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Compositional Variants of Cu-rich Precipitate in Thermally Aged Ferritic Steel

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Acta Metallurgica Sinica(English Letters) 2018年第5期31卷 465-470页

作者： Qingdong liu Yihua Chen chuanwei li Jianfeng Gu Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong University Scholl of Nuclear Science and Engineering Shanghai Jiao Tong University

Atom probe tomography was utilized to investigate Cu precipitation in a high-strength low-alloy steel isothermally aged at 500℃ for 1, 4, 16, and 64 h after water-quenching from 900℃. With prolonged aging time, the Curich precipitates（CRPs） increased in size and decreased in number density, and gradually evolved from spheroidal to elliptical in morphology. The small CRPs were rich in a high amount of Fe and a certain amount of Ni and Mn at their early nucleation stage. The large CRPs with increased size due to extensive aging contained less Fe and more Cu at their later growth stage. Additionally, Ni and Mn were both readily to segregate at the CRP/matrix heterophase interfaces, and Mn was higher in content than Ni in the precipitate interior especially when the CRPs were large in size.

关键词： High-strength low-alloy steel Thermal aging Cu-rich precipitate Atom probe tomography

Visualization of microstructural factors resisting the crack propagation in mesosegregated high-strength low-alloy steel

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Journal of Materials Science & Technology 2020年第7期42卷 75-84页

作者： Shuxia Wang chuanwei li lizhan Han Haozhang Zhong Jianfeng Gu Institute of Materials Modification and Modeling School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai200240China Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration Shanghai Jiao Tong UniversityShanghai200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai200240China

While relationship between fracture mechanism and homogeneous microstructures has been fully understood,relationship between fracture mechanism and inhomogeneous microstructures such as the mesosegregation receives less attention as it *** mechanism of the high-strength low-alloy(HSLA)steel considering the mesosegregation was investigated and its corre s ponding micro structure was characterized in this *** re fers to the inhomogeneous distribution of alloy elements during casting solidification,and leads to the formation of positive segregation zones(PSZ)and negative segregation zones(NSZ)in *** fracture surface of impact sample exhibits the quasi-cleavage fracture at-21℃,and is divided into ductile and brittle fracture ***,the PSZ and NSZ spread across ductile and brittle fracture zone *** ductile fracture zone,micro-voids fracture mechanism covers the PSZ and NSZ,and higher deformation degree is shown in the *** brittle fracture zone,secondary cleavage cracks are observed in both PSZ and NSZ,but present bigger size and higher quantity in the ***,some regions of the PSZ still present micro-voids fracture mechanism in brittle fracture *** reveals that the microstructures in the PSZ exhibit a higher resistance ability to crack propagation than that in the *** observations above provide a better visualization of the microstructural factors that resist the crack *** is important to map all information regarding the fracture mechanism and mesosegregation to allow for further acceptance and industrial use.

关键词： High-strength low-alloy steel Heavy forgings Mesosegregation Inhomogeneous microstructures Fracture mechanism

Chemical, microstructure, and mechanical property of TiAl alloys produced by high-power direct laser deposition

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Journal of Materials Science & Technology 2022年第22期117卷 99-108页

作者： Xinyu Zhang chuanwei li Mengyao Zheng Xudong Yang Zhenhua Ye Jianfeng Gu Institute of Materials Modification and Modeling School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China

Additive manufactured metals sometimes exhibit extraordinary microstructures and mechanical properties due to the particular processes. In this paper, we focus on a novel gradient TiAl alloys fabricated byhigh-power direct laser deposition, whose chemical composition, microstructure, and mechanical property vary along the building direction. The results indicate that Al concentration dramatically decreasesfrom 39.5 at.% to 30.1 at.% as the height increases from the bottom to the top. Meanwhile, microstructural characterization indicates that the specimen appears basket-weave microstructure at the bottom,then the α_(2) and γ phase gradually decrease, and eventually it transforms into acicular martensite microstructure in the top region. The indentation analysis shows that the associated hardness increases asthe height increases, while the plasticity reaches a minimum value in the middle region. The increasingamount of β_(o)(ω) is considered to be responsible for the increasing hardness because of the strong precipitation strengthening effect. The high plasticity in the bottom and top regions results from the strongdeformation behaviors of the γ and β_(o) phases.

关键词： Direct laser deposition TiAl alloys Inhomogeneity Microstructure Mechanical properties

LASER, a novel non coding RNA in 11q12, regulate PCSK9 expression and cholesterol homeostasis in hepatocytes

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中国循环杂志 2016年第Z1期31卷 -页

作者： chuanwei li Gengze Wu Chunyu Zeng Daping Hospital The Third Military Medical University Chongqing China

女性同卵双胞胎精神分裂症携带22q11.2和4p15.3平衡易位2例

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中华精神科杂志 2025年第1期58卷 47-50页

作者：殷旭圆李传威杨清蔡源侯文龙满丽娟庄楠楠曹佳琪祁琪朱振华惠李苏州大学附属广济医院生物精神医学研究中心苏州215137 苏州大学附属广济医院精神科苏州215137

精神分裂症是一种全球范围内常见的、重型的、复杂的精神疾病。遗传因素约占精神分裂症病因的80%,但其仍缺乏客观诊断标志物。本文报告2例女性同卵双胞胎患精神分裂症,22q11.2和4p15.3之间发生平衡易位。我们结合文献对患者染色体平衡... 详细信息

精神分裂症是一种全球范围内常见的、重型的、复杂的精神疾病。遗传因素约占精神分裂症病因的80%,但其仍缺乏客观诊断标志物。本文报告2例女性同卵双胞胎患精神分裂症,22q11.2和4p15.3之间发生平衡易位。我们结合文献对患者染色体平衡易位区域与精神疾病发病相关性进行分析和讨论,从而促进精神科医生从新视角去思考精神分裂症的诊断。

关键词：精神分裂症同卵双胞胎染色体畸变平衡易位

Controlling the surface buckling wrinkles by patterning the material system of hard-nano-film/soft-matter-substrate

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Science China(Physics,Mechanics & Astronomy) 2014年第4期57卷 637-643页

作者： WU Dan YIN YaJun XIE HuiMin SHANG YuanFang li chuanwei WU liFu DAI XiangLu Key Laboratory of Applied Mechanics (AML) Department of Engineering Mechanics Tsinghua University The State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University

Wrinkling and buckling of nano-films on the compliant substrate are always induced due to thermal deformation *** paper proposes effective means to control the surface wrinkling of thin film on the compliant substrate,which exploits the curvatures of the curve cracks designed on the stiff *** procedures of the method are summarized as:1)curve patterns are fabricated on the surface of PDMS(Polydimethylsiloxane)substrate and then the aluminum film with the thickness of several hundred nano-meters is deposited on the substrate;2)the curve patterns are transferred onto the aluminum film and lead to cracking of the film along the *** cracking redistributes the stress in the compressed film on the substrate;3)on the concave side of the curve,the wrinkling of the film surface is suppressed to be identified as shielding effect and on the convex side the wrinkling of the film surface is induced to be identified as inductive *** shielding and inductive effects make the dis-ordered wrinkling and buckling *** phenomenon provides a potential application in the fabrication of flexible electronic devices.

关键词： mismatch of thermal deformation wrinkling and buckling inductive effect shielding effect

Analysis on diffusion-induced stress for multi-layer spherical core-shell electrodes in li-ion batteries

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Chinese Physics B 2021年第9期30卷 587-593页

作者： Siyuan Yang chuanwei li Zhifeng Qi lipan Xin linan li Shibin Wang Zhiyong Wang Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300350China Tianjin Key Laboratory of Modern Engineering Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300350China

Silicon-based carbon composites are believed as promising anodes in the near future due to their outstanding specific capacity and relatively lower volume effect compared to pure silicon ***,a multilayer spherical core-shell(M-SCS)electrode with a graphite framework prepared with Si@O-MCMB/C nanoparticles is developed,which aims to realize chemically/mechanically stability during the lithiation/delithiation process with high specific *** electrochemical-/mechanical-coupling model for the M-SCS structure is established with various chemical/mechanical boundary *** simulation of finite difference method(FDM)has been conducted based on the proposed coupling model,by which the diffusion-induced stress along both the radial and the circumferential directions is ***,factors that influence the diffusion-induced stress of the M-SCS structure have been discussed and analyzed in detail.

关键词： multi-layer spherical core-shell electrode diffusion-induced stress

Characteristic investigation of trilayered Cu/Al8011/Al1060 composite:Interface morphology, microstructure, and in-situ tensile deformation

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Progress in Natural Science:Materials International 2021年第5期31卷 679-687页

作者： Mahmoud Ebrahimi Guoping liu chuanwei li Qudong Wang Haiyan Jiang Wenjiang Ding Fengling Su Zhengping Shang National Engineering Research Center of light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University Institute of Materials Modification and Modeling School of Materials Science and Engineering Shanghai Jiao Tong University Sichuan Winner Special Electronic Materials Co. Ltd. Jiangsu Zhongse Composite Materials Co. Ltd.

In this work, Cu/Al8011/Al1060 trilayered composite with an ultrathin copper layer was fabricated successfully by the hybrid process of cast-rolling and hot-roll-bonding. The effects of heat treatment were investigated on the microstructure and mechanical behavior of the composite. The results showed that annealing temperatures above 300°C led to the formation of new intermetallic compounds that joined their initial counterparts. Also, the interface growth was fast above 340°C. It was found that the annealing temperature of 320°C led to the optimal tensile properties of the composite. Through rolling, hard-brittle IMCs imposed intense plastic strains on the surrounding regions, resulting in further grain refinement of both metals in the vicinity of the interface. Although the kernel average misorientation of the trilayered composite was almost identical with the Cu/Al8011 bimetal,its amount was considerably decreased after heat treatment, as the distorted structure changed into a nearly strain-free one using the restoration phenomenon. The SEM-based in-situ tensile test showed that crack initiation occurred within the IMCs and propagated into the Cu strip, leading to its early fracture. However, the strengthdisplacement curve during in-situ tensile deformation did not decrease significantly due to the ultrathin copper layer.

关键词： Heat-treatment Intermetallic compounds Mechanical properties Kernel average misorientation Microstructure analysis Crack initiation

Competitive Formation of Reverted Austenite with Cu-rich Precipitate and Alloyed Carbide in a HSLA Steel during Intercritical Heat Treatment

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Competitive Formation of Reverted Austenite with Cu-rich Pre...