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A simple lattice Boltzmann scheme for low Mach number reactive flows

Science china(Technological Sciences) 2006年第6期49卷 714-726页

作者： CHEN Sheng1,2, LIU Zhaohui2, ZHANG Chao2, HE Zhu2, TIAN Zhiwei2, SHI Baochang 2 & ZHENG Chuguang2 1. technology center of wuhan iron and steel (Group) Company, wuhan 43.080, china 2. State Key Laboratory of Coal Combustion, Hua Zhong University of Science and technology, wuhan 430074, china technology center of wuhan iron steel [Group] Company Wuhan 430080 China State Key Laboratory of Coal Combustion Hua Zhong University of Science technology Wuhan 430074 China

For simulating low Mach number reactive flows, a simple and coupled lattice Boltzmann (CLB) scheme is proposed, by which the fluid density can bear significant changes. Different from the existing hybrid lattice Boltzmann (HLB) scheme and non-coupled lattice Boltzmann (NCLB) scheme, this scheme is strictly lattice Boltzmann style and the fluid density couples directly with the temperature. Because it has got rid of the constraint of traditional thought in lattice Boltzmann scheme,on the basis of the equality among the particle speed c, the time step △t and the lattice grid spacing △x held, both c and △t can be adjusted in this scheme according to a "characteristic temperature" instead of the local temperature. The whole algorithm becomes more stable and efficient besides inheriting the intrinsically outstanding strong points of conventional lattice Boltz-mann scheme. In this scheme, we also take into account different molecular weights of species, so it is more suitable for simulating actual low Mach number reactive flows than previous work. In this paper, we simulated a so-called "counter-flow" premixed propane-air flame, and the results got by our scheme are much better than that obtained by NCLB. And the more important thing is that the exploration in this work has offered a kind of brand-new train of thought for building other novel lattice Boltzmann scheme in the future.

关键词： lattice Boltzmann, low Mach number flows, reactive flows, simulation.

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Thermal Behaviors of Work Roll in Finishing Trains of Hot Rolling

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Journal of University of Science and technology Beijing 2001年第1期8卷 59-62页

作者： Anrui He, Jie Zhang, Chen Zhang, Qingdong Zhang, Gangcheng Wei, Siqing Huang Mechanical Engineering School, University of Science and technology Beijing, Beijing 100083, china wuhan iron and steel Group corporation, wuhan 430083, china Univ Sci & Technol Beijing Sch Mech Engn Beijing 100083 Peoples R China wuhan iron & steel Grp Corp Wuhan 430083 Peoples R China

In order to analyze the thermal field and thermal contour of work roll in finishing trains of hot rolling in rolling process, a quasi two-dimension implicit finite difference model is developed. To improve the calculating speed and precision, some special solutions are introduced, including the development of this model, the simplification of boundary conditions and the computation of heat transfer coefficients. The results show that these solutions of thermal behaviors of work roll are very much efficient and the model can be used as an on-line profile and fatness control model of large industrial mills.

关键词： hot rolling work roll thermal behaviors finite difference method

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Study of the Microstructure and Properties of ER70S-6 Wire Rods

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Journal of iron and steel Research International 2011年第S1期18卷 929-932页

作者： HUANG Zhi-jun,WANG Yu-tao,XIONG Yan (Products Research Institute,R and D center of wuhan iron and steel (Group) corporation,wuhan 43.080,Hubei,china) wuhan iron & steel Grp Corp R&D Ctr Prod Res Inst Wuhan 430080 Hubei Peoples R China

After rolling even after drawing,a fraction of martensite may occur in the microstructure of ER70S-6 wire deteriorating the ductility and drawing *** mid-products of drawing for test were heat treated at 350℃ and 500℃,deformed ferrite plus pearlite plus some unchanged martensite and deformed ferrite plus pearlite plus troostite were obtained *** bending test was carried out on both as-drawn and heat-treated *** results showed that the brittleness of the as-drawn rods is not due to defects but due to the presence of martensite in *** sample heat-treated at 500℃ and cooled in oven has the best ductility.

关键词： ER70S-6 microstructure heat treatment ductility

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Influence of Mo Content on Microstructure and Mechanical Properties of Fire-Resistant Construction steel

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Journal of iron and steel Research International 2011年第S1期18卷 903-907页

作者： TONG Ming-wei 1,2,YUAN Ze-xi 1,ZHANG Kai-guang 2,RUI Xiao-long 2 (1.School of Materials and Metallurgy,wuhan University of Science and technology,wuhan 430081,Hubei,china 2.Research and Development center of wuhan iron and steel (Group) Corp,wuhan 43.080,Hubei,china) wuhan Univ Sci & Technol Sch Met & Mat Wuhan 430081 Hubei Peoples R China wuhan iron & steel Grp Corp Ctr Res & Dev Wuhan 430080 Hubei Peoples R China

In order to ensure fire-resistant property of the steel under the condition of the least molybdenum content,effects of molybdenum on microstructure and properties of the fire-resistant construction steel,specially on high temperature strength were *** results show that the room temperature and high temperature strength of the steel is enhanced due to increased Mo content but the impact toughness deteriorates at the same *** fraction of bainite in the microstructure increases with increasing Mo content while the fractions of polygonal ferrite and pearlite *** with the steel of adding Nb alone,it was obvious that combined addition of Mo and Nb could provide better effect in high temperature *** of 0.25mass% Mo in the steel containing Nb could meet fire-resistant requirements of the construction steel and provide better economical effectiveness.

关键词： fire-resistant construction steel high temperature strength microstructure precipitate molybdenum

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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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EFFECTS OF CARBON CONTENT AND ROLLING PROCESSING ON RETAINED AUSTENITE FOR HOT-ROLLED TRIP steelS

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Acta Metallurgica Sinica(English Letters) 2002年第5期15卷 439-447页

作者： Y. Chen, X. Chen, Z.X. Yuan, B.F. Xu, A.M. Guo, P.H. Li and S.K. Puwuhan University of Science and technology, wuhan 430081, chinaTechnical center of wuhan iron and steel Co., wuhan 43.080, china wuhan University of Science and technology Technical center of wuhan iron and steel Co.

The effects of finishing rolling temperature and coiling temperature on retained austen-ite were studied for hot-rolled transformation induced plasticity (TRIP) steels with different carbon content. The experimental results showed that an appropriate volume fraction of retained austenite from 6% to 11% could be obtained according to the different carbon content less than 0.20% by controlled finishing rolling and coiling for the hot-rolled TRIP steels. It can be concluded that carbon content has a significant effect on the fraction of retained austenite and coiling processing plays stronger role on retaining austenite than fishing rolling processing.

关键词： TRIP steel carbon content retained austenite

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Effect of Nb,Mo and Ti on the Microstructures and Mechanical Properties of 700MPa Weathering steel

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Journal of iron and steel Research International 2011年第S1期18卷 300-305页

作者： WANG Bing 1,SONG Yu-lai 2,WEN Xiao-ming 3,WANG Hou-xin 4,LIU Qing-you 1 (1.Institute for Structural Materials of CISRI,Beijing 100081,china 2.Research and Development center of wuhan iron and steel (Group) Corp.,wuhan 43.080,Hubei,china 3.Benxi iron and steel Group Limited Company Benxi 117000,Liaoning,china 4.CITIC-CBMM Microalloying technology center,Beijing 100081,china) Inst Struct Mat CISRI Beijing 100081 Peoples R China wuhan iron & steel Grp Corp Ctr Res & Dev Wuhan 430080 Hubei Peoples R China Benxi iron & steel Grp Ltd Co Benxi 117000 Liaoning Peoples R China CITIC CBMM Microalloying Technol Ctr Beijing 100081 Peoples R China

Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness,tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weathering steel was studied under the same rolling *** results show the formation of M/A is promoted by Mo,while inhibited by ***,M/A island,as a hard phase,is harm to the material toughness and plasticity;high M/A island fraction will result in obvious crack during cold *** effect of Nb on increasing the strength of experiment steel is very *** Nb content of 700MPa steel must be higher than 0.05% to ensure the *** optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,Mo and *** industry trial production of 700MPa high-strength weathering steel for container was also developed.

关键词： weathering steel Nb Mo Ti mechanical properties M/A island

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EFFECT OF CHEMICAL COMPOSITION ON RETAINED AUSTENITE IN TRIP steel

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Acta Metallurgica Sinica(English Letters) 2002年第4期15卷 339-345页

作者： Y. Chen and X. Chenwuhan University of Science and technology, wuhan 430081, chinaQ.F. Wang, G.L. Yuan and. C. Y. LiTechnical center of wuhan iron and steel Co., wuhan 43.080, chinaX. Y. Li and Y.X. WangCentral iron and steel Research Institute, Beijing 1 wuhan University of Science and technology Technical center of wuhan iron and steel Co.

The systematic chemical compositions including common C, Si, Mn, Al, and micro-alloying elements of Ti and Nb were designed for high volume fraction of retained austenite as much as possible. The thermo-cycle experiments were conducted by using Gleeble 2000 thermo-dynamic test machine for finding the appropriate composition. The experimental results showed that chemical composition had a significant effect on retained austenite, and the appropriate compositions were determined for commercial production of TRIP steels.

关键词： carbon content silicon content manganese content retained austenite TRIP steel

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Theoretical calculation of the finishing rolling elongation in alloying non-quenched and tempered steel

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Progress in Natural Science:Materials International 2006年第8期16卷 859-867页

作者： LIU Zhilin, LIN Cheng and GUO Yanchang (Department of Materials and Chemical Engineering, Liaoning Institute of technology, Jinzhou 121001, china The Technical center of Benxi iron and steel Group corporation, Benxi 117000, china) [a]Department of Materials and Chemical Engineering Liaoning Institute of Technology Jinzhou China [b]The Technical center of Benxi iron and steel Group corporation Benxi China

The finishing rolling elongationδof the alloying non-quenched and tempered steel is calculated with the covalent electron number nA of the strongest bond of the alloying phases and the interface electron density differenceΔρof the phase interfaces. The calculations show that the elongationδα-Fe of the matrixα-Fe decreases with rolling refinement, the elongationδα-Fe-C-M of solid solution phases (M denotes alloying element) is inversely proportional to the covalent electron number nAα-Fe-C-M of the strongest bond, the elonga tion decrementΔδα-Fe/α-Fe-C-M caused by interface strengthening is directly proportional to the interface electron density differenceΔρα-Fe/α-Fe-C-M, but the elongation decrementsΔδα-Fe/MCC1 andΔδα-Fe-C/MCC2 caused by dispersion strengthening and precipitation strength- ening respectively are directly proportional to the ratio of the electron density differenceΔρα-Fe/MCC1 andΔρα-Fe/MCC2 of the strengthening interfaces toΔρα-Fe/α-Fe-C of the basic interfaceα-Fe/α-Fe-C. Therefore, the finishing rolling elongation of the alloying non-quenched and tempered steel is considered to be subtracting all the elongation decrements of solution strengthening, interface strengthening, dispersion strengthening and precipitation strengthening from the elongation of the refinedα-Fe matrix. The calculation formulas in this paper are integrated with the proposed ones ofσS,σb and ofαK delivered in another paper, the finishing rolling mechanical properties can be achieved and the calculated results agree well with the measured ones.

关键词： electron structure parameters alloying non-quenched and tempered steel elongation theoretical calculation.

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Theoretical calculation of the impact work in the alloying non-quenched and tempered steel

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Science china(Technological Sciences) 2006年第3期49卷 257-273页

作者： LIU Zhilin1, LIN Cheng1 & GUO Yanchang2 1. Department of Materials and Chemical Engineering, Liaoning Institute of technology, Jinzhou 121001, china 2. The Technical center of Benxi iron and steel Group corporation, Benxi 117000, china Department of Materials Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China The Technical center of Benxi iron steel Group corporation Benxi 117000 China

Coupled with hot-continuous rolling technology and based on the calculation of the finishing rolling impact work in the non-quenched and tempered Si-Mn steel, the calculations of the finishing rolling impact work in the alloying non-quenched and tempered steel with the elements of Cr, Ni, Mo, W, Cu, V, Nb and Ti are studied with the covalent electron number nA of the strongest bond in alloying phases, the smallest electron density difference ?ρ of phase interfaces, and the number of atom states σ (σ′) which keep the interface electron density continuous. The calculated results show that the finishing rolling impact work of the alloying non-quenched and tempered steel intensely depends on strengthening mechanisms. The solution strengthening, interface strengthening, precipita- tion strengthening of pearlite, and dispersion strengthening will result in the decrease of the finishing rolling impact work; the refinement strengthening, the precipitation strength- ening of V, Nb and Ti in α-Fe-C-V(Nb, Ti), and the residual austenite containing Ni on the boundary of α-Fe-C-Ni will increase the impact work; and the increments or decrements can be calculated with nA, ?ρ, σ (σ′) and weights of alloying elements. The calculation formulas of the finishing rolling impact work in this paper are intergraded with the sug- gested ones of the finishing rolling tensile strength, yield strength, and elongation of the non-quenched and tempered steel. The calculated results agree well with the measured ones.

关键词： alloying non-quenched and tempered steel, electron structure, impact work, calculation.

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