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Sun W.,Taiyuan University of Technology | Xue Y.,Taiyuan University of Technology | Xue Y.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Ren X.,Taiyuan Iron & Steel Group Co.
Emerging Economies, Risk and Development, and Intelligent Technology - Proceedings of the 5th International Conference on Risk Analysis and Crisis Response, RACR 2015 | Year: 2015

With the rapid development of Coal-Bed Methane (CBM) industry, ecological environment has been seriously destroyed. The assessment of ecological risk becomes increasingly significant. Therefore, the paper firstly defines the concept of ecological risk based on the industrialization development of CBM from the perspective of disaster system theory. And then, it analyzes the influencing factors according to the logical frame of hazard-induced Environment (E), Caused-hazards (C), hazard-affected Bodies (B) and disaster Losses (L). Besides, the paper constructs the index system of ecological risk assessment. Most importantly, it lays the basis for further research to construct quantified models of ecological risk based on the industrialization development of CBM. © 2015 Taylor & Francis Group, London. Source

Yu J.M.,North University of China | Li X.B.,North University of China | Zhang Z.M.,North University of China | Wang Q.,North University of China | And 2 more authors.
Materials Science Forum | Year: 2016

The multi-pass hot compression deformation behavior of the cast alloy with the composition of Mg-13Gd-4Y-2Zn-0.6Zr, was investigated, and the four-pass compression tests were conducted at the temperatures ranging from 350℃ to 500℃ and strain rate 0.01 s-1. The experimental results showed that the alloys incurred different degrees of softening by multipass deformation. The microstructure evolution for the deformed alloy was investigated, the influence of the microstructure on the hardness properties of the alloy discussed. The tests reveal that dynamic recrystallization is not the main softening mechanism for this alloy; rather, kink deformation refines the grains to achieve the observed softening effect. The hardness test curve showed that the hardness increased gradually with an increasing number of deformation passes. The improvement of the main mechanical properties related to the strengthening by the grain refinement. In multipass deformation, the misorientation of the kink belt gradually increased,and refined the grains. On the other hand, the grain size of the eutectic phase at the grain boundary decreased with increase of deformation passes. In addition, the mechanical properties were improved by the distribution dispersion of tiny cuboidal particles and acicular-like phases in the matrix. © 2016 Trans Tech Publications, Switzerland. Source

Li G.-P.,Shanxi Taigang Stainless Steel Co. | Li G.-P.,Taiyuan Iron & Steel Group Co. | Pei H.-X.,Shanxi Taigang Stainless Steel Co. | Li J.-C.,Shanxi Taigang Stainless Steel Co. | Zhang S.-L.,Shanxi Taigang Stainless Steel Co.
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2016

The precipitation behavior of σ phases in W-containing S32760 super duplex stainless steel was studied by aging treatment experiments. The morphology and chemical composition of the σ phases were investigated by scanning electron microscopy and transmission electron microscopy. The effects of the σ phases on the mechanical properties and corrosion resistance of the stainless steel were analyzed additionally. The σ phases composed of Fe-Cr-Mo-W have a tetragonal structure and abundantly precipitate at 850-1000℃ in the stainless steel with quite high strength and hardness and extremely poor plasticity, for example, the elongation is lower than 4.0%. There are still a few of σ phases at 1050℃, though the elongation increases to 31.1%, the values of impact toughness are discrete, and the average impact energy is low. Until 1080℃, the σ phases completely dissolve to the matrix. The tensile strength and the elongation are 640 MPa and 35.5%, and the longitudinal and the transverse impact energies averagely reached to 217 J and 110 J, respectively. As the treatment temperature increasing, the pitting potential (Eb) improves, and the mass loss rate of pitting corrosion decreases. The pitting potential of the stainless steel treated at 1080℃ is up to 1246 mV, while the mass loss rate decreases only to 0.005-0.007 g·m-2·h-1 when being soaked in a 3.5% NaCl solution at 50℃. © All right reserved. Source

Hao W.,Taiyuan Iron & Steel Group Co. | Xue S.,Taiyuan Iron & Steel Group Co.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

The high-temperature oxidation behaviors of GH4700 alloy were studied by means of XRD, SEM and EDS. The results indicate that the oxidation kinetics obey parabolic law in a temperature range of 800 to 900℃, and the growth of the oxide film is controlled by the diffusion of oxygen in the film; the oxidation scale formed for 100 h consists of three parts, and the addition of Nb can effectively improve the oxidation resistance properties. Copyright © 2015, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source

Hu S.,Taiyuan Iron & Steel Group Co. | Chen H.,University Of Science And Technology Liaoning | Li S.,University Of Science And Technology Liaoning | Tang G.,Beijing Institute of Technology
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Hot deformation behaviors of high carbon alloy steel 75Cr1 were investigated on Gleeble-3800 simulator at the temperature range of 800-1100 ℃ and strain rate range of 1-30 s-1. Experimental results show that the deformation resistance increases with the increase of strain rate and decrease of temperature; By using the linear regression analysis, the calculated hot deformation activation energy Qd of the 75Cr1 steel is 264 kJ/mol. Based on the stored energy evolution, the critical strain point of 75Cr1 steel was found and the expressions of dynamic recrystallization fraction XD of 75Cr1 steel were calculated under the different deformation conditions. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved. Source

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