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Stress-assisted corrosion mechanism of 3Ni steel by using gradient boosting decision tree machining learning method

International Journal of Minerals,Metallurgy and materials 2024年第6期31卷 1311-1321页

作者： Xiaojia Yang Jinghuan Jia Qing Li Renzheng Zhu Jike Yang Zhiyong Liu Xuequn Cheng Xiaogang Li institute of Advanced materials and Technology University of Science and Technology BeijingBeijing 100083China aecc Key Laboratory of Advanced Corrosion and Protection of aeronautical materials AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China

Traditional 3Ni weathering steel cannot completely meet the requirements for offshore engineering development,resulting in the design of novel 3Ni steel with the addition of microalloy elements such as Mn or Nb for strength enhancement becoming a *** stress-assisted corrosion behavior of a novel designed high-strength 3Ni steel was investigated in the current study using the corrosion big data *** information on the corrosion process was recorded using the galvanic corrosion current monitoring *** gradi-ent boosting decision tree(GBDT)machine learning method was used to mine the corrosion mechanism,and the importance of the struc-ture factor was *** exposure tests were conducted to verify the calculated results using the GBDT *** indic-ated that the GBDT method can be effectively used to study the influence of structural factors on the corrosion process of 3Ni ***-ferent mechanisms for the addition of Mn and Cu to the stress-assisted corrosion of 3Ni steel suggested that Mn and Cu have no obvious effect on the corrosion rate of non-stressed 3Ni steel during the early stage of *** the corrosion reached a stable state,the in-crease in Mn element content increased the corrosion rate of 3Ni steel,while Cu reduced this *** the presence of stress,the increase in Mn element content and Cu addition can inhibit the corrosion *** corrosion law of outdoor-exposed 3Ni steel is consistent with the law based on corrosion big data technology,verifying the reliability of the big data evaluation method and data prediction model selection.

关键词： weathering steel stress-assisted corrosion gradient boosting decision tree machining learning

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Structure characterization of the oxide film on FGH96 superalloy powders with various oxidation degrees

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International Journal of Minerals,Metallurgy and materials 2024年第9期31卷 2037-2047页

作者： Yang Liu Yufeng Liu Sha Zhang Lin Zhang Peng Zhang Shaorong Zhang Na Liu Zhou Li Xuanhui Qu beijing Advanced Innovation Center for materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China institute of materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Science and Technology on Advanced High Temperature Structural materials Laboratory AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China

The structure of the oxide film on FGH96 alloy powders significantly influences the mechanical properties of *** this study,FGH96 alloy powders with various oxygen contents were investigated using high-resolution transmission electron microscopy and atomic probe technology to elucidate the structure evolution of the oxide *** dispersive spectrometer analysis revealed the presence of two distinct components in the oxide film of the alloy powders:amorphous oxide layer covering the γ matrix and amorphous oxide particles above the *** alloying elements within the oxide layer showed a laminated distribution,with Ni,Co,Cr,and Al/Ti,which was attributed to the decreasing oxygen equilibrium pressure as oxygen diffused from the surface into the γ *** the other hand,Ti enrichment was observed in the oxide particles caused by the oxidation and decomposition of the carbide *** analysis of the oxide film with oxygen contents of 140,280,and 340 ppm showed similar element distributions,while the thickness of the oxide film varies approximately at 9,14,and 30 nm,*** findings provide valuable insights into the structural analysis of the oxide film on FGH96 alloy powders.

关键词： Ni-based superalloys surface structure oxide layer thickness oxidation behavior element distribution

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Optimizing design of lattice materials based on finite element simulation

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China Welding 2024年

作者：孙兵兵陈冰清刘伟秦仁耀张学军 aecc beijing institute of aeronautical materials School of materials Science and Engineering Shanghai Jiao Tong University

The optimized design of simple cross-truss and column lattice structures was carried out by the SolidWorks simulation *** effective density of the structure was calculated according to the weight reduction requirements proposed by the project. Then, the variation curve between the maximum bearing stress of the unit structure and the structural variables was obtained by simulation. Meanwhile, the mathematical equation between the maximum bearing stress and the structural variables could be obtained through MATLAB fitting. The results indicated that with the decrease in the number of cells, the compressive strength of the prepared column lattice increased(400 to 4cells, compressive strength 29 MPa to 160 MPa). However, the yield strength increased with the number of cells. The compression strength of the simple cross-truss lattice samples indicated an increase trend with the decrease of the pillar size(an increase of the number of units),reaching 91 MPa(pillar diameter 0.52 mm, number of units 25). While the yield strength increased with the increasing of the number of units. In addition, the additive manufacturing processes of simple cubic lattice and simple cross-pillar lattice were investigated using selective laser melting. The compression performance obtained from the experiment is compared with the simulation results, which are in good agreement. The results of this paper can provide an important reference for optimizing design of lattice materials.

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Hollow FeCoNiAl microspheres with stabilized magnetic properties for microwave absorption

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Nano Research 2024年第3期17卷 2079-2087页

作者： Linhe Yu Gangjie Lian Guozhen Zhu Sue Ren Yanfang Du Xuhui Xiong Rui Chen Jincang Zhang Wenbin You Renchao Che institute of Advanced materials College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China Laboratory of Advanced materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438China Zhejiang Laboratory Hangzhou 311100China Capital Aerospace Machinery Corporation Limited Beijing 100000China aecc beijing institute of aeronautical materials Beijing 100095China International Center for Quantum and Molecular Structures Materials Genome InstitutePhysics DepartmentShanghai UniversityShanghai 200444China

Development of high-performance microwave absorption materials(MAM)with stabilized magnetic properties at high temperatures is specifically essential but remains ***,the Snoke's limitation restrains the microwave absorption(MA)property of magnetic *** alloy components is considered an effective way to solve the aforementioned ***,a hollow medium-entropy FeCoNiAl alloy with a stable magnetic property is prepared via simple spray-drying and two-step annealing for efficient *** exhibited an ultrabroad effective absorption band(EAB)of 5.84 GHz(12.16–18 GHz)at a thickness of just 1.6 mm,revealing an excellent absorption ***,the MA mechanism of FeCoNiAl is comprehensively investigated via off-axis ***,the electromagnetic properties,antioxidant properties,and residual magnetism at high temperatures of FeCoNiAl alloys are summarized in detail,providing new insights into the preparation of MAM operating at elevated temperatures.

关键词： microwave absorption hollow structure magnetic stability multiple microwave absorption mechanism

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Hygrothermal and temperature effects on load-carrying capacity and failure mechanism of open-hole laminates prepared with narrow tape prepreg of GFRP

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Progress in Natural Science:materials International 2022年第3期32卷 392-399页

作者： Yana Wang Xiang Wang Wei Zhao Yuhuai He aeronautical material Testing Research Center AECC Beijing Institute of Aeronautical Materials beijing Key Laboratory of aeronautical material Testing and Evaluation Key Laboratory of aeronautical material Testing and Evaluation Aero Engine Corporation of China School of Astronautics Beihang University

The tensile and compressive properties of the open-hole laminates fabricated with glass fiber reinforced polymer(GFRP) under various temperature/humidity coupled conditions are important design parameters for GFRP structures in helicopter. In current work, a comprehensive experimental study about the effects of temperature and hygrothermal on the open-hole mechanical property of HS6/AC318 glass/epoxy multidirectional laminates was conducted. The load-displacement responses, fracture morphologies and failure mechanisms of quasiisotropic GFRP laminates with a center hole under tensile and compressive loads at the five environmental conditions were compared, and the effects of the temperature and hygrothermal on the open-hole tensile(OHL)strengths and open-hole compressive(OHC) strengths of GFRP laminates were investigated. In addition, the relevancies between the OHL and OHC strength of open-hole laminates and the basic material properties of unidirectional laminates were explored, and some links between the OHL strength and interlaminar fracture toughness were found. The results showed that the OHC strength of open-hole laminates was directly proportional to the 0° compressive strength of unidirectional laminates. Based on the experimental data and analysis an empirical formula of the OHC strength at arbitrary temperature and humidity combined conditions was proposed.

关键词： GFRP Open-hole compression Open-hole tension Hygrothermal effect Experiments

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Burning products of TA15 titanium alloy by friction oxygen concentration method

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Rare Metals 2018年第11期37卷 952-960页

作者： Nan Sui Guang-Bao Mi Meng-Qi Yan Jing-Xia Cao Xu Huang Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials

The microstructural characteristics, elemental distribution law and microscopic formation mechanism of the burning products of TA15 titanium alloy were investigated by friction oxygen concentration method, associated with in situ observation, X-ray diffraction(XRD),scanning electron microscopy(SEM) and energy-dispersive spectroscopy(EDS) analyses, providing the thoughts to improve fireproof property. The results show that, when the friction contact pressure(p) is 0.20 MPa and oxygen concentration of premixed air flow(c) is 60 vol%, TA15 titanium alloy produces violent sparks and presents dazzling white light during combustion. The generated products after burning are mainly TiOand small amount of AlOoxides. Four distinct zones form from the combustion surface to the alloy matrix, and they are in the sequence of combustion zone, fusion zone, heat-affected zone and transition zone. Further, combustion zone is composed of TiOand A1203 compounds, containing obvious cracks. In the fusion zone, discontinuous oxygenrich Al-based solid solution forms, and the elemental distribution has strong volatility. In the heat-affected zone,there are abundant of Ti-based solid solution and small amount of Al-and Mo-based solid solution. Transition zone is made of lamellar structure. Two technical approaches are given to prevent oxygen diffusion inside the reaction zone and reaction-affected zone. On the one hand,the content of Al is designed as the upper limit of alloy composition; on the other hand, fireproof coatings are deposited on the surface of the alloy.

关键词： Friction oxygen concentration method TA15 titanium alloy Burning products Microstructure Titanium fire

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Prediction of low-cycle crack initiation life of powder superalloy FGH96 with inclusions based on damage mechanics

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 895-907页

作者： Yuan-ming XU Shu-ming ZHANG Tian-peng HE Xin-ling LIU Xia-yuan CHANG School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China aecc beijing institute of aeronautical materials Beijing 100095China

The effects of inclusions in powder superalloy FGH96 on low-cycle fatigue life were studied, and a low-cycle crack initiation life prediction model based on the theory of damage mechanics was proposed. The damage characterization parameter was proposed after the construction of damage evolution equations. Fatigue tests of the powder superalloy specimens with and without inclusion were conducted at 530 and 600 ℃, and the model verification was carried out for specimens with elliptical, semi-elliptical, polygon and strip-shaped surface/subsurface inclusion. The stress analysis was performed by finite element simulation and the predicted life was calculated. The results showed a satisfying agreement between predicted and experimental life.

关键词： powder superalloy FGH96 low-cycle fatigue inclusion crack initiation life prediction damage mechanics

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Testing and evaluation for fatigue crack propagation of Ti-6Al-4V/ELI and 7050-T7452 alloys at high temperatures

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Chinese Journal of Aeronautics 2018年第6期31卷 1388-1398页

作者： Yuntao ZHU Junjiang XIONG Zhiyang LV Yanguang ZHAO School of Transportation Science and Engineering Beihang University Beijing 100083 China aecc beijing institute of aeronautical materials Beijing 100095 China

This paper seeks to evaluate crack propagation properties and residual lives of metallic alloys subjected to fatigue loading at room and high temperatures. Fatigue crack growth tests were performed on Ti-6Al-4V/ELI and 7050-T7452 subjected to constant-amplitude and actual randomspectra loading at room temperature of about 25 ℃ and at high temperatures of 250 ℃ and 150 ℃ to determine their crack growth properties and residual lives. The damage mode and mechanisms at high temperature were compared with those at room temperature on the basis of the results of fractographic analysis. Temperature-dependent residual lives under actual random-spectra load history were evaluated based on a modified accumulation damage rule accounting for the load *** correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.

关键词： Crack growth Fatigue High temperature Metallic alloy Residual fife

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Microstructure inheritance of matrixes of SiC_(f)/Ti6242 composites from precursor wire coatings byα+βphase field consolidation

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Rare Metals 2021年第12期40卷 3676-3684页

作者： Wang-Teng-Fei Fang Xu Huang Hu Li Min-Juan Wan Mao Wen Hao Huang aecc beijing institute of aeronautical materials Beijing 100095China College of materials Science and Engineering Jilin UniversityChangchun 130012China

SiC_(f)/Ti composite owns the attractive advantages of lightweight and excellent high-temperature performance,which make it have great significance to the development of aerospace ***,the complicated fabrication route and novel architecture of SiC_(f)/Ti composite bring about more difficulties for controlling its *** this work,the method of regulating the structure and performance of the composite matrix by adjusting the characteristics of the precursor wire was *** physical vapor deposition(PVD)method was applied to fabricate precursor ***6242 coatings with bamboo leaf-shaped grains and chrysanthemumshaped grains were deposited on SiC fibers by changing the PVD *** is found that the original structure of the Ti6242 coating of precursor wire has significant impact on the microstructure of the composite matrix after hot isostatic pressing(HIP).The matrix transformed from the Ti6242 coating with bamboo leaf-shaped grains exhibits equiaxed grain *** the other matrix has a columnar crystal structure,and the inside of the columnar crystal inherits the original chrysanthemum-shaped *** columnar crystal matrix has lower hardness and modulus than the equiaxed grain matrix.

关键词： SiC_(f)/Ti composite physical vapor deposition(PVD) Ti6242 coating HIP consolidation Matrix

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Mechanical and tribological properties of graphene nanoplatelets-reinforced titanium composites fabricated by powder metallurgy

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Journal of Iron and Steel Research International 2020年第11期27卷 1357-1362页

作者： Zhen Cao Jiong-li Li Hai-ping Zhang Wen-bo Li Xu-dong Wang aecc beijing institute of aeronautical materials Beijing 100095China beijing institute of Graphene Technology Beijing 100094China beijing Engineering Research Centre of Graphene Application Beijing 100095China

Titanium matrix composite reinforced by graphene nanoplatelets(GNPs)was fabricated via powder metallurgy *** isostatic pressing and hot extrusion were used to consolidate the mixed powder of GNPs and TC4 titanium(Ti)*** microstructures,mechanical properties and sliding wear performance of Ti/GNPs composite had been researched to evaluate the rein forcing effect of GNPs on tita nium *** observation indicates that GNPs could restrain grai n growth slightly in titanium *** matrix and graphene exhibit a clean and firm interface formed by means of metallurgical bonding on atomic *** with the monolithic titanium alloy,the composite with 1.2 vol.%GNPs exhibits significantly improved elastic modulus and *** sliding wear test shows that there is an obvious enhancement in the tribological performance of Ti/GNPs composite with 1.2 vol.%*** results of this work indicate that GNP is an efficient reinforcenient material in titanium *** strengthening mechanism including precipitates strengthening,load transfer and grain refinement mechanism of GNPs in titanium matrix was discussed.A modified shear-lag model was used to analyze the reinforcement contribution of the stress transfer *** calculation shows that the stress load mechanism constitutes the main strengthening mechanism in Ti/GNPs composite.

关键词： Titanium matrix composite Graphene Mechanical testing Tribological property Powder metallurgy

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