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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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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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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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Influence of Carbon on the Stacking Fault Energy and Deformation Mechanics of Fe-Mn-C System Alloys

Influence of Carbon on the Stacking Fault Energy and Deforma...

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2014 2nd International Conference on materials Science,Machinery and Energy Engineering(MSMEE 2014)

作者： Yongjuan Dai Bo Li Haoen Ma Chi Zhang 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 Analysis and testing center Hebei university of science and technology

Fe-Mn-C alloys with different carbon content were *** was found that carbon element effected the SFE of the Fe-Mn-C alloys seriously, SFE increases with increase of carbon ***-Mn-C alloys' deformation mechanisms, with SFE increase from 9.04 m J.m to 39.99 m J.m, turn transformation-induced plasticity（TRIP） effect into twinning-induced plasticity（TWIP） effect with carbon concentration increase from 0.16% to 0.98%.

关键词： Carbon element SFE(stacking fault energy) Deformation mechanism TWIP/TRIP effect

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Effect of thread helix angle on the axial metal flow of cross wedge rolling thread shaft

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2013 International Conference on Advanced materials and Sports Equipment Design, AMSED 2013

作者： Yan, Hua Jun Wang, Li Juan Liu, Yu Zhong Li, Guo Chang Liu, Jin Ping Hu, Zheng Huan School of Materials Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-net Forming Technology Shijiazhuang 050018 China School of Management and Economics Hebei University of Science and Technology Shijiazhuang 050018 China School of Mechanical Engineering University of Science and Technology Beijing Beijing 10083 China

ISBN: (纸本)9783037859025

When rolling thread shaft in cross wedge rolling, forming quality of thread is affected by many process parameters such as the thread helix angle, which is a special and complex parameter. However, there is few study of the effect of the thread helix angle on thread shaft forming. In this paper how thread helix angle affects axial metal flow was analyzed from the perspective of rolling force and the forming process of thread shaft was simulated with different helix angles by the deform-3D software. Through the measurement of the point coordinates, the effect of the helix angle on the axial metal flow of rolled pieces was analyzed. Finally, the conclusion was obtained that helix angle causes the asymmetry of axial metal flow with small difference values for asymmetry and the axial metal flow of rolled pieces increases as the helix angle increases. The rolling thread segment can be ensured in the middle of rolled pieces by moving the blank a suitable distance in the reverse direction of the axial flow direction. © (2014) Trans Tech Publications, Switzerland.

关键词： Thread rolling

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Effect of Thread Helix Angle on the Axial Metal Flow of Cross Wedge Rolling Thread Shaft

Effect of Thread Helix Angle on the Axial Metal Flow of Cros...

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2013 International Conference on Advanced materials & Sports Equipment Design(AMSED 2013)

作者： Huajun Yan Lijuan Wang Yuzhong Liu Guochang Li Jinping Liu Zhenghuan Hu School of Materials Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-net Forming Technology School of Management and Economics Hebei University of Science and Technology School of Mechanical Engineering University of Science and Technology Beijing

关键词： Cross wedge rolling Thread shafts Helix angle Metal flow

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