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Texture Evolution of Columnar Grains in Electrical Steel During hot rolling

Journal of Iron and Steel Research International 2013年第10期20卷 99-106页

作者： SHAO Yuan-yuan YANG Ping FU Yong-jun MAO Wei-min School of Materials Science and Engineering University of Science and Technology Beijing Cold rolling Silicon Steel Division Angang Steel Company Limited

Columnar grains in cast slabs of electrical steel show strong anisotropy in grain orientation and morphology and thus influence the subsequent microstructure and texture after hot rolling significantly. The texture evolution of hot rolled sheets containing initial columnar grains with their 〈100〉 directions approximately parallel to the rolling direction （RD）, transverse direction （TD） and normal direction （ND） of the hot rolled sheets was investigated by using EBSD technique. The results indicated that, whatever the initial texture of the columnar grains was, typical Goss, brass-type and copper-type shear texture component could develop in shear-deformed surface region. The copper-type texture formed under the maximum shearing force with the fine, sheared or dynamically recrystallized grains, and Goss grains were mainly elongated and deformed grains, while brass grains behaved between them. Ad- ditionally, the rotating relationship of the three types of shear textures was different due to the restriction of grain boundaries. In homogenously deformed center region, the RD sample contained more {112}〈110^-〉 grains, and TD sample was covered by {100} textures such as {100}〈011〉 and {100}〈021〉 with coarse grains, while the ND sample developed many {100}〈001〉 grains which were attributed to more {100} grains in the initial sample. Re- markable texture transition occurred on both sides of grain boundaries when {110} grains were adjacent to mfiber texture grains. It was found that significant texture gradient and preferred distribution of rotating axis existed in the soft orientation grains on the α- fiber when the grains neighbored hard grains on γ-fiber.

关键词： electrical steel columnar grain hot rolling texture orientation

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Effect of Deformation between Stands on the Strip Shape in hot rolling

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International Journal of Minerals,Metallurgy and Materials 2000年第3期14卷 222-224页

作者： Qinghai Wu, Jie Zhang, Changsong Wang, Gangcheng Wei, Ping Song, Changhe Deng ( Mechanical Engineering School, University of Science and Technology Beijing, Beijing 100083, China Wuhan Iron & Steel Corporation) Mechanical Engineering School University of Science and Technology Beijing Beijing 100083 China Wuhan Iron and Steel Corporation China

A theoretical model about the secondary deformation is developed by the combination of analytical and experimental approaches. A system simulation based on the model is completed to predict the strip profile after the interstand deformation. On the other hand, comprehensive experiments and quantitative comparisons are made to calibrate the model for a wide variety of products. As a result, the correction of the model has been verified by the actual rolling data from production mill and it is helpful to improve the strip shape control.

关键词： hot rolling strip shape secondary deformation

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Graphitization of Spray-formed Ultrahigh Carbon Steels Containing Si during hot rolling

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Journal of Materials Science & Technology 2005年第2期21卷 161-164页

作者： GuangminLUO dianshengWU JunfeiFAN HaishengSHI YijianLIN JingguoZHANG KeyLab.forHighTemperatureMaterials&TestsofMinistryofEducation ShanghaiJiaoTongUniversityShanghai200030China ShanghaiBaosteelResearchInstitute Shanghai201900China

The graphitization behavior of ultrahigh carbon steels containing Si in hot rolling processes was investigated. The graphite stringers went mostly through the small pores and generally paralleled to the rolling direction. The influence of alloy elements on graphitization was estimated based on thermodynamics, which showed that Si content was important for graphitization. Graphite stringers nucleated at small pores and grew with carbon diffusion during hot rolling. Alloy contents, pores and hot deformation at γ+Fe3C phase range were the key factors for the formation of graphite. The probable effect of deformation on graphite formation during hot rolling was discussed in this paper.

关键词： Graphitization Spray forming Ultrahigh carbon steels hot rolling

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Grain refining and property improvement of AZ31 Mg alloy by hot rolling

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 326-330页

作者： MIAO Qing HU Lian-xi SUN Hong-fei WANG Er-de School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

hot rolling of AZ31 Mg alloy was performed by using as-cast alloy ingot as the starting *** microstructures and mechanical properties of the as-rolled alloy subjected to various rolling passes were *** results show that the grain size of the alloy can be refined steadily with increasing rolling passes by dynamic *** the steady refining of the grain size,both the mechanical strength and the plasticity of the alloy are improved *** particular,when the grain size is reduced to about 5μm after 5 rolling passes,the yield strength,ultimate tensile strength and tensile fracture strain of the alloy are 211 MPa,280 MPa and 0.28 in the transverse direction,they are 200 MPa,268 MPa and 0.32 in the rolling direction,respectively.

关键词： AZ31 Mg alloy hot rolling grain refining mechanical properties

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Effects of hot rolling on microstructure and properties of a 20 vol.% SiC_P/Al composite

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Rare Metals 2005年第1期24卷 95-99页

作者： QUShoujiang GENGLin MENGQingchang FENGAihan LEITingquan SchoolofMaterialScienceandEngineering HarbinInstituteofTechnologyHarbin150001China

A 20 vol. percent SiC_p/Al composite was fabricated by squeeze casting, ofwhich a new process for fabricating the preform was used by blending Al powder and SiC particulateswith average diameters of 10 and 3.5 mu m, respectively. The microstructure of the as-cast and thehot-rolled composite was investigated by using TEM, EDS, and SEM, and their tensile properties weremeasured at room temperature. The results show that the ultimate tensile strength and ultimateelongation of the hot-rolled composite are 80 percent and 140 percent higher than those of theas-cast one. The TEM observation result indicates that there are high density of dislocations anddislocation tangles in the hot-rolled composite. Al_2O_3 layers in the composite resulting from thesurface oxidation of the aluminum powders were damaged to spherical particles during hot *** the results indicate that hot-rolling can improve the mechanical properties of the compositeand, therefore, engineering components of the 20 vol. percent SiC_p/Al composite can be produced bysqueeze casting followed by hot-rolling.

关键词： composite hot rolling squeeze casting silicon carbide particulate

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Effect of Laminar Cooling on Phase Transformation Evolution in hot rolling Process

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Journal of Iron and Steel Research International 2010年第10期17卷 28-32,44页

作者： NING Lin-xin YANG Dai-jun J Lin T A Dean Shougang Technology Institute Shougang Group Beijing 100041 China Department of Mechanical and Manufacturing Engineering University of Birmingham Birmingham B15 2TT UK

The effect of temperature variation owing to the cooling pattern （CP） on the microstructural evolution was investigated by establishing a thermomechanical coupled FE （finite element） model. A set of constitutive equations of phase transformation was implanted into the commercial FE solver MARC through the user defined subroutine CR- PLAW, and the temperature field was calculated by another user defined subroutine FILM. The results show that the final mierostructure is completely bainite phase for CP one, 98% of bainite phase and 2% of ferrite phase for CP two, and 55% of bainite phase, 35% of pearlite phase and 10% of ferrite phase for CP three.

关键词： hot rolling laminar cooling system cooling pattern thermomechanical modelling microstructural evolution constitutive equation phase transformation

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Formation of Edge Crack in 1.4%Si Non-oriented Electrical Steel during hot rolling

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Journal of Iron and Steel Research International 2014年第2期21卷 269-274页

作者： Ai-hua CHEN Hai-rong GUO Hua-long LI Toshihiko EMI Institute of Research of Iron and Steel Shasteel

Microstructure evolution, dynamic recrystallization, high temperature oxidation and hot ductility of 1.4 % Si non-oriented electrical steel sheets were investigated to reduce edge cracking. The causes of cracking were found to be coarse as-cast microstructure, grain boundary oxidation in reheating furnace, lack of dynamic recrystallization during hot rolling and increase of temperature, resulting in reduced hot ductility in strip edge region. Countermeas- ures against the edge crack are proposed accordingly. Lowering reheating temperature and reducing holding time re- duced oxidation and decarburization. hot charging temperature was increased to decrease reheating temperature. And using an edger can refine microstructure in strip edge region. Finally, edge heater can be added to increase edge re- gion formability by inducing dynamic reerystallization and ductility by increasing temperature.

关键词： edge crack non-oriented electrical steel hot rolling

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Analysis of Strip Temperature in hot rolling Process by Finite Element Method

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Journal of Iron and Steel Research International 2010年第2期17卷 17-21页

作者： MEI Rui-bin LI Chang-sheng LIU Xiang hua HAN Bin State Key Laboratory of rolling and Automation Northeastern University Shenyang 110004 Liaoning China Technical Center Wuhan Iron and Steel Group Co Wuhan 430080 Hubei China

The program was developed by finite element method to calculate the temperature distribution in hot strip rolling process. The heat transfer coefficients of air cooling, water cooling and thermal resistance between work roll and strip were analyzed, A new heat generation rate model was proposed according to the influence of source current density, work frequency, air gap and distance to edge on induction heating by finite element method （FEM）. The heat generation rate was considered in the thermal analysis to predict the temperature distribution in the induction heating. The influence of induction heating on the strip temperature was investigated for different slab thicknesses. The temperature difference became more and more obvious with the increase of thickness. The strip could be heated quickly by the induction heating both in surface and center because of the thermal conductivity and skin effect. The heat loss of radiation has important influence on the surface temperature. The surface temperature could be heated quickly by high frequency when the strip is thicker.

关键词： temperature distribution finite element method induction heating skin depth hot rolling

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Slab Storage Calculation Method for Continuous Casting-hot rolling

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Journal of Iron and Steel Research International 2004年第1期11卷 33-36页

作者： PENGQi-chun LIUQing TIANNai-yuan WuhanUniversityofScienceandTechnology Wuhan430081China UniversityofScienceandTechnologyBeijing Beijing100083China

Based on load-oriented manufacturing control theory,different combining modes and slab storage calculation method for continuous casting and hot rolling were *** buffer capacity index of continuous casting-rolling was introduced,and the reasonable slab storage under different combining modes was calculated with buffer capacity index of 120.00 hfor CCR,79.20 hfor HCR,19.68 hfor DHCR and 3.84 hfor *** slab is 1.20 h,and the strip is *** gist was provided for steel enterprise to decrease storage.

关键词： continuous casting hot rolling production control slab storage

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MODELING OF FERRITE GRAIN GROWTH OF LOW CARBON STEELS DURING hot rolling

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Acta Metallurgica Sinica(English Letters) 2002年第3期15卷 267-271页

作者： Y.T. Zhang, D.Z. Li and Y.Y. LiInstitute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China Manuscript received 26 December 2001 in revised form 9 February 2002 Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

For most commercial steels the prediction of the final properties depends on accurately calculating the room temperature ferrite grain size. A grain growth model is proposed for low carbon steels Q235B during hot rolling. By using this model, the initial ferrite grain size after continuous cooling and ferrite grain growing in coiling procedure can be predicted. In-plant trials were performed in the hot strip mill of Ansteel. The calculated final ferrite grain sizes are in good agreement with the experimental ones. It is helpful both for simulation of microstructure evolution and prediction of mechanical properties.

关键词： Ferrite Forecasting Grain growth hot rolling Iron and steel plants Mathematical models Mechanical properties

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