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Synergistic effects of multiscale TiC and dual-phase structure on tensile properties of particle-reinforced steel

Journal of Iron and Steel Research(International) 2024年第5期31卷 1232-1245页

作者： Ye Jia Xiang-tao Deng Qi Wang Cheng-ru Li Hao Wu Zhao-dong Wang state key laboratory of rolling and automation Northeastern UniversityShenyang110819LiaoningChina

The conventional melting methods were used to obtain in situ TiC particle-reinforced dual-phase steel,followed by hot rolling and heat treatment processes.The aim was to investigate the effect of TiC particles on the fracture behavior of dual-phase steel at different annealing temperatures,by analyzing the microstructure and tensile behavior of the multiscale TiC particle-reinforced dual-phase steel.The results showed that TiC particles precipitated in the as-cast microstructure of dual-phase steel were distributed along the grain boundaries.During hot rolling,the grain boundary-like morphology of the micron-sized TiC particles was disrupted,and the particles became more refined and evenly distributed in the matrix.The tensile tests revealed that the strength of the TiC particle-reinforced dual-phase steel increased with increasing martensite content,while the elongation decreased.These results were similar to those of conventional steel.The addition of 1 vol.%multiscale TiC particles improved the strength of the dual-phase steel but did not affect elongation of the steel.Cracks and holes were primarily concentrated around the TiC particles rather than at the interface of martensite and ferrite.The main causes of crack sprouting were TiC particle interface cracking and TiC particle internal fragmentation.Overall,the study demonstrated the potential of multiscale TiC particle-reinforced dual-phase steel as a strong and tough material.The refined distribution of TiC particles in the matrix improved the strength of the material without compromising its elongation.The results also highlighted the importance of careful selection of reinforcement particles to avoid detrimental effects on the fracture behavior of the material.

关键词： TiC particle Dual-phase structure TiC-reinforced dual-phase steel Tension Fracture behavior

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Mechanism of local solidification time variations with melt rate during vacuum arc remelting process of 8Cr4Mo4V high-strength steel

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Journal of Iron and Steel Research(International) 2024年第2期31卷 377-388页

作者： Tao Pan Hong-chun Zhu Zhou-hua Jiang Hua-bing Li Rui Zhang Hao Feng School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina state key laboratory of rolling and automation Northeastern UniversityShenyang110819LiaoningChina

A 2D axisymmetric numerical model was established to investigate the variations of molten pool with different melt rates during the vacuum arc remelting of 8Cr4Mo4V high-strength steel,and the ingot growth was simulated by dynamic mesh techniques.The results show that as the ingot grows,the molten pool profile changes from shallow and flat to V-shaped,and both the molten pool depth and the mushy width increase.Meanwhile,the variation of both the molten pool shape and the mushy width melt rate is clarified by the thermal equilibrium analysis.As melt rate increases,both the molten pool depth and the mushy width increase.It is caused by the increment in sensible heat stored in the ingot due to the limitation of the cooling capacity of the mold.The nonlinear increment in sensible heat leads to a nonlinear increase in the mushy width.In addition,as melt rate increases,the local solidification time(LST)of ingot decreases obviously at first and then increases.When melt rate is controlled in a suitable range,LST is the lowest and the secondary dendrite arm spacing of the ingot is the smallest,which can effectively improve the compactness degree of 8Cr4Mo4V high-strength steel.

关键词： 8Cr4Mo4V high-strength steel Vacuum arc remelting process Melt rate Molten pool Local solidification time

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Effect of Ti-enriched Carbonitride on Microstructure and Mechanical Properties of X80 Pipeline Steel

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Journal of Materials Science & Technology 2010年第9期26卷 803-809页

作者： Wei Deng,Xiuhua Gao,Dewen Zhao,Linxiu Du,Di Wu and Guodong Wang state key laboratory of rolling and automation,Northeastern University,Shenyang 110819,China state key laboratory of rolling and automation Northeastern University Shenyang 110819 China

In this study,two API X80 pipeline steels were fabricated by varying Ti additions,and their microstructures and fracture characteristics were analyzed to investigate the effects of Ti-enriched carbonitride on the tensile properties and Charpy impact properties.Lathy bainite,a mass of matensite/austenite（M/A）,coarse cubic Ti-enriched inclusions,chain-typed Ti-enriched precipitations,weak toughness and high tensile strength were found as consequences of higher amount of Ti content.Those large scale and chain-typed Ti-enriched carbonitrides are one kind of crack sources during fracture.The negative effect of higher amount of Ti on the impact properties is increased with decreased temperature.

关键词： X80 pipeline steel Ti-enriched carbonitride Matensite/austenite（M/A） constitute Impact toughness

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Effect of TMCP Parameters on the Microstructure and Properties of Q460qNH Steel

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Journal of Wuhan University of Technology(Materials Science) 2009年第6期24卷 917-921页

作者：王磊高彩茹 state key laboratory of rolling and automation Northeastern University

The effects of TMCP parameters, consisting of finish cooling temperature and start rolling temperature in non-recrystallization region, on the final microstructure and mechanical properties of Q460 qNH steel were studied by tensile, Charpy impact tests and optical microscopy. The TMCP parameters for Q460 qNH steel were optimized by laboratory experiments. The results show that the yield strength and tensile strength increase with the finish cooling temperature, and the microstructure of Q460 qNH steel consists of ferrite and granular bainite.

关键词： TMCP mechanical properties M/A constituent Q460 qNH steel

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Controllable nucleation and deformation of skyrmions on surface of magnetic nanotubular monolayer

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Rare Metals 2024年第7期43卷 3250-3259页

作者： Xin-Xin Zhang Chen-Yu Zhang Yi-Xin Xing Chao Man Jiao Liu Yong Hu Department of Physics College of SciencesNortheastern University School of Materials and Mineral Resources Engineering Universiti Sains MalaysiaEngineering Campus state key laboratory of rolling and automation Northeastern University

Magnetic skyrmions emerge when the energy of ferromagnetic exchange interaction promoting parallel alignment of spins enters in competition with energies favoring non-collinear alignment of spins such as Dzy aloshinskii-Moriya interaction(DMI),long-rang dipole-dipole interaction(DDI),or higher-order exchange interactions.We perform an unbiased Monte Carlo simulation to study the DMI-based skyrmion nucleation and stabilization on the surface of magnetic nanotubular monolayer controlled by tuning constants of DDI(g) and next-nearest-neighbor antiferromagnetic exchange interaction(j') with appropriate balance.Without g and j',the loosely distributed skyrmions initially nucleate on the surface of nanotube approaching to the magnetic field(h) direction with increasing h in the intermediate range.Then,the skyrmion size,shape,density,distribution and crystal structure,as well as its driven field range,are tailored by g and j'.This work demonstrates the skyrmion nucleation mechanisms in three-dimensional magnetic nanostructures with curvature effect and multiple interactions,serving as a benchmark for a guide to experimentalists for preparation of samples in magnetic skyrmion states.

关键词： Magnetic nanotube Magnetic skyrmion Dzyaloshinskii–Moriya interaction Dipole–dipole interaction Monte Carlo simulation

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ANALYSIS OF SLAB EDGING BY A 3-D RIGID VISCO-PLASTIC FINITE ELEMENT METHOD

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Chinese Journal of Mechanical Engineering 2002年第1期15卷 48-52页

作者： Zhang Xiaoming Jiang Zhengyi Liu Xianghua Wang Guodong state key laboratory of rolling Technology and automation，Northeastern University， Shenyang 110006，China Northeastern University State Key Laboratory of Rolling Technology and Automation Shenyang 110006

3-D rigid visco-plastic finite element method (FEM) is used in the analysisof metal forming processes, including strip and plate rolling, shape rolling, slab edging, specialstrip rolling. The shifted incomplete Cholesky decomposition of the stiffness matrix with thesolution of the equations for velocity increment by the conjugate gradient method is combined. Thistechnique, termed the shifted ICCG method, is then employed to solve the slab edging problem. Theperformance of this algorithm in terms of the number of iterations, friction variation, shiftedparameter psi and the results of simulation for processing parameters are analysed. Numerical testsand application of this technique verify the efficiency and stability of the shifted ICCG method inthe analysis of slab edging.

关键词： 3-D rigid visco-plastic FEM Shifted ICCG method Slab edging Frictionvariation

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Mechanical properties and interfacial characteristics of 6061 Al alloy plates fabricated by hot-roll bonding

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1890-1899页

作者： Zongan Luo Xin Zhang Zhaosong Liu Hongyu Zhou Mingkun Wang Guangming Xie state key laboratory of rolling and automation Northeastern UniversityShenyang 110819China

This work aims to investigate the mechanical properties and interfacial characteristics of 6061 Al alloy plates fabricated by hotroll bonding(HRB)based on friction stir welding.The results showed that ultimate tensile strength and total elongation of the hot-rolled and aged joints increased with the packaging vacuum,and the tensile specimens fractured at the matrix after exceeding 1 Pa.Non-equilibrium grain boundaries were formed at the hot-rolled interface,and a large amount of Mg_(2)Si particles were linearly precipitated along the interfacial grain boundaries(IGBs).During subsequent heat treatment,Mg_(2)Si particles dissolved back into the matrix,and Al_(2)O_(3) film remaining at the interface eventually evolved into MgO.In addition,the local IGBs underwent staged elimination during HRB,which facilitated the interface healing due to the fusion of grains at the interface.This process was achieved by the dissociation,emission,and annihilation of dislocations on the IGBs.

关键词： 6061 Al alloy hot-roll bonding vacuum mechanical properties interfacial grain boundaries

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rolling With Simplified Stream Function Velocity and Strain Rate Vector Inner Product

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Journal of Iron and Steel Research(International) 2012年第3期19卷 20-24页

作者： ZHAO De-wen, ZHANG Shun-hu, LI Can-ming, SONG Hong-yu, WANG Guo-dong (state key laboratory of rolling and automation, Northeastern University, Shenyang 110819, Liaoning, China) state key laboratory of rolling and automation Northeastern University Shenyang Liaoning China

The dual-stream function velocity field is reduced in order to analyze two-dimensional plate broadside roll- ing in roughing. The strain rate vector inner product and integral mean value theorem, as well as coqine vector inner product are used respectively in plastic deformation power, friction losses and shear power. A theoretical solution of roll torque and separating force for the rolling is obtained and the calculated results by the solution are compared with those measured in broadside rolling on-line. It shows that both the force and torque calculated are higher than those of measured, but the maximum relative error between them is no more than 11%.

关键词： broadside roiling roll separating force strain rate vector inner product analytical solution

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Emergence of machine language: towards symbolic intelligence with neural networks

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National Science Review 2024年第4期11卷 27-30页

作者： Yuqi Wang Xu-Yao Zhang Cheng-Lin Liu Tieniu Tan Zhaoxiang Zhang state key laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of Sciences

Representation learning is a core issue in artificial intelligence (AI). Currently,there exists a disparity in the choice of representation between humans and machines. Humans rely on discrete language for communicati...

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Mathematical model for cooling process and its self-learning applied in hot rolling mill

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Journal of Shanghai University(English Edition) 2011年第6期15卷 548-552页

作者：刘伟嵬李海军王昭东王国栋 state key laboratory of rolling and automation Northeastern University

Control precision of coiling temperature is one of the key factors affecting the profile shape and surface quality during the cooling process of hot rolled steel strip.For this reason,the core of temperature control precision is to establish an effective cooling mathematical model with self-learning function.Starting from this point,a cooling mathematical model with nonlinear structural characteristics is established in this paper for the cooling process of hot rolled steel strip.By the analysis of self-learning ability,key parameters of the mathematical model could be constantly corrected so as to improve temperature control precision and adaptive capability of the model.The site actual application results proved the stable performance and high control precision of the proposed mathematical model,which would lay a solid foundation to improve the steel product qualities.

关键词： cooling process model coiling temperature self-learning hot rolled steel strip

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