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Frictional Heat-Induced Phase Transformation on Train Wheel Surface

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Journal of iron and steel Research International 2008年第5期15卷 49-55页

作者： SU Hang PAN Tao LI Li YANG Cai-fu CUI Yin-hui JI Huai-zhong Division of Structural material Research Central Iron and Steel Research Institute Beijing 100081 China ma＇anshan iron and steel company limited Ma＇anshan 243000 Anhui China

By combining thermomechanical coupling finite element analysis with the characteristics of phase transformation [continuous cooling transformation （CCT） curve], the thermal fatigue behavior of train wheel steel under high speed and heavy load conditions was analyzed. The influence of different materials on the formation of the phase transformation zone of the wheel tread was discussed. The result showed that the peak temperature of wheel/track friction zone could be higher than the austenitizing temperature for braking. The depth of the austenitized region could reach a point of 0.9 mm beneath the wheel tread surface. The supercooled austenite is transformed to a hard and brittle martensite layer during the following rapid cooling process, which may lead to cracking and then spalling on the wheel tread surface. The decrease in carbon contents of the train wheel steel helps inhibit the formation of martensite by increasing the austenitizing temperature of the train wheel steel. When the carbon contents decrease from 0.7% to 0.4%, the Ac3 of the wheel steel is increased by 45 ℃, and the thickness of the martensite layer is de creased by 30 %, which is helpful in reducing the thermal cycling fatigue of the train wheel tread such as spalling.

关键词： train wheel steel thermal cycling fatigue friction martensite transformation thermomechanical coupling

Cleaning IF molten steel with dispersed in-situ heterophases induced by the composite sphere explosive reaction in RH ladles

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International Journal of Minerals,Metallurgy and materials 2011年第2期18卷 144-149页

作者： Fu-ping Tang Zhen Li Xiao-feng Wang Ben-wen Chen Peng Fei anshan iron ＆ steel Group company Anshan 114014 China

A novel fine inclusion removal technology was put forward with dispersed in-situ heterophases induced by the composite sphere explosive reaction. A composite sphere with this function was designed and prepared using a laboratory scale batch-type balling disc （at 12 r/min）, and the composite sphere was fed at the end of the RH refining process. The results indicate that inclusions in the IF molten steel can be removed effectively by feeding composite spheres in RH ladle. Compared with conventional inclusion removal technology, using this novel technology, the amount of oxide inclusions can be decreased to a lower level and the inclusion size becomes finer, the total oxygen content in the as-cast slab can approach 5×10？6, and the cost per ton of steel produced can be reduced by 5-12 Yuan RMB.

关键词： IF steel refining bubbles slags filtration inclusions

Separation occurring during the drop weight tear test of thick-walled X80 pipeline steels

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International Journal of Minerals,Metallurgy and materials 2013年第8期20卷 741-747页

作者： Qing-yun Sha Da-hang Li Guo-jian Huang Ju Guan Technology Center Anshan Iron and Steel Group Company

A separation phenomenon occurring during the drop weight tear test of commercial thick-walled API （American Petroleum Institute） X80 strip steel was investigated in this work. Microstructural analysis showed that the band structure of bainite elongated along the rolling direction works as the initiation sites of separation. The propagation of separation can be promoted not only by the occurrence of the band structure of martensite/austenite constituent, prior austenite grain boundaries, and elongated bainite, but also by fine acicular ferrite and bainite. Wide separation formed in the former case, while the narrow one appeared in the latter case. acicular ferrite in thick-walled X80 pipeline steel in order Some methods were proposed to obtain fine and homogeneous to minimize the occurrence of separation.

关键词： pipeline steel drop weight tear test separation cracking band structure

A STUDY ON DEFORmaTION CHARACTERISTIC OF ULTRA HIGH STRENGTH steel AND ITS FRACTURE

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Applied mathematics and Mechanics(English Edition) 1982年第4期3卷 591-598页

作者：韩富义 The iron and steel Research Institute of the anshan iron and steel company

A new shape on the load and elongation curve of ultra highstrength structural steel in tension is measured by means of theadvanced physical methods.A method of calculating true stress-true strain is found in accordance with the whole *** calculation results show that during the period of de-formation,whether prior to or after the maximum load,all arestaged power *** method of calculating hardening index is finally studied for discussion.

关键词： A STUDY ON DEFORmaTION CHARACTERISTIC OF ULTRA HIGH STRENGTH steel AND ITS FRACTURE

Research and Application of Non-symmetrical Roll Bending Control of Cold Rolling Mill

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Chinese Journal of Mechanical Engineering 2012年第1期25卷 122-127页

作者： WANG Pengfei ZHANG Dianhua LI Xu LIU Jiawei WANG Junsheng State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004China anshan iron and steel company Anshan 114001China

The existing research of the flatness control for strip cold rolling mainly focuses on the calculation of the optimum adjustment of individual flatness actuator in accordance with the flatness deviation, which can be used for general flatness control. However, it does not work for some special rolling processes, such as the elimination of ultra single side edge-waves and the prevention of strip break due to tilting roll control overshooting. For the purpose of solving these problems, the influences of non-symmetrical work roll bending and intermediate roll bending on flatness control were analyzed by studying efficiencies of them. Moreover, impacts of two kinds of non-symmetrical roll bending control on the pressure distribution between rolls were studied theoretically. A non-symmetrical work roll bending model was developed by theoretical analysis in accordance with practical conditions. The model was applied to the revamp of a 1250 6-H reversible universal crown mill (UCM) cold mill. Theoretical study and practical applications show that the coordination utilization of the non-symmetrical work roll bending control and tilting roll control was effective in flatness control when there appeared bad strip single side edge waves, especially when the incoming strip was with a wedge shape. In addition, the risk of strip break due to tilting control overshooting could be reduced. Furthermore, the non-symmetrical roll bending control can reduce the extent of uneven distribution of pressure between rolls caused by intermediate roll shifting in flatness control and slow down roll wear. The non-symmetrical roll bending control technology has important theoretical and practical significance to better flatness control.

关键词： non-symmetrical roll bending flatness control cold rolling actuator efficiency roll wear strip break

Experiment and Simulation of Metal Flow in Multi-stage Forming Process of Railway Wheel

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Journal of iron and steel Research International 2015年第1期22卷 21-29页

作者： Xiao-hui SHEN Wei CHEN Jun YAN Lei ZHANG Jing ZHANG School of Metallurgical Engineering Anhui University of Technology Tyre and Wheel company Ma'anshan Iron and Steel Co.Ltd.

To investigate the metal flow during the railway wheel forming process, experiments and finite element method （FEM） simulation were carried out. An axisymmetric modeling for the wheel rolling process was proposed to predict the metal flow in radial direction, by which the whole multi-stage forming process could be simulated in axisymmetric and integral way. The result shows that the axisymmetric simulation method was an effective method to explore the metal flow in radial direction and to analyze the relationships of tools motion during the wheel rolling. The detail information about metal flow in railway wheel forming process was obtained. The metal in the wheel web was from the area near the half radius of the original billet; the chill zone of the billet became an envelope of the rim and part of the web with a maximum thickness of about 6 mm below the tread. At the wheel rolling stage, the metal in the rim flowed towards the web; the metal near the surfaces of the conjunction region between the web and rim suffered severe shear deformation.

关键词： railway wheel metal flow multi-stage forming experiment simulation

Effects of micro-alloying and production process on precipitation behaviors and mechanical properties of HRB600

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Journal of iron and steel Research International 2017年第5期24卷 536-543页

作者： Hong-bo Pan Meng-jiao Zhang Wei-ming Liu Jun Yan Hui-ting Wang Chang-sheng Xie Zhan Guo Key Laboratory of Metallurgical Emission Reduction & Resources Recycling of Ministry of Education Anhui University of Technology Ma'anshan 243002 Anhui China Anhui Province Key Laboratory of Metallurgy Engineering & Resources Recycling Anhui University of Technology Ma'anshan 243002 Anhui China School of Metallurgical Engineering Anhui University of Technology Ma'anshan 243002 Anhui China Technology Center Ma'anshan Iron & Steel Company Limited Ma'anshan 243000 Anhui China

Effects of micro-alloying elements and production process on microstructure, mechanical properties and precipitates of 600 MPa grade rebars were studied by using pilot test, metallographic observa- tion, tensile test, thermodynamic calculation and transmission electron microscopy. The results show that the tested steels are composed of ferrite and pearlite, in which the conterlt range of pearlite is 33%-45%. For vanadium micro-alloyed steel, interphase preeipitation Strengthening effect of V can be promoted and the yield strength of tested steels can be increased with increasing V content and de- creasing finishing rolling temperature. The temperature of terminated cooling should be more than 700 ℃ when the water cooling is used. When niobium is added to the steel, more coarse （Nb,V）C,N precipitates are generated at high temperature, so that the solid solubility of precipitated phases of vanadium is reduced and the precipitation strengthening effect of vanadium is weakened.

关键词： Micro-alloying High-strength steel rebar Thermo-mechanical controlling process Mechanical property Precipitation strengthening Thermodynamics

Individual Grain Orientation and Heterogeneous Deformation in Cold-deformed Interstitial-Free Sheet steel

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Journal of materials Science & Technology 2007年第5期23卷 689-692页

作者： Yandong LIU Chungang WANG Qiwu JIANG Tong HE Liang ZUO School of materials and Metallurgy Northeastern University Shenyang 110004 China Production manufacture Department Angang Steel Company Limited Anshan 114001 China Factory of Cold Rolling Silicon steel Angang Steel Company Limited Anshan 114001 China

The cold rolling deformation textural evolution of an interstitial-free （IF） steel sheet is investigated by experiment and simulation. The microstructure of the IF steel is observed by transmission electron microscopy （TEM）. The relationship between the deformation behavior of individual grain and the grain orientation are connected by Taylor factor M. The results show that the grains with higher Taylor factor are deformed slighter than those with lower ones. By considering the heterogeneous deformation, the texture simulation result can be greatly improved.

关键词： IF steel Texture Heterogeneous deformation Taylor factor

A New Route for Identification of Precipitates on Austenite Grain Boundary in an Nb-V-Ti Microalloyed steel

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Journal of iron and steel Research International 2011年第8期18卷 53-57页

作者： SHA Qing-yun HUANG Guo-jian GUAN Ju ma Xiao-jun LI Da-hang Technology Center Angang Steel Company Limited Anshan 114009 Liaoning China

The precipitates on austenite grain boundaries in an Nb-V-Ti microalloyed steel have been investigated by transmission electron microscope （TEM） examination of carbon extraction replica. The replica was prepared from specimen etched with saturated picric solution rather than Nital which is conventionally used. Then particles on both grain boundaries and triple point of grain [aoundaries were clearly observed and identified as （Nb,Ti）（C, N） parti- cles. In case of conventional way, it is difficult to determine the location of particles with respect to austenite grain boundaries. The number of particles observed in new way developed was greatly reduced compared with that found in replica prepared by the conventional way, which may be caused by the dissolution of partial precipitates during the etching with longer time and at higher temperature involved in new way. Despite this, the new way developed pro- vides an effective way to determine the precipitate particles on austenite urain boundaries_

关键词： precipitate austenite grain boundary replica etch