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Light Metals 2015 - TMS 2015 Annual Meeting and Exhibition

作者： Wang, Bo Liu, Jiajia Sun, Huilan Zhang, Yubing Liu, Dongdong School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang050018 China Hebei Key Laboratory of Material Near-Net Forming Technology Hebei University of Science and Technology Shijiazhuang050018 China

ISBN: (纸本)9781119082446

High calcium/aluminum ratio (C/A=12:7) is one of the main problems which inhibit the development of lime sinter process. Decrease the C/A of clinker is studied in this paper. 12CaO·7Al2O3 (C12A7) and CaO·Al2O3 (CA) were synthesized at 1350 °C by analytical pure reagents. The phase composition of sinters was analyzed by XRD and the alumina leaching experiments were carried out. The results show that the optimal alumina leaching ratio of C12A7 and CA are 93.40% and 73.18%. The leaching experiments of the mixture of C12A7 and CA with different proportions were carried out. The alumina leaching ratio of the mixture reaches 91.12% when the content of C12A7 is 40% (in mass). Above this proportion, the alumina leaching ratio increases little. The results show that the existence of C12A7 can promote the leaching property of CA.

关键词： Mixtures

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Research on defects and control method based on thread shaft forming

Research on defects and control method based on thread shaft...

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2015 2nd International Conference on Machinery,materials Engineering,Chemical Engineering and Biotechnology(MMECEB 2015)

作者： Huajun Yan Shuangjie Zhang Shibo Ma School of Materials Science and Engineering Hebei University of Science and Technology Key Laboratory of Material Near-net Forming Technology

ISBN: (纸本)9781510819092

The defects of incomplete tooth,low tooth height and big pitch are easy to produce,when the thread shaft is rolled by cross wedge *** forming defects of teeth are researched by theoretical analysis and numerical simulation,the causes of producing tooth defects are analyzed,and forming process is researched by optimizing the die *** open structure of the die is designed as the closed structure on the end of the thread *** addition,the tooth width of the die is optimized from equal width mode to variable width *** higher quality teeth are obtained and tooth defects are *** research results have a good reference for accurately forming thread shaft.

关键词： Cross wedge rolling Thread shaft Pitch Tooth height PITCHES pitch Cross wedge rolling Tooth Control Methods Outcomes Research Open Architecture forming PROCESSES forming

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FEM Analysis Of Stamping Process For Vehicle Cowl Inner Panel

FEM Analysis Of Stamping Process For Vehicle Cowl Inner Pane...

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2015 3rd International Conference on Mechanical Engineering and Intelligent Systems(ICMEIS 2015)

作者： Huajun Yan Shibo Ma Lijuan Wang Ying Gao School of Materials Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-net Forming Technology

As the important component for bearing collision in the front of the vehicle, the cowl inner panel has complex shape features such as bulges, reinforcing ribs and holes. When the panel is formed, defects of wrinkling, cracking or incomplete forming will occor. The drawing die is designed for a certain type of the cowl inner panel, and the drawing process is simulated using analysis software Dynaform, and influence laws of the binder force and fillet radii of addendum surface are researched, and process parameters are optimized, that is the binder force F equals to 500 kN, the fillets r equals to 25 mm, r2 equals to 25 mm. The conclusion has a certain effect on forming parts with high quality.

关键词： cowl inner panel addendum surface binder force numerical simulation

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The effects of alloy composition and annealing time on microstructure and mechanical properties of Zr3Al-based alloys

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materials Research Innovations 2015年 19卷 S955-S958页

作者： Li, J.H. Gao, Y. Liu, S. Mao, L. Zhang, F.C. Li, Q. Yanshan University Qinhuangdao066004 China Hebei University of Science and Technology Shijiazhuang050000 China Hebei Key Laboratory of Material Near-Net Forming Technology Shijiazhuang050000 China

ZrAl alloys with three different Al contents (6.0, 7.0, 8.0 wt-%) were melted by non-consumable electric-arc furnace. X-ray diffraction and metallographic analysis were used to study the microstructure and phase composition of ZrAl alloys, then rockwell hardness and tensile properties were tested. The results showed that Al significantly enhanced the hardness of pure Zr, and hardness of as-cast ZrAl alloys increased with the increase of Al content. Homogeneous microstructure of Zr3Al-based alloys could be obtained by annealing, and the annealing time must increase with the increase of Al content. With the increase of annealing time, grain size of Zr3Al-based alloys increased, tensile strength and elongation decreased. This implied that when ensuring complete peritectoid reaction conditions, we should minimise annealing time to avoid coarse grain for the purpose of obtaining Zr3Al-based alloys with excellent mechanical properties. In addition, annealing changed the fracture mode of ZrAl alloys from brittle to ductile. © W. S. Maney & Son Ltd 2015.

关键词： Binary alloys

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Influence of temperature on pyrolysis of waste tire under nitrogen atmosphere

Influence of temperature on pyrolysis of waste tire under ni...

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International Conference on Information Sciences,Machinery,materials and Energy（ICISMME 2015）

作者： Yongjuan Dai Guohao Zhang Chi Zhang Guanxu Zhang Dengjie You College of Materials science and engineering Hebei university of science and technology Hebei key laboratory of material near-net forming technology Hebei university of science and technology

An experimental survey of waste tire gasification under nitrogen atmosphere has been conducted in a reactor,the gasification of tire were performed in a series of trials at different processing temperatures,in the range of 100–800 ℃,with the aim of studying the influence of the process temperature on the yield and the composition of the *** experimental results showed that thermal stability of waste tire is divided into 3 zone: ~ 200 ℃,200 ℃ to 300℃ and 300℃-800℃.A higher temperature results in a higher syngas production and a lower char yield,due to an enhancement of the solid–gas phase reactions with the *** N conditions,the oil contains more light oil.

关键词： pyrolysis nitrogen atmosphere temperature waste tire

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Crystal structure and alumina leaching property of Na20 doped C12A7

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Light Metals 2014 - TMS 2014 Annual Meeting and Exhibition

作者： Wang, Bo Zong, Shufeng Sun, Huilan Zhang, Jianxin Zhang, Yubing Liu, Dongdong Liu, Jiajia School OfMaterials Science and Engineering Hebei University of Science and Technology Shijiazhuang 050018 China Hebei Key Laboratory of Material Near-net Forming Technology Hebei University of Science and Technology Shijiazhuang 050018 China

ISBN: (纸本)9781118889084

material of Na,0 doped 12Ca07Al203 (C 12A7-Na20) was prepared by the sol-gel method. And the precursor was sintered at 1623K for 3h. The phase composition and crystal structure of C12A7-Na20 was investigated by XRD analysis. The results indicated that Na20 would occupy the position of CaO or vacancy of C12A7 lattice and promote the formation of C12A7 when calcium/aluminum ratio (Ca0/Al203, molar ratio) was 1.4. Na20 would promote the formation of C3A when calcium/aluminum ratio was 1.7. The lattice parameters also proved the solid solution between C 12A7 and Na20. Alumina leaching experiments were carried out in sodium carbonate solution and the relationship between leaching ratio and doping content, calcium/aluminum ratio were established. Copyright © 2014 by The Minerals, Metals & materials Society.

关键词： Lattice constants

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Decomposition property of γ-2CaOSiO2 during leaching process of calcium aluminate slag

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Light Metals 2014 - TMS 2014 Annual Meeting and Exhibition

作者： Sun, Huilan Wang, Bo Zhang, Jianxin Zong, Shufeng School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang 050018 China Hebei Key Laboratory of Material Near-net Forming Technology Hebei University of Science and Technology Shijiazhuang 050018 China

ISBN: (纸本)9781118889084

γ-2CaOSiO2 is one of the main phases of calcium aluminate slag, which is obtained under 1500°C. Although γ-2CaOSiO2 is more stable than ß-2CaOSiO2, it will still be decomposed by sodium carbonate solution during alumina leaching process, and this will cause the occurrence of secondary reaction. The effect of liquid- solid ratio, caustic alkali, and temperature on decomposition property of γ-2CaOSiO 2 are studied. The secondary reaction mechanism is discussed by XRD analysis. The results indicate that the amount of decomposed SiO2 increase with the increase of caustic alkali concentration, which varies from 30gL-1 to 70g L-1. Leaching temperature affects the decomposition of γ-2CaOSiO2 and secondary reaction obviously. When temperature is above 75°C the influence degree of the latter is more serious than that of the former. XRD results indicate that the stable product of secondary reaction is hydrate garnet at lower temperature, but under higher temperature, hydrate garnet transforms into sodium hydrate alumina-silicate. Copyright © 2014 by The Minerals, Metals & materials Society.

关键词： Sodium Carbonate

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Study of the solid-state joining process for endless hot rolling 4

Study of the solid-state joining process for endless hot rol...

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4th International Conference on Advanced Design and Manufacturing Engineering, ADME 2014

作者： Dai, Yong Juan College of Materials science and engineering Hebei university of science and technology ShijiazhuangHebei China Hebei key laboratory of material near-net forming technology Hebei university of science and technology ShijiazhuangHebei China Hebei Iron and Steel Technology Research Institute Hebei Iron and Steel Group ShijiazhuangHebei China

ISBN: (纸本)9783038352563

In this study, the joint strength and microstructure of carbon steels welded by an super-deformation joining process in air were investigated. The two block of model steels are overlapped and heated. The steels are welded with 1000% deformation at approximately 1000°C. The joint strengths are evaluated by uniaxial tension testing. The joint microstructures and fractured surfaces are investigated with OM and SEM. The results revealed that the mechanical properties of joint are close to the matrix’s, the grains adjacent to the interface are merged into one grain, which indicates that both blocks are soundly joined, fracture surface was covered with dimple indicating ductile fracture occurred. Joint fracture behavior is initiated by the brittle fracture of scale inclusions and growth around the internal oxides. Surface scale is the most important factor of sound joining. © (2014) Trans Tech Publications, Switzerland.

关键词： Microstructure

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Influence of carbon on mechanical behavior of Fe-Mn-C system alloys

Influence of carbon on mechanical behavior of Fe-Mn-C system...

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作者： Dai, Yong Juan Mi, Zhen Li College of Materials science and engineering Hebei university of science and technology Shijiazhuang 050018 Hebei China Hebei key laboratory of material near-net forming technology Hebei university of science and technology Shijiazhuang 050018 Hebei China National Engineering Research Center for Advanced Rolling technology University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9783038351214

Fe-Mn-C alloys with different carbon content were developed as automobile sheet. Their mechanical properties were studies after hot rolled-cold rolled-different temperature annealed. It was found that carbon element effected mechanical behavior of Fe-Mn-C system alloys seriously. With carbon element increasing its deformation mechanisms turned transformation-induced plasticity (TRIP) effect into twinning-induced plasticity (TWIP) effect. Then the Fe-Mn-C alloys with different carbon content showed different mechanical behavior and different microstructure characterization. © (2014) Trans Tech Publications, Switzerland.

关键词： Manganese alloys

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Synthesis of titanium carbonitride powders by reactive ball milling of titanium, graphite and urea

Synthesis of titanium carbonitride powders by reactive ball ...

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4th International Conference on Advanced Engineering materials and technology, AEMT 2014

作者： Sun, Jin Feng Quan, Kun Sun, Ji Sheng Meng, Yong Qiang Key Lab of Material Near Net Forming Technology of Hebei Provice Shijiazhuang Hebei China College of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang Hebei China Polythechnic College of Hebei University of Science and Technology Shijiazhuang Hebei China Liaoning Light Industry Science Research Institute Shenyang Liaoning China

ISBN: (纸本)9783038352068

Titanium carbonitride (TiCN) nanocrystaline powders were syntheiszed by reactive ball milling of titanium, graphite and urea. GN-2 ball milling was used and the rotation speed was 600rpm. The ratio of ball to material was 30:1, the milling time was from 10 hours to 50 hours. The powders milled for different time were analyzed by X-ray diffraction. The results show that TiCN powders can be synthesized by milling 10 hours, although some raw materials remained. After milled for 50 hours, the raw materials can reactive completely to form TiCN and the grain size of the TiCN powder was about 7 nm. © (2014) Trans Tech Publications, Switzerland.

关键词： Urea

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