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High-Temperature Plasticity Enhanced by Multiple Secondary Phases in a High-Si Austenitic Stainless Steel

Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1519-1530页

作者： Sihan Chen Tian Liang Guangcai Ma Chengwu Zheng Deli Chen Yingche Ma Kui Liu CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Shi-Changxu Innovation center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China fushun sub center of technical center Fushun Special Steel Group Co.Ltd.Fushun113001China

An austenitic stainless steel with 6 wt% Si and multiple secondary phases was produced with the aim to achieve enhanced plasticity during hot *** micro structure of the steel after fracture was characterized via electron back-scattered diffraction,transmission Kikuchi diffraction and scanning transmission electron *** the tail of the gage to the necking region,the microstructure of the material evolved from low-angle grain boundaries(LAGB s) to mixtures of LAGBs and high-angle grain boundaries(HAGBs),and fine equiaxed recrystallized *** elongation to failure in the tensile test exceeds 167%.During the hot deformation,continuous dynamic recrystallization of the austenitic matrix was promoted by the multiple secondary *** dislocations introduced by the secondary phases were rearranged and continuously transformed into *** initially coarse grains(30.5 μm) were refined into ultra-fine equiaxed grains(1 μm),which contributed significantly the enhanced plasticity during hot deformation of the *** the necking area of the sample,twins were nucleated in the stress concentration regions and accommodated the local strain by discontinuous dynamic recrystallization,which was also beneficial to improving the plasticity.

关键词： High-Si austenitic stainless steel High-temperature deformation Plasticity enhancement Dynamic recrystallization Secondary phases

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Species-specific COI primers for rapid identification of a globally significant invasive pest, the cassava mealybug Phenacoccus manihoti Matile-Ferrero

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Journal of Integrative Agriculture 2019年第5期18卷 1042-1049页

作者： WANG Yu-sheng TIAN Hu WAN Fang-hao ZHANG Gui-fen State Key Laboratory for Biology of Plant Diseases and Insect Pests/Key Laboratory of Integrated Pest Management of Crop Ministry of Agriculture/Institute of Plant Protection Chinese Academy of Agricultural Sciences Caofeidian sub-center of Hebei Entry-Exit Inspection and Quarantine technical center

The globally invasive cassava mealybug Phenacoccus manihoti Matile-Ferrero is a pernicious pest of cassava,and its recent introduction into Asia has raised considerable *** slow or prevent further invasion,an accurate,simple,and developmental-stage-independent detection method for *** is *** the present study,a PCR method based on a species-specific mitochondrial DNA cytochrome oxidase I(SS-COI)marker was developed for rapid identification of *** pair of SS-COI primers(PMSSZW-1F and PMSSZW-1R)was designed based on sequence variations in the COI gene among *** and related mealybug *** of the primer pair was validated on 21 closely related *** tests were performed on four immature developmental stages and female *** tests demonstrated that at the relatively low concentration of(135.2±14.7)pgresuspended DNA,the specific fragment was detected in all ***,the SS-COI primer pair was assayed on three populations of *** from major exporting countries of *** PCR assay was proved to be a rapid,simple,and reliable molecular measure for the identification of *** tool will be useful for quarantine,monitoring,and management of this invasive pest.

关键词： Phenacoccus manihoti cassava mealybug invasive pest molecular identification species-specific COI primers

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Effect of Aging on Microstructure and Mechanical Property of 1900 MPa Grade Maraging Stainless Steel

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Journal of Materials Science & Technology 2007年第3期23卷 312-318页

作者： Kai LIU Yiyin SHAN Zhiyong YANG Jianxiong LIANG Lun LU Ke YANG Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100039 China General Research Institute for Iron and Steel Beijing 100081 China technical center Dongbei Special Steel Group Co. Fushun 113001 China

The 18%Ni alloy steels provide high strength and toughness, while age-hardenable or PH stainless steels also have good corrosion resistance. This paper focuses on an investigation of the heat treatment, mechanical properties and microstructural development of a new maraging stainless steel. It is reported that the heat treatment process should consist of solution treatment and cryogenic cooling to attain a fully martensitic structure, followed by aging at 813 K. This heat treatment resulted in an ultimate tensile strength of over 1900 MPa combined with good impact toughness. Transmission electron microscopy is used to show that, for the peak-aged condition （813 K/4 h）, nano-sized precipitates, e.g. Ni3Mo and/or R-phase, and a high density of dislocations were uniformly dispersed in the lath martensite matrix. The calculated yield strength, based on a revised Orowan mechanism, is in good agreement with the test data. The steel studied has an ultimate tensile strength over 1900 MPa, excellent fracture toughness, and good resistance against over-aging and relatively good corrosion resistance as well.

关键词： Maraging stainless steels Precipitation High strength steels Aging treatment

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Hot Deformation Behavior of F6NM Stainless Steel

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Journal of Iron and Steel Research International 2014年第11期21卷 1035-1041页

作者： Long-teng MA Li-min WANG Zheng-dong LIU Gang YANG Lun LU Meng-du PENG Institute for Special Steels Central Iron and Steel Research Institute technical center of fushun Special Steel Co. Ltd.Dongbei Special Steel Group Co.Ltd. Faculty of Materials Science and Engineering Kunming University of Science and Technology

The hot deformation behavior of F6NM stainless steel was investigated by hot compression test in a Gleeble-1500D thermal-mechanical simulator. The flow strain-stress curves were obtained and the corresponding metallographic observation of this steel under different deformation conditions was also carried out. This steel exhibi- ted dynamic recrystallization （DRX） in the temperature range of 1 273- 1473 K and the strain rate range of 0.01- 0.1 s^-1. The activation energy for hot deformation was determined to be 457.91 kJ/mol, and the hot deformation equations were also established. The flow instability zone was determined and could be divided into two regions. The first one was located in the temperature range of 1 173- 1 348 K and the strain rate range of 0. 056-10 s^-1 , while the second one is in the temperature range of 1398-1448 K and the strain rate range of 1.25-10 s^-1. In the end, the optimum conditions for hot working were provided.

关键词： F6NM steel dynamic recrystallization flow instability processing map

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Effect of Heat Treatment on Prior Grain Size and Mechanical Property of a Maraging Stainless Steel

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Journal of Materials Science & Technology 2006年第6期22卷 769-774页

Effect of the heat treatment, including solution treatment （ST） and aging treatment （AT）, on the prior austenite grain （PAG） size, microstructure and mechanical properties of a precipitation hardening maraging stainless steel was investigated. The results indicate that the relations between PAG size and yield strength （σy） under both ST and AT conditions obey the HalI-Petch relationship. Furthermore, after ST at 1050℃ for 1 h＋cryogenic treated （CT） at -70℃ for 8 h＋AT at 535℃ for 4 h, the tested steel showed its ultimate tensile strength （σb） and σy over 1900 MPa and 1750 MPa, respectively.

关键词： Martensite Microstructure Precipitation hardening Heat treatment

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Inocula selection in microbial fuel cells based on anodic biofilm abundance of Geobacter sulfurreducens

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Chinese Journal of Chemical Engineering 2016年第3期24卷 379-387页

作者： Guotao Sun Diogo de Sacadura Rodrigues Anders Thygesen Geoffrey Daniel Dinesh Fernando Anne S.Meyer center for BioProcess Engineering Department of Chemical and Biochemical EngineeringTechnical University of Denmark Department of Forest Products Swedish University of Agricultural Sciences

Microbial fuel cells （MFCs） rely on microbial conversion of organic substrates to electricity. The optimal perfor- mance depends on the establishment of a microbial community rich in electrogenic bacteria. Usually this micro- bial community is established from inoculation of the MFC anode chamber with naturally occurring mixed inocula. In this study, the electrochemical performance of MFCs and microbial community evolution were eval- uated for three inocula including domestic wastewater （DW）, lake sediment （LS） and biogas sludge （BS） with varying substrate loading （Lsub） and external resistance （Rext） on the MFC. The electrogenic bacterium Geobacter sulfurreducens was identified in all inocula and its abundance during MFC operation was positively linked to the MFC performance. The IS inoculated MFCs showed highest abundance （18% ± 1%） of G. sulfurreducens, maximum current density [Imax = （690 ± 30） mA.m 2] and coulombic efficiency （CE = 29% ±1%） with acetate as the substrate./max and CE increased to （1780 ± 30） mA.m-2 and 58%± 1%, respectively, after decreasing the Rext from 1000 Ωto 200 Ω, which also correlated to a higher abundance ofG. sulfurreducens （21% ±0.7%） on the MFC anodic biofilm. The data obtained contribute to understanding the microbial community response to Lsub and Roy, for of timizing electricity eneration in MFCs.

关键词： Lake sediment Coulombic efficiency Denaturing gradient gel electrophoresis Geobacter sulfurreducens Anode polarisation resistance

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Synthesis and characterization of BaTiO_3/α-Fe_2O_3 core/shell structure

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Journal of Advanced Ceramics 2019年第1期8卷 133-147页

作者： Suzana FILIPOVI? Vera P.PAVLOVI? Miodrag MITRI? Steva LEVI? Neboj?a MITROVI? Aleksa MARI?I? Branislav VLAHOVI? Vladimir B.PAVLOVI? Institute of technical Sciences of Serbian Academy of Sciences and Arts Faculty of Mechanical Engineering University of Belgrade "Vin?a" Institute of Nuclear Sciences University of Belgrade Faculty of Agriculture University of Belgrade Faculty of technical Sciences ?a?ak University of Kragujevac North Carolina Central University NASA University Research center for Aerospace Device Research and Education and NSF center of Research Excellence in Science and Technology Computational center for Fundamental and Applied Science and Education

Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO_3/α-Fe_2 O_3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method(co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained.

关键词： ceramics electronic materials magnetic materials Raman spectroscopy X-ray diffraction(XRD) ferroelectricity

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The oscillations in ESR spectra of Hg_(0.76)Cd_(0.24)Te implanted by Ag^+ at the X and Q-bands

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Journal of Semiconductors 2018年第5期39卷 1-5页

作者： A.V.Shestakov I.I.Fazlizhanov I.V.Yatsyk I.F.Gilmutdinov M.I.Ibragimova V.A.Shustov R.M.Eremina Zavoisky Physical-technical Institute Federal Research Center "Kazan Scientific Center of RAS" Physics Institute Kazan (Volga Region) Federal University

The objects of the investigation were uniformly Ag~＋ doped Hg_（0.76）Cd_（0.24） Te mercury chalcogenide monocrystals obtained by ion implantation with subsequent thermal annealing over 20 days. After implantation and annealing the conductivity was inverted from n-type with carrier concentration of 10^（16） cm^（-3） to p-type with carrier concentration of ≈ 3.9 × 10^（15） cm^（-3）. The investigations of microwave absorption derivative（d P/d H） showed the existence of strong oscillations in the magnetic field for Ag：Hg_（0.76）Cd_（0.24） Te in the temperature range 4.2–12 K. The concentration and effective mass of charge carrier were determined from oscillation period and temperature dependency of oscillation amplitude. We suppose that this phenomenon is similar to the de Haas–van Alphen effect in weakly correlated electron system with imperfect nesting vector.

关键词： de Haas–van Alphen effect AgHg0.76Cd0.24Te magnetic resonance

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ASFV pp62 Protein Has 9 Dominant B-T Cell Combined Epitopes

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Animal Husbandry and Feed Science 2022年第4期14卷 13-20页

作者： Cao Qianda Dai Bihong Yang Yang Cao Xuelian fushun Animal Disease Control center Zigong 643200China Neijiang Vocational&technical College Neijiang 641000China Yanjiang Animal Disease Control center Ziyang 641300China

[Objective]The paper was to study the basic characteristics of the pp62 protein of the African swine fever virus strain Pig/HLJ/2018,and to provide more basic data for the study of the virus.[Method]We used the ProtParam program to analyze the physical and chemical properties of the pp62 ***-2.0 and SignalP-5.0 were used to analyze protein transmembrane region and signal peptide,and Lasergene 7.0 Protean program was used to study protein antigen index,hydrophilicity,surface accessibility and titration *** N-glycosylation site and O-glycosylation site came out with NetNGlyc-1.0 and NetOGlyc-4.0 online ***,PSIPRED-4.0,NetSurfP-2.0,and PSRSM were used to analyze protein secondary structure,BepiPred1.0 and IEDB tools were used to analyze protein B-cell epitopes,and NetMHC 4.0 and NetMHCpan tools were used to analyze protein T-cell *** we used Swiss-Model to analyze the high-level structure of the protein,the EzMol tool to visually analyze B-T cell combined epitopes,and finally,MEGA 7.0 to analyze the genetic evolutionary relationship of the protein.[Result]The pp62 protein of African swine fever viral strain Pig/HLJ/2018 had a molecular weight of 60.5 *** was a hydrophilic acid labile protein,and had no transmembrane region and signal *** were 5 N-glycosylation sites and 4 O-glycosylation *** of the secondary structure of the protein showed that the proportions of helix,coil and strands were 45.5%,41.7%and 12.8%,*** study of dominant epitopes revealed that there were 14 dominant B-cell epitopes and 16 dominant T-cell *** 9 dominant B-T cell combined epitopes located on the surface of the protein molecule were *** phylogenetic tree constructed with the pp62 protein showed that the evolutionary relationship of Pig/HLJ/2018 strain was the closest to Georgia/2007/1,which belonged to genotype II.[Conclusion]The results will provide basic information for pp62 research.

关键词： African swine fever virus pp62 CP530R Dominant B-T cell combined epitope Phylogenetic tree Visual analysis

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Synthesis of ferromagnetic La1-xSrxMnO3 nanoparticles by precipitation from diethylene glycol solution and their properties

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Journal of Advanced Ceramics 2016年第3期5卷 197-203页

作者： Yulia SHLAPA Sergii SOLOPAN Oleksandr YELENICH Volodymyr TRACHEVSKII Anatolii BELOUS V.I.Vernadsky Institute of General and Inorganic Chemistry NAS of Ukraine32/34 Palladina Avenue 03680 Kyiv 142 Ukraine technical center NAS of Ukraine

La1−x Sr x MnO3 nanoparticles were synthesized by precipitation from diethylene glycol solution. Features of synthesis were studied using 1Н, 13С, 139La... 详细信息

La1−x Sr x MnO3 nanoparticles were synthesized by precipitation from diethylene glycol solution. Features of synthesis were studied using 1Н, 13С, 139La nuclear magnetic resonance (NMR) investigations. The obtained results showed that the complexation reaction between diethylene glycol and metal cations takes place during the synthesis. These complexes decomposed at 200 °C and an amorphous precursor (La,Sr)MnO3 was formed. According to X-ray results, the crystallization of the perovskite structure began at 600 °C and finished at 800 °C. Microstructural studies showed that obtained nanoparticles are weakly agglomerated and have small sizes. Based on these nanoparticles, magnetic fluid was prepared which was effectively heated under an alternating magnetic field.

关键词： manganite perovskite precipitation complexation reaction diethylene glycol nuclear magnetic resonance (NMR)

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