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Microstructure and Abrasive Wear Behavior of Medium Carbon Low Alloy Martensitic Abrasion Resistant Steel

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Journal of Iron and Steel Research International 2014年第1期21卷 98-103页

作者： Xiang-tao DENG zhao-dong wang Yi HAN Hui zhao Guo-dong wang State Key Laboratory of Rolling and Automation Northeastern University Yangxi Harbor Electric Power Development Co. Ltd.

The effect of processing parameters such as hot rolling and heat treatment on microstructure and mechanical properties was investigated for a new 0.27mass% C and Ni, Mo-free low alloy martensitic abrasion resistant steel. The three-body impact abrasive wear behavior was also analyzed. The results showed that two-step controlled rolling besides quenching at 880 ℃ and tempering at 170 ℃ could result in optimal mechanical property., the Brinell hardness, tensile strength, elongation and --40 ℃ impact toughness were 531, 1530 MPa, 11.8% and 58 J, re- spectively. The microstructure was of fine lath martensite with little retained austenite. Three-body impact abrasive wear results showed that wear mechanism was mainly of plastic deformation fatigue when the impact energy was 2 J, and the relative wear resistance was 1.04 times higher than that of the same grade compared steel under the same working condition. The optimal hardness and toughness match was the main reason of higher wear resistance.

关键词： abrasion resistant steel processing parameter mechanical property relative wear resistance

Solidification microstructure of Ti-43Al alloy by twin-roll strip casting

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China Foundry 2023年第2期20卷 99-107页

作者： Yang Chen Guo-huai Liu Ye wang zhao-dong wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China College of Material Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150080China

As a near-net-shape technology,the twin-roll strip casting(TRC)process can be considered to apply to the fabrication of TiAl alloy ***,the control of the grain distribution is very important in strip casting because the mechanical properties of strips are directly determined by the solidification microstructure.A three-dimensional(3D)cellular automation finite-element(CAFE)model based on ProCAST software was established to simulate the solidification microstructure of Ti-43Al ***,the influence of casting temperature and the maximum nucleation density(nmax)on the solidification microstructure was investigated in *** simulation results provide a good explanation and prediction for the solidification microstructure in the molten pool before leaving the kissing *** and simulated microstructure show the common textureorientation in the columnar grains ***,the microstructure evolution of the Ti-43Al alloy was analyzed and the solidification phase transformation path during the TSC process was determined,i.e.,L→L+β→β→β+α→α+γ+β/B2 phase under a faster cooling rate and L→L+β→β→β+α→γ+lamellar(α_(2)+γ)+β/B2 phase under a slower cooling rate.

关键词： TiAl alloy simulation microstructure strip casting solidification

Analysis of Rolling Pressure in Asymmetrical Rolling Process by Slab Method

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Journal of Iron and Steel Research International 2009年第4期16卷 22-26,38页

作者： TIAN Yong GUO Yan-hui wang zhao-dong wang Guo-dong State Key Laboratory of Rolling and Automation Laboratory Northeastern University Shenyang 110004 Liaoning China

The plane strain asymmetrical rolling was analyzed using slab method. The contact arc was replaced by parabola, and the constant surface friction status was adopted during the analysis. The deformation area was divided into three zones according to the direction of the friction. Then, the three zones were studied, respectively. A rolling force model and a rolling torque model were developed based on the analysis, and they were used to analyze the influ- ence of asymmetrical rolling factors on deformation area and unit pressure if they had good precision which was determined by comparing the calculated results with the measured ones.

关键词： asymmetrical rolling slab method asymmetrical factor specific pressure distribution

Broadband Source Ranging in Shallow Water Using the Ω-Interference Spectrum

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Chinese Physics Letters 2010年第6期27卷 110-113页

作者： zhao Zhen-dong wang Ning GAO Da-Zhi wang Hao-Zhong College of Information Science and Engineering Ocean University of China Qingdao 266100

The concept of the waveguide invariant is revisited and a simple relationship between the range of source and the quasi-period of the acoustic interference spectrum in the frequency domain （Ω-interference spectrum） is derived. Then a method for a broadband source ranging in shallow water using a single receiver and a broadband guide source, requiring no modeling and no knowledge about the ocean environment, is proposed. The method is validated by simulation and verified with the experimental data.

关键词： Methods Broadband Source Ranging Ω-Interference Spectrum

A simple calculation model for thermodynamic equilibrium information between precipitation and matrix

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Journal of Iron and Steel Research International 2018年第11期25卷 1156-1162页

作者： Yong Yang Tian-rui Li Tao Jia zhao-dong wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

A simple theoretical model was developed to predict equilibrium between precipitate and matrix in a multicomponent microalloyed *** solute concentration in the matrix,the composition and the volume fraction of the precipitated second phases,and the reduction in critical precipitation temperature of AlN induced by carbonitride were quantified by the proposed thermodynamic *** results predicted by the developed model and those by other approaches are in a good *** main advantages of this model over the existing models are that the process of formulation derivation is simple and the model can be easily solved by a personal program.

关键词： AlN precipitation Carbonitride Thermodynamic model Phase equilibrium

Precipitation kinetics of complex precipitate in multicomponent systems

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Journal of Iron and Steel Research International 2018年第10期25卷 1086-1093页

作者： Yong Yang Tian-rui Li Tao Jia zhao-dong wang State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 Liaoning China

A kinetic model based on the classical nucleation and growth theory has been proposed to predict the precipitation behavior of complex precipitate. The method for calculating absolute solution temperature, which is an important guidance for determining solution treatment temperature, is also proposed based on thermodynamic model. In the model, nucleation of the second phase is assumed to be controlled by the effective diffusion, which involves the bulk diffusion and dislocation pipe diffusion, and growth is controlled by the bulk diffusion of forming elements. The interfacial energy of complex precipitate is calculated by the linear interpolation method, and the effects of alloying elements on precipitation behavior are manifested using weighted means of their diffusivities and concentration. The predictions were compared with the experimental measurements, and a good agreement was obtained.

关键词： Complex precipitate Carbide Kinetic model Nucleation and growth theory Absolute solution temperature

Texture evolution and mechanical properties of Al-Mg-Si alloys at different intermediate annealing temperatures

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Rare Metals 2019年第10期38卷 937-945页

作者： Yong Li Qi-Pan wang Guan-Jun Gao Jia-dong Li zhao-dong wang Guang-Ming Xu State Key Laboratory of Rolling and Automation Northeastern University

Intermediate annealing treatment produces different effects on the state of particles in Al-Mg-Si alloy sheets,thereby affecting their recrystallization textures and *** improve the formability of the sheets,the effects of different intermediate annealing temperatures on the texture evolution and mechanical properties of these sheets for automotive applications were studied using optical microscope(OM),scanning electron microscope(SEM) and tensile *** results reveal that intermediate annealing temperature has a significant influence on the recrystallization textures and average plastic strain ratio(r).After solution treatment,all the alloy sheets possess similar recrystallization texture components comprising of cubeND {100} and P {011} orientations,whereas a characteristic strong cube-oriented {100} texture is observed only in the alloy annealed at a temperature of 380℃.However,in comparison with the alloy not annealed,and the alloy annealed at 550℃,the alloy annealed at 380℃ possesses a lower average r ***,the relationship between textures and r value was analyzed by using the Taylor full constraints model in this study.

关键词： Al-Mg-Si alloys Intermediate annealing Texture evolution Mechanical property

An On-line Finite Element Temperature Field Model for Plate Ultra Fast Cooling Process

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Journal of Iron and Steel Research International 2014年第5期21卷 481-487页

作者： Xiao-lin CHEN Guo-dong wang Yong TIAN Bing-xing wang Guo YUAN zhao-dong wang State Key Laboratory of Rolling and Automation Northeastern University

Taking the element specific-heat interpolation function into account, a one-dimensional （l-D） finite ele- ment temperature field model for the on-line control of the ultra fast cooling process was developed based on the heat transfer theory. This 1-D model was successfully implemented in one 4 300 mm plate production line. To improve the calculation accuracy of this model, the temperature-dependent material properties inside an element were considered during the modeling process. Furthermore, in order to satisfy the real-time requirements of the on-line model, the variable bandwidth storage method and the Cholesky decomposition method were used in the programming to storage the data and carry out the numerical solution. The on-line application of the proposed model indicated that the devia- tion between the calculated cooling stop temperature and the measured one was less than ± 15 ℃.

关键词： laminar cooling ultra fast cooling temperature field finite element variable bandwidth storage meth-od Cholesky decomposition method

Microstructural Evolution and Properties of a High Strength Steel with Different Direct Quenching Processes

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Journal of Iron and Steel Research International 2015年第4期22卷 344-351页

作者： Feng LU Chao wang Long L zhao-dong wang Guo-dong wang Raja Devesh Kumar MISRA State Key Laboratory of Rolling and Automation Northeastern University Department of Metallurgical and Materials Engineering University of Texas at El Paso

A high strength low alloy steel with low carbon equivalent was selected for simulating online direct quench- ing and coiling （DQ-C） process. The influence of stop quenching temperature on mechanical properties and micro- structures was studied and compared with normal direct quenching and tempering （DQ-T） process. The study con- firmed that required mechanical properties were obtained for both the processes. Properties of the experimental steel with DQ-C process could reach the same level as that of DQ-T process in general. In the DQ-C process, strength de- creased with increase in stop quenching temperature. Martensite was obtained and experienced an aging process at stop quenching temperature below Mi. On fast cooling below Mi, martensite was partially transformed and carbon partitioning occurred during slow cooling. The reduction in solid solution carbon and increased amount of retained austenite led to lower strength compared with the DQ-T process. DQ-C process was more favorable for microalloy carbide precipitation. However, impact toughness under different cooling conditions was adequate because of low car- bon equivalent and refined microstructure.

关键词： high strength steel direct quenching slow cooling carbon partitioning precipitation