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| 1 | THE MICROSTRUCTURAL BANDING IN THE CENTER OF HOT ROLLLNG STRIP显示文摘The microstructural banding in steels is often found in hot rolling strips, which plays a very im- portant role in mechanical properties. Much work has been done to investigate how the mi- crostructural banding is formed during hot rolling. In the present study, the microstructure of hot rolling strips was examined in term of optical microscopy and transmission electron mi- croscopy. Electron probe microanalysis was also used to decide the distribution of microchemi- cal bands, by this means, the phases in these strips were found to be ferrite and pearlite. The average distance between the carbon lamellas in pearlite is about 0.06-0.1μm. It is also shown that microstructural banding in hot rolled carbon steel was closely related to the segregation of manganese and silicon into those bands. Based on the transformation kinetic, the simulated re- sults pointed out that the thermodynamic stability of austenite would increase with the increasing of Mn, which led to a decrease of ferrite growth rate. The effect of Mn on the decomposition of austenite is attributed to segregation of Mn atoms along the ferrite/austenite phase boundary which causes a strong solute drag effect. The addition of Mn to steel decreases the activity of austen- ite, thereby it is beneficial to the formation of non-equilibrium phase, such as degenerate pearlite. The formation of banded structure on the hot rolled process was discussed. | C.L. Mo Y. T. Zhang D.Z. Li Y. Y. Li | 2005 | Acta Metallurgica Sinica(English Letters)2005，18，5： | 4 |
| 2 | MODELING OF FERRITE GRAIN GROWTH OF LOW CARBON STEELS DURING HOT ROLLING显示文摘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. Finally, 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. | 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 | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，3： | 4 |
| 3 | FINITE ELEMENT ANALYSIS FOR MICROSTRUCTURE EVOLUTION IN HOT FINISHING ROLLING OF STEEL STRIPS显示文摘A computer model that describes the evolution of microstructures during the hot finishing rolling of SS400 steel has been proposed. It has been found that the microstructure strongly depends on processing of materials and on their parameters,which affected the history of the thermomechanical variables,such as temperature,strain,and strain rate. To investigate the microstructural evolutions during the hot finishing rolling process,the rigid-thermoviscoplastic finite element method(FEM) has been combined with dynamic recrystallization,static recrystallization,and grain growth models. The simulation results show a good agreement with those from the prediction software online. | Z.D. Qu S.H. Zhang D.Z. Li Z.T. Wang | 2007 | Acta Metallurgica Sinica(English Letters)2007，20，2： | 2 |
| 4 | Effect of delta ferrite on impact properties of low carbon 13Cr–4Ni martensitic stainless steel显示文摘 | P. Wang S.P. Lu N.M. Xiao D.Z. Li Y.Y. Li | 2010 | Materials Science & Engineering A2010，，13： | 2 |
| 5 | Growth modes of individual ferrite grains in the austenite to ferrite transformation of low carbon steels显示文摘 | D.Z. Li N.M. Xiao Y.J. Lan C.W. Zheng Y.Y. Li | 2007 | Acta Materialia2007，，18： | 1 |
| 6 | Phase Change Heat Transfer Simulation for Boiling Bubbles Arising from a Vapor Film by the VOSET Method显示文摘 | D.Z. Guo D.L. Sun Z.Y. Li W.Q. Tao | 2011 | Numerical Heat Transfer Part A: Applications2011，，11： | 1 |
| 7 | A methodology for eco-efficiency evaluation of residential development at city level显示文摘 | D.Z. Li Eddie C.M. Hui Barbara Y.P. Leung Q.M. Li X. Xu | 2009 | Building and Environment2009，，3： | 1 |
| 8 | The influence of growth temperature on ZnO nanowires显示文摘 | F. Fang D.X. Zhao J.Y. Zhang D.Z. Shen Y.M. Lu X.W. Fan B.H. Li X.H. Wang | 2007 | Materials Letters2007，，6： | 1 |
| 9 | EFFECT OF ROTATING MAGNETIC FIELD ONMACROSTRUCTURE OF A CENTRIFUGALCASTING Al-1%Cu ALLOY显示文摘Rotating electromagnetic field is applied to the centrifugal casting, the macrostructure of centrifugal casting Al-1%Cu alloy stirred with driving or backing magnetic field are both examined. It is shown that both kinds of electromagnetic filed can enforce the columnar-equiaxed transition, the driving one decrease the tendency of porosity occurring due to the increase in the bulk liquid pressure. Stirring with braking electromagnetic field produces the mixture of outer fine grains and inner coarse grains in the casting, this is analyzed to be contributed to the differences both in electric conductivity and density between the crystal and the melt, as well as skin effects. | W.X. Han, X.H. Qin, D.Z. Li and K. Yang (Institute of Metal Research, The Chinese Academy of Sciences, Shengyang 110015, China) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，5： | 0 |
| 10 | PREDICTION OF CARBON CONCENTRATION AND FERRITE VOLUME FRACTION OF HOT-ROLLED STEEL STRIP DURING LAMINAR COOLING显示文摘A phase transformation model was presented for predicting the phase fraction transformed and the carbon concentration in austenite for austenite to ferrite transformation during laminar cooling on run-out table in hot rolling strip mill. In this model, the parameter k in Avrami equation was developed for carbon steels. The wide range of chemical composition, the primary austenite grain size, and the retained strain were taken into account. It can be used to predict the ferrite volume fraction and the carbon concentration in austenite of hot-rolled steel strip during laminar cooling on run-out table. The coiling temperature controlling model was also presented to calculate the temperature of steel strip. The transformation kinetics of austenite to ferrite and the evolution of carbon concentration in austenite at different temperatures during cooling were investigated in the hot rolled Q235B strip for thickness of 9.35, 6.4, and 3.2mm. The ferrite volume fraction along the length of the strip was also calculated. The calculated ferrite volume fraction was compared with the log data from hot strip mill and the calculated results were in agreement with the experimental ones. The present study is a part of the prediction of the mechanical properties of hot-rolled steel strip, and it has already been used on-line and off-line in the hot strip mill. | Y.T. Zhang C.Z. Wang D.Z. Li Y.Y. Li | 2007 | Acta Metallurgica Sinica(English Letters)2007，20，4： | 0 |
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