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Enhanced comprehensive properties of directed energy deposited Inconel 718 by a novel integrated deposition strategy

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Journal of materials science & Technology 2023年第10期141卷 42-55页

作者： Naiyuan xi Kexin Tang Xuewei Fang Yan Li Yusong Duan Ke Huang The state key {2. for Manufacturing Systems engineering Xi’an Jiaotong UniversityXi’an 710054China

Nickel-based superalloys fabricated by wire-arc directed energy deposition,also known as wire arc ad-ditive manufacturing(WAAM),usually exhibit inherent columnar grain structure,micro-segregation,and rough surface.A novel deposition strategy,integrating an oscillating arc and forced interlayer cooling,was developed in WAAM of Inconel(IN)718 *** influences of deposition modes on geometrical characteristics,defects,microstructure,and mechanical properties were systematically *** re-sults showed that the oscillation mode,compared to the standard parallel mode,can effectively promote the molten pool’s spread and wettability,as well as prevent overflow,finally resulting in high geometric *** addition,the voids-like defects were reduced by 77.78%,while most common crack defects were not ***,the forced interlayer cooling process further increased the cooling rate,leading to the reduction of the element segregation as well as the proportion of long-chain-like Laves *** a short-process modified heat treatment,the anisotropic mechanical {2.s of the as-deposited samples were almost *** with the parallel mode samples,the yield strength and ultimate tensile strength of the oscillation path samples increased by 5.75%and 9.2.%,respectively,while the elongation increased significantly by 51.2.%.This signifies that their strength and ductility were simultaneously *** strengthening mechanisms were further analyzed based on the distribution of the strengthening phases,as well as the residual Laves phases and porosity.

关键词： Wire arc additive manufacturing Deposition strategy Microstructure characterization Strengthening mechanism Inconel 718

Research progress on supramolecular structures of asphalt

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Journal of Traffic and Transportation engineering(English Edition) 2023年第2期10卷 230-242页

作者： Yongjie Ding Yuan xi Yanghui Wang Rui Zhang Danni Li Department of Road and Urban Railway engineering Beijing University of TechnologyBeijing 100124China school of Civil engineering Chongqing Jiaotong UniversityChongqing 400074China The key laboratory of Road and Traffic {2. of Ministry of Education Tongji UniversityShanghai 201804China Department of Civil Environmental engineering The Hong Kong Polytechnic UniversityHong KongChina

The properties of asphalt binder play an essential role in the design life of asphalt *** of asphalt mechanical behaviors based on the chemical structures provides the theoretical basis for the improvement of asphalt performance in service *** interactions have a significant impact on the macroscopic properties of asphalt,a colloidal {2.,resulting in the parameters characterizing asphalt molecular structures fail to directly connect with mechanical properties of *** paper introduces the supramolecular theory,presents a brief review of existing supramolecular models and research methods of asphalt,aiming to explore a new methodology for the investigation between asphalt microstructures and macroscopic *** showed the supramolecular theory focuses on the intermolecular interactions,providing more accurate indicators for the investigation on the asphalt *** analysis of asphalt has proposed feasible methods and established favorable connections with asphalt properties,giving a new view of understanding asphalt microstructure and a new approach to capture mechanical behaviors of asphalt.

关键词： Road engineering Asphalt microstructure Supramolecule Intermolecular interaction Performance

An experimental method for measuring friction behaviors of linear rolling guides

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Chinese science Bulletin 2014年第29期59卷 3912-3918页

作者： Yinhu xi Yuan Zhou Wei Zhang Junhong Mao Theory of Lubrication and Bearing Institute Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing SystemSchool of Mechanical EngineeringXi’an Jiaotong University

Friction behaviors of linear rolling guides(LRGs)are determined by many factors and are crucial for precision *** is difficult to create an expression to describe the friction behaviors exactly and completely.A new experimental method for measuring the friction behaviors of one LRG individually was developed,and linear motor direct drive technology is utilized in the experiment *** position signal is acquired by a grating,and the friction of the LRG is deduced by the product of the mass of the moving part and its *** the experiment,the LRG can move with the friction only,and the friction transition from normal rolling to prerolling stage was *** asperities’deformations were utilized to explain *** loops and internal loops were *** results indicate the non-local memory of the LRG,and the historical trajectory have an important impact on the friction behaviors of LRGs in the pre-rolling stage.

关键词：直线滚动导轨摩擦行为测量验方精确定位驱动技术直线电机位置信号

Microstructure and Performance Analysis of Organic Coating under High Temperature and High CO_2.Partial Pressure

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Journal of Wuhan University of Technology(materials science) 2016年第6期31卷 1181-1186页

作者：李琼伟 ZHANG Jianxun LI Mingxing xi Yuntao ZHANG Zhengyun .state key {2. for mechanical behavior of materials Xi'an Jiaotong UniversityXi'an 710049China National engineering laboratory for Low-permeability Oil&Gas Exploration and Development Xi'an 710018China Oil&Gas Technology Research Institute Changqing Oilfield CompanyXi'an 710018China

To evaluate the property of the organic coatings in oil and gas plants, the aging process was studied in high temperature and high CO_2.partial pressure environment. Correlations were developed between the macroscopic properties and microstructure of the organic coatings. The surface appearance, mechanical properties, and permeability of the organic coatings were measured. Furthermore, the crystal structure of the organic coatings was investigated through synchrotron radiation grazing incidence X-ray diffraction（GIXRD） on the BL14B1 beam line in Shanghai Synchrotron Radiation Facility. Combined with the Fourier transform infrared spectroscopy, the molecular structure of the organic coatings was investigated. The experimental results indicate that the thickness variation and weight loss of the organic coatings increase with the immersion time, and the penetration resistance of the coating obviously decreases as the temperature rises. Moreover, the degradation of the organic coatings with immersion time in high temperature and high CO_2.partial pressure environment is caused by the amorphization of the organic coatings as the groups and bonds of the organic coatings were not damaged.

关键词： coating aging process microstructure mechanical property permeability

One-dimensional sp carbon:Synthesis,properties,and modifications

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Chinese Physics B 2022年第12期31卷 567-589页

作者： Chao-Fan Lv xi-Gui Yang Chong-xin Shan state key {2. of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of sciences Beijing 100049China Henan key laboratory of Diamond Optoelectronic {2. and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

Carbyne,as the truly one-dimensional carbon allotrope with sp-hybridization,has attracted significant interest in recent years,showing potential applications in next-generation molecular devices due to its ultimate one-atom *** excellent properties of carbyne have been predicted,however,free-standing carbyne sample is extremely unstable and the corresponding experimental researches and modifications are under-developed compared to other known carbon *** synthesis of carbyne has been slowly developed for the past ***,there have been several breakthroughs in in-situ synthesis and measurement of carbyne related materials,as well as the preparation of ultra-long carbon chains toward infinite *** progresses have aroused widespread discussion in the academic *** this review,the latest approaches in the synthesis of sp carbon are *** then discuss its extraordinary properties,including mechanical,electronic,magnetic,and optical properties,especially focusing on the regulations of these ***,we provide a perspective on the development of carbyne.

关键词： carbyne polyyne linear carbon chains

MoSe_(2./TiO_(2.heterostructure integrated in N-doped carbon nanosheets assembled porous core-shell microspheres for enhanced sodium storage

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Nano Research 2023年第7期16卷 9398-9406页

作者： Nianxiang Shi Guangzeng Liu Baojuan xi Xuguang An Changhui Sun xinzheng Liu Shenglin xiong school of Chemistry and Chemistry engineering Qilu Normal UniversityJinan 250200China school of Chemistry and Chemical engineering and State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China school of mechanical {2. Chengdu UniversityChengdu 610106China

engineering the structure and composition of electrode materials is one of the essential means for achieving excellent electrochemical *** rational design of Na+host materials is still a massive challenge for sodium ion batteries(SIBs).Herein,MoSe_(2./TiO_(2.heterostructure is integrated with N-doped carbon nanosheets to assemble into hierarchical flowerlike porous core-shell microspheres(MoSe_(2./TiO_(2.@N-C),which is firstly reported by room-temperature stirring coupled with vulcanization *** cavity of the core-shell structure could provide enough storage space for Na+and alleviate the volume expansion during charge/discharge *** apertures between nanosheets provide a guarantee for the rapid penetration of electrolyte to enhance the utilization rate of electrode ***,building heterostructures by combining different phase structures can facilitate electron transfer and accelerate reaction *** from the synergistic contributions of structure and composition,MoSe_(2./TiO_(2.@N-C as SIBs anode material shows better reversible capacities of 302.5 mAh·g^(-1)at 1 A·g^(-1)for 400 cycles and 2.7.4 mAh·g^(-1)at 4 A·g^(-1)for 900 ***,the reversible capacities can be restored entirely to the initial level after a high current density cycle.

关键词： MoSe_(2./TiO_(2. flower-like hierarchical porous core-shell microspheres heterostructure sodium ion batteries

A Novel,Amorphous,Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and mechanical Properties

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1057-1063页

作者： xigang Yang Yun Zhou Ruihua Zhu Shengqi xi Cheng He Hongjing Wu Yuan Gao state key {2. for mechanical behavior of materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi'an 710049China school of Medical Information and engineering Southwest Medical UniversityLuzhou 646000China

The exceptional corrosion resistance and mechanical properties of high-entropy metallic glasses(HE-MGs)are highly desirable for diverse critical ***,a long-standing problem of these alloys is that their alloy design approaches are based on limited equiatomic or near-equiatomic *** this study,a novel senary alloy(non-equiatomic Fe3 Cr2.Al2.CuNi4 Si5)with amorphous structure was *** alloy exhibited exceptional corrosion resistance and Vickers hardness as high as^1150 Hv at room *** processing route involved amorphous powder molding via a mechanical alloying and ultrahigh pressure consolidation technique,resulting in an optimal microstructure of amorphous structure with nanoparticles uniformly distributed in the matrix *** approach can effectively inhibit the crystallization of amorphous structure,thus providing a general pathway for manufacturing next-generation non-equiatomic HE-MGs with both exceptional corrosion resistance and strength.

关键词： Alloying Metallic glasses Corrosion resistance mechanical alloying High-entropy metallic glasses

Formation of Fe-19 wt%Cr-9 wt%Ni Nanocrystalline Alloy with Excellent Corrosion Resistance: Phase Transition and Microstructure

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 825-833页

作者： Chongfeng Sun Shengqi xi xiaofeng Dang Jianping Li Yongchun Guo Zhong Yang Yaping Bai school of materials and Chemical {2. Xi'an Technological UniversityXi'an 710021China state key {2. for mechanical behavior of materials Xi’an Jiaotong UniversityXi’an 710049China

In this paper,microstructure characteristics and phase transitions of Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy are comprehensively studied during the mechanical alloying and hot pressing sintering *** resistance of the sintered Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy samples is further *** the mechanical alloying process,Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy powders mainly composed of metastable ferrite phase are obtained after mechanical alloying for 8,16 and 2. h,*** the subsequent hot pressing sintering process,the phase transitions(from ferrite to austenite)occur from 650 to 750°C for Fe-19 wt%Cr-9 wt%Ni alloy powders milled for 2. *** the sintering temperature is raised to 1050°C for 1 h,the ferrite phase has transformed into austenite phase completely,and the obtained grain size of sintered Fe-19 wt%Cr-9 wt%Ni alloy is around 40 *** test of the sintered Fe-19 wt%Cr-9 wt%Ni alloy has been operated in 0.5 mol L^(-1) H_(2.SO_(4) solution to show the corrosion resistance *** show that the sintered Fe-19 wt%Cr-9 wt%Ni alloy exhibits excellent corrosion resistance,which is proved by higher self-corrosion potential,lower self-corrosion current density and larger capacitive reactance,compared with that of commercial 304 stainless steel.

关键词： mechanical alloying Hot pressing sintering Nanocrystalline alloy Phase transition Corrosion resistance

CAF/PA12.合材料成形件低速冲击性能研究

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聚酯工业 2024年第4期37卷 8-11页

作者：雍墨轩杜兵姜稀膑北京机科国创轻量化科学研究院有限公司北京100083 机械科学研究总院集团有限公司先进成形技术与装备全国重点实验室北京100044 机械科学研究总院北京100044

使用不同纤维含量复合丝材制备的成形件的力学性能有一定差异。为提高连续芳纶纤维增强尼龙12.CAF/PA12.复合材料成形件的低速冲击性能,探究了冲击能量和复合丝材纤维含量对成形件低速冲击性能的影响。对较低纤维含量复合丝材制备的成形... 详细信息

使用不同纤维含量复合丝材制备的成形件的力学性能有一定差异。为提高连续芳纶纤维增强尼龙12.CAF/PA12.复合材料成形件的低速冲击性能,探究了冲击能量和复合丝材纤维含量对成形件低速冲击性能的影响。对较低纤维含量复合丝材制备的成形件,采用单因素实验,探究了不同冲击能量下的抗冲击性能。并分析了四种纤维含量复合丝材制备的复合材料成形件的低速冲击性能。实验结果表明,36.14%纤维含量复合丝材制备的成形件具备较好的低速冲击性能。

关键词：纤维含量连续纤维复合材料抗冲击性能