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Study of the Microstructure and Properties of ER70S-6 Wire Rods

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Journal of iron and Steel research International 2011年第S1期18卷 929-932页

作者： HUANG Zhi-jun,WANG Yu-tao,XIONG Yan (Products research Institute,R and D center of wuhan iron and Steel (Group) Corporation,wuhan 430080,hubei,china) wuhan iron & Steel Grp Corp R&D Ctr Prod Res Inst Wuhan 430080 Hubei Peoples R China

After rolling even after drawing,a fraction of martensite may occur in the microstructure of ER70S-6 wire deteriorating the ductility and drawing *** mid-products of drawing for test were heat treated at 350℃ and 500℃,deformed ferrite plus pearlite plus some unchanged martensite and deformed ferrite plus pearlite plus troostite were obtained *** bending test was carried out on both as-drawn and heat-treated *** results showed that the brittleness of the as-drawn rods is not due to defects but due to the presence of martensite in *** sample heat-treated at 500℃ and cooled in oven has the best ductility.

关键词： ER70S-6 microstructure heat treatment ductility

Numerical Simulation on Optimization of CSP Tundish Flow Field

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Journal of iron and Steel research International 2011年第S2期18卷 263-267页

作者： ZHANG Jian-jun, GAO Wen-fang, PENG Zhu-gang, CAO Tong-you (research and development Centre of wuhan iron and Steel (Group)Co., wuhan 430080, hubei, china) wuhan iron & Steel Grp Co Ctr Res & Dev Wuhan 430080 Hubei Peoples R China

Original scheme and optimizing scheme of WISCO CSP tundish have been simulated by software FLUENT. Flow field and temperature field of different schemes have been analyzed. The results which have been proved by hydraulic model experiments are the same with that of numerical simulation. It shows that the dead volume Vd of optimizing scheme decreases to 11.37%, reduced by 67.8% compared with the original scheme. The average residence time Ta of optimizing scheme increases to 639.2s, increased by 172.5s compared with the original scheme. The optimized scheme favors homogenous temperature distribution, more reasonable flow field and inclusions removing in the tundish. It is more adaptive to CSP plant of WISCO compared with the original scheme.

关键词： CSP tundish numerical simulation hydraulic model

Effect of Nb,Mo and Ti on the Microstructures and Mechanical Properties of 700MPa Weathering Steel

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Journal of iron and Steel research International 2011年第S1期18卷 300-305页

作者： WANG Bing 1,SONG Yu-lai 2,WEN Xiao-ming 3,WANG Hou-xin 4,LIU Qing-you 1 (1.Institute for Structural Materials of CISRI,Beijing 100081,china 2.research and development center of wuhan iron and Steel (Group) Corp.,wuhan 430080,hubei,china 3.Benxi iron and Steel Group Limited Company Benxi 117000,Liaoning,china 4.CITIC-CBMM Microalloying Technology center,Beijing 100081,china) Inst Struct Mat CISRI Beijing 100081 Peoples R China wuhan iron & Steel Grp Corp Ctr Res & Dev Wuhan 430080 Hubei Peoples R China Benxi iron & Steel Grp Ltd Co Benxi 117000 Liaoning Peoples R China CITIC CBMM Microalloying Technol Ctr Beijing 100081 Peoples R China

Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness,tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weathering steel was studied under the same rolling *** results show the formation of M/A is promoted by Mo,while inhibited by ***,M/A island,as a hard phase,is harm to the material toughness and plasticity;high M/A island fraction will result in obvious crack during cold *** effect of Nb on increasing the strength of experiment steel is very *** Nb content of 700MPa steel must be higher than 0.05% to ensure the *** optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,Mo and *** industry trial production of 700MPa high-strength weathering steel for container was also developed.

关键词： weathering steel Nb Mo Ti mechanical properties M/A island

development of 600MPa High Aluminum Cold Rolled Dual Phase Steel and Its Application

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Journal of iron and Steel research International 2011年第S1期18卷 994-998页

作者： WANG Hui 1,2,LIN Cheng-jiang 1,DENG Zhao-jun 1,GONG Tao 1,TAN Yun-gang 2,YAN Fei 2,YANG Peng 2 (1.research and development center,WISCO,wuhan 430080,hubei,china 2.Cold Rolling Mill,WISCO,wuhan 430081,hubei,china) WISCO Ctr Res & Dev Wuhan 430080 Hubei Peoples R China WISCO Cold Rolling Mill Wuhan 430081 Hubei Peoples R China

An original 600MPa high aluminum dual phase steel had been successfully developed in this *** microstructure analysis showed that the microstructures of the steel mainly consist of ferrite and 16% martensite which distributed around the ferrite grain *** analysis demonstrated that there exist lots of high density dislocations in ferrite as well as an obvious twin-structure and some ribbon structures in *** tensile test and the bake-hardening test showed that the steel delivers an excellent mechanical properties of R p0.2 =350-390MPa,R m =620-660MPa,R p0.2 /R m =0.55-0.65,A 80mm =25-29%,n=0.18-0.21 and an excellent bake-hardening property of BH 2 =50-60MPa as well as an excellent of work-hardening (WH) property of WH=120MPa。The spot-welding test showed that this dual phase steel has a good welding *** to the excellent formability,the steel has been successfully used in the production of some auto parts.

关键词： dual phase steel martensite high density dislocation bake hardening welding property

A simple lattice Boltzmann scheme for low Mach number reactive flows

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Science china(Technological Sciences) 2006年第6期49卷 714-726页

作者： CHEN Sheng1,2, LIU Zhaohui2, ZHANG Chao2, HE Zhu2, TIAN Zhiwei2, SHI Baochang 2 & ZHENG Chuguang2 1. Technology center of wuhan iron and Steel (Group) Company, wuhan 430080, china 2. State Key Laboratory of Coal Combustion, Hua Zhong University of Science and Technology, wuhan 430074, china Technology center of wuhan iron Steel [Group] Company Wuhan 430080 China State Key Laboratory of Coal Combustion Hua Zhong University of Science Technology Wuhan 430074 China

For simulating low Mach number reactive flows, a simple and coupled lattice Boltzmann (CLB) scheme is proposed, by which the fluid density can bear significant changes. Different from the existing hybrid lattice Boltzmann (HLB) scheme and non-coupled lattice Boltzmann (NCLB) scheme, this scheme is strictly lattice Boltzmann style and the fluid density couples directly with the temperature. Because it has got rid of the constraint of traditional thought in lattice Boltzmann scheme,on the basis of the equality among the particle speed c, the time step △t and the lattice grid spacing △x held, both c and △t can be adjusted in this scheme according to a "characteristic temperature" instead of the local temperature. The whole algorithm becomes more stable and efficient besides inheriting the intrinsically outstanding strong points of conventional lattice Boltz-mann scheme. In this scheme, we also take into account different molecular weights of species, so it is more suitable for simulating actual low Mach number reactive flows than previous work. In this paper, we simulated a so-called "counter-flow" premixed propane-air flame, and the results got by our scheme are much better than that obtained by NCLB. And the more important thing is that the exploration in this work has offered a kind of brand-new train of thought for building other novel lattice Boltzmann scheme in the future.

关键词： lattice Boltzmann, low Mach number flows, reactive flows, simulation.

HCWCI/Carbon Steel Bimetal Liner by Liquid-Liquid Compound Lost Foam Casting

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Journal of iron and Steel research International 2012年第10期19卷 13-19页

作者： XIAO Xiao-feng1,2, YE Sheng-ping2, YIN Wei-xin3, XUE Qiong4 (1. School of Mechanical Engineering and Automation, wuhan Textile University, wuhan 430073, hubei, china 2. State Key Laboratory of Material Processing and Die and Mould Technology, Huazhong University of Science and Technology, wuhan 430074, hubei, china 3. wuhan Zhike Abrasive-Resistant Material Science and Technology development Co Ltd, wuhan 430073, hubei, china 4. College of Science, wuhan University of Technology, wuhan 430079, hubei, china) [a] School of Mechanical Engineering and Automation Wuhan Textile University Wuhan 430073 Hubei China [b] State Key Laboratory of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 Hubei China [c] wuhan Zhike Abrasive-Resistant Material Science and Technology development Co Ltd Wuhan 430073 Hubei China [d] College of Science Wuhan University of Technology Wuhan 430079 Hubei China

Impact, friction and corrosion from the grinding balls and the grinding medium during the mineral processing result in liner breakage. Liner, made from Hadfield steel or alloyed steel, could not have served in wet grinding environment for more than ten months. Composite liner, made from HCWCI (high Cr white cast iron) and carbon steel, has been developed successfully with liquid-liquid composing process based on LFC (lost foam casting). The microstructure of composite was analyzed with optical microscope, SEM (scanning electron microscope)/EDX energy-dispersive X-ray and XRD (X-ray diffraction). According to micrograph, the combination region of two metals was staggered like dogtooth, no mixtures occurred between two liquid metals, and its interface presented excellent metallurgical bonding state. The results of mechanical property test show that, the hardness of HRC, the fracture toughness, and the bending strength are more than 61, 16.5 J/cm2 and 1 600 MPa, respectively. Comparison between liners made from bimetal composite and alloyed steel has also been investigated in industrial hematite ball mill. The results of eight months test in wet grinding environment prove that the service life of bimetal composite liner is three times as long as that of one made from alloyed steel.

关键词： composite liner bimetal liquid-liquid compound composite interface lost foam casting high Cr white cast iron

推进深港合作打造世界级“高教-科创-人才”枢纽的战略思考

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中国软科学 2024年第10期 1-9页

作者：武汉大学国家发展战略研究院课题组武汉大学国家发展战略研究院湖北武汉430072

深圳和香港地区是粤港澳大湾区建设国际科技创新中心和综合性国家科学中心的两个核心引擎,两地优势互补、珠联壁合。深港合作打造世界级“高教-科创-人才”枢纽,有利于建设全球科创高地,推动高质量发展。首先,要发挥香港“超级联系人”... 详细信息

深圳和香港地区是粤港澳大湾区建设国际科技创新中心和综合性国家科学中心的两个核心引擎,两地优势互补、珠联壁合。深港合作打造世界级“高教-科创-人才”枢纽,有利于建设全球科创高地,推动高质量发展。首先,要发挥香港“超级联系人”作用,依托香港优质高校资源,强化深港两地教育和人才的深度合作与高效协同,形成国际化人才吸附与培养的“磁场效应”,打造世界级优质“高等教育枢纽”;其次,要深化两地科技与金融合作,强化企业在促进深港协同创新中的重要作用,优化“深圳科创+香港创科”的成果转化衔接机制,打造“创投-创新-创业”铁三角,营造具有全球竞争力的创新创业生态和创富环境,形成“创新-创业-创富”的“金三角”;最后,要抓住河套科技创新合作区这个深港“强强联合”的关键着力点,形成“一核多极、多层联动”格局,促进制度型开放和规则衔接,把深港的“制度之异”变成“制度之利”,促进各类先进生产要素向发展新质生产力集聚。

关键词：深港合作高等教育创新人才科技金融产业创新河套深港科技创新合作区

Study of Burden Distribution Control Based on Infrared Image Pattern Recognition and Case-Based Inference

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Study of Burden Distribution Control Based on Infrared Image...

Evaluation of a Novel Bioabsorbable PRGD/PDLLA/β-TCP/NGF Composites in Repair of Peripheral Nerves

第五届国际炼铁科技大会

作者： L K Chen (research & development center wuhan iron & Steel Corporation wuhan 430080 china)

Burden and top gas distribution is very important for the operation of blast furnace. In order to control the burden distribution, a model to estimate top gas distribution has been developed based on infrared image pattern recognition. Some cases for burden distribution control are investigated in accordance with the theory of case-based inference and experiences obtained in the condition of change of burden distribution. After that, some new rules have been added into the knowledge base of the expert system of No.1 BF at WISCO. Practice has showed that the model of top gas distribution can be used to control the burden distribution in great extent with good operating results.

关键词： blast furnace image processing top gas control case-based inference burden distribution control

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Journal of wuhan University of Technology(Materials Science) 2009年第3期24卷 409-414页

作者：王永红李世普 Hospital Wuhan University of Technology Biomedical Materials and Engineering research center Wuhan University of Technology

Peripheral nerve regeneration using a novel nerve conduit （PRGD/PDLLA/β TCP/NGF） was evaluated, which was made of RGD peptide modified poly{（lactic acid）-co-[（glycolic acid）-alt-（L-lysine）]} （PRGD）, poly（d,l-lactic acid）（PDLLA） and β-tricalcium phosphate （β-TCP）. And the effectiveness was compared with that of PRGD/PDLLA/β-TCP, PDLLA and autograft in terms of nerve regeneration across a gap. Both of biodegradablity and cell-biocompatibility of the novel nerve conduit were evaluated in vitro. The results show that PRGD/PDLLA/β-TCP/NGF composite ma terials have better biodegradation properties and cell affinity than PDLLA, and could promote the RSC96 Schwann cells adhesion, proliferation and growth on the surface of materials. PRGD/PDLLA/ β-TCP/NGF composite conduit was significantly superior to that of the PDLLA conduit in histological and axon morphologic index. PRGD/PDLLA/β-TCP/NGF conduit is more beneficial to nerve regeneration than PDLLA conduit. The biodegradable PDLLA/PRGD/β-TCP/NGF conduit has a good biocompatibility with rats tissue and it could effectively promote the nerve regeneration after bridging sciatic nerve defect of rats, the effect is as good as that of the autograft nerve, significantly superior to the PRGD/PDLLA/β-TCP conduit and PDLLA conduit. PDLLA/PRGD/β-TCP/NGF composite conduit is a potential ideal conduit.

关键词： peripheral nerve nerve conduit PDLLA/PRGD/β-TCP/NGF composite regeneration