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Improving flangeability of multiphase steel by increasing microstructural homogeneity

Journal of Iron and Steel Research International 2024年第7期31卷 1736-1745页

作者： Xiao-yu yang yong-gang yang Xing Fang Han-long Zhang Zhen-li Mi Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Baosteel Group Corp.Technology Center Shanghai 201900China

Multiphase microstructure significantly increases the strength,usually at the expense of flangeability because of lacking microstructure *** further improve the strength-flangeability of multiphase steel,the microstructural homogeneity was advanced by adjusting the hard martensite/austenite(M/A)*** strength-flangeability was measured via uniaxial tensile tests and hole expansion *** microstructures were characterized using a scanning electron microscope equipped with an electron backscatter diffraction detector and a transmission electron *** tests were supplementally used to quantitatively reveal the microstructural homogeneity of the *** show that the adjusted multiphase steel achieves an excellent ultimate tensile strength(~800 MPa)and flangeability(~135%hole expansion ratio).A promising homogeneous multiphase microstructure was obtained by controlling undercooled austenite transformed at about 600℃.This microstructure consists of soft polygonal ferrite,blocky bainitic ferrite,and hard M/A *** volume fraction of M/A islands is around 5%,and the average size is less than l *** nanoindentation analysis indicated that the participation of M/A islands impressively influenced the microstructural *** strain partition and better mechanical compatibility were present in the adjusted multiphase steel since the plasticity initiation started late,which resulted in a positive ***,avoiding M/A islands distributed in the chain along the rolling direction on the matrix hindered the possibility of voids coalescing into cracks and stabilized the flanging performance.

关键词： Multiphase steel Flangeability Martensite/austenite island-Microstructural homogeneity-Microstructure Compact strip production process

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TDDFT Study on Excited-State Hydrogen Bonding of 2'-Deoxyguanosine in H2O Solution

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Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： Dong-lin Li Hui Li yong-gang yang Yu-fang Liu Department of Physics Henan Normal University Xinxiang 453007 China

The mono and dihydrated complexes of 2′-deoxyguanosine have been used to elucidate the importance of the 2′-hydroxy group in the hydration. Density functional theory and time-dependent density functional theory methods were performed to investigate the ground-and excited-statehydrogen bonding properties of 2′-deoxyguanosine-water (2′-dG-W) and 2′-deoxyguanosine-2water (2′-dG-2W). Infrared spectra, geometric optimizations, frontier molecular orbitals and Mulliken charges have also been studied. The results demonstrated that the excited-state intramolecular hydrogen bonding dynamics of complexes 2′-dG-W and 2′-dG-2W behaves differently upon photoexcitation, while their intermolecular hydrogen bonding dynamics behaves similarly. Moreover, the significant weakening of the intermolecular hydrogen bond O4?H1–N1 and the formation of the new strong hydrogen bond O4?H3–N2 in the 2′-dG-2W upon photoexcitation were due to the geometric structure bending of guanine and the rigidity of related molecules. In addition, the charge transfer properties were theoretically investigated by analysis of molecular orbital.

关键词： Hydrate Time-dependent density functional theory Rigidity Hydrogen bonding dynamics

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Effects of strain states on stability of retained austenite in medium Mn steels

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Journal of Iron and Steel Research International 2017年第11期24卷 1125-1130页

作者： Mei Xu yong-gang yang Jia-yong Chen Di Tang Hai-tao Jiang Zhen-li Mi Institute of Engineering Technology University of Science and Technology BeijingBeijing 100083China BYD Auto Industry Company Limited Shenzhen 518116GuangdongChina Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

Based on uniaxial tensile and plane strain deformation tests, the effects of strain states on the stability of RA （retained austenite） in medium Mn steels, which were subjected to IA （intercritical annealing） and Q＆P （quenching and partitioning） processing, were investigated. The volume fractions of RA before and after deformation were measured at different equivalent strains. The transformation behaviors of RA were also investigated. The stability of RA differed across two different transformation stages at the plane strain state： the stability was much lower in the first stage than in the second stage. For the uniaxial ten sion strain state, the stability of RA corresponded only to a single transformation stage. The main reason was that there were two types of transformations from RA in the medium Mn steel for the plane strain state. One type was that the martensite originated in the strain-induced stacking faults （SISF）. The other type was the strain-induced directly twin martensite at a certain equivalent strain. However, for the uniax- ial tension state, only the strain-induced twin martensite was observed. Dislocation lines and dislocation tangles were also observed in specimens deformed at different strain states. In addition, complex micro- structures of stacking faults and lath-like phases were observed within a grain at the plane strain state.

关键词： Medium Mn steel Strain state Retained austenite Stability Stacking fault Twin martensite

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Effects of nano-ceramic additives on high-temperature mechanical properties and corrosion behavior of 310S austenitic stainless steel

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Journal of Iron and Steel Research International 2023年第3期30卷 591-600页

作者： Rong Zhu Mai Wang Zhen-li Mi Qi Zhang Xiao-yu yang yong-gang yang Yan-xin Wu Institute of Engineering Technology University of Science and Technology BeijingBeijing 102206China

A novel approach to reduce Ni content for the 310S austenitic stainless steel was *** nano-ceramic additive(L)was applied to 310S steel to replace part of Ni element and reduce the *** means of thermal simulation,X-ray diffraction,field emission scanning electron microscopy,and electron backscattered diffraction,the effects of nanoceramic additives on high-temperature mechanical properties and corrosion behavior of the 310S steel were *** results indicate that the morphology and density of the(Fe,Cr)_(23)C_(6)carbides are varied,which play an important role in the high-temperature mechanical properties and corrosion *** adding nano-ceramic additives,the high-temperature tensile strength and yield strength are improved simultaneously,in spite of a slight decrease in the total *** high-temperature corrosion process,the mass gain of all the samples is parabolic with *** mass gain is increased in the 310S steel with nano-ceramic additive,while the substrate thickness is significantly larger than 310S *** more stable and adherent FeCr_(2)O_(4)spinel form is the reason why the high-temperature corrosion resistance was ***(Fe,Cr)_(23)C_(6)carbides distribution along grain boundaries is detrimental to the high-temperature corrosion resistance.

关键词： Austenitic stainless steel Nano-ceramic additive High-temperature mechanical property High-temperature corrosion behavior FeCr_(2)O_(4)spinel

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Modeling analysis of cobalt-based Fischer-Tropsch catalyst particles

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Chinese Journal of Chemical Engineering 2024年第6期70卷 82-92页

作者： Huashuai Wu gang Wang yong yang yongwang Li College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China National Energy Research&Development Center for Coal to Liquid Fuels Synfuels China CompanyLimitedBeijing 101400China

The influences of particle size,shape,and catalyst distribution on the reactivity and hydrocarbon product selectivity of a cobalt-based catalyst for Fischer-Tropsch synthesis were investigated in the present work.A self-consistent kinetic model for Fischer-Tropsch reaction proposed here was found to correlate experimental data well and hence was used to describe the consumption rates of reactants and formation rates of hydrocarbon *** perturbed-chain statistical associating fluid theory equation of state was used to describe vapor-liquid equilibrium behavior associated with Fischer-Tropsch *** interaction between intraparticle diffusion and Fischer-Tropsch reaction was investigated in *** showed that in order to avoid the adverse influence of intraparticle diffusional limitations on catalyst reactivity and product selectivity,the use of small particles is *** eggshell spherical particles are shown to keep the original catalyst reactivity and enhance the selectivity of heavy hydrocarbon *** suitable layer thickness for a spherical particle with a diameter of 2 mm is nearly 0.15 *** the same outer diameter of 2 mm,the catalyst reactivity and heavy product selectivity of hollow cylindrical particles with a layer thickness of 0.25 mm are found to be larger than eggshell spherical *** the viewpoint of catalytic performance,hollow cylindrical particles are a better choice for industrial applications.

关键词： Fischer-Tropsch synthesis Kinetic modeling Vapor-liquid equilibria Numerical simulation Intraparticle diffusion Particle shapes

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Preparation and characterizations of helical mesoporous silica nanorods using CTAB and alcohols

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Chinese Chemical Letters 2012年第10期23卷 1201-1204页

作者： Yun Yue Pu Yi Li Wei Zhuang Ming Zhang Bao Zong Li yong gang yang Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Helical mesoporous silica nanorods were prepared using cetyltrimethylammonium bromide and achiral alcohols as the co-structure-directing agents. They were characterized using field-emission scanning electron microscopy, transmission electron microscopy, nitrogen sorptions, and small angle X-ray diffraction. The length of the silica nanorods increases with increasing the length of the alcohols. When n-heptanol and n-octanol were used, helical mesoporous silica nanorods with lamellar mesopores on the surfaces were obtained.

关键词： Mesoporous Alcohols Surfactant Helical Sol-gel processes

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The Synthesis of Cyclotriphosphazene Liquid Crystals

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Chinese Chemical Letters 1998年第8期9卷 727-729页

作者： yong gang yang Jian Xun WEN(Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032) Chinese Acad Sci Shanghai Inst Organ Chem Shanghai 200032 Peoples R China

Four functional cyclotriphosphazene liquid crystals have been synthesized. Their phase transition temperatures have also been measured by polarizing textural observation and confirming by DSC.

关键词： cyclotriphosphazene liquid crystal synthesis

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Effects of strain rate on austenite stability and mechanical properties in a 5Mn steel

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Journal of Iron and Steel Research International 2022年第2期29卷 316-326页

作者： yong-gang yang Wang-zhong Mu Xiao-qing Li Hai-tao Jiang Mai Wang Zhen-li Mi Xin-ping Mao Beijing Advanced Innovation Center for Materials Genome Engineering National Engineering Research Center for Advanced Rolling TechnologyUniversity of Science and Technology BeijingBeijing100083China Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm10044Sweden Department of Mechanical Engineering The University of Hong KongHong Kong999077China

The austenite stability and the mechanical properties in a typical medium Mn grade steel,i.e.,5Mn steel,were investigated under a wide range of strain rates through the combination of experimental and theoretical *** obtained results indicate that austenite is more stable at a high strain rate,which is due to the suppression of the austenite to martensite *** suppression is attributed to the increased stacking fault energy and the high deformation energy ***,the suppression of martensitic transformation also leads to the decrease in the ultimate tensile strength and the uniform *** to the increase in an adiabatic heating temperature,an increase in the uniform elongation is acquired at a high strain *** obtained fundamental study results shed light on a wide application of the medium Mn steel under different strain rate conditions.

关键词： Medium Mn steel Austenite stability Microstructure Mechanical property Strain rate

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Preparation of optical active single-handed helical barium titanate nanotubes and characterization of dielectric properties

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Chinese Chemical Letters 2017年第5期28卷 1111-1113页

作者： Shu-Wei Lin Wen-Hu Qian Hong-Jing Huo Bao-Zong Li Yi Li yong-gang yang Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and EngineeringState and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Left and right-handed helical barium titanate nanotubes are prepared with the impregnation of Ba（OH）2 into single-handed helical titania *** angle X-ray diffraction pattern and transmission electron microscopy image indicate that they are constructed by nanoparticles with a partially crystalline *** diffuse reflertance circular dichroism spectra indicate that they exhibit optical activity which was proposed to originate from chiral defects on the inner surfaces of the *** the dielectric constant and tanδ decrease with increasing the *** 10 and 100 Hz,one dielectric constant peak at 9.6℃ and one tanδ peak at 5.0℃ are observed at -120℃ to 180℃.

关键词： Dielectrics Barium titanate Optical materials and properties Templating approach Nanoparticles

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Study on synergistic leaching of potassium and phosphorus from potassium feldspar and solid waste phosphogypsum via coupling reactions

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Chinese Journal of Chemical Engineering 2024年第1期65卷 117-129页

作者： Chao Li Shizhao Wang Yunshan Wang Xuebin An gang yang yong Sun School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China National Engineering Research Center of Green Recycling for Strategic Metal Resources Chinese Academy of SciencesBeijing 100190China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupWA 6027Australia Key Laboratory of Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province The University of Nottingham Ningbo ChinaNingbo 315100China

To achieve the resource utilization of solid waste phosphogypsum(PG)and tackle the problem of utilizing potassium feldspar(PF),a coupled synergistic process between PG and PF is proposed in this *** study investigates the features of P and F in PG,and explores the decomposition of PF using hydrofluoric acid(HF)in the sulfuric acid system for K leaching and leaching of P and F in *** impact factors such as sulfuric acid concentration,reaction temperature,reaction time,material ratio(PG/PF),liquid–solid ratio,PF particle size,and PF calcination temperature on the leaching of P and K is systematically investigated in this *** results show that under optimal conditions,the leaching rate of K and P reach more than 93%and 96%,*** study using shrinking core model(SCM)indicates two significant stages with internal diffusion predominantly controlling the leaching of *** apparent activation energies of these two stages are 11.92 kJ·mol^(-1)and 11.55 kJ·mol^(-1),respectively.

关键词： Phosphogypsum Potassium feldspar Coupling reaction Leaching Waste treatment Kinetics

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