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Roles of pre-formed martensite in below-Ms bainite formation,microstructure,strain partitioning and impact absorption energies of low-carbon bainitic steel

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Journal of Materials Science & Technology 2022年第1期96卷 69-84页

作者： Lihe Qian Zhi Li Tongliang Wang Dongdong Li Fucheng Zhang jiangying meng State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China Library of Yanshan University Yanshan UniversityQinhuangdao 066004China

The roles of pre-formed martensite(PM)in below-Ms bainite formation,microstructure,crystallography,strain partitioning and mechanical properties of a low-carbon bainitic steel were investigated using electron-backscattered diffraction,transmission electron microscopy,micro digital image correlation technique and mechanical *** is demonstrated that the pre-formation of martensite eliminates the incubation time for bainite transformation at various austempering temperatures below Ms,indicative of its acceleration effect at the early stage of *** effect is mainly attributed to the surfaces or tips of the PM acting as the nuclei of subsequently-formed bainite,with initial bainite tending to form around the ***,the finishing time for below-Ms bainite transformation,especially at even lower temperatures,is retarded,owing to the dividing effect of PM on parent austenite grains,the decreasing effect of lowered isothermal temperature on the diffusion rate of carbon atoms and the strengthening effect of lowered isothermal temperature on supercooled *** and its adjacent bainitic laths have nearly the same crystallographic orientation and belong to the same *** pre-formation of martensite largely refines the bainitic blocks/laths and retained *** specimens with PM show relatively uniform strain partitioning among various phases,contrasting with the specimens without PM,for which strains are highly concentrated in the bainite region nearby fresh martensite/austenite(M/A)blocks or between adjacent M/A *** impact absorption energies of the specimens with PM,when austempered at 30-60℃ below Ms,are more than twice higher than those of the specimens without PM,at no expense of tensile properties.

关键词： Bainite Martensite Impact toughness Transformation kinetics Strain partitioning

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Roles of Al in enhancing the thermal stability of reverted austenite and mechanical properties of a medium-Mn TRIP steel containing 2.7 Mn

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Journal of Materials Science & Technology 2023年第36期167卷 119-136页

作者： Wenlu Yu Lihe Qian Xu Peng Tongliang Wang Kaifang Li Chaozhang Wei Zhaoxiang Chen Fucheng Zhang jiangying meng State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

Often,the addition of more than 4 wt.%Mn to medium-Mn steels is necessary to enhance the thermal stability of intercritical austenite for achieving sufficient amounts of retained austenite(RA)at room *** this paper,a medium-Mn steel with Mn content as low as 2.7 wt.%was designed via alloying with a small amount of Al,and the microstructure and mechanical properties of the steel,subjected to intercritical annealing(IA)at 745°C for different times followed by oil quenching,were *** show that the volume fraction of RA increases first and then decreases with IA time,with the maximum of 0.36 obtained at IA time of 50 *** is demonstrated that Al addition slows down the in-terface migration and growth kinetics of reverted austenite via retarding C diffusion in ferrite during IA,which,hence,decreases the amount and size of the reverted austenite and partitions more C and Mn into *** suggests that Al plays a favorable role in enhancing the thermal stability of reverted austenite and increasing the amount of austenite retained at room *** to the presence of large amounts of RA and the strong transformation-induced plasticity effect generated during plastic deformation,the steel exhibits persistent high strain hardening and superior mechanical properties,comparable to those of reported medium-Mn steels containing higher Mn *** present result offers a new insight into the role of Al in adjusting microstructure-property relationships and opens a promising way for designing low-cost,high performance medium-Mn steels with low Mn content for industrial applications.

关键词： Medium-Mn steel Transformation-induced plasticity Transformation kinetics Austenite thermal stability Mechanical properties

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Regulation of interlayer channels of graphene oxide nanosheets in ultra-thin Pebax mixed-matrix membranes for CO_(2) capture

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Chinese Journal of Chemical Engineering 2024年第3期67卷 257-267页

作者： Feifan Yang Yuanhang Jin jiangying Liu Haipeng Zhu Rong Xu Fenjuan Xiangli Gongping Liu Wanqin Jin State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Shandong Production and Research Long Membrane Technology Development Co. Ltd.Yantai Economic Development ZoneYantai 265505China

For the application of carbon capture by membrane process,it is crucial to develop a highly permeable CO_(2)-selective *** this work,we reported an ultra-thin polyether-block-amide(Pebax)mixedmatrix membranes(MMMs)incorporated by graphene oxide(GO),in which the interlayer channels were regulated to optimize the CO_(2)/N_(2) separation *** membrane preparation conditions were systematically investigated on the influence of the membrane structure and separation performance,including the lateral size of GO nanosheets,GO loading,thermal reduction temperature,and *** results demonstrated that the precisely regulated interlayer channel of GO nanosheets can rapidly provide CO_(2)-selective transport channels due to the synergetic effects of size sieving and preferential *** GO/Pebax ultra-thin MMMs exhibited CO_(2)/N_(2) selectivity of 72 and CO_(2) permeance of 400 GPU(1 GPU=106 cm^(3)(STP)·cm^(2)·s^(-1)·cmHg^(-1)),providing a promising candidate for CO_(2) capture.

关键词： Mixed-matrix membrane Ultra-thin membrane Pebax Graphene oxide CO_(2) capture

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Gut microbiota remodeling drived by dietary millet protein prevents the metabolic syndrome

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Food Science and Human Wellness 2024年第4期13卷 1987-2001页

作者： Shuhua Shan Ruopeng Yin jiangying Shi Lizhen Zhang Jiaqi Zhou Qinqin Qiao Xiushan Dong Wenjing Zhao Zhuoyu Li Institute of Biotechnology Key Laboratory of Chemical Biology and Molecular Engineering of National Ministry of EducationShanxi UniversityTaiyuan 030006China School of Life Science Shanxi UniversityTaiyuan 030006China Shanxi Bethune Hospital Shanxi Academy of Medical SciencesTongji Shanxi HospitalThird Hospital of Shanxi Medical UniversityTaiyuan 030032China Department of Biology Biological Science and Technology CollegeTaiyuan Normal UniversityJinzhong 030619China

Metabolic syndrome(Met S)is a chronic disease associated with the disturbance of gut microbiota *** derived from gut microbes play essential roles in Met S prevention and ***,we focused on the inhibitory effect of the extract of millet bran protein(EMBP)on a high-fat diet(HFD)-induced Met S,aiming to identify gut microbiota and their metabolites that involve in the anti-Met S activity of *** obesity,chronic inflammation,insulin resistance in Met S mouse models were abolished after EMBP *** protective mechanism of EMBP against HFD-induced Met S may depend on improved gut barrier *** microbiome analysis,we found that EMBP supplementation improved gut microbiome dysbiosis in Met S mice,specifically upregulating Bacteroides *** fecal microbiota transplantation(FMT)also demonstrated this *** addition,metabolomic analysis showed that EMBP mediates metabolic profiling reprogramming in Met S ***,a microbiota-derived metabolite,gamma-aminobutyric acid(GABA),is enriched by *** addition,exogenous GABA treatment produced a similar protective effect to EMBP by improving NRF2-dependent gut barrier function to protect HFDinduced Met *** results suggest that EMBP suppress host Met S by remodeling of gut microbiota as an effective candidate for next-generation medicine food dual purpose dietary supplement to intervene in MetS.

关键词： Metabolic syndrome Gut microbiota Extract of millet bran protein Gamma-aminobutyric acid Gut barrier function

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铸钢车轮的显微组织研究

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钢铁 2000年第3期35卷 43-45页

作者：钱立和孟江英中国科学院金属研究所马鞍山钢铁股份有限公司

在分析美国 Abex公司和 Griffin公司铸钢车轮的性能、化学成分的基础上 ,对这两家铸钢车轮的显微组织进行了研究。结果表明 ,铸钢车轮显示高强度、高硬度与低塑性、低韧性的特点 ,其原因是由于碳含量较高和少量合金元素 Cr、Ni、Mo和 C... 详细信息

在分析美国 Abex公司和 Griffin公司铸钢车轮的性能、化学成分的基础上 ,对这两家铸钢车轮的显微组织进行了研究。结果表明 ,铸钢车轮显示高强度、高硬度与低塑性、低韧性的特点 ,其原因是由于碳含量较高和少量合金元素 Cr、Ni、Mo和 Cu的存在 ,以及原始铸造组织的粗大 ,使得铸钢车轮热处理后踏面形成索氏体 (或与上贝氏体的混合 )组织 ,辐板部位为粗大珠光体。

关键词：铸钢车轮性能显微组织铁路运输

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涉农高职院校的使命认知、价值呼应与变革方向

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高等工程教育研究 2024年第2期 156-160页

作者：赵降英温州大学党委浙江乡村振兴职业教育研究院

建设农业强国是全面建成社会主义现代化强国的重要组成部分,是关涉经济社会各层面和主体的系统性工程。涉农高职院校作为培养现代农业高素质技术技能人才、构建农业产教融合特色体系助力乡村振兴、形成科教融汇成果带动农民共富和乡村... 详细信息

建设农业强国是全面建成社会主义现代化强国的重要组成部分,是关涉经济社会各层面和主体的系统性工程。涉农高职院校作为培养现代农业高素质技术技能人才、构建农业产教融合特色体系助力乡村振兴、形成科教融汇成果带动农民共富和乡村和美的重要主体。应在建设农业强国使命驱动下增强办学适应性,通过培育“智慧新农匠”统合学历教育、社会培训、技术推广、科技服务,形成政策支持引导下创新链、人才链、资金链的互动,共同激发多重理性驱动下多元主体的合作精神与集体创新意识,弥合利益鸿沟,形成建设农业强国的合力。

关键词：农业强国农业职业教育涉农高职院校智慧新农匠

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Transport properties of Hall-type quantum states in disordered bismuthene

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Chinese Physics B 2024年第4期33卷 16-23页

作者：周娇娇余江应成淑光江华 Key Laboratory of Advanced Electronic Materials and Devices School of Mathematics and PhysicsAnhui Jianzhu UniversityHefei 230601China Department of Physics Northwest UniversityXi'an 710069China School of Physical Science and Technology Soochow UniversitySuzhou 215006China

Bismuthene,an inherently hexagonal structure characterized by a huge bulk gap,offers a versatile platform for investigating the electronic transport of various topological quantum *** nonequilibrium Green's function method and Landauer-Büttiker formula,we thoroughly investigate the transport properties of various Hall-type quantum states,including quantum spin Hall(QSH)edge states,quantum valley Hall kink(QVHK)states,and quantum spin-valley Hall kink(QSVHK)states,in the presence of various *** on the exotic transport features,a spin-valley filter,capable of generating a highly spin-and valley-polarized current,is *** valley index and the spin index of the filtered QSVHK state are determined by the staggered potential and the intrinsic spin-orbit coupling,*** efficiency of the spin-valley filter is supported by the spacial current distribution,the valley-resolved conductance,and the spin-resolved *** with a sandwich structure for QSVHK,our proposed spin-valley filter can work with a much smaller size and is more accessible in the experiment.

关键词： electronic transport bismuthene spin-valley filter

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Mn含量对Fe-Mn-C孪生诱发塑性钢拉伸变形行为的影响

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金属学报 2018年第12期54卷 1777-1784页

作者：李冬冬钱立和刘帅孟江英张福成燕山大学亚稳材料制备技术与科学国家重点实验室秦皇岛066004 燕山大学国家冷轧板带装备及工艺工程技术研究中心秦皇岛066004

利用室温单向拉伸实验,结合OM、TEM、SEM-EBSD等观察手段,对比研究了2种Mn含量(13Mn和22Mn,质量分数,%) Fe-Mn-C系高锰奥氏体孪生诱发塑性(TWIP)钢的拉伸性能、孪生演化规律及应变硬化行为。结果表明,随Mn含量的增加,钢的屈服强度与抗... 详细信息

利用室温单向拉伸实验,结合OM、TEM、SEM-EBSD等观察手段,对比研究了2种Mn含量(13Mn和22Mn,质量分数,%) Fe-Mn-C系高锰奥氏体孪生诱发塑性(TWIP)钢的拉伸性能、孪生演化规律及应变硬化行为。结果表明,随Mn含量的增加,钢的屈服强度与抗拉强度降低而断裂延伸率增加。在低应变时,Mn含量的增加延缓了钢中形变孪晶的形成;但在高应变时,Mn含量的增加加快了孪晶的形成速率,进而使高锰钢中的孪晶体积分数反而比低锰钢中的高。同时,形变孪晶的厚度随Mn含量的增加而增加。最后,对2种Mn含量的Fe-Mn-C系TWIP钢的孪生及拉伸变形行为进行了讨论。

关键词：高锰钢孪生诱发塑性钢形变孪晶拉伸性能应变硬化动态应变时效

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关节间隙宽度测量对内侧膝关节单髁置换效果及预后的影响

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中国组织工程研究 2024年第36期28卷 5877-5883页

作者：徐耿彬茹江英广州医科大学附属第六医院清远市人民医院骨关节科广东省清远市511518

背景:与全膝关节置换相比,膝关节单髁置换具有康复快、成本低、本体感觉好等优点,但其术后高翻修率也是不容忽视的问题。目前对于导致膝关节单髁置换后高翻修率的原因尚不完全明确,因此术前严格把握手术指征对改善膝关节单髁置换后疗效... 详细信息

背景:与全膝关节置换相比,膝关节单髁置换具有康复快、成本低、本体感觉好等优点,但其术后高翻修率也是不容忽视的问题。目前对于导致膝关节单髁置换后高翻修率的原因尚不完全明确,因此术前严格把握手术指征对改善膝关节单髁置换后疗效和降低翻修率至关重要。作为常用的影像学测量手段,关节间隙宽度的评估可能对膝关节单髁置换手术指征的选择具有重要的临床参考价值。目的:综述关节间隙宽度的测量方法及对判定内侧膝关节单髁置换疗效和预后的影响。方法:通过万方和PubMed数据库检索1950-01-01/2023-06-01发表关于膝关节单髁置换疗效评价因素和关节间隙宽度对膝关节单髁置换疗效影响的相关文献,通过将文献汇总、分析,对关节间隙宽度的测量方法、术前内侧间室关节间隙宽度对内侧膝关节单髁置换疗效的影响、内侧膝关节单髁置换后外侧间室关节间隙宽度变化对预后的影响做以综述。结果与结论:①尽管目前用于研究和测量膝关节关节间隙宽度的方法很多,但负重位下X射线片测量关节间隙宽度仍是日常骨科实践中评估骨关节炎进展的常用方法,其可适度反映软骨厚度。②术前膝关节内侧间室关节间隙宽度会影响内侧活动平台膝关节单髁置换后的疗效,内侧关节间隙宽度/外侧关节间隙宽度<40%或内侧关节间隙宽度≤2mm的膝骨关节炎患者,可能更适合行内侧活动平台膝关节单髁置换。③内侧膝关节单髁置换后外侧间室关节间隙宽度变化对预后产生一定影响,术后通过改善外侧间室的关节匹配度,可延缓外侧间室关节退变的进展、降低假体翻修率,但尚欠缺相关的临床研究。总之,关节间隙宽度的影像学测量对判定内侧膝关节单髁置换的术后疗效和预后具有重要的临床参考价值。

关键词：关节间隙宽度单髁置换内侧膝关节疗效预后

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乡村振兴背景下乡村优秀教师群体特征与支持策略

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河北师范大学学报（教育科学版） 2024年第1期26卷 97-105页

作者：孔露冯江英新疆师范大学教育科学学院新疆乌鲁木齐830017 川北幼儿师范高等专科学校学前教育学院四川广元628017

乡村优秀教师是推动乡村教育发展的关键力量,了解其群体特征并构建完善的发展支持体系对于加强乡村教师队伍建设、提高乡村教育质量、助力乡村振兴具有重要意义。运用NVivo分析软件对荣获全国“最美教师”称号的54位乡村优秀教师典型事... 详细信息

乡村优秀教师是推动乡村教育发展的关键力量,了解其群体特征并构建完善的发展支持体系对于加强乡村教师队伍建设、提高乡村教育质量、助力乡村振兴具有重要意义。运用NVivo分析软件对荣获全国“最美教师”称号的54位乡村优秀教师典型事迹材料进行收集整理、编码分析,发现乡村优秀教师群体在乡土情怀、教育信念、师德修养、教学专长、社会认可五个方面具有明显特征,其中乡土情怀是乡村优秀教师的内在动力,教育信念是乡村优秀教师的发展之基,师德修养是乡村优秀教师的立身之本,教学专长是乡村优秀教师的专业支撑,社会认可是乡村优秀教师的价值体现,进而勾勒出乡村优秀教师群体特征理论模型。基于此,为培育、稳定和激励更多乡村优秀教师,建议创新职前教育特色,培植乡土情怀;唤醒教师主体自觉,生成教育信念;回归现实生活世界,加强师德修养;关照乡村教育需求,聚焦教学专长;倡导多元主体支持,赢取社会认可。

关键词：乡村振兴乡村优秀教师群体特征支持策略 NVivo分析

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