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A method for observing tridimensional morphology of sulfide inclusions by non-aqueous solution electrolytic etching

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Journal of Iron and Steel Research International 2019年第3期26卷 275-284页

作者： Dong Zhang Ping Shen Jian-bo Xie Jin-min An zong-ze Huang Jian-xun Fu State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced Ferrous Metallurgy School of Materials Science and Engineering Shanghai University Shanghai 200072 China State Key Laboratory of Development and Application Technology of Automotive Steel (Baosteel Group) Shanghai 20190 China

Three-dimensional investigation of sulfides is required in order to improve the mechanical properties of steel by controlling the sulfides in the steel.A method including its principles and device is introduced for the investigation of threedimensional morphology of *** method is suitable for gear steel,free cutting steel,non-quenched steel,tempered steel(ws≥0.02 wt.%),*** influences of current density,time,and temperature on the exposure degree of sulfide inclusions were investigated by using 16MnCrS5 *** best parameters of electrolytic etching of sulfur steel,as found by experimentation,are as follows:current density,37.5-52.5 mA/cm2;time,30-35 min;and temperature,—10 to 0℃.Under these conditions,the three-dimensional morphology of sulfide inclusions in sulfur-bearing steel can be exposed effectively.

关键词： Sulfide Non-aqueous electrolyte Electrolytic etching Three-dimensional morphology

Delayed diffuse lamellar keratitis after small-incision lenticule extraction related to immunoglobulin A nephropathy:A case report

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World Journal of Clinical Cases 2022年第13期10卷 4131-4136页

作者： Ting-Ting Dan Tai-Xiang Liu Yi-Lu Liao zong-ze Li Department of Ophthalmology The Affiliated Hospital of Zunyi Medical UniversityZunyi 563003Guizhou ProvinceChina

BACKGROUND Diffuse lamellar keratitis(DLK)is a complication of laser-assisted in situ keratomileusis(LASIK).This condition can also develop after small-incision lenticule extraction(SMILE)with a distinctive *** report the case involving a female patient with delayed onset DLK accompanied by immunoglobulin A(IgA)*** SUMMARY A 22-year-old woman was referred to our department for DLK and a decline in vision 1 mo after undergoing *** initial examination showed grade 2 DLK in the flap involving the central visual axis of the right *** was immediately administered with a large dose of a topical steroid for 30 ***,the treatment was *** vision deteriorated from 10/20 to 6/20,and DLK gradually worsened from grade 2 to ***,interface washout was performed,after which her vision *** completely disappeared 2 mo after *** months after SMILE,the patient was diagnosed with IgA nephropathy due to a 4-year history of interstitial *** DLK is a typical complication of LASIK but can also develop after *** steroid therapy was ineffective in our patient,and interface washout was *** nephropathy could be one of the factors contributing to the development of delayed DLK after SMILE.

关键词： Diffuse lamellar keratitis Small-incision lenticule extraction Immunoglobulin A nephropathy Laser-assisted in situ keratomileusis Case report

Asymmetric multilayered MXene-Ag NWs/cellulose nanofiber composite films with antibacterial properties for high-efficiency electromagnetic interference shielding

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Journal of Materials Science & Technology 2022年第34期129卷 181-189页

作者： Fudong Zhang Penggang Ren Zhengzheng Guo Jin Wang Zhengyan Chen ze zong Jie Hu Yanling Jin Fang Ren The Faculty of Printing Packaging Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an 710048China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China

Flexible, lightweight, robust and versatile properties are essential for the next generation of wearable as well as intelligent electromagnetic interference(EMI) shielding materials. In this work, multilayered films containing cellulose nanofiber(CNF) layers, CNF/MXene layers, and CNF/silver nanowires(CNF/Ag NWs)layers were fabricated by an efficient and easy-to-use vacuum filtration method. Compared with a uniformly mixed film, the resultant layered composite films that loaded with a low MXene and AgNWs content exhibit superior mechanical properties with a tensile strength of 137 MPa, a strain at break of 5.7%, excellent EMI shielding effectiveness(EMI SE) of 61.9 d B, and higher EMI SE/t of 20,653 d B cm^(-1).This is attributed to the high-performance CNF substrate, the highly efficient layered structures, and extensive hydrogen-bonding interactions. In particular, a high degree of ohmic loss of multiple interfaces and polarization relaxation of local defects, as well as an abundance of terminal groups, favor the loss of electromagnetic waves(EMW) within the material. In addition, the prepared multifunctional layered composite films also show good antibacterial properties. As a result, the obtained new kind of flexible layered structure EMI shielding composite films with excellent EMI shielding performance, and mechanical properties present promising application prospects in the fields of EMI shielding and protection for aerospace, portable, and wearable flexible electronic devices.

关键词： MXene AgNWs Laminar structure Electromagnetic interference shielding Flexibility

Effect of cooling rate on microstructure and inclusion in non-quenched and tempered steel during horizontal directional solidification

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Journal of Iron and Steel Research International 2019年第9期26卷 973-982页

作者： Hui Liu zong-ze Huang Da-jiang Yu De-lin Hu Hong-gang Zhong Qi-jie Zhai Jian-xun Fu State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200072China State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group) Shanghai 201900China

In order to investigate the relationship between microstructure and MnS inclusion in non-quenched and tempered steel, and cooling rate during horizontal directional solidification, 49MnVS steel was used to conduct the experiments with a selfdesigned device. The mathematical effect of cooling rate on dendritic arm spacing and mean diameter of MnS particles (dMnS) were determined by using linear regression method. The results show that the length of dendrite from solid–liquid interface to end-solidification decreased with increasing the withdrawal velocity (#). dMnS has a similar value in the area of the steady directional solidification;the value of dMnS was 4.1, 3.6, 3.3, 2.8 and 2.3 lm at withdrawal velocity of 50, 75, 100, 150 and 200 lm/s, respectively. dMnS increased with reducing # or RC (interface cooling rate). MnS precipitated in the gaps between dendrites and was influenced by secondary dendritic arm spacing. Besides, a new concept of the ‘Precipitation Unit Space’(PUS) was proposed and the relationships between dMnS, VPUS (volume of PUS) and RC were obtained.

关键词： Horizontal directional solidification Dendrite MnS Inclusion Cooling rate

High cycle rotating bending fatigue performance and fracture behavior in a pearlite-ferrite dual-phase steel

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Journal of Iron and Steel Research International 2022年第3期29卷 519-528页

作者： Xin-bo Ji Si-xin Zhao Li-ming Fu Jian Peng Jia-qiang Gao Da-jiang Yu zong-ze Huang Ai-dang Shan School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China Baosteel Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai201900China

To clarify the effects of ferrite morphologies and contents on high-cycle fatigue property of pearlite-ferrite dual-phase(DP)steel used for fabrication of commercial vehicle crankshafts,two types of DP steels with different ferrite grain sizes(S10:13.1μm and S30:21.4μm)and ferrite contents(S10:~9.5 vol.%and S30:~30.4 vol.%)were *** amplitude-logarithm of number of high cycles to failure fatigue of the two DP steels was *** results showed a fatigue strength of 510 and 400 MPa for S10 and S30 steels,respectively,at 10^(7) *** cracks in S10 steel extended preferentially along the grain boundary,but it was easy for crack propagation to extend within a pearlite colony to form a zigzag crack *** roughness was enhanced and high stress was introduced to the crack surface due to this kind of crack propagation behavior,which has positive effects on slowing down crack ***,the crack propagation in S30 steel mainly occurred inside the soft equiaxed coarse ferrite *** revealed that little stress was introduced to the crack *** results show that it is possible to improve high cycle fatigue strength of pearlite-ferrite DP steel by appropriately manipulating the volume fraction and microstructure morphology of ferrite phase.

关键词： Pearlite-ferrite steel Ferrite morphology Ferrite content Fatigue perfomance Fracture characteristics

基于机器视觉的玉米定位施肥控制系统设计与试验

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农业机械学报 2021年第S1期52卷 66-73页

作者：宗泽刘刚中国农业大学现代精细农业系统集成研究教育部重点实验室北京100083 中国农业大学农业农村部农业信息获取技术重点实验室北京100083

为了实现农田环境下的苗期玉米定位定量施肥作业,提高肥料利用率,本文设计了基于机器视觉的苗期玉米定位施肥控制系统,控制自驱动履带式田间玉米定位施肥机,使用切片式排肥器结构实现间歇式施肥。采集苗期玉米冠层图像后,利用颜色特征... 详细信息

为了实现农田环境下的苗期玉米定位定量施肥作业,提高肥料利用率,本文设计了基于机器视觉的苗期玉米定位施肥控制系统,控制自驱动履带式田间玉米定位施肥机,使用切片式排肥器结构实现间歇式施肥。采集苗期玉米冠层图像后,利用颜色特征区分连续拍摄过程中的大量背景图像和识别错误的株心,改进了株心识别定位方法;建立施肥滞后误差补偿模型,实时计算施肥相对距离,准确计算排肥器的落肥时刻,实现了按株间歇式自动定位施肥。经过试验与验证分析,改进的株心定位识别方法明显缩减了图像处理时间,提高了算法鲁棒性;3个挡位施肥量(7.25、14.5、21.75 g)的施肥稳定性变异系数分别为1.93%、1.87%、1.93%,施肥量控制精度大于95%,施肥位置准确性平均误差为3.2 cm,可以实现精准定位施肥。本文设计的施肥控制系统可以实现苗期玉米按株定位定量施肥,达到了减施提质、科学施肥的目的。

关键词：施肥控制系统机器视觉苗期玉米按株间歇式施肥株心识别定位

Nitrogen Desorption in Molten Stainless Steel During Immersion Argon Blowing

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Journal of Iron and Steel Research International 2010年第5期17卷 1-5页

作者： CHEN Jian-bin CHEN Qi-zhong HUANG zong-ze HU Ji-ye SUN Ya-qin PAN Jia-qi School of Materials Science and Engineering Shanghai Institute of Technology Shanghai 200235 China Products and Technology Institute Research and Development Center Shanghai Baosteel Group Corporation Shanghai 201900 China

The behavior of nitrogen desorption reaction in molten stainless steel for AISI 304 and 316 during immersion argon blowing through an immersed alumina nozzle with 3 mm in I. D. has been investigated by sampling method. Some kinetic parameters such as reaction order, rate constant and apparent activation energy of nitrogen desorption reaction for AISI 304 and 316 have been obtained. Results show that nitrogen desorption reaction from molten stainless steel for AISI 304 and 316 is the second order reaction. The rate constant at 1550 ℃ and 1 580 ℃ for AISI 316 is 0. 08407%-1 · min^-1 and 0. 82370%-1 · min^-1 , respectively. The rate constant at 1550 ℃ for AISI 304 is 0. 416 6%-1 · min^-1. The apparent activation energy Ea of nitrogen desorption reaction for AISI 316 is 2 136.47 kJ/ mol. This huge value of apparent activation energy verifies that the nitrogen desorption reaction has a complex and multistep reaction mechanism. The rate of nitrogen desorption reaction from molten stainless steel is mixed controlled by the desorption reaction of diatomic molecule nitrogen or of monatomic nitrogen from molten metal at the gas-metal interface and the mass transfer of nitrogen in molten metal. The rate equation of process for nitrogen desorption has been deduced.

关键词： nitrogen desorption stainless steel immersion argon blowing sampling method kinetics

Overview:Development of Clean Steel Production at Baosteel

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Journal of Iron and Steel Research International 2011年第S2期18卷 36-41页

作者： HUANG zong-ze,ZHENG Yi-yu,JIANG Xiao-fang,CUI Jian(Baoshan Iron and Steel Co Ltd.Shanghai 201900,China) Baoshan Iron & Steel Co Ltd Shanghai 201900 Peoples R China

The development of clean steel technology at Baosteel can be dated back to the first production of IF steels and pipeline steels in the early *** the technology has gradually covered nearly the whole range of *** progressive development is introduced in the overview including the levels of cleanliness for some steel grades at *** technologies at different processes for the production of clean steel and the removal of some impurity elements in molten steel are also *** are given on the future research and development of clean steel technology at Baosteel in the aim to keep a sustainable development,which should focus on the basic research,inclusion control and making efficient use of inclusions,as well as stable and reliable low-cost manufacturing technology,removal of harmful residual elements,and the expanding of the technology to stainless steels and special steels.

关键词： clean steel inclusion secondary refining

Bilateral and symmetric C1-C2 dumbbell ganglioneuromas associated with neurofibromatosis type 1: A case report

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World Journal of Clinical Cases 2019年第1期7卷 109-115页

作者： Chun-Yu Tan Jia-Wei Liu Yi Lin Xin-Xin Tie Peng Cheng Xue Qi Yue Gao zong-ze Guo Department of Neurosurgery The First Hospital of China Medical University X-ray Department The First Hospital of China Medical University Department of Pathology The First Hospital of China Medical University

BACKGROUND Ganglioneuroma(GN) is a rare and benign tumor that originates from autonomic nervous system ganglion cells. The most frequently involved sites are the posterior mediastinum, the abdominal cavity, and the retroperitoneal space. It rarely occurs in the cervical area, compressing the spinal cord. Neurofibromatosis type 1(NF-1) is an autosomal dominant inheritance disorder, whose prevalence rate approximates one per *** SUMMARY We report an extremely rare case of bilateral and symmetric dumbbell GNs of the cervical spine with NF-1. A 27-year-old man with NF-1 presented with a one-year history of gradually progressive right upper extremity weakness and numbness in both hands. Magnetic resonance imaging showed bilateral and symmetric dumbbell lesions at the C1-C2 levels compressing the spinal cord. We performed total resection of bilateral tumors, and the postoperative histopathological diagnosis of the resected mass was GN. After operation, the preoperative symptoms were gradually relieved without complications. To our knowledge,this is the sixth report of cervical bilateral dumbbell *** In some cases, cervical bilateral dumbbell GNs could be associated with *** exact diagnosis cannot be obtained before operation, and pathological outcome is the current gold standard. Surgical resection is the most effective option, and disease outcome is generally good after treatment.

关键词： Ganglioneuroma Cervical Bilateral Dumbbell Surgery Case report