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Journal of Materials Science & Technology 2018年第5期34卷 745-755页

作者： V.S.Y.Injeti Z.C.Li b.yu R.D.K.Misra Z.H.Cai H.Ding Department of Metallurgical Materials and Biomedical Engineering500 W. University Avenue USA School of Materials Science and Engineering Northeastern University Shenyang 110819 China

This work aims to elucidate the impact of aluminum-content on microstructure and deformation mechanisms of transformation-induced plasticity（TRIP） steels through macroscale and nanoscale deformation experiments combined with post-mortem electron microscopy of the deformed *** solid-state transformation-induced mechanical deformation varied with the Al contents,and influenced tensile strength-ductility *** with 2–4 wt% Al were characterized by TRIP *** contrast to 2 Al-TRIP and 4 Al-TRIP steels,twinning-induced plasticity（TWIP） was also observed in conjunction with strain-induced martensite in 6 Al-TRIP *** behavior is attributed to the increase in stacking fault energy with the increase of Al content and stability of austenite,which depends on the local chemical *** study addresses the knowledge gap with regard to the effect of Al content on austenite stability in medium-Mn TRIP *** combination is expected to potentially enable cost-effective alloy design with high strength-high ductility condition.

关键词： Medium-manganese steels Aluminum content Electron microscopy Mechanical properties Nanoscale deformation TRIP steel Twinning

THE REINFORCING MECHANISM OF Tib2 IN Tib2/A357 COMPOSITE

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Acta Metallurgica Sinica(English Letters) 2003年第5期16卷 375-378页

作者： b.yu Y.J.Zhang Z.X.Zhao~ F.X.Zhao: Q.K.Cai C.S.Liu ShenyangResearchInstituteofFoundry TheChineseAcademyofMachinerySciencesShenyang110022China EastChinaUniversityofScienceandTechnology Shanghai200237China SchoolofMaterials&Metallurgy NortheasternUniversityShenyang110004China

Mechanical properties were tested for in situ Tib2/A357 composite fabricated by LSM (mixed salts reaction) method. Micro structures of as cast and plastic deformed Tib2/A357 were investigated. The results show that there is a low misfit between (200) Al and (101)Tib2 with [011]//Al [101]Tib2. There is a change from fully dendritic structure of the α-Al of A357 to a rosette-type structure of Tib2/A357. Significant increases in proof stress and Young's modulus can be obtained at low Tib2 additions. There exist dislocation loops around neighboring Tib2 particles with about 0.1μm in diameter and dislocation multiplication near Tib2 particles.

关键词： Tib2/Al in situ composite reinforcing mechanism

Grain boundary and microstructure engineering of Inconel 690 cladding on stainless-steel 316L using electron-beam powder bed fusion additive manufacturing

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Journal of Materials Science & Technology 2019年第2期35卷 351-367页

作者： I.A.Segura L.E.Murr C.A.Terrazas D.bermudez J.Mireles V.S.V.Injeti K.Li b.yu R.D.K.Misra R.b.Wicker W.M.Keck Center for 3D Innovation The University of Texas at El Paso Department of Mechanical Engineering The University of Texas at El Paso Department of Metallurgical Materials and Biomedical Engineering The University of Texas at El Paso

This research explores the prospect of fabricating a face-centered cubic(fcc) Ni-base alloy cladding(Inconel 690) on an fcc Fe-base alloy(316 L stainless-steel) having improved mechanical properties and reduced sensitivity to corrosion through grain boundary and microstructure engineering concepts enabled by additive manufacturing(AM) utilizing electron-beam powder bed fusion(EPbF). The unique solidification and associated constitutional supercooling phenomena characteristic of EPbF promotes[100] textured and extended columnar grains having lower energy grain boundaries as opposed to random, high-angle grain boundaries, but no coherent {111} twin boundaries characteristic of conventional thermo-mechanically processed fcc metals and alloys, including Inconel 690 and 316 L *** addition to [100] textured grains, columnar grains were produced by EPbF fabrication of Inconel 690 claddings on 316 L stainless-steel substrates. Also, irregular 2–3 μm diameter, low energy subgrains were formed along with dislocation densities varying from 108 to 109 cm^2, and a homogeneous distribution of Cr_(23)C_6 precipitates. Precipitates were formed within the grains(with ~3 μm interparticle spacing),but not in the subgrain or columnar grain boundaries. These inclusive, hierarchical microstructures produced a tensile yield strength of 0.527 GPa, elongation of 21%, and Vickers microindentation hardness of 2.33 GPa for the Inconel 690 cladding in contrast to a tensile yield strength of 0.327 GPa, elongation of 53%, and Vickers microindentation hardness of 1.78 GPa, respectively for the wrought 316 L stainlesssteel substrate. Aging of both the Inconel 690 cladding and the 316 L stainless-steel substrate at 685?C for50 h precipitated Cr_(23)C_6 carbides in the Inconel 690 columnar grain boundaries, but not in the low-angle(and low energy) subgrain boundaries. In contrast, Cr_(23)C_6 carbides precipitated in the 316 L stainless-steel grain boundaries, but not in the low energy

关键词： Additive manufacturing Electron-beam powder bed fusion (EPbF) Inconel 690 cladding 316L stainless steel Grain boundary engineering Materials characterization Mechanical properties

Syndiotactic polymerization of styrene with homogeneous metallocene catalysts

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Syndiotactic polymerization of styrene with homogeneous meta...

International Symposium on Engineering Plastics EP’2004 LANZHOU

作者： b.-G.Li K.Cao R.Fan b.yu State Key Laboratory of Chemical Engineering（Polymer Reaction Engineering Division）Zhejiang University

＜正＞Introduction With a melting point of 270℃,which is highest in all the homopolymer,syndiotactic polystyrene（sPS）has excellent heat resistance,chemical resistance,water/steam resistance and electronic/electric ...

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Panax ginseng PgTIP1 gene confers enhanced salt and drought tolerance to transgenic soybean plants through maintaining homeotasis of water,salt ions and ROS

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Panax ginseng PgTIP1 gene confers enhanced salt and drought ...

第七届长三角植物科学研讨会暨青年学术报告会

作者： J.An C.Cheng Z.Hu H.Chen W.Cai b.yu Lab of Plant Stress biology College of Life SciencesNanjing Agricultural University Institute of Plant Physiology and Ecology Shanghai Institutes for Biological SciencesUniversity of Chinese Academy of SciencesChinese Academy of Sciences

Panax ginseng PgTIP1 gene was formerly demonstrated to possess high water channel activity by its heterologous expression in Xenopus laevis oocytes and in yeast;and also plays significant roles in enhanced salt/drought tolerance of Pg TIP1-transgenic Arabidopsis plants and salt adaptation of Pg TIP1-transformed Glycine *** this work,Pg TIP1 gene was further transformed into the hybrid strain 4076(F),which was selected for salt tolerance generation by generation from the cross assembly *** N23674×*** bb52 *** Pg TIP1-transgenic soybean plants mediated by the pollen tube pathway,represented by the lines L19 and L29,were simultaneously analyzed at the physiological and molecular levels for enhanced salt and drought *** results showed that,the salt-stressed Pg TIP1-transgenic L19 and L29 have acquired better leaf stomatal movement and water-gas exchange capacity,obvious drops of absorption,transport and accumulation of Na,Cland Na/K ratio,and enhanced antioxidase activities of SOD,POD,CAT,and APX in the roots or leaves in contrast to *** suffered from PEG-induced drought stress,the strengthened leaf water-retention capacity and the alleviated cell membrane damages of roots and leaves were displayed for Pg TIP1-transgenic soybean ***,the Pg TIP1-transgenic soybean lines could exhibit salt and drought tolerance together,which are not only related to the primary functions of Pg TIP1 gene involved in water status regulation,but also to its secondary roles in up-regulated expression of stress-related genes(Gm NHX1,Gm SOS1,Gm CLC1,Gm CAT1,Gm APX1,Gm NCED1 and Gm P5 CS1),which are involved in homeostasis of Na,K,and Cl,ROS scavenging,and synthesis of AbA and proline,etc.

关键词： PgTIP1 transformation salt tolerance drought tolerance transgenic soybean water relations ion homeostasis ROS scavenging

Structural characterization and electrochemical properties of ba0.5Sr0.5Co0.8Fe0.2O3-δ and its application for anode of SOEC

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Structural characterization and electrochemical properties o...

第九届全国氢能学术会议

作者： b.yu,M.Y.Liu,J.M.Xu,J.Chen Tsinghua University,China

＜正＞High temperature steam electrolysis（HTSE） has received increasing interest in recent years,which provides a potential way for the large-scale production of *** oxide electrolysis cells（SOEC） coupled with advanced high temperature nuclear reactor could achieve a competitive thermal-to-hydrogen conversion *** consumes less

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Physical property and microstructure analysis of hydrogen electrode support layer of solid oxide electrolysis cell for hydrogen production

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Physical property and microstructure analysis of hydrogen el...

第九届全国氢能学术会议

作者： M.Y.Liu,b.yu,J.M.Xu,J.Chen Tsinghua University,China

＜正＞Massive hydrogen production without fossil fuel consumptions and green house gas emissions was the key to achieving the hydrogen ***,massive hydrogen production technology could not meet the demand for the hydrogen economy. High-temperature gas-cooled reactor（HTGR） coupled with high-temperature steam electrolysis（HTSE） systems using solid oxide electrolysis cell（SOEC） and high-efficiency

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Preparation of NiO-YSZ metal composite powders by a new situ-precipitation method and its application for cathode of SOEC

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Preparation of NiO-YSZ metal composite powders by a new situ...

第九届全国氢能学术会议

作者： M.D.Liang,b.yu,J.Chen,J.M.Xu Tsinghua University,China

＜正＞High Temperature Steam Electrolysis（HTSE） through a solid oxide electrolytic cell （SOEC） has been receiving more and more attention recently because of its high conversion efficiency（45～59%） and its potential usage for large-scale hydrogen *** main works of this manuscript are NiO-YSZ/YSZ（yttria-stabilized zirconia） metal composite ceramics fabrication technique and its application in cathode/electrolyte system of planar

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R-134a在三种不同放置方式螺旋管内凝结换热的实验研究

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制冷学报 2004年第2期25卷 1-6页

作者：韩吉田 b.yu H.J.Kang C.X.Lin M.A.Ebadian 山东大学能源与动力工程学院济南250061 Hemispheric Center for Environmental Technology

对替代制冷剂R - 1 34a在螺旋管内的对流凝结换热特性进行了实验研究。在制冷剂R - 1 34a的质量流量变化范围为 1 0 0～ 4 0 0kg/ (m2 s)和冷却水的平均温度分别为 1 2℃和 2 2℃的条件下 ,实验得到了在三种不同放置方式螺旋管内 (水平 ... 详细信息

对替代制冷剂R - 1 34a在螺旋管内的对流凝结换热特性进行了实验研究。在制冷剂R - 1 34a的质量流量变化范围为 1 0 0～ 4 0 0kg/ (m2 s)和冷却水的平均温度分别为 1 2℃和 2 2℃的条件下 ,实验得到了在三种不同放置方式螺旋管内 (水平 ,垂直和倾斜 )R - 1 34a的对流凝结换热特性数据。实验结果表明 ,螺旋管的不同放置方式对R - 1 34a在螺旋管内的凝结换热特性具有重要的影响。通过与已有研究结果的比较 ,简要分析了螺旋管不同放置方式对R -1

关键词：制冷剂 R-134a 对流凝结换热替代制冷剂螺旋管相变传热

在美国和澳大利亚地区使用气候调节装置时R因子的预报

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中国水土保持 2002年第7期 38-38页

作者： b.yu Faculty of Environmental sciences Griffith university