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Li Y.T.,Tianjin University of Technology | Li Y.T.,Tianjin Key Laboratory for Photoelectric Display Materials and Devices | Ye J.,Tianjin University of Technology | Wang J.K.,Tianjin Motor Dies Company Ltd | And 4 more authors.
Advanced Materials Research | Year: 2011

As an advanced manufacturing technology, tailor welded blanks (TWB) not only meet different requirements of properties in different parts, but also can satisfy the requirements of weight reduction and energy conservation. 6061 aluminum alloy with the thickness of 1mm was jointed by laser beam welding technology and the microstructure of tailor-welded joints was analyzed compare to base metal. The forming and bulging property characteristics of TWB were evaluated through tensile and cupping tests. Experimental results indicated that: the weld joints contained fine equiaxed grains in the center of the weld and columnar grains and dendrites near the fusion boundary were observed to be oriented towards the center of the weld. The dendrites became smaller and thinner during the transition process from the weld fusion boundary to the center. The fracture path of the TWB tensile specimens occurred in the heat-affected zone (HAZ) with the tensile and yield strength increased while the strain hardening coefficient and elongation reduced compared to base metal. The erichsen index of TWB in the cupping test was lower than base material, which demonstrated that the bulging property of the TWB was worse than base metal. © (2011) Trans Tech Publications. Source


Song J.S.,Tianjin University of Technology | Song J.S.,Tianjin Key Laboratory for Photoelectric Display Materials and Devices | Cao F.B.,Tianjin University of Technology | Cao F.B.,Tianjin Key Laboratory for Photoelectric Display Materials and Devices | And 7 more authors.
Advanced Materials Research | Year: 2011

The cathode material Li3V2 (PO4) 3 is synthesized for Lithium Ion batteries based on wet ball-milling then high-temperature carbon-thermal sintering. We had characterized them with the measurements of XRD ray diffraction, elemental analysis and electrochemical property tests. The results show that we synthesized sample is monoclinic structure; We first synthesized the Li3V2 (PO 4)3 through the using conductive carbon, the extra conductive carbon can increase the conductivity of the material. The initial charge capacity is 126.16 mAh/g and initial efficiency is 97.84 % at room temperature, charging voltage3.0 ∼ 4.3 V,0.1 C rate charging, respectively and the surface of the material is smooth, it's grains grow better, there are excess conductive carbon even attached to the material to improve the conductivity of the material. © (2011) Trans Tech Publications. Source


Song J.,Tianjin University of Technology | Song J.,Tianjin Key Laboratory for Photoelectric Display Materials and Devices | Du D.,Tianjin University of Technology | Cui H.,Tianjin University of Technology | And 5 more authors.
Yingyong Lixue Xuebao/Chinese Journal of Applied Mechanics | Year: 2010

In this paper a bending tube extrusion processing is simulated by DEFORM-3D commercial software based on the flow velocity field control technology. By numerical simulation of the double ram extrusion (DRE), the velocity field, the material flow pattern, the extrusion loads, and the stress strain distribution are analyzed. The material flow velocity is controlled by double ram structure of extrusion die. The bending radius extruded tube is changed with speed difference of double ram. The relation curve between the bending radius and the speed difference of the double ram is provided. The analysis results indicate that this innovative process can fundamentally avoid the quality defects caused by the traditional manufacturing method, such as non-uniform wall thickness and wrinkling. It is of practical significance for improving bending tube forming quality. Source

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