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Influence of pass reduction ratio on microstructure and properties of 2205/Q235B clad steel plate

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Journal of iron and steel Research(International) 2020年第11期27卷 1284-1293页

作者： Feng-qiang Xiao Dong-po Wang Wen-bin Hu Lei Cui Zhi-ming Gao Lan-ju Zhou School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Advanced Joining technology Tianjin UniversityTianjin 300350China shandong High-tech Investment corporation Jinan 250101ShandongChina shandong iron&steel Group co. Ltd.Jinan 250101ShandongChina

2205/Q235B clad steel plates were fabricated using a thermal simulator.The metallographic microscope,scanning electron microscope,energy-dispersive spectrometer,shear test,electrochemical corrosion test and acid immersion test were used to study the influence of the pass reduction ratio on the microstructure and properties of 2205/Q235B clad steel plate.The results show that the clad steel plates had a good bonding surface when the pass reduction ratios were between 16.3%and 36.0%.There existed the mutual diffusion effect of elements near the bonding surface,which caused the long austenite strip on the side of 2205 stainless steel and the decarburization layer on the side of Q235B low-carbon steel.The transformation ofδferrite toγaustenite and the generation of the decarburization layer were promoted because of the lower pass reduction ratio.The corrosio n resista nee of 2205 duplex-phases stainless steel worse ned by the decrease in 8 ferrite con tent.The increase in the decarburization layer thickness made the shear strength of the clad steel plates reduce from 453 to 390 MPa.The potential of the decarburization layer was lower than that of 2205 stainless steel and Q235B low-carb on steel,which was easily corroded in the corrosive medium.

关键词： 2205/Q235B clad steel plate Pass reduction ratio δferrite Decarburization layer-Shear strength

Effect of Interlayers on Microstructure and Properties of 2205/Q235B Duplex Stainless steel Clad Plate

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Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 679-692页

作者： Fengqiang Xiao Dongpo Wang Wenbin Hu Lei Cui Zhiming Gao Lanju Zhou School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Advanced Joining technology Tianjin UniversityTianjin 300350China shandong High-tech Investment corporation Jinan 250101China shandong iron&steel Group co. LTDJinan 250101China

In this research,2205/Q235 B clad plates were prepared by a vacuum hot rolling composite process.The effects of adding Fe,Ni,and Nb interlayers on the bonding interface structures and the shear strengths of the clad steel plates were studied.The results showed that 2205 duplex stainless steel and the three interlayers produced a large amount of plastic deformation and low-angle boundaries,and the main structures were the recrystallized and deformed grains.There were many recrystallized grains in the microstructure of the Q235 B low-carbon steel due to the low deformation in the rolling process.The Fe interlayer had better wettability with the two kinds of steel,but the lower strength led to the reduction of shear strength by about14 MPa compared with the original clad steel plate.The C element in the Q235 B low-carbon steel easily diffused into the Fe interlayer,and the clad steel plate attained a poor corrosion resistance because a large decarburization area was formed.The Nb interlayer reacted with the Mo element in the 2205 duplex stainless steel to form an Nb-Mo binary alloy,which generated long-banded ferrite.The decarburization area was also produced because the Nb reacted with the C element in the Q235 B to form hard and brittle NbCx.As a result,the shear strength was significantly reduced by about 282 MPa,and the corrosion resistance of the bonding surface was deteriorated.The Ni interlayer did not react with the alloy elements in both sides,and therefore effectively prevented element diffusion and improved the corrosion resistance of the bonding surface.Due to the low strength of the Ni interlayer and the increased number of bonding surfaces of the clad steel plates,the shear strength was reduced to some extent(about 40 MPa),but it still met the engineering application standards.

关键词： 2205/Q235B clad steel plate Fe interlayer Ni interlayer Nb interlayer Decarburization area Shear strength

Banded Microstructure Formation and Its Effect on the Performance of 06Ni9 steel

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Journal of iron and steel Research(International) 2011年第S1期18卷 325-330页

作者： LIU Dong-feng 1,2,WANG Zheng-guo 1,WEI Ying-hui 1,CUI Tian-xie 2,PAN Qi-fa 2,HOU Li-feng 1 (1.School of Material Science and Engineering,Taiyuan University of technology,Taiyuan 030024,Shanxi,China 2.technical Center,Taiyuan iron and steel Group co ltd,Taiyuan 030024,Shanxi,China) Taiyuan Univ technol Sch Mat Sci & Engn Taiyuan 030024 Shanxi Peoples R China Taiyuan iron & steel Grp co ltd Ctr Tech Taiyuan 030024 Shanxi Peoples R China

Focusing on the banded microstructure formed during the production of 06Ni9 steels for cryo-LNG,this paper examines its formation,distribution of alloying elements,structure,hardness,and low-temperature property.The results show that the banded microstructure formed after hot-rolling and cooling of the steel binct in which the element segregation occurred during solidification.The phase change during heat treatment also can cause the formation of the banded microstructure of 06Ni9 steel.The white bands are mainly composed of ferrite and reversed austenite,and the black bands are mainly composed of reversed austenite and a certain amount of ferrite.Element segregation and formation of more carbide caused some black regions to appear.Grain refinement of 06Ni9steel is beneficial to the formation of reversed austenite,the redistribution of alloying elements,improving the stability of austenite and the low-temperature toughness of steel.This steel easily undergoes nickel segregation;thus,undergoing a secondary quenching and tempering process is recommended.The refinement of martensite quenching above A c3,the martensite that is rich in nickel and carbon,residual austenite and a few little of ferrite after secondary quenching lower than A c3 are beneficial to the formation of high stability austenite.Thus,this can meet the strength and toughness requirement of the low temperature 06Ni9 steel.

关键词： 06Ni9 steel banded microstructure reversed austenite

Flatness and Profile Integration control Model for Tandem cold Mills

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Journal of iron and steel Research(International) 2012年第3期19卷 31-37页

作者： SHAN Xiu-ying1,2,3, LIU Hong-min1,2, JIA Chun-yu1,2, SUN Jian-liang1,2 (1. Engineering Research Center of Rolling Equipment and complete technology of Ministry of Education, Yanshan University, Qinhuangdao 066004, Hebei, China 2. State Key Laboratory of Metastable Materials Science and technology, Yanshan University, Qinhuangdao 066004, Hebei, China 3. Hot Tandem Rolling Factory, Jinan iron and steel co ltd, Jinan 250101, shandong, China) Engineering Research Center of Rolling Equipment and complete technology of Ministry of Education Yanshan University Qinhuangdao Hebei China State Key Laboratory of Metastable Materials Science and technology Yanshan University Qinhuangdao Hebei China Hot Tandem Rolling Factory Jinan Iron and Steel Co Ltd Jinan Shandong China

Using the effective matrix methods of flatness and profile control synthetically, the flatness and profile in- tegration control scheme for tandem cold mills is built in order to increase flatness and profile control precision of tan- dem cold mills. corresponding control strategies are adopted for various control objectives of different stands and the coordination control strategies of various stands are given, which makes the on-line flatness control cooperate with on-line profile control and implements the parallel control of different stands. According to the measured flatness and profile data of some 1550 mm tandem cold mills, the control scheme is verified and the result indicates that the scheme has high flatness and profile control precision with steady and reliable control process. A new way and method is supplied for researching shade control of tandem cold mills.

关键词： flatness profile shape effective matrix tandem cold mill

Effects of Rolling Processes on Bainite and Mechanical Properties of Ultra-High Strength Pipeline steel

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Journal of iron and steel Research(International) 2011年第S1期18卷 629-632页

作者： ZHANG Kai 1,ZHAO Yu 2,QIU Chun-lin 1,LI Si-jun 3,DU Lin-xiu 1,WU Di 1 (1.State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110004,Liaoning,China 2.School of Materials,Shenyang University of technology,Shenyang 110870,Liaoning,China 3.The technology Research and Development Center of Laiwu iron and steel Group co ltd,Laiwu 271104,shandong,China) Northeastern Univ State Key Lab Rolling & Automat Shenyang 110004 Liaoning Peoples R China Shenyang Univ technol Sch Mat Shenyang 110870 Liaoning Peoples R China Laiwu iron & steel Grp co ltd Technol Res & Dev Ctr Laiwu 271104 Shandong Peoples R China

Ultra-high strength pipeline steels were rolled by thermal mechanical controlling process (TMCP),and effects of the volume fraction,the size and microstructure morphologies of three different bainite (AF,GB and LB) on mechanical properties were investigated by optical microscope.The results showed that,X120 ultra-high strength pipeline steel was rolled through the reasonable thermal mechanical controlling process (TMCP),and the yield strength and the low temperature charpy impact energy (-30℃) were higher than 840MPa and above 230J,respectively,meanwhile,the ratios of tensile strength to yield strength were lower below 0.82.As for X100 pipeline,of which the mechanical property were higher than that by X100 pipeline steel of ISO standard,yield strength of the steel was 715 MPa,ultimate tensile strength 963 MPa,impact energy 282J,and yield ratio 0.74.

关键词： ultra-high strength pipeline steel bainite TMCP mechanical properties

Sandwich-structured nanocomposites of N-doped graphene and nearly monodisperse Fe304 nanoparticles as high-performance Li-ion battery anodes

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Nano Research 2017年第9期10卷 2923-2933页

作者： Wen Qi Xuan Li Hui Li Weikang Wu Pei Li Ying Wu Chunjiang Kuang Shaoxiong Zhou Xiaolin Li Beijing Key Laboratory of Energy Nanomaterials Advance Technology & Materials Co. Ltd. China Iron & Steel Research Institute Group Beijing 10008 I China School of Materials Science and Engineering Tianjin University Tianjin 300072 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China Department of Stationary Energy Storage Pacific Northwest National Laboratory Richland Washington 99354 USA

iron oxides have attracted considerable interest as abundant materials for high-capacity Li-ion battery anodes. However, their fast capacity fading owing to poorly controlled reversibility of the conversion reactions greatly hinders their application. Here, a sandwich-structured nanocomposite of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles were developed as high-performance Li-ion battery anode. N-doped graphene serves as a conducting framework for the self-assembled structure and controls Fe3O4 nucleation through the interaction of N dopants, surfactant molecules, and iron precursors. Fe3O4 nanoparticles were well dispersed with a uniform diameter of ~15 nm. The unique sandwich structure enables good electron conductivity and Li-ion accessibility and accommodates a large volume change. Hence, it delivers good cycling reversibility and rate performance with a capacity of ~1,227 mA·h·g–1 and 96.8% capacity retention over 1,000 cycles at a current density of 3 A·g–1. Our work provides an ideal structure design for conversion anodes or other electrode materials requiring a large volume change.

关键词： N-doped graphene iron oxides self-assembly Li-ion battery density functional theory

Investigation on the Mechanical Properties at Room Temperature of Q and P steel Sheet With Ultrahigh Strength

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Journal of iron and steel Research(International) 2011年第S1期18卷 851-854页

作者： LIN Jian-ping 1,MIN Jun-ying 1,YE You 2,XIN Li-jiu 1,DING Lei 1 (1.college of Mechanical Engineering,Tongji University,Shanghai 201804,China 2.Pan Asia technical Automotive Center co ltd.,Shanghai 201201,China) Tongji Univ Coll Mech Engn Shanghai 201804 Peoples R China Pan Asia tech Automot ctr co ltd Shanghai 201201 Peoples R China

Quenching and Partitioning (Q&P) steel is a new type ultrahigh strength steel with transformation induced plasticity (TRIP) effect. Uniaxial tensile experiments of the Q&P steel at room temperature were carried out to investigate the effects of sampling angle and strain rate on its mechanical properties. Experimental results show that the flow stress-strain curve, the hardening component n, the anisotropy coefficient through thickness r and the elongation of the Q&P steel are not sensitive to the sampling angle. However, the hardening component n and the elongation of the Q&P steel decrease with increasing the strain rate. Due to the Q&P steel with TRIP effect, when the strain rate greater, the deformation work will transform to the internal energy of specimen, and the TRIP effect of the Q&P steel will be inhibited, which results in less transformed retained austenite. X ray diffraction experiments were performed to verify it.

关键词： Q and P steel mechanical property strain rate TRIP

Microbial communities present on mooring chain steels with different copper contents and corrosion rates

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Journal of Oceanology and Limnology 2020年第2期38卷 378-394页

作者： WU Jiajia GAO Jieyan ZHANG Dun TAN Faqi YIN Jiang WANG Yu SUN Yan LI Ee Key Laboratory of Marine Environmental corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China Open Studio for Marine corrosion and Protection Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Shanghai Bainite Chain Material tech co.ltd. Shanghai 200439China

copper has long been utilized as a disinfectant for bacteria,but its impact on microbial communities attached to the steel surface in seawater remains unknown.In the present study,3 mooring chain steels of different copper contents are subjected to a 3-month marine field exposure,and the corrosion rate increases in the order of BR5 steel(without copper)steel(0.8%copper)steel(0.4%copper).The microbial community results show that copper introduction does not result in an obvious change in microbial quantity,but it alters the diversity,richness,and structure of microbial communities due to the variation in copper-resistance of different species.BR5 CuH steel holds microbial communities with the highest percentage of some well-known corrosive microbes including sulfate-reducing bacteria,sulfuroxidizing bacteria,and iron-oxidizing bacteria,but possesses the lowest community diversity/richness owing to the toxicity of copper.The microbial community diversity/richness is stimulated by the low-copper content of BR5 CuL steel,and this steel also carries an intermediate proportion of such corrosive bacteria.Both well-known corrosive bacteria and microbial community diversity/richness seem to be involved in the corrosion acceleration of copper-bearing mooring chain steels.

关键词： marine corrosion microbially influenced corrosion microbial community mooring chain steel copper introduction