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Wang B.,Northwest Institute for Nonferrous Metal Research
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

Hot tube extrusion process of Inconel 690 alloy was investigated by simulation and experiments. The results show that temperature of the billet increases greatly with the extrusion speed increasing. The extrusion force first decreases and then increase. The extrusion force decreases linearly with the heating temperature increasing. For the situation of radial temperature gradient existing on the tube, it can be found that the initial inhomogeneous tube temperature distribution affects the alloy flow seriously during the hot tube extrusion process which leads to some defects on the surface. Based on the simulation results, the hot extrusion process is designed to obtain the qualified superalloy tube successfully. ©, 2015, Science Press. All right reserved.


Lin C.,Liaoning University of Technology | Zhao Y.,Northwest Institute for Nonferrous Metal Research | Yin G.,Liaoning University of Technology
Computational Materials Science | Year: 2014

This article describes a novel calculation method for the lattice constant of solids based on the empirical electron theory (EET) of solids and molecules. This calculation is achieved by introducing the iterative self-consistent method into the bond length difference (BLD) method of EET, called as the self-consistent bond length difference (SCBLD) method. The calculation accuracy of lattice constants with SCBLD method is first evaluated. Moreover, the calculation results in the present article are also compared with the ones calculated with the first principles methods (e.g., SOGGA, PBEsol, WC, AM05, TPSS, PBE) in terms of a set of statistical quantities. The results reveal that SCBLD method can exhibit the excellent calculation accuracy in lattice constants. ©2014 Elsevier B.V. All rights reserved.


Lin C.,Liaoning University of Technology | Yin G.,Liaoning University of Technology | Zhao Y.,Northwest Institute for Nonferrous Metal Research
Computational Materials Science | Year: 2015

This article describes a new calculation method for the cohesive energy of pure crystals by introducing the self-consistent bond length difference (SCBLD) into the empirical electron theory (EET) of solids and molecules. The computational accuracy of cohesive energy for 44 solids is evaluated in terms of a set of statistical quantities. The results show that the calculation method in the present paper can exhibit the excellent calculation accuracy in cohesive energy, demonstrated by the mean absolute relative errors (MARE in percent) of 2.34%. ©2015 Elsevier B.V. All rights reserved.


Zheng Y.-J.,Central South University | Chen K.-K.,Northwest Institute for Nonferrous Metal Research
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

The leaching kinetics of selenium from selenium-tellurium-rich materials in sodium sulfite solutions was studied. The morphologies of selenium-tellurium- rich materials are mainly spheroid and columnar bodies and the range of particle size of selenium-tellurium-rich materials is between 17.77 μm and 56.58 μm, which contain 41.73% selenium and 40.96% tellurium. The ranges of experimental elements are 126-315 g/L of sodium sulfite concentration, 100-400 r/min of agitation speed, 23-95 °C of reaction temperature, 7:1-14:1 of liquid-solid ratio and 17.77-56.58 μm of average particle size. The results show that the leaching rate increases with increasing the sodium sulfite concentration, agitation speed, reaction temperature or liquid-solid ratio and the leaching rate decreases with increasing the particle size. The reaction temperature has the significant effects on the selenium leaching rate which increases from 21% to 67% with increasing temperature from 23 °C to 95 °C. The experimental data agree quite well with the Avrami model for leaching, with model parameter of 0.235 and apparent activation energy of 20.847 kJ/mol. © 2014 The Nonferrous Metals Society of China.


Canyang L.,Northwest Institute for Nonferrous Metal Research
Proceedings - 2015 7th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2015 | Year: 2015

Groundwater has an important influence to landslide stability, therefore, how to effectively drain off the groundwater from large-scale landslide have always been a hot research topic, this paper, first of all, summarizes conventional slope drainage measures and their respective serviceability, then carries out computational analysis, it puts forth drainage tunnel can effectively lower the water level and increase landslide safety factor, on the ground of detailed geological investigation and theoretical analysis, drainage tunnel was successfully applied to the treatment of some large-scale landslide, results showed that the drainage effects was much more better than expected, this effectively guaranteed landslide's stability and treatment effects, hence, drainage tunnel is a good way to descend water level. © 2015 IEEE.

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