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莱钢3200m^3高炉检修快速恢复操作实践

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莱钢科技 2011年第6期 8-9,11页

作者：邱国兴姜智文董征科型钢炼铁厂

莱钢3#3 200m3高炉进行了近16h的休风检修工作，复风后采取了退负荷、快速加风及优化炉前出铁等措施，复风4h后炉况恢复到正常生产水平，取得良好效果。

关键词：大型高炉检修复风

Effect of an external magnetic field on improved electroslag remelting cladding process

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1511-1521页

作者： zhiwen Hou Yanwu dong Zhouhua Jiang Zhihao Hu Limeng Liu Kunjie Tian School of Metallurgy Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Obtaining a uniform interface temperature field plays a crucial role in the interface bonding quality of bimetal compound ***,this study proposes an improved electroslag remelting cladding(ESRC)process using an external magnetic field to improve the uniformity of the interface temperature of compound *** improved ESRC comprises a conventional ESRC circuit and an external coil circuit.A comprehensive 3D model,including multi-physics fields,is proposed to study the effect of external magnetic fields on the multi-phys-ics fields and interface temperature *** simulated results demonstrate that the nonuniform Joule heat and flow fields cause a non-uniform interface temperature in the conventional *** for the improved ESRC,the magnetic flux density(B_(coil))along the z-axis is pro-duced by an anticlockwise current of the external *** rotating Lorentz force is generated from the interaction between the radial current and axial B_(coil).Therefore,the slag pool flows clockwise,which enhances circumferential effective thermal *** a result,the uniformity of the temperature field and interface temperature *** addition,the magnetic flux density and rotational speed of the simulated results are in good agreement with those of the experimental results,which verifies the accuracy of the improved ESRC ***,an improved ESRC is efficient for industrial production of the compound roll with a uniform interface bonding quality.

关键词： improved ESRC external magnetic field multi-physics fields rotating Lorentz force interface temperature uniformity

Chiral nanoporous networks featuring various chiral vertices from an achiral molecule on Ag(100)

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Nano Research 2022年第4期15卷 3753-3762页

作者： dong Han Tao Wang Jianmin Huang Xingyu Li zhiwen Zeng Junfa Zhu National Synchrotron Radiation Laboratory Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei 230029China

Chiral nanoporous nanoarchitectures exhibit potential applications in various fields including chiral separation,sensing and ***-dimensional(2D)supramolecular chemistry offers novel methods to build chiral nanoporous networks from achiral ***,we report a series of chiral nanoporous networks built by an achiral precursor molecule via a stepwise annealing strategy on Ag(100).The nanoporous network morphologies and structural details are characterized by high-resolution scanning tunneling microscopy(STM).It is revealed that all vertices within networks are *** chiral vertices are either dimeric,trimeric,or *** connection of these chiral vertices gives rise to diverse chiral nanopores with varying shapes and sizes.A strict chirality correlation between nanopores and their vertices is ***,enantiomeric vertices of one-pair nanopore enantiomers are always in identical type but opposite *** work serves as a model to investigate the influence of vertex chirality on nanopore chirality of a supramolecular *** attained chiral nanopores could potentially be utilized as templates for surface reaction,chiral recognition,*** mirror-symmetric silver adatoms clusters dictated by chiral nanopore are discerned.

关键词： two-dimensional chirality chiral nanoporous networks chiral vertices scanning tunneling microscopy

Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 324-334页

作者： Yushuo Li Yanwu dong Zhouhua Jiang Qingfei Tang Shuyang Du zhiwen Hou School of Metallurgy Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

The hot deformation behavior of Mn18Cr18N and Mn18Cr18N+Ce high nitrogen austenitic stainless steels at 1173-1473 K and 0.01-1 s^(-1) were investigated by thermal compression *** influence mechanism of Ce on the hot deformation behavior was analyzed by Ce-containing inclusions and segregation of *** results show that after the addition of Ce,large,angular,hard,and brittle inclusions(TiN-Al_(2)O_(3),TiN,and Al_(2)O_(3)) can be modified to fine and dispersed Ce-containing inclusions(Ce-Al-O-S and TiN-Ce-Al-O-S).During the solidification,Ce-containing inclusions can be used as heterogeneous nucleation particles to refine as-cast *** the hot deformation,Ce-containing inclusions can pin dislocation movement and grain boundary migration,induce dynamic recrystallization(DRX)nucleation,and avoid the formation and propagation of micro cracks and *** addition,during the solidification,Ce atoms enrich at the front of solid-li-quid interface,resulting in composition supercooling and refining the secondary ***,during the hot deformation,Ce atoms tend to segregate at the boundaries of DRX grains,inhibiting the growth of *** the synergistic effect of Ce-containing inclusions and Ce segregation,although the hot deformation resistance and hot deformation activation energy are improved,DRX is more likely to occur and the size of DRX grains is significantly refined,and the problem of hot deformation cracking can be ***,the microhardness of the samples was *** results show that compared with as-cast samples,the microhardness of hot-deformed samples increases signific-antly,and with the increase of DRX degree,the microhardness decreases *** addition,Ce can affect the microhardness of Mn18Cr18N steel by affecting as-cast and hot deformation microstructures.

关键词： rare earth hot deformation Mn18Cr18N steel non-metallic inclusions element segregation microhardness

三维可视化技术在石油矿产勘查钻探工程中的应用

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粘接 2021年第4期46卷 170-173页

作者：祝元营董志文马韧王绍岩宫殿东北石油大学地球科学学院大庆163318 中国石油东方地球物理公司保定072750

文章将主要研究在石油矿产勘查钻探工程中应用三维可视化技术。三维可视化技术的功能强大,具有直观、快速、美观的特点,应用于钻探工程将会具有较好的优势。文章首先对三维可视化技术在钻探工程中需求进行分析,然后对三维复杂物体多边... 详细信息

文章将主要研究在石油矿产勘查钻探工程中应用三维可视化技术。三维可视化技术的功能强大,具有直观、快速、美观的特点,应用于钻探工程将会具有较好的优势。文章首先对三维可视化技术在钻探工程中需求进行分析,然后对三维复杂物体多边形构造方式进行分析,再分析了三维地层的构造和显示,最后通过应用实例,表明了三维可视化技术在钻探工程中具有非常重要和多样的作用。

关键词：三维可视化技术石油勘察钻探工程应用

基于数字图像相关技术的混杂纤维混凝土动态抗拉性能试验研究

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材料导报 2023年第21期37卷 293-301页

作者：杨国梁毕京九董智文刘依韩子默李旭光中国矿业大学(北京)力学与建筑工程学院北京100083 中航天建设工程集团有限公司北京100070

为研究不同纤维混杂比例下的钢-聚丙烯纤维混凝土(SPFRC)的动态抗拉性能,对六组不同纤维混杂比例的混凝土试件进行动态巴西劈裂试验,借助高速摄像仪和数字图像相关技术(DIC)对各组试样动态拉伸断裂过程进行记录和分析。研究表明:试件的... 详细信息

为研究不同纤维混杂比例下的钢-聚丙烯纤维混凝土(SPFRC)的动态抗拉性能,对六组不同纤维混杂比例的混凝土试件进行动态巴西劈裂试验,借助高速摄像仪和数字图像相关技术(DIC)对各组试样动态拉伸断裂过程进行记录和分析。研究表明:试件的应力时程曲线可以划分为缓速增长、快速增长、稳定、衰减和二次增长五个阶段,相较于素水泥砂浆试件,纤维混凝土试件在应力率二次增长后出现显著的稳定波动平台,纤维混凝土试件的动态拉伸破坏过程具有显著的延性特征;在总纤维掺量保持2%不变的条件下,混杂1%钢纤维与1%聚丙烯纤维的试件具有较优的动态抗拉强度和耗能能力;添加纤维可以减弱试件中心处的拉应变集中现象,混杂1.5%聚丙烯纤维和0.5%钢纤维的试件具有较优的开裂控制能力,平均开裂应变较素水泥砂浆试件提高了2.94倍。

关键词：分离式霍普金森杆数字图像相关技术动态巴西劈裂试验混杂纤维混凝土

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珠海洪湾地区淤泥物理与宏观力学特性研究

中山大学学报（自然科学版）（中英文） 2024年第3期63卷 32-37页

作者：李栋汪旭闫一辉刘建坤唐昌意李智文李智健常丹珠海市规划设计研究院广东珠海519001 中山大学土木工程学院广东珠海519082

珠海洪湾地区淤泥分布广泛,且具有强度低、变形大、透水性差等特点,其物理力学性质对于工程的安全性至关重要。为探明其工程特性,本研究以现场所取原状淤泥试样为研究对象,通过开展室内基本物性试验、一维固结试验和固结不排水三轴试验... 详细信息

珠海洪湾地区淤泥分布广泛,且具有强度低、变形大、透水性差等特点,其物理力学性质对于工程的安全性至关重要。为探明其工程特性,本研究以现场所取原状淤泥试样为研究对象,通过开展室内基本物性试验、一维固结试验和固结不排水三轴试验,得到了原状试样的工程特性。试验结果表明:现场原状土样天然含水量高,塑性指数较大,渗透系数k为3.68×10^(-7)~5.86×10^(-7)cm/s;压缩系数a_(v)=1.269~1.618 MPa^(-1)、压缩模量E_(s)=1.449~1.919 MPa,判定其为高压缩性土;随着土样深度的增加,其压缩系数逐渐减小,压缩模量逐渐增大;该原状土样的抗剪强度较小,黏聚力c=10.10~20.84 kPa,内摩擦角φ=7.28°~12.09°;随着土样深度的增加,其内摩擦角有较小的增长趋势,而黏聚力整体表现为逐渐降低的趋势。

关键词：珠海淤泥基本物理特性一维压缩特性三轴力学特性

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低聚壳聚糖锆配合物的制备及其性能

广东化工 2015年第11期42卷 48-49页

作者：郝辰艳董志文陈菲张晓娟尹爱萍忻州师范学院化学系山西忻州034000

以低聚壳聚糖(L-CTS)和硝酸锆为原料合成了低聚壳聚糖锆配合物[L-CTS-Zr(Ⅳ)]。利用红外光谱、紫外光谱、核磁、X-粉末衍射对配合物进行了表征。探讨了配合物的抑菌性,结果表明:低聚壳聚糖锆配合物的抑菌性强于低聚壳聚糖。

关键词：低聚壳聚糖锆配合物红外光谱紫外光谱抑菌性

Effect of functional groups on tribological properties of lubricants and mechanism investigation

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Friction 2023年第6期11卷 911-926页

作者： Hongxiang YU Haijie CHEN zhiwen ZHENG Dan QIAO Dapeng FENG Zhenbin GONG Guojun dong State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Nine organic compounds were utilized as model lubricants to investigate the impact of functional groups on tribological *** Acid with carboxyl showed the best lubrication properties,and fluid film and tribofilm were coexistent in its friction test,bringing a low friction coefficient and wear *** addition,the lubricant with low friction coefficient corresponded to high adsorption energy in density functional theory(DFT)*** the lubricant forming adsorption film with large surface energy displayed small wear rate in friction ***,adsorption energies positively correlated surface *** on the experimental results,the action mechanism of functional groups on tribological properties of lubricants was *** functional groups make lubricant molecules show different adsorption energies and surface *** molecules with high adsorption energy are more likely to adsorb on substrates and form a vertical monolayer,which can maintain a regular molecular brush structure during friction and bring a low friction *** lubricant molecules with high surface energy may be more prone having tribochemical reactions during friction and forming protective tribofilm,which leads to a low wear rate.

关键词： functional group tribological property adsorption energy surface energy action mechanism