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Effect of Thermomechanical Control Processing on Microstructure and Mechanical Properties of Fe-0.2C-1.44Si-1.32Mn Hot Rolled TRIP Steel

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Journal of Iron and Steel Research International 2010年第7期17卷 44-50页

作者： zhang zi-cheng ZHU Fu-xian LI Yan-mei State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The effect of thermomechanical control processing（TMCP）on microstructure and mechanical properties of Fe-0.2C-1.44Si-1.32Mn hot rolled TRIP steel was investigated through ***-induced transformation and transformation-induced plasticity behavior of retained austenite were *** results show that with multipass deformation,reduction per pass of more than critical deformation in austenite recrystallization region and total reduction of more than 58% in non-recrystallization region and high temperature section of two-phase region,austenite can be refined before γ→α *** is beneficial to obtain refined ferrite grain in final *** obtain fine and uniform microstructure and excellent strength-ductility balance,a three-stage cooling process（laminar cooling-air cooling-ultra-fast cooling）after hot rolling was *** ultimate tensile strength and elongation of the investigated steel can reach 663 MPa and 41%,respectively.

关键词： hot rolled TRIP steel TRIP effect retained austenite transformation-induced plasticity mechanical property

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油气行业标准内容技术指标比对方法研究

标准科学 2024年第5期 96-101页

作者：徐婷张自成李茹张华李炎华吕华中国石油集团工程材料研究院有限公司大庆油田有限责任公司测试技术服务分公司

油气行业标准内容技术指标比对对于明确油气行业发展目标和提升油气行业质量效率具有重大理论和现实意义。本文明晰了油气行业标准指标比对的概念内涵,分别从人工比对与机器自动比对等两方面对现有研究进行了总结和归纳。围绕油气行业... 详细信息

油气行业标准内容技术指标比对对于明确油气行业发展目标和提升油气行业质量效率具有重大理论和现实意义。本文明晰了油气行业标准指标比对的概念内涵,分别从人工比对与机器自动比对等两方面对现有研究进行了总结和归纳。围绕油气行业标准技术指标比对的业务流程,提出了油气行业标准指标自动比对的关键技术的解决方案。在此基础上,研判了油气行业标准指标比对技术或方法面临的问题,并提出了针对性的对策建议。

关键词：油气行业标准指标比对人工比对机器辅助比对对策建议

Effect of Cooling Method on Microstructure and Mechanical Properties of Hot-Rolled C-Si-Mn TRIP Steel

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Journal of Iron and Steel Research International 2012年第1期19卷 41-46页

作者： LIU Ji-yuan zhang zi-cheng ZHU Fu-xian LI Yan-mei Manabe Ken-ichi State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004LiaoningChina Department of Mechanical Engineering Tokyo Metropolitan UniversityTokyo 192-0397Japan

The controlled cooling technology following hot rolling process is a vital factor that affects the final micro- structure and mechanical properties of the hot-rolled transformation induced plasticity （TRIP） steels. In the present study, low alloy C-Si-Mn TRIP steel was successfully fabricated by hot rolling process with a 4450 hot roiling mill. To maximize the volume fraction and stability of retained austenite of the steel, two different cooling methods （aircooling and ultra-fast cooling ＂AC-UFC＂ and ultrmfast cooling, air cooling and ultra-fast cooling ＂UFC-AC-UFC＂） were conducted. The effects of the cooling method on the microstructure of hot-rolled TRIP steel were investigated via optical microscope, transmission electron microscope and conversion electron Mossbauer spectroscope. The mechanical properties of the steel were also evaluated by conventional tensile test. The results indicated that ferrite and bainite in the microstructure were refined with the cooling method of UFC-AC-UFC. The morphology of retained austenite was also changed from small islands distributing in bainite district （obtained with AC-UFC） to granular shape locating at the triple junction of the ferrite grain boundaries （obtained with UFC-AC-UFC）. As a result, the TRIP steel with a content of retained austenite of 11. 52%, total elongation of 32% and product of tensile strength and total elongation of 27 552 MPa·% was obtained.

关键词： hot-rolled TRIP steel retained austenite TRIP effect Mossbauer spectra mechanical property

Early prediction and prevention of infected pancreatic necrosis

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World Journal of Gastroenterology 2024年第9期30卷 1005-1010页

作者： cheng Lv zi-Xiong zhang Lu Ke Department of Critical Care Medicine Jinling HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjing 210000Jiangsu ProvinceChina Research Institute of Critical Care Medicine and Emergency Rescue Nanjing UniversityNanjing 210000Jiangsu ProvinceChina

Approximately 20%-30%of patients with acute necrotizing pancreatitis develop infected pancreatic necrosis(IPN),a highly morbid and potentially lethal *** identification of patients at high risk of IPN may facilitate appropriate preventive measures to improve clinical *** the past two decades,several markers and predictive tools have been proposed and evaluated for this *** biomarkers like C-reactive protein,procalcitonin,lymphocyte count,interleukin-6,and interleukin-8,and newly developed biomarkers like angiopoietin-2 all showed significant association with *** the other hand,scoring systems like the Acute Physiology and Chronic Health Evaluation II and Pancreatitis Activity Scoring System have also been tested,and the results showed that they may provide better *** early prevention of IPN,several new therapies were tested,including early enteral nutrition,anti-biotics,probiotics,immune enhancement,etc.,but the results *** together,several evidence-supported predictive markers and scoring systems are readily available for predicting ***,effective treatments to reduce the incidence of IPN are still lacking apart from early enteral *** this editorial,we summarize evidence concerning early prediction and prevention of IPN,providing insights into future practice and study design.A more homo-geneous patient population with reliable risk-stratification tools may help find effective treatments to reduce the risk of IPN,thereby achieving individualized treatment.

关键词： Acute pancreatitis Infected pancreatic necrosis Biomarker Scoring system Nutrition therapy Selective digestive decontamination Probiotics Antibiotics Immune enhancement therapy

Modeling of LF refining process:a review

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Journal of Iron and Steel Research International 2024年第2期31卷 289-317页

作者： zi-cheng Xin Jiang-shan zhang Kai-xiang Peng Jun-guo zhang Chun-hui zhang Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China Tangshan Branch Hebei Iron and Steel Co.Ltd.Tangshan063000HebeiChina Xinjiang Bayi Iron and Steel Co. Ltd.Baosteel GroupWulumuqi830022XinjiangChina

With the increasing demand for energy conservation and emission reduction,more attentions have been paid to the intelligentization,greenization and low carbonization during the transformation and upgrading of steelmaking *** furnace(LF)refining is one of the key procedures in steelmaking process and has been widely used in steelmaking plants for its high equipment matching degree,low equipment investment and outstanding refining *** to the main tasks of LF refining process,the modeling methods of temperature prediction model,slag-making model,alloying model,argon blowing model and model of inclusions behavior were systematically reviewed,and the advantages and disadvantages of each modeling method were *** addition,the technical framework for the future has also been proposed based on existing works,including classification of raw materials,graphic representation of knowledge,introduction,upgradation and management of device/equipment,customization of steelmaking,modeling of refining process,synergy of models,intelligentization of decision-making,automation of control,and digitization of processes and operations,aiming to provide a reference for the modeling and intelligent development of LF refining process.

关键词： LF refining Temperature prediction Slag-making Alloying Argon blowing Inclusion behavior Modeling method

Effect of lanthanum on inclusions in non-oriented electrical steel slabs

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Journal of Iron and Steel Research International 2024年第7期31卷 1680-1691页

作者： Qiang Ren Zhi-yuan Hu Yun-xia Liu Wei-cheng zhang zi-qi Gao Li-feng zhang School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Research and Development Department Shougang Zhixin Qian'an Electromagnetic Material Co.Ltd.Qian'an 064400HebeiChina School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

The effect of lanthanum on the characteristics of inclusions in the slab of non-oriented electrical steels was investigated through industrial trials and thermodynamic *** number,size,and chemical composition of inclusions in the surface,one-quarter of thickness and the center of slabs with and without lanthanum addition were statistically analyzed using an automatic inclusion analysis *** the lanthanum-free slab,inclusions were predominately ***_(2)O_(3),MgO,and AlN as well as a small number of Al_(2)O_(3)-MgO-CaO and *** number densities of oxide inclusions and AlN decreased from the surface to the center of the slab,which was ascribed to the difference in cooling intensity during the continuous *** the steel with lanthanum addition,inclusions were modified into LaAlO_(3) and La_(2)O_(2)S and gradually transformed into dual-phase MgO-La_(2)S3 with an increasing distance from the slab surface due to the reaction between the lanthanum-containing inclusion and the steel *** uneven distribution of oxide inclusions along the thickness of the slab was eliminated in the lanthanum-bearing slab because the dissolved oxygen was remarkably decreased by ***-bearing inclusions were more likely to agglomerate AlN by inducing the heterogeneous nucleation of AlN on their surface,while small-size ***_(2)O_(3) inclusions hardly showed a coarsening effect on the size of AlN.

关键词： Lanthanum-Inclusion Non-oriented electrical steel Aluminum nitride Heterogenous nucleation

聚苯乙烯纳米塑料(PS-NPs)对大豆生理指标及基因表达的影响

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中国油料作物学报 2024年第2期46卷 284-293页

作者：胡艳丽王惠中焦妍李冬梅张子呈姜妍佟晓红王磊王绍东王遂东北农业大学大豆生物学教育部重点实验室黑龙江哈尔滨150030 佳木斯农业农村局黑龙江佳木斯154000 黑龙江省农业科学院作物资源研究所黑龙江哈尔滨150030 东北农业大学国家大豆工程技术研究中心黑龙江哈尔滨150028 东北农业大学资源与环境学院黑龙江哈尔滨150030

纳米塑料是一种新兴污染物,其对农作物的影响越来越受到关注。为探究大豆对聚苯乙烯纳米塑料(polystyrene nanoplastics,PS-NPs)在生理和基因表达水平上的响应,本试验采用水培方式,测定50 mg/L 100 nm的PS-NPs暴露处理10 d后大豆幼苗的... 详细信息

纳米塑料是一种新兴污染物,其对农作物的影响越来越受到关注。为探究大豆对聚苯乙烯纳米塑料(polystyrene nanoplastics,PS-NPs)在生理和基因表达水平上的响应,本试验采用水培方式,测定50 mg/L 100 nm的PS-NPs暴露处理10 d后大豆幼苗的表型及生理指标,并对大豆幼苗根系进行转录组测序分析。结果表明,PS-NPs暴露处理后,大豆幼苗生长受抑制,根系形态发生显著变化,超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性均一定程度增加,丙二醛(MDA)含量显著增加,可溶性糖含量减少。转录组分析表明,PS-NPs暴露处理共产生2112个差异基因,GO和KEGG分析显示其主要富集到与氧化还原反应、对乙烯和脱落酸的响应、氨基酸代谢和其他次生代谢物的合成相关的通路,注释到有250个转录因子发生差异表达,主要为ERF、WRKY、NAC、bHLH和MYB转录因子家族。本试验为进一步深入探究纳米塑料对大豆等农作物产生的影响及其分子机制奠定基础。

关键词：大豆纳米塑料生理指标基因表达

Multi-distortion suppression for neutron radiographic images based on generative adversarial network

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Nuclear Science and Techniques 2024年第4期35卷 176-188页

作者： cheng-Bo Meng Wang-Wei Zhu Zhen zhang zi-Tong Wang Chen-Yi Zhao Shuang Qiao Tian zhang School of Physics Northeast Normal UniversityChangchun 130024China

Neutron radiography is a crucial nondestructive testing technology widely used in the aerospace,military,and nuclear ***,because of the physical limitations of neutron sources and collimators,the resulting neutron radiographic images inevitably exhibit multiple distortions,including noise,geometric unsharpness,and white ***,these distortions are particularly significant in compact neutron radiography systems with low neutron ***,in this study,we devised a multi-distortion suppression network that employs a modified generative adversarial network to improve the quality of degraded neutron radiographic *** neutron radiographic image datasets with various types and levels of distortion were built for the first time as multi-distortion suppression ***,the coordinate attention mechanism was incorporated into the backbone network to augment the capability of the proposed network to learn the abstract relationship between ideally clear and degraded *** experiments were performed;the results show that the proposed method can effectively suppress multiple distortions in real neutron radiographic images and achieve state-of-theart perceptual visual quality,thus demonstrating its application potential in neutron radiography.

关键词： Neutron radiography Multi-distortion suppression Generative adversarial network Coordinate attention mechanism

Simultaneous determination of flavonoids and anthraquinones in chrysanthemum by capillary electrophoresis with amperometry detection

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Chinese Chemical Letters 2010年第10期21卷 1231-1234页

作者： Yin Yan zhang zi cheng Li Jin Kun Zhu Zhi Yong Yang Qing Jiang Wang Pin Gang He Yu Zhi Fang Department of Chemistry East China Normal University Shanghai 200062 China

A high-performance capillary electrophoresis with amperometry detection method （CE-AD） has been developed for the analysis of flavonoids and anthraquinones （emodin, kaempferol, apigenin, luteolin and rhein） in chrysanthemum. Under optimum conditions, these five analytes were base-line separated within 17 min using a borate-phosphate running buffer （1.5 ×10^-2 mol/L borate-3× 10^-2 mol/L phosphate running buffer, pH 9.0） at a working potential of ＋0.90 V （vs. SCE） and a separation voltage of 19 kV. The linear relationship between concentration and current response was obtained with detection limits （S/N = 3） ranging from 1.0 × 10^-7 to 2.1 × 10^-7 g/mL for all analytes. This proposed method was successfully used in the analysis of four kinds of chrysanthemum with relatively simple extraction procedures, the assay results were satisfactory.

关键词： Capillary electrophoresis Amperometry detection Chrysanthemu Flavonoids Anthraquinones