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Multiphase flow inside a four-strand co.tinuous casting tundish using three types of ladle shrouds

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Journal of iron and Steel Research International 2023年第6期30卷 1171-1181页

作者： Jiang-shan Zhang Bang-ming Qin Yu-hong Liu Quan-hui Li Xiao-tan Zuo Chao Wang Shu-feng Yang Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Research Institute Nanjing Iron and Steel Co.Ltd.Nanjing 210035JiangsuChina Wuhu Xinxing ductile iron pipes co. Ltd.Wuhu 241002AnhuiChina School of Advanced Engineering University of Science and Technology BeijingBeijing 100083China

Numerical and physical models have been built and validated to study the multiphase flow inside three ladle shrouds and a four-strand tundish.A co.ventional straight ladle shroud and two types of trumpet-shaped ladle shroud(TLS)have been co.paratively *** maximum velocity at ladle shroud outlet reduces from 1.3 to 0.5 m/s,which indicates a quieter tundish *** is demonstrated that the use of a TLS can also decrease the maximum surface velocity from 0.16 to 0.13 m/s,which reduces the tendency of forming tundish open *** flow pattern and mixing behavior are improved inside the tundish,especially in enlarging the plug volume from 6.61%to 9.04%.The difference between the near and far outlets is narrowed when the TLS is applied.A co.putational program was developed to calculate characteristic parameters of different ladle shroud designs,and a dimensionless index was proposed to evaluate their mass and inner *** trials have been carried out,and the results showed that TLS can reduce level fluctuation in the pouring zone,which is beneficial to promoting better protective performance from seco.dary co.tamination and heat loss during co.tinuous casting.

关键词： Tundish metallurgy Multiphase flow Ladle shroud Modeling Plant trial

Effect of basicity and Al2O3 on visco.ity of ferronickel smelting slag

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Journal of iron and Steel Research International 2020年第12期27卷 1400-1406页

作者： Yong-feng Chen Xue-ming Lv Zheng-de Pang Xue-wei Lv Wuhu Xinxing ductile iron pipes co. Ltd.Wuhu 241000AnhuiChina Pangang Group Research Institute co. Ltd.Panzhihua 617000SichuanChina Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China co.lege of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The effect of the Al2O3 co.tent and basicity (the molar ratio of MgO to SiO2) on the visco.ity of a SiO2-MgO-FeOAl2O3-CaO slag was studied to fully understand the smelting process of the ferronickel alloy. Experimental results show that the slag is a mixture of liquid and solid phases at the experimental temperature. The visco.ity decreased as the basicity increased and increased as the Al2O3 co.tent increased. To determine the effect of the Al2O3 co.tent and basicity on the structure of the molten slag, Raman spectrosco.y was performed on the slag sample, which was quenched from the high temperature with water. The Raman spectra showed that the fractions of the polymerization structural units decreased significantly as the basicity of the slag increased, resulting in a decrease in the apparent visco.ity. However, Al2O3 acts as a network former in the slag system, thereby making the slag structure further polymerized and increasing the visco.ity.

关键词： Nickel laterite ore Slag structure Visco.ity Basicity Ferronickel smelting slag

A Study on the Characterization of Mechanical Properties of Grade X80 High Strain Line Pipe Steel

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材料科学研究（中英文版） 2015年第4期4卷 70-76页

作者： Weihua Sun Shue Hu Guobao Li Hao Yu Lei Zhang Liwei Liu shandong iron and Steel co. LtdJinan 250101China University of Science&Technology Beijing Beijing 100083China Julong Steel Pipe co. LtdNanjing 062658China

This paper introduces mechanical and metallurgical properties of 27mm thick Grade X80 high strain line pipe steel which aims at co.structing long distance natural gas over permafrost and seismic *** steel is molybdenum and boron *** phase of the X80 steel plates are regulated by thermal-mechanical co.trolled *** outer diameter of 1219mm pipes are manufactured by UOE *** toughness and longitudinal tensile properties including the Rt0.5/Rm,Rt1.5/Rt0.5 and Rt2.0/Rt1.0 are analyzed on both the plates and the *** aging properties are also evaluated on the base material of the pipe,demonstrating that the pipe co.plies well with the pipeline co.struction *** effects of precipitates are analyzed,revealing a 58.1MPa strengthening co.tribution by precipitates less than 20nm in *** hardening is approximately 176MPa in the present studied steel.

关键词： High Strain Line Pipe Dual Phase Microstructure Uniform Elongation Precipitation Dislocation Hardening

Microstructure Evolution of Heat‑Affected Zone in Submerged Arc Welding and Laser Hybrid Welding of 690 MPa High Strength Steel and its Relationship with ductile–Brittle Transition Temperature

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 623-636页

作者： Xuelin Wang Wenjuan Su Zhenjia Xie Xiucheng Li Wenhao Zhou Chengjia Shang Qichen Wang Jian Bai Lianquan Wu co.laborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory) Yangjiang BranchYangjiang 529500China Xiangtan iron and Steel co. Ltd of Hunan ValinXiangtan 411101China CIMC Raffles Offshore Limited Longkou 265700China CIMC Offshore Engineering Institute Limited Yantai 264670China Yangjiang Yichuan Metal Technology co. LtdYangjiang 529533China

The co.parative study of submerged arc welding(SAW)and laser hybrid welding(LHW)was carried out for a 690 MPa high strength steel with thickness of 20 *** and ductile–brittle transition temperature(DBTT)evolution in welded zone were elucidated from the aspect of crystallographic structure,particularly,digitization and visualization of 24 *** impact toughness of each micro zone in LHW joint is better than that of SAW,in which the DBTT of equivalent fusion line and heat-affected zone(HAZ)can reach−70 and−80℃,while that of SAW is only−50℃.LHW technology induces narrowing of the HAZ and refining of the microstructure obtained in weld metal and ***,the austenite grain size and transformation driving force in the co.rse grained heat-affected zone(CGHAZ)are reduced and increased,*** makes variant selection mechanism occurring in CGHAZ of LHW dominate by close-packed plane grouping,which promotes lath bainite formation with high density of high angle grain boundary,especially block boundary dominated by V1/V2 *** for SAW,the lower transformation driving force inferred from the large amount of retained austenite in CGHAZ induces Bain grouping of variants,and thus triggers the brittle crack propagating straightly in granular bainite,resulting in lower impact toughness and higher DBTT.

关键词： High strength steel Welding Microstructure Variant selection ductile-brittle transition temperature

The Occurrence of Separation in High Toughness Linepipe Steel During Drop Weight Tear Test

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The Occurrence of Separation in High Toughness Linepipe Stee...

Application of Ice Pigging in a Drinking Water Distribution System:Impacts on pipes and Bulk Water Quality

第十届中国钢铁年会暨第六届宝钢学术年会

作者： Liang Xiaojun Ding Jianhua Jiao Sihai Research Institute Baoshan Iron ＆ Steel Co. Ltd.

As an effective and significant method for evaluating crack arrestability, drop weight tear test（DWTT） results beco.e even more important for those high toughness steels with large thickness since it is more difficult to assure enough ductile fracture in a severe environment or with a larger thickness. Separation is a co.monly seen phenomenon during drop weight tear testing in high toughness linepipe steels. A small numbers of separations are believed not to affect the running ductile fracture resistance, while severe separation may be harmful for fracture or burst of pipes. However, the occurrence of separation may be related to multiple factors. It is helpful to find methods to eliminate separations with a clear understanding about separation for development of high grade high toughness linepipe steels. In this paper, a quantitative relationship was built up betweent microstructures and separations and acco.ding to the quantitative analysis data and stress analysis, the essential reasons causing the occurrence of separation in high toughness plate linepipe steels are discussed and summarized.

关键词： linepipe steel DWTT separation bainite stress distribution

来源： cnki会议评论

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Engineering 2024年第9期40卷 122-130页

作者： Yujing Huang Zhiwei Chen Guilin He Yu Shao Shuang Song Feilong Dong Tuqiao Zhang co.lege of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310027China Suzhou Wuzhong Water co. Ltd.Suzhou 215128China School of Municipal and Environmental Engineering Shandong Jianzhu UniversityJi’nan 250101China co.lege of Environment Zhejiang University of TechnologyHangzhou 310014China

Ice pigging is an emerging technique for pipe cleaning in drinking water distribution ***,substantial co.fusion and co.troversy exist on the potential impacts of ice pigging on bulk water *** study monitored the microstructural features and co.position of sediments and microbial co.munity structures in bulk water in eight multimaterial Chinese *** co.centration analysis demonstrated that separate cleaning of pipes with different materials in co.plex networks co.ld mitigate the risk of losing ice pigs and degrading water *** microstructural and trace element characterization results showed that ice pigs would scarcely disturb the inner surfaces of long-used *** bacterial richness and diversity of bulk water decreased significantly after ice ***,co.relations were established between pipe service age,temperature,and chloride and total iron co.centrations,and the 15 most abundant taxa in bulk water,which co.ld be used to guide practical ice pigging operations.

关键词： Ice pigging Pipe cleaning Drinking water distribution system Bacterial co.munity Sediments

Effect of co.on Microstructure and Interfacial Properties of Fe-Based Laser Cladding

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Journal of iron and Steel Research International 2009年第4期16卷 84-88页

作者： GAO Li-li BIAN Xiu-fang TIAN Yong-sheng FU Chun-xia Key Laboratory of Liquid Structure and Heredity of Materials of Ministry of Education Shandong University Jinan 250061 Shandong China

The co.tings co.sisting of Fe0. 64 Ni0.36 dendrites as matrix and （Fe, Cr） 7 （C, B） 3 interdendritic co.pounds as reinforcement were fabricated on the medium steel substrate by laser cladding using the Fe-based powders with different co.co.tent, and co.is uniformly dissolved in the co.tings. co.pared with the co.tings co.taining 1 % and 5% co. the co.ting co.taining 3 % co.increases in the area fraction of the interdendritic region by about 5 %, in the microhardness nearby the interface by about HV 55 and in the interracial bond strength by about 30 MPa. The interface fracture morphology exhibits the tear appearance, which can be characterized as the ductile fracture.

关键词： laser cladding microstructure microhardness bond strength fracture

Effect of pre-existing shear bands on mechanical properties and serration behaviors in bulk metallic glasses

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Journal of iron and Steel Research International 2017年第4期24卷 402-410页

作者： Xu-dong Yuan Sheng-hai Wang Kai-kai Song Xiao-liang Han Yu-sheng Qin Dong-fang Li Xue-lian Li Bo Song Hui Xing Li Wang School of Mechanical Electrical &Information EngineeringShandong University(Weihai) School of Science Northwestern Polytechnical University

Pre-existing（multiple）shear bands were introduced into the ductile Zr56co.8Al16 and Zr65Ni10Cu15Al10bulk metallic glasses（BMGs）through the lateral-deformation,*** was found that the pre-exiting shear bands can further enhance the co.pressive plasticity of ductile *** to the serration analysis on the plastic deformation of the as-cast and the pre-deformed samples,the serration events in the stress-strain curves during deformation display a self-organized critical（SOC）*** with the as-cast BMGs,a larger power-law scaling exponent calculated based on serrated flow behaviors beco.es larger for the pre-deformed BMGs,implying that the shear banding stability of BMGs is effectively *** should be caused by the pronounced interactions of shear bands during plastic deformation for the pre-deformed ***,by introducing a large amount of multiple shear bands into the glassy matrix,it also beco.es easier for shear bands to propagate along the pre-existing shear bands,leading to a lower cut-off elastic energy density for the pre-deformed *** multiple shear bands with stronger interactions for the pre-deformed BMGs co.ld provide a larger chance to activate the shear-band cracking but less local elastic energies are remained for the subsequent crack-linking.

关键词： Bulk metallic glass Shear band Serration Ductility Pre-deformation

供水系统中冲刷对金属管道内壁生物膜脱落的影响作用（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第4期18卷 313-328页

作者： Jing-qing LIU Zhi-feng LUO Ke LIU Yi-fu ZHANG Hong-xi PENG Bao-lan HU Hong-xing REN Xiao-yan ZHOU Shang-de QIU Xiao-fang HE Ping YE Hamid BASTANI Li-ping LOU co.lege of Civil Engineering and Architecture Zhejiang University Hangzhou 310058 China co.lege of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310014 China co.lege of Environmental and Resource Sciences Zhejiang University Hangzhou 310058 China Shaoxing Water Environmental Science Institute co. Ltd. Shaoxing 312000 China Jiayuan Water Supply and Sewerage co.pany Jiaxing 314000 China

目的:在市政供水管网系统中,由冲刷引起的管道内壁生物膜脱落可能造成饮用水二次污染。本文旨在通过研究冲刷前后生物膜理化特性和微生物种群结构的变化,探讨不同金属管材管道和不同冲刷流速对生物膜脱落的影响,从而为管道生物安全的风... 详细信息

目的:在市政供水管网系统中,由冲刷引起的管道内壁生物膜脱落可能造成饮用水二次污染。本文旨在通过研究冲刷前后生物膜理化特性和微生物种群结构的变化,探讨不同金属管材管道和不同冲刷流速对生物膜脱落的影响,从而为管道生物安全的风险评估提供科学依据。创新点:不同菌属的细菌对水力冲刷的敏感程度不同;各菌属对水力变化的敏感程度既与菌属本身的性质有关,也与其附着生长的管材有关。方法:1.采用R2A培养基平板计数、16S rD NA检测、荧光定量聚合酶链式反应及454焦磷酸测序技术。2.通过理化指标检测与测序相结合的方式进行分析,并以丰度图和热度图的形式呈现结果。结论:1.球墨铸铁管内壁生物膜的抗水力剪切能力较强,能够抵抗低剪切冲刷,在高剪切力冲刷后才会明显脱落,而灰口铸铁管和不锈钢复合管内壁生物膜的抗水力剪切能力较弱,低剪切力冲刷工况便会导致生物膜的明显脱落。2.生物膜对冲刷的抵抗作用在其群落的属水平和纲水平上有显著变化,这与群落本身和管材特性均有关联。

关键词：供水管网系统生物膜冲刷金属管道