying design on the phase composition and carbide precipitation,(2)processing route on regulating microstructure evolution and twinning-induced plasticity and/or transformation-induced plasticity strengthening mechanism,(3)work-hardening,corrosion,and corrosion resistance of the regulated MMS,and(4)fracture and failure mechanism of MMS under tensile,corrosion and wear damages,as well as the improvement strategies.

关键词： Medium-Mn steel Microstructure Mechanical property Corrosion property Alloying design Processing route Fracture mechanism

Refill friction stir spot welding (RFSSW): a review of processing, similar/dissimilar materials joining, mechanical properties and fracture mechanism

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第8期31卷 1825-1839页

作者： Yun-qiang Zhao hao-kun Yang Aloshyn Andriia Hong-hang Lo Jia-xin Li Guangdong Provincial Key Laboratory of Advanced Welding Technology China-Ukraine Institute of WeldingGuangdong Academy of SciencesGuangzhou 510000GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077China E.O.Paton Electric Welding Institute of National Academy of Sciences of Ukraine Kiev 01001KievanUkraine

Refill friction stir spot welding(RFSSW)provides a novel method to join similar and/or dissimilar metallic materials without a key-hole in the center of the *** the key-hole free characterization,the similar/dissimilar RFSSW joint exhibits remarkable and endurable characteristics,including high shear strength,long fatigue life,and strong corrosion *** the meanwhile,as the key-hole free joint has different microstructures compared with conventional friction stir spot welding,thus the RFSSW joint shall possess different shear and fatigue fracture mechanisms,which needs further *** explore the underlying failure mechanism,the similar/dissimilar metallic material joining parameters and pre-treatment,mechanical properties,as well as fracture mechanisms under this novel technology will be *** details,the welding tool design,welding parameters setting,and the influence of processing on the lap shear and fatigue properties,as well as the corrosion resistance will be mainly ***,the roadmap of RFFSW is also discussed.

关键词： Refill friction stir spot welding Processing Mechanism Similar materials joining Dissimilar materials joining Microstructure Mechanical property Fracture mechanism

Effects of initial soil moisture content on soil water and nitrogen transport under muddy water film hole infiltration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2021年第4期14卷 182-189页

作者： Lihua Liu Liangjun Fei Lin Chen kun hao Quanju Zhang State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi’an University of TechnologyXi’an 710048China Institute of Water Resources and Hydro-electric Engineering Xi’an University of TechnologyXi’an 710048China

Film hole irrigation has been widely adopted as an effective water-saving irrigation technology in the arid and semiarid areas of *** investigate the effects of initial soil moisture content(θ0)on soil water and nitrogen transport characteristics under muddy water film hole infiltration,the laboratory experiments were conducted with muddy water film hole infiltration,using five initial soil moisture content *** models for describing the relationships between the cumulative infiltration(I(t))and infiltration duration(t);the relationship among the horizontal and vertical migration distances of the wetting front(Fx,Fz),θ0 and t,were *** results showed that the initial soil moisture content had a significant effect on I(t),Fx,Fz and moisture content distribution in the wetted *** change of I(t)over t conformed to Kostiakov *** the increase ofθ0,the infiltration coefficient(K)gradually ***-3-N was mainly distributed in the range of the wetting radius of 15 cm,while NH+4-N was mainly distributed in the range of the wetting radius of 8 *** study can provide a theoretical basis and technical support for film hole irrigation.

关键词： film hole irrigation muddy water initial soil moisture content water and nitrogen transport water redistribution

An investigation of cavitation control using a porous material on a hemispherical cylinder at various cavitation numbers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2024年第5期36卷 870-882页

作者： Fei-peng Yu Yi-gan Zhang hao-kun Li Ze-hui Qu Hua-ping Liu School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan430074China

In this paper,a passive control method based on a porous material is applied to the surface of a hemispherical cylinder to control a cavitating flow,and the control effect of this method at different cavitation numbers(σ)is evaluated through the cavity morphology and volume,which is important for the application in *** results indicate that the control effect is improved with a reduction in the cavitation number,for the reduction of vapor volume increases from 22%–50%withσdecreasing from 0.50–*** investigation indicates that the cavity inception at different cavitation numbers is still induced by the Kelvin-Helmholtz instability,while the spatial distribution of the vapor changes ***,the porous material suppresses the cavitating flow in the front region but enhances it downstream at large cavitation ***σ=0.20,the cavitating flow is controlled in both the front and rear regions.

关键词： Cavitation control porous material Kelvin-Helmholtz instability spatial distribution

Thermodynamic limit of the XXZ central spin model with an arbitrary central magnetic field

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 2023年第9期32卷 177-183页

作者：温发楷郝昆 College of Physics and Electronic Information Yunnan Normal UniversityKunming 650500China Yunnan Key Laboratory of Opto-Electronic Information Technology Kunming 650500China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China Institute of Modern Physics Northwest UniversityXi'an 710127China Peng Huanwu Center for Fundamental Theory Xi'an 710127China Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi'an 710127China

The U(1)symmetry of the X X Z central spin model with an arbitrary central magnetic field B is broken,since its total spin in the z-direction is not *** obtain the exact solutions of the system by using the off-diagonal Bethe ansatz *** thermodynamic limit is investigated based on the *** find that the contribution of the inhomogeneous term in the associated T-Q relation to the ground state energy satisfies an N^(-1)scaling law,where N is the total number of *** result makes it possible to investigate the properties of the system in the thermodynamic *** assuming the structural form of the Bethe roots in the thermodynamic limit,we obtain the contribution of the direction of B to the ground state *** is shown that the contribution of the direction of the central magnetic field is a finite value in the thermodynamic *** is the phenomenon caused by the U(1)symmetry breaking of the system.

关键词： integrable spin chain Bethe ansatz T-Q relation central spin model thermodynamic limit

Lax pair formulation for the open boundary Osp(1|2)spin chain

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第11期74卷 65-76页

作者： Xiaoyu Zhang kun hao Institute of Modern Physics Northwest UniversityXi'an 710127China Peng Huanwu Center for Fundamental Theory Xi'an 710127China

Based on the Lax pair formulation,we study the integrable conditions of the Osp(1|2)spin chain with open *** consider both the non-graded and graded versions of the Osp(1|2)*** Lax pair operators M_(±)for the boundaries can be induced by the Lax operator M_(j)for the bulk of the *** correspond to the reflection equations(RE)and the Yang-Baxter equation,*** further calculate the boundary K-matrices for both the non-graded and graded versions of the model with open *** double row monodromy matrix and transfer matrix of the spin chain have also been *** K-matrices obtained from the Lax pair formulation are consistent with those from Sklyanin’s *** construction is another way to prove the quantum integrability of the Osp(1|2)*** find that the Lax pair formulation has advantages in dealing with the boundary terms of the supersymmetric model.

关键词： Bethe Ansatz lattice integrable models quantum spin chain supersymmetry algebra