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Delayed plasticity during spherical nanoindentation of an iron-chromium-aluminum alloy:Effect of ferric ion irradiation

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journal of Materials Science & Technology 2023年第36期167卷 228-236页

作者： Y.Zhang C.W.Li j.L.jiang j.F.Gu H.wang Y.D.jia G.wang X.G.An q.wang j.Lu Institute of Materials Shanghai UniversityShanghai 200072China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering City University of Hong KongKowloonSARChina Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu610106China

Spherical nanoindentation of an iron-chromium-aluminum alloy was conducted to study the effect of ferric-ion(Fe 3+)irradiation on the time-dependent plasticity behavior in the surface layers of this *** was observed that the initiation of plasticity by the appearance of displacement burst or“pop-in”event occurred after a period of waiting time in the apparent elastic regime and that Fe^(3+)irradiation at 360°C and up to∼0.5 displacements per atom could make it happen under the lower applied loads but with a reduced *** the experimental data,an activation volume and activation energy were extracted for the delayed *** results show that Fe^(3+)-irradiation significantly reduced its acti-vation volume from∼3.05 b 3 to∼1.75 b 3(where b=Burgers vector),but slightly increased its activation energy from∼0.65 to∼0.71 *** the other hand,high-resolution scanning transmission electron mi-croscopy observations reveal that the irradiation at the elevated temperature created interstitial atom pair onto the(100)habit plane that can serve as the nucleation site of a100dislocation loop while elim-inating the pre-existing ***,it is indicated that heterogeneous nucleation of the dislocation loop was predominant in the delayed plasticity initiation of this alloy and that the nucleation of the interstitial-type dislocation loop was involved due to Fe^(3+)-irradiation.

关键词： Spherical nanoindentation Delayed plasticity FeCrAl alloy Fe^(3+)-irradiation

Research on Service Life Prediction Model of Concrete Structure of Sea-crossing Bridge

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武汉理工大学学报 2010年第17期32卷 141-146页

作者： wang C j ZHANG G Z LIU K X TU L q LI j H qIN M q Zhejiang Province Zhoushan Island Linking Construction Commanding Department Zhejiang 316032China Wuhan Harbor Engineering Design & Research Institute Co. Ltd Wuhan 430071China Key Lab of Large-span Bridge Construction Technology Ministry of CommunicationWuhan 430071China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

According to the chloride corrosion environment,service life prediction model of concrete structure of sea-crossing bridge was built using modified Fick's second law and the whole probability calculation method,which was suitable for China. Furthermore,a visual service life prediction program of concrete structure was developed by optimized Monte Carlo method. Meanwhile,Life 365 program was compared,indicating reliability of the prediction program. Finally,the validity of prediction model was verified in jinTang Bridge of Zhoushan Island Mainland Linkage Project.

关键词： sea-crossing bridge concrete structure service life prediction model verify

Effects of vitamin family members on insulin resistance and diabetes complications

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World journal of Diabetes 2024年第3期15卷 568-571页

作者： Hong-jin Chen Min wang Ding-Min Zou Gui-You Liang Si-Yuan Yang Division of Cardiac Surgery Guizhou Institute of Precision MedicineThe Affiliated Hospital of Guizhou Medical UniversityGuiyang 550009Guizhou ProvinceChina Translational Medicine Research Center Guizhou Medical UniversityGuiyang 550025Guizhou ProvinceChina School of Basic Medical Sciences/School of Biology and Engineering Guizhou Medical UniversityGuiyang 550025Guizhou ProvinceChina

The following letter to the editor highlights the article“Effects of vitamin D supplementation on glucose and lipid metabolism in patients with type 2 diabetes mellitus and risk factors for insulin resistance”in World j Diabetes 2023 Oct 15;14(10):*** is necessary to explore the role of vitamin family members in insulin resistance and diabetes complications.

关键词： Vitamin Insulin resistance Diabetes complications Letter

EFFECT OF SILICON ON PRODUCING DUCTILE IRON WITH COMPLEX STRUCTURE OF BAINITE AND MARTENSITE

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 25-28页

作者： Y.P.Zhang j.X.Zhu Y.q.wang j.Y.Su Xi'an Univ of Technology Xi'an China

This paper deals with an important role of silicon in producing ductile iron with quenched complex structure of bainite and martensite. The samples are cast in permanent mold and quenched in solution of sodium silicate. The result of thc experiments shows that the austenizing temperature should rise with increasing silicon content, otherwise much undissolved ferrite is present in the matrix after quenching. However the undissolvec ferrite can be decreased greatly or even eliminated by adding appropriate amount of ooron. On this condition, the amount of bainite gets increasing and the amount of residual austenite decreasing with the silicon cortent increasing. An approach has also been made to the mechanism of the effect of silicon on the transformation of bainite in ductile iron. The T.T.T. curves measured show that the increase of sllicon content causes the curve to shift to the left. This is quite different from the fact in steel.

关键词： ductile iron,silicon content bainite martensite

Stress Corrosion Cracking of X80 Pipeline Steel in Near-Neutral pH Environment under Constant Load Tests with and without Preload

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journal of Materials Science & Technology 2011年第11期27卷 1039-1046页

作者： Y.Z. jia j.q. wang E.H. Han W. Ke1 State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Department of Electromeehanical Engineering Siehuan College of Architectural Technology Deyang 318000 China

Constant load tests in NS4 solution purged with N2-5%CO2 gas mixture were conducted on American Petroleum Institute （API） X80 pipeline steel applied in the 2nd West-East （;as Pipeline project with and without preload. The results show that cracks could initiate and propagate in X80 pipeline steel in near-neutral pH environment under a constant load condition. The life of crack initiation and propagation increased with decreasing applied stress. Preload did not change its corrosion behavior obviously. However, preload reduced the time for crack initiation.

关键词： Stress corrosion cracking X80 pipeline steel Near-neutral pH solution Preload

Effect of Silver Content on Microstructure and Properties of Brass/steel Induction Brazing joint Using Ag-Cu-Zn-Sn Filler Metal

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journal of Materials Science & Technology 2011年第4期27卷 377-381页

作者： j. Cao L.X. Zhang H.q. wang L.Z. Wu j.C. Feng State KeyLab of AdvanCed Welding Production Technology Harbin Instituteof Technology Harbin 150001 China Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150001 China

The induction brazing of brass to steel using Ag-Cu-Zn-Sn filler metal was investigated in this study. The influence of A8 content on the microstructure and properties were analyzed by means of optical microscopy, scanning electron microscopy and electron probe microanalysis. Defect free joint was achieved using Ag- Cu-Zn-Sn filler metal. The microstructure of the joint was mainly composed of Ag-based solid solution and Cu-based solid solution. The increase of A8 content and the cooling rate both led to the increase of the needle like eutectic structure. The tensile strength decreased with the increase of Ag content. The tensile strength at room temperature using Ag25CuZnSn filler metal reached 445 MPa. All fractures using Ag-Cu-Zn-Sn filler metal presented ductile characteristic.

关键词： Induction brazing Brass Steel Microstructure Tensile strength

DEFORMATION-INDUCED α2→γ TRANSFORMATION IN A HOT DEFORMED Ti-45A1-10Nb ALLOY

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 19-24页

作者： j.G.wang L.CZhang G.L.Chen H.q.Ye Univ of Science and Technology Beijing Beijing China

High-resolution transmission electron microscope (HRTEM) was employed to investigate the deformation-induced α2→γ phase transformation phenomenon in a hot deformed Ti-45Al-10Nb alloy. Such a tronsformation can be nucleated either at α2/γ interfaces or at stacking faults on the basal planes of the α2 phase. The growth of deformation-induced γplate is accomplished by the motion of α/6 Shockley partials on alternate basal planes (0001)α2, and the α/6 Shockley partials move in coordination rather than sweep on (0001)α2 plane one by one. It appears that no atom transportation is involved in this stress-induced α2→γ transfromation.

关键词： intermetallic compound titanium aluminide Ti-45Al-10Nb alloy stress-induced phase transformation interface HRTEM

基于状态空间模型的激光再制造熔池温度控制系统

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表面工程与再制造 2024年第2期24卷 50-50页

作者： Yang G.-Z. Liu T.-M. Song B.-X. jiang X.-Y. wang Z.-S. Chen K.-q. Liu W.-j. School of Mechanical Engineering Shenyang University of Technology Shenyang China

激光再制造是用于再制造的一项重要技术,在航空航天、冶金、能源等领域应用广泛。然而,形状控制问题一直是制约其规模化和工业化应用的瓶颈。在激光再制造过程中,熔池温度是决定再制造件形状和性能稳定性的关键。基于此,本文提出了一种... 详细信息

激光再制造是用于再制造的一项重要技术,在航空航天、冶金、能源等领域应用广泛。然而,形状控制问题一直是制约其规模化和工业化应用的瓶颈。在激光再制造过程中,熔池温度是决定再制造件形状和性能稳定性的关键。基于此,本文提出了一种基于状态空间模型的激光再制造熔池温度实时在线控制方法,解决了控制机理模型难以建立和多变量约束的问题。

关键词：状态空间模型激光再制造熔池温度航空航天形状控制控制系统变量约束性能稳定性

Improving weld formability by a novel dual-rotation bobbin tool friction stir welding

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journal of Materials Science & Technology 2018年第1期34卷 135-139页

作者： F.F.wang W.Y.Li j.Shen q.Wen j.F.dos Santos State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Helmholtz-Zentrum Geesthacht Institute of Materials Research Materials Mechanics China Academy of Launch Vehicle Technology Beijing Institute of Astronautical Systems Engineering

A novel dual-rotation bobbin tool friction stir welding （DBT-FSW） was developed, in which the upper shoulder （US） and lower shoulder （LS） have different rotational speeds. This process was tried to weld 3.2 mm thick alunlinum-lithium alloy sheets. The metallographic analysis and torque measurement were carried out to characterize the weld formabiliW. Experimental results show that compared to conven- tional bobbin tool friction stir welding, the DBT-FSW has an excellent process stability, and can produce the defect-free joints in a wider range of welding parameters. These can be attributed to the significant improvement of material flow caused by the formation of a staggered layer structure and the unbalanced force between the US and LS during the DBT-FSW process.

关键词： Bobbin tool friction stir welding Dual rotation Material flow Microstructure Microhardness