2004年, 第11卷, 第3期　刊出日期：2004-05-25

  

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  Mathematical Viscosity Models for Ternary Metallic and Silicate Melts

  FU Yuan-kun, MENG Xian-min, GUO Han-jie

  钢铁研究学报（英文版）. 2004, 11(3): 1-4.

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  The mathematical viscosity models for metallic melts were discussed. The experimental data of Ag-Au-Cu systems were used to verify the models based on Chou's general geometric thermodynamic model and the calculated results are consistent with the reported experimental data. A new model predicting the viscosity of multi-component silicate melts was established. The CaO-MnO-SiO₂, CaO-FeO-SiO₂ and FeO-MnO-SiO₂ silicate slag systems were used to verify the model.
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  Relationship between Thermodynamic Parameters for Mn-Fe Melt and Temperature

  CHEN Er-bao, DONG Yuan-chi, GUO Shang-xing, WU Bao-guo

  钢铁研究学报（英文版）. 2004, 11(3): 5-10.

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  The carbon solubility in Mn-Fe melts were measured at 1350℃, 1375℃, 1425℃ and 1450℃, and accordingly the calculated equations were obtained. By thermodynamic derivation and calculation, some relationships between thermodynamic parameters for Mn-Fe melt and temperature were obtained.
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  Preparation of Semisolid Slurry for Stainless Steel 1Cr18Ni9Ti

  MAO Wei-min, ZHAO Ai-min, YUN Dong, ZHANG Le ping, ZHONG Xue you

  钢铁研究学报（英文版）. 2004, 11(3): 11-14.

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  The preparation of nondendritic semisolid slurry for stainless steel 1Cr18Ni9Ti was studied. The experiments show that when stirred for 2—3 min under the test condition, the semisolid slurry with solid of about 50% and spherical primary austenite in size of 100—200pm can be obtained, and besides the slurry is easy to flow out through the bottom hole of the stirring chamber. More homogeneous temperature fields and solute fields of stainless steel1Cr18Ni9Ti melt appear because of the electromagnetic stirring, which restrains the formation of large primary austenitic dendrites and creates a base to form spherical crystals of primary austenite. The stronger temperature fluctuation in the melt containing many stirring-initiate drosette primary austenitic grains, together with the simultaneous remelting of the secondary arm roots primarily account for the deposition of the spherical primary austenitic grains.
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  Application of Cooling Water in Controlled Runout Table Cooling on Hot Strip Mill

  LIU Zheng-dong, IV Samarasekera

  钢铁研究学报（英文版）. 2004, 11(3): 15-23.

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  The controlled runout table cooling is essential in determining the final mechanical properties and flatness of steel strip. The heat of a hot steel strip is mainly extracted by cooling water during runout. In order to study the heat transfer by water jet impingement boiling during runout, a pilot facility was constructed at the University of British Columbia. On this pilot facility, the water jet impingement tests were carried out under various cooling conditions to investigate the effect of processing parameters, such as cooling water temperature, water jet impingement velocity, initial strip temperature, water flow rate, water nozzle diameter and array of water nozzles, on the heat transfer of heated strip. The results obtained contribute to the optimization of cooling water during runout.
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  Application of Shape Lock-on Method in Plate Rolling

  HU Xian-lei, WANG Jun, WANG Zhao-dong, LIU Xiang-hua, WANG Guo-dong

  钢铁研究学报（英文版）. 2004, 11(3): 24-26.

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  AGC system can improve the plate gauge precision, and damage the plate shape if the shape control loop is left quite open. This damage will cause wave during rolling wide-thin plate. A control strategy named shape lock-on method is afforded for plate shape control. This method requires APC instead of AGC at last one or two passes during rolling wide-thin plate. Approved by theory and on-line application, this method is good for the plate shape and crown control with small effect on gauge control.
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  Controlled Rolling and Controlled Cooling Technology of Ultra-High Strength Steel with 700 MPa Grade

  QI Shi-ze, ZHANG Pi-jun, DU Lin-xiu, LIU Xiang-hua, WANG Guo-dong

  钢铁研究学报（英文版）. 2004, 11(3): 27-32.

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  With Gleeble-1500 system, the influences of rolling temperature, finishing temperature and cooling rate on the mechanical properties of two ultra-high strength steels were analyzed. The microstructure of the hot rolled specimens was observed by optical microscope, TEM and SEM. The TRIP of HSLA steels was studied. The results show that the yield stress of 700 MPa can be reached for two steels. The controlled rolling and controlled cooling technology has different effects on two steels, but it is rational to adopt finishing temperature 800℃ for both of them. The microstructure of the steels is mainly bainite, and the influence factors of mechanical properties are the size of bainite, and the size, distribution, composition and morphology of secondary phases. The deformation of high molybdenum steels at a high temperature with a high cooling rate would promote TRIP.
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  Development of Search System Used for Material Processing by Mobile Internet

  WANG Jun, ZHANG Li, FAN Lei

  钢铁研究学报（英文版）. 2004, 11(3): 33-36.

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  A wireless search system was integrated on Windows 2000 server. Based on the communication principle between wireless data and Internet, the object expression of search file, the automatic query of document information, the segment browsing of result information, and the receiving and sending of user information were realized by using Active Server Page 3. 0, VB Script, WML Script insert languages and object orient database technology. The requirement querying information of material processing through Internet by GPRS, WAP mobile handset and so on was accomplished.
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  Density of Liquid Steel over Temperature Range of 1803-1873 K

  XIAO Feng, FANG Liang

  钢铁研究学报（英文版）. 2004, 11(3): 37-40.

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  The density of three kinds of liquid steel was measured by a modified sessile drop method over the temperature range of 1803—1873 K. It is found that the density of liquid steels decreases with increasing temperature and carbon content in steel. Both of the density and its absolute temperature coefficient of studied steels are smaller than the literature values of pure iron. The molar volume of the steels increases with increasing temperature.
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  Nucleation of Bainite in Bainite Ductile Cast Iron

  ZHAI Qi-jie, LIU Guo-jun, ZHAI Hua-ying, LI Zu-qi

  钢铁研究学报（英文版）. 2004, 11(3): 41-43.

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  The bainite ductile cast iron with given composition was quenched to get bainite structure. The nucleating position of bainite and the distribution of alloying elements in the matrix were measured. The results show that the bainite nucleates at the interface between graphite and austenite during quenching. Based on the experimental results and thermodynamics, the nucleating mechanism of bainite in ductile iron was analyzed.
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  Characteristics of Deformation Layer for Vermicular Iron under Dry Sliding Friction

  SUN Le-min, SHANG Guan-bao, ZHANG Yong-zhen, CHEN Yue

  钢铁研究学报（英文版）. 2004, 11(3): 44-47.

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  At room temperature, dry sliding wear tests were carried out using pin-on-disc test rig, in which the pin is made of vermicular iron and the disc is made of 40Cr steel. The micro-structures of the frictional surfaces for the pin specimens were investigated. Under the action of both frictional heat and frictional shearing stress, a plastic deformation layer under the friction-al surface is formed. The morphology and properties of the plastic deformation layer depend on specimen material, contact pressure and frictional shearing stress. In the plastic deformation layer, the phosphorous mass percent varies at different depth and results in different hardness. On the outer side of surface, the hardness is the biggest and the phosphorous mass percent is the highest. They become gradually small from outer side to inner side of the surface.
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  Comparison of Metal Dusting Behavior of Several Alloys

  HAN Guang-wei, DENG Bo, FENG Di

  钢铁研究学报（英文版）. 2004, 11(3): 48-52.

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  Metal dusting behaviors of several alloys with different chromium contents and other elements were investigated in a given gaseous environment. The samples of the alloys were ex-posed at 650℃ for 650 h, and were periodically removed to examine coke protrusions and pits formed on the sample surfaces by SEM and determine metal wastage. The results were interpreted in terms of the compositional variations of the employed alloys.
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  Mechanical Property of Foamed Metal

  LIU Pei-sheng, SANG Hai-bo

  钢铁研究学报（英文版）. 2004, 11(3): 53-58.

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  A comprehensive study on the mechanical behavior of foamed metals was demonstrated. The relationship among their mechanical properties, preparation method, porosity and the structure was briefly studied as well.
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  Effect of Al₂O₃ on Structure and Wearability of Composite Coating

  DING Hong-yan, ZHANG Yue

  钢铁研究学报（英文版）. 2004, 11(3): 59-62.

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  The composite coating was prepared by thermal spray welding after making composite powder, which is composed of Ni-based self-melted alloy and Al₂O₃ ceramic powder including nano, sub-micron and micron powders. The influences of contents and sizes of Al₂O₃ on the structure and wearability were investigated. The results show that the wear resistance of the coating would be increased greatly by adding Al₂O₃, but the spray weldability decreases with increasing Al₂O₃ content. So there is an optimal content of Al₂O₃ powder. The composite coating with Al₂O₃ nano or sub-micron powder of 0. 5% has the best abrasive resistance, while the optimal content ofAl₂O₃ micron powder is 1%.