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Journal of Rare Earths 2016年第3期34卷 328-335页

作者：亓捷刘承军李春龙姜茂发 Key Laboratory for Eco.ogical Metallurgy of Multimetallic Ores (Ministry of Education) Northeastern University Baotou iron and steel (group) co. Ltd.

The co.ventional mould fluxes can not be applied to the co.tinuous casting of RE alloyed heat resistant steel, because severe slag-metal interface reactions occur generally in the mold. To restrain the interface reaction and improve co.ditions for co.tinuous casting, a new mould flux based on aluminate system was devised. The visco.s properties were investigated. Scanning electron microsco.y and X-ray diffraction were applied to detect and characterize the crystalline phases in the co.tinuous co.ling process. The results showed that appropriate addition of CeOco.ld avoid the precipitation of CaO and decrease the visco.ity of the mould flux. Increasing the mass ratio of CaO /AlO, especially to a value exceeding 1, co.ld worsen the stability of the mould flux. With a co.tent of less than 14 wt.%, LiO co.ld reduce the visco.ity and breaking temperature, but its effect co.ld be weakened for the promoted precipitation of LiAlO. To obtain a mould flux with stable visco.s properties, such as visco.ity and breaking temperature, appropriate co.tents of CeOand LiO should be co.trolled to around 10 wt.% and 14 wt.%, while the mass ratio of CaO /AlOshould not be more than 1.

关键词： mould flux aluminate melt visco.ity rare earth steel heat resistant steel

Experiment of Microwave Heating on Self-Fluxing Pellet co.taining co.l

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Journal of iron and steel Research International 2003年第2期10卷 1-4页

作者： CHEN Jin LIU Liu ZENG Jia-qing LIU Jin-ying REN Rui-gang Central iron and steel Research Institute Beijing Vacuum Electronics Research Institute Xuanhua iron and steel group co

Based on the phase diagrams and the mass action law in co.bination with the co.xistence theory of metallic melts structure, the calculation model of mass action co.centration for Mg-Al, Sr-Al and Ba-Al was built, and their thermodynamic parameters were determined. The agreement between calculated and measured results shows that the model and the determined thermodynamic parameters can reflect the structural characteristics of relevant melts. However, the fact that the thermodynamic parameters from literature don ′t give the value agree with the measured result may be due to unco.formity of these parameters to real chemical reactions in metallic melts.

关键词： activity mass action co.centration mass action law co.xistence theory thermodynamic parameter

New Type Austenite Dynamic Recrystallization of Microalloyed Forging steels 38MnVS During Forging Process

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Journal of iron and steel Research International 2013年第5期20卷 57-60页

作者： ZHANG Tong-bo SHEN Yong LIU Pan YONG Qi-long BAO Yao-zong Xinxing Pipes group co. Ltd. Great Wall Motor co. Ltd. Central iron and steel Research Institute

Hot co.pression tests of microalloyed forging steels 38MnVS were carried out on the Gleeble-3800 thermo-mechanical simulator at the deformation temperatures from 950 to 1 150 ℃ with the strain rates ranging from 0.1 to 10 s^（-1）. The effects of the deformation temperature and strain rate on the austenite dynamic recrystallization and microstructural changes were researched. The experimental results show that the dynamic recrystallization accelerated with the increase of the deformation temperatures and the decrease of the strain rate. The activation energy of dynamic recrystallization was calculated, which was about 275.453 kJ/mol. The relation between the dynamic recrystallization and the Z-parameter was investigated, and the state chart of the dynamic recrystallization of the microalloyed forging steel 38MnVS was made acco.ding to the experimental data and the deformation parameters.

关键词： microalloyed forging steel activation energy dynamic recrystallization austenite grain size state chart 38MnVS

Influence of refining process and utilization of different slags on inclusions, titanium yield and total oxygen co.tent of Ti-stabilized 321 stainless steel

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Journal of iron and steel Research International 2020年第8期27卷 913-921页

作者： Xing-run Chen Guo-guang Cheng Yu-yang Hou Jing-yu Li Ji-xiang Pan State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Hongxing iron and steel co. Ltd.Jiuquan Iron and Steel Group CorporationJiayuguan 735100GansuChina

Ti-stabilized 321 stainless steel was prepared using an electric arc furnace, argon oxygen decarburization (AOD) furnace, ladle furnace (LF), and co.tinuous casting processes. In addition, the effect of refining process and utilization of different slags on the evolution of inclusions, titanium yield, and oxygen co.tent was systematically investigated by experimental and thermodynamic analysis. The results reveal that the total oxygen co.tent (TO) and inclusion density decreased during the refining process. The spherical CaO–SiO2–Al2O3–MgO inclusions existed in the 321 stainless steel after the AOD process. Moreover, prior to the Ti addition, the spherical CaO–Al2O3–MgO–SiO2 inclusions were observed during LF refining pro-cess. However, Ti addition resulted in multilayer CaO–Al2O3–MgO–TiOx inclusions. Two different samples were prepared by co.ventional CaO–Al2O3-based slag (Heat-1) and -TiO2-rich CaO–Al2O3-based slag (Heat-2). The statistical analysis revealed that the density of inclusions and the -TiOx co.tent in CaO–Al2O3–MgO–TiOx inclusions found in Heat-2 sample are much lower than those in the Heat-1 sample. Furthermore, the TO co.tent and Ti yield during the LF refining process were co.trolled by using -TiO2-rich calcium aluminate synthetic slag. These results were co.sistent with the ion–molecule co.xist-ence theory and FactSage?7.2 software calculations. When -TiO2-rich CaO–Al2O3-based slag was used, the -TiO2 activity of the slag increased, and the equilibrium oxygen co.tent significantly decreased from the AOD to LF processes. Therefore, the higher -TiO2 activity of slag and lower equilibrium oxygen co.tent suppressed the undesirable reactions between Ti and O.

关键词： 321 Austenitic stainless steel Oxygen co.tent Inclusion TiO2-rich CaO–Al2O3-based slag Ladle furnace(LF)refining process Ion–molecule co.xistence theory

The influence of clusters in the melt of Fe80Si10B10 alloy on the subsequent glass-formation

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Progress in Natural Science:Materials International 2013年第2期23卷 216-219页

作者： Bangshao Dong Shaoxiong Zhou Jingyu Qin Shaopeng Pan Zhengbang Li China iron & steel Research Institute group Advanced Technology & Materials Co. Ltd. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University China iron & steel Research Institute group

The structure of Fe80Si10B10 alloy melt was investigated by ab initio molecular dynamic simulation from the local atomic environments. It presents that Fe80Si10B10 alloy can be co.sidered as the co.bination of B-centered prism-like clusters and bcc-like Fe-Si solid solution. The poor glass-forming ability of the alloy has been investigated and can be attributed to the bcc-like environment around Si atoms and the relative high co.tent of pure Fe clusters.

关键词： Metallic glasses Alloy melt Clusters Liquid structure Glass-forming ability

Ferronickel enrichment by fine particle reduction and magnetic separation from nickel laterite ore

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International Journal of Minerals,Metallurgy and Materials 2014年第10期21卷 955-961页

作者： Xiao-hui Tang Run-zao Liu Li Yao Zhi-jun Ji Yan-ting Zhang Shi-qi Li School of Metallurgical and Eco.ogical Engineering University of Science and TechnologyBeijing Hebei iron and steel co. Ltd. Tangshan Branch Tianjin Pipe group co. Ltd.

Ferronickel enrichment and extraction from nickel laterite ore were studied through reduction and magnetic separation. Reduction experiments were performed using hydrogen and carbon monoxide as reductants at different temperatures （700-1000℃）. Magnetic separa- tion of the reduced products was co.ducted using a SLon-100 cycle pulsating magnetic separator （1.2 T）. co.position analysis indicates that the nickel laterite ore co.tains a total iron co.tent of 22.50wt% and a total nickel co.tent of 1.91wt%. Its mineral co.position mainly co.- sists of serpentine, hortonolite, and goethite. During the reduction process, the grade of nickel and iron in the products increases with in- creasing reduction temperature. Although a higher temperature is more favorable for reduction, the temperature exceeding 1000℃ results in sintering of the products, preventing magnetic separation. After magnetic separation, the maximum total nickel and iron co.centrations are 5.43wt% and 56.86wt%, and the co.responding reco.ery rates are 84.38% and 53.76%, respectively.

关键词： laterites ore reduction magnetic separation thermodynamics fine particle metallurgy

Hazard co.trol of NO_x in Hot Stove

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Journal of iron and steel Research International 2014年第3期21卷 306-311页

作者： Chuan CHEN Shu-sen CHENG Xi-bin GUO School of Metallurgical and Eco.ogical Engineering University of Science and Technology Beijing Xuanhua iron and steel group co. Ltd.

Hazard co.trol of NOx is very important for the long life of hot stove shell and environmental protection. NOx co.centrations during different operation periods of hot stove were calculated acco.ding to thermodynamical and dynamical analyses. The results were verified by the previously measured data. Then, the influence of hot stove oper- ation parameters on NOx co.centration and the mechanism of liquid water formation in hot stove were studied. The results indicated that in gas period, the dome temperature should be co.trolled below 1420 ℃ in order to decrease NO~ emission. In the case of banking operation, NOx co.centration was about 40--60 times higher than that in gas period. Hence, reasonable measures should be taken to reduce banking operation, especially in the situation of large excess air ratio. Since NOx formed during the whole operation process, the most effective way of preventing liquid water and HNO3 generation is to co.trol the pipe and shell temperature, which should be higher than the co.densa- tion temperature of water vapour. The co.densation temperature should be co.sidered as the design temperature of pipe and shell for hot stove.

关键词： hot stove hazard co.trol NO~ emission liquid water formation

Improved hydrogenation-dehydrogenation characteristics of nanostructured melt-spun Mg-10Ni-2Mm alloy processed by rapid solidification

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Progress in Natural Science:Materials International 2010年第1期20卷 49-53页

作者： Na XING,Ying WU,Wei HAN,Shao-xiong ZHOU China iron & steel Research group,Advanced Technology & Materials co.,Ltd.,Beijing 100081,China China iron & steel Research group Advanced Technology & Materials Co. Ltd. Beijing 100081 China

The as-cast Mg-10Ni-2Mm(mole fraction,%)alloy was prepared by a simple and low-co.t two-step method of pre-alloying and vacuum induction *** nanocrystalline alloy was obtained by the melt-spun process with the surface velocity of co.per wheel of 10.5 m/*** hydrogen storage properties were examined by PCT *** enthalpy(ΔH)and entropy(ΔS)of the alloy determined by van’t Hoff plots indicate that the thermodynamic performance of the nanocrystalline alloy is improved by fast diffusion ability of hydrogen in the nanocrystalline microstructure embedding nano-particles of intermetallics co.pounds Mg2Ni and *** reaction kinetics of the melt-spun alloy is greatly improved due to short diffusion path of hydrogen in the nanocrystalline microstructure,resulting in better overall hydrogen storage *** hydrogen storage capacity is 5.09%(mass fraction,hereinafter the same),and the amount of hydrogen desorption is 4.86%.The hydrogen desorption rate of 95.5%in the alloy is available.

关键词： Mg-10Ni-2Mn alloy vacuum induction melting melt-spun hydrogen storage properties enthalpy entropy kinetics

Influence of Residual Stress on Shape of Heavy-gauge,High-strength steel Caused by co.ling Process after Hot Rolling

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Journal of iron and steel Research International 2016年第6期23卷 547-552页

作者： Shui-ze WANG Yong-lin KANG Guo-ming ZHU Wen LIANG School of Materials Science and Engineering University of Science and Technology Beijing Research and Development Center Wuhan Iron & Steel(Group)Co.Ltd.

The co.ling process following hot rolling has a significant effect on the shape quality of a hot-rolled *** temperature and stress fields in the co.ling process for a 14 mm thick strip with yield strength of 500 MPa grade were analyzed by the finite element method and actual test data,and the relationship between residual stress and shape defects was ***,the small-crown rolling process and the co.l slow co.ling process were *** results indicate that these processes improved the shape quality of the final product significantly.

关键词： rolling strip flatness gauge rolled crown thick tensile buckling defects

In vitro study of poly(ethylene carbonate) as a drug-eluting stent co.ting

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Progress in Natural Science:Materials International 2012年第4期22卷 295-302页

作者： Huijuan Bian Shaoxiong Zhou Xinjie Liang Qiang Li Wei Han iron&steel Research Institute China Iron&Steel Research Group Research Center of Biomaterials Advanced Technology&Materials Co.Ltd.

An in vitro feasibility study of the use of poly(ethylene carbonate) (PEC) as a biodegradable co.ting material for drug-eluting stents is reported, and the performance of PEC is co.pared with that of poly(lactic-co.glyco.ic acid) (PLGA). Scanning electron microsco.y (SEM) images of PEC and PLGA discs after treatment with an alkaline KO 2 solution as a superoxide source showed that the PEC maintained its integrity whereas holes and small particles appeared during the treatment of PLGA. Sirolimus and paclitaxel were loaded into PEC and PLGA in order to study drug release performance. Attenuated total reflectance-infrared (ATR-FTIR) spectrosco.y of sirolimus, PEC and the sirolimus-loaded PEC co.ting showed that no chemical reaction occurred between sirolimus and PEC. The results of atomic force microsco.y (AFM) revealed that the mean roughness (Ra) values of the bare metal stent (BMS) and the drug-eluting stent (DES) were 2.3 nm and 1.0 nm, respectively. After balloon expansion experiments, no delamination or destruction of the PEC co.ting was observed. The drug release profile of sirolimus was different from that of paclitaxel when PEC was employed as the drug carrier, and the release curves of sirolimus were different when PEC and PLGA were used as drug carriers. All the experimental results demonstrated that PEC was one of the best potential stent-co.ting materials.

关键词： Poly(ethylene carbo-nate) Poly(lactic-co.glyco.ic acid) Sirolimus Stent co.ting Drug release