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Tensile behavior of ultrafine-grained low carbon medium manganese steel by intercritical annealing treatment

Journal of Iron and Steel Research International 2020年第12期27卷 1433-1445页

作者： Sohail Ahmad Zheng han Li-ming Fu Huan-rong Wang wei Wang Ai-dang Shan School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai 200240China Baosteel Research Institute Shanghai 201900China

The intercritical annealing treatment at 650 and 700 ℃ results in two ultrafine-grained (UFG) dual-phase ferrite-austenitesteels. The two steels exhibit different and special discontinuous yielding and pronounced Lüders-like strain phenomenawith large yielding strain which are related to their retained γ-austenite (RA) volume fractions and RA stabilities. The steelannealed at 650 ℃ shows an absent or very small strain hardening, while the steel annealed at 700 ℃ shows an obviousstrain hardening upward curvature with increasing strain. The results show that before and during straining, the steel annealedat 650 ℃ exhibits a mixture of equiaxed and elongated UFG α-ferrite and austenite phases;however, the steel annealed at700 ℃ exhibits only elongated UFG α and γ phases. It was found that most of the γ-austenite to α′-martensite transformationoccurred at the initial deformation stage and very small or almost no transformation occurred afterward. This demonstratesthat the strain-induced martensite (SIM) transformation (γ-α′) or transformation-induced plasticity (TRIP) effect dominatesonly at the initial deformation stage. RA remained stable, and no TRIP effect was observed at the final deformation stage. Theload-unload-reload test was performed to evaluate the back stress (σb) hardening effect. It is believed that the pronouncedstrain hardening behavior at the later deformation stage is mainly associated with σb enhancement induced by the strainpartitioning between the soft and hard phases due to SIM transformation during tensile deformation.

关键词： Ultrafine-grained dual-phase ferrite-austenite medium-Mn steel Annealing Deformation behavior Transformation-induced plasticity effect Back stress hardening

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Metadynamic Recrystallization Behavior of As-cast 904L Superaustenitic Stainless Steel

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Journal of Iron and Steel Research International 2016年第2期23卷 151-159页

作者： wei ZhanG Jing ZhanG Ying han rong LIU De-ning ZOU Guan-jun QIAO State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University State Key Laboratory of Solidification Processing Northwestern Polytechnical University Key Laboratory of Advanced Structural Materials of Ministry of Education Changchun University of Technology School of Metallurgy and Engineering Xi'an University of Architecture and Technology

The metadynamic recrystallization （MDRX） behavior of as-cast 904L superaustenitic stainless steel was in- vestigated by double pass isothermal compression tests at temperatures of 950-1 150 ℃, strain rates of 0.05-5 s 1 and interval of 1-100 s. The effects of working parameters （deformation temperature, strain rate, pre-strain and in- terval time） on the flow curves and microstructural evolution were discussed. The MDRX fraction increased obvious- ly with the increase of deformation temperature, strain rate and interval time. The MDRX softening was controlled by the migration of grain boundary, annihilation of dislocation and dynamic recrystallization. Moreover, the kinetic model was established for the prediction of MDRX behavior of as-cast 904L superaustenitic stainless steel based on the experimental data. A good agreement between the predicted and the experimental values was achieved （correla- tion coefficient R2= 0.98）, indicating a satisfactory accuracy.

关键词： superaustenitic stainless steel hot deformation metadynamic recrystallization

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Electrocatalysts with atomic-level site for nitrate reduction to ammonia

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Journal of Energy Chemistry 2024年第9期96卷 642-668页

作者： Shuai Yin rong Cao Yifan han Jiachangli Shang Jing Zhang wei Jiang Guigao Liu National Special Superfine Powder Engineering Research Center School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094JiangsuChina School of Pharmacy Jiangsu UniversityZhenjiang 212013JiangsuChina

Ammonia(NH_(3))is an important raw material for modern agriculture and industry,being widely demanded to sustain the sustainable development of modern ***,the industrial production methods of NH_(3),such as the traditional Haber-Bosch process,have drawbacks including high energy consumption and significant carbon dioxide *** recent years,the electrocatalytic nitrate reduction reaction(NO_(3)RR)powered by intermittent renewable energy sources has gradually become a multidisciplinary research hotspot,as it allows for the efficient synthesis of NH_(3)under mild *** this review,we focus on the research of electrocatalysts with atomic-level site,which have attracted attention due to their extremely high atomic utilization efficiency and unique structural characteristics in the field of NO_(3)***,we introduce the mechanism of nitrate reduction for ammonia synthesis and discuss the in-situ characterization techniques related to the mechanism ***,we review the progress of the electrocatalysts with atomic-level site for nitrate reduction and explore the structure-activity relationship to guide the rational design of efficient ***,the conclusions of this review and the challenges and prospective of this promising field are presented.

关键词： Ammonia synthesis Nitrate reduction Electrocatalysts with atomic-level site Reaction mechanism In-situ characterization techniques

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Management of chronic hepatitis B in pregnancy

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World Journal of Gastroenterology 2012年第33期18卷 4517-4521页

作者： Guo-rong han Chuan-Lu Xu wei Zhao Yong-Feng Yang Department of Gynecology and Obstetrics The Second Affiliated Hospital of the Southeast UniversityNanjing 210003Jiangsu ProvinceChina Department of Infectious Diseases The Second Affiliated Hospital of the Southeast UniversityNanjing 210003Jiangsu ProvinceChina

Pregnancy associated with chronic hepatitis B (CHB) is a common and important problem with unique challenges. Pregnant women infected with CHB are different from the general population, and their special problems need to be considered: such as the effect of hepatitis B virus (HBV) infection on the mother and fetus, the effect of pregnancy on replication of the HBV, whether mothers should take HBV antiviral therapy during pregnancy, the effect of these treatments on the mother and fetus, how to carry out immunization of neonates, whether it can induce hepatitis activity after delivery and other serious issues. At present, there are about 350 million individuals with HBV infection worldwide, of which 50% were infected during the perinatal or neonatal period, especially in HBV-endemic countries. Currently, the rate of HBV infection in thechild-bearing age group is still at a high level, and the infection rate is as high as 8.16%. Effective prevention of mother-to-child transmission is an important means of reducing the global burden of chronic HBV infection. Even after adopting the combined immunization measures, there are still 5%-10% of babies born with HBV infection in hepatitis B e antigen positive pregnant women. As HBV perinatal transmission is the main cause of chronic HBV infection, we must consider how to prevent this transmission to reduce the burden of HBV infection. In this population of chronic HBV infected women of childbearing age, specific detection, intervention and follow-up measures are particularly worthy of attention and discussion.

关键词： Chronic hepatitis B Hepatitis B virus Mother-to-child transmission Perinatal transmission Pregnancy Vertical transmission Antiviral therapy

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牛奶质量安全主要风险因子分析 Ⅶ.体细胞数和菌落总数

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中国畜牧兽医 2012年第7期39卷 1-5页

作者：赵连生王加启郑楠韩荣伟许晓敏屈雪寅甄云鹏农业部奶及奶制品质量监督检验测试中心(北京) 北京100193 中国农业科学院北京畜牧兽医研究所反刍动物营养研究室北京100193

体细胞数和菌落总数是衡量奶牛乳房健康状况和乳品质量的一项重要指标。作者对主要国家牛乳中体细胞数和菌落总数的限量进行了比较,分析了中国与主要国家限量的异同及原因,介绍了体细胞数和菌落总数的检测方法,对体细胞数的变化规律、... 详细信息

体细胞数和菌落总数是衡量奶牛乳房健康状况和乳品质量的一项重要指标。作者对主要国家牛乳中体细胞数和菌落总数的限量进行了比较,分析了中国与主要国家限量的异同及原因,介绍了体细胞数和菌落总数的检测方法,对体细胞数的变化规律、风险评估进行综合分析阐述。

关键词：牛奶风险因子体细胞数菌落总数

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解读“预巴杀”

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中国乳业 2017年第1期 66-68页

作者：韩荣伟张书义于忠娜顾佳升青岛农业大学全国畜牧总站上海奶业行业协会专家委员会

国内许多乳品从业者对"预巴杀"的概念及其在生产中的应用含混不清。通过查阅国际专业乳品机构相关资料,对"Thermization"的定义、生产中应用方式进行了解析,并对其中文译名改为"热抑菌"的建议进行了阐释,以期对国内乳品加工企业的不规... 详细信息

国内许多乳品从业者对"预巴杀"的概念及其在生产中的应用含混不清。通过查阅国际专业乳品机构相关资料,对"Thermization"的定义、生产中应用方式进行了解析,并对其中文译名改为"热抑菌"的建议进行了阐释,以期对国内乳品加工企业的不规范操作进行纠正和规范。

关键词：预巴杀 thermization 热抑菌

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Anti-Recombinant Gametocyte 56 Protein IgY Protected Chickens from Homologous Coccidian Infection

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Journal of Integrative Agriculture 2012年第10期11卷 1721-1728页

作者： DING Jun LIU Qiao-rong han Jin-peng QIAN wei-feng LIU Qun Key Laboratory of Animal Epidemiology and Zoonosis Ministry of Agriculture/College of Veterinary Medicine China Agricultural University

Coccidiosis is caused by intra-cellular infection of Eimeria spp., which goes through a complex life cycle in the intestinal mucosa of infected hosts. Specific immunoglobulins （IgY） could be produced in egg yolk by immunizing hens with specific antigens. In the present study, we cloned the E. maxima gain56 gene, expressed the GST-GAM56 fusion protein and raised IgY to GST-GAM56 in hens. The anti-GST-GAM56 IgY antibody was isolated and used to treat chickens infected with E. maxima oocysts. Intramuscular injection of the antibodies provided minimal protection against parasite infection. However, oral dosing of the IgY 3 or 5 d after oocyst inoculation significantly improved body weight gain, reduced oocyst output and intestinal lesion score were reduced at 3 or 5 d after oocyst challenging, compared to the untreated control group. Our findings suggest that the IgY to gam56 could be an effective prophylactic or therapeutic agent against E. maxima infection in chickens and should have a practical application value.

关键词： Eimeria maxima recombinant GST-GAM56 IgY therapeutic agent

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牛奶中汞的风险分析

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中国畜牧兽医 2012年第8期39卷 1-3页

作者：郑楠王加启许晓敏屈雪寅韩荣伟黄良策叶巧燕中国农业科学院北京畜牧兽医研究所农业部奶及奶制品质量监督检验测试中心(北京)农业部奶产品质量安全风险评估实验室(北京)北京100193

随着工业的发展,空气、水和土壤中汞的含量大幅增加,加大了食品中汞污染的隐患。奶牛摄入、饮用高汞含量的饲料和水都会代谢到乳中。因此,消费者对牛奶中汞的危害要给予高度关注。作者就牛奶中汞的存在形式、来源、危害、监管等方面进... 详细信息

随着工业的发展,空气、水和土壤中汞的含量大幅增加,加大了食品中汞污染的隐患。奶牛摄入、饮用高汞含量的饲料和水都会代谢到乳中。因此,消费者对牛奶中汞的危害要给予高度关注。作者就牛奶中汞的存在形式、来源、危害、监管等方面进行阐述,以期增加消费者对牛奶中汞的科学认识。

关键词：牛奶汞存在形式来源危害监管

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碱性离子液体官能化SiO_2的制备及其催化性能

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天然气化工—C1化学与化工 2009年第4期34卷 27-30页

作者：张雪红张云霄李平韩卫荣崔文广杨晓辉王力武戈石家庄学院化工学院河北石家庄050035 河北师范大学化学与材料科学学院河北石家庄050016

应用超声波技术在温和条件下制得了碱性离子液体官能化SiO2材料。对所制备的样品应用Hammett指示剂法、29SiNMR和低温N2吸脱附实验进行了表征,结果表明离子液体基团已经以共价键嫁接到了SiO2上;不同结构的嫁接型离子液体的碱强度不同;... 详细信息

应用超声波技术在温和条件下制得了碱性离子液体官能化SiO2材料。对所制备的样品应用Hammett指示剂法、29SiNMR和低温N2吸脱附实验进行了表征,结果表明离子液体基团已经以共价键嫁接到了SiO2上;不同结构的嫁接型离子液体的碱强度不同;离子液体嫁接前后对载体的结构影响不大。在甲醇和环氧丙烷合成丙二醇醚的反应中对样品的催化性能做了测试,结果表明,样品在此反应中反应物转化率均大于91%,样品表现出很好的重复使用性能。

关键词：碱性离子液体嫁接SiO2 超声波技术甲醇环氧丙烷丙二醇醚

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Antibacterial properties and corrosion resistance of AISI 420 stainless steels implanted by silver and copper ions

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 322-327页

作者： Hong-wei Ni han-shuang Zhang rong-sheng Chen wei-ting Zhan Kai-fu Huo Zhen-yu Zuo Key Laboratory for Ferrous Metallurgy and Resources Utilization of the Ministry of Education School of Materials and Metallurgy Wuhan University of Science andTechnology Wuhan 430081 China

Silver or copper ions are often chosen as antibacterial agents. But a few reports are concerned with these two antibacterial agents for preparation of antibacterial stainless steel （SS）. The antibacterial properties and corrosion resistance of AISI 420 stainless steel implanted by silver and copper ions were investigated. Due to the cooperative antibacterial effect of silver and copper ions, the Ag/Cu implanted SS showed excellent antibacterial activities against both Gram-negative Escherichia coli （E. coli） and Gram-positive Staphylococcus aureus （S. aureus） at a total implantation dose of 2~ 1017 ions/cm2. Electrochemical polarization curves revealed that the corrosion resistance of Ag/Cu implanted SS was slightly enhanced as compared with that of un-implanted SS, The implanted layer was characterized by X-ray photoelec- tron spectroscopy （XPS）. Core level XPS spectra indicate that the implanted silver and copper ions exist in metallic state in the implanted layer.

关键词： ion implantation antibacterial properties stainless steel Escherichia coli Staphylococcus aureus corrosion resistance

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