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Journal of Materials Science & Technology 2023年第10期141卷 257-268页

作者： Wenyao Sun minghui chen Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China

Nanocrystalline coating with the same chemical composition as the nickel-based superalloys was proved to possess high resistance to oxidation and scale spallation,meanwhile avoid notable elements *** opens up a new direction for the development of protective ***,in a worse environment containing chlorine and water vapor,the ultrafine grains act like a double-edged sword,which can promote the formation of a protective scale of Al_(2)O_(3)or Cr_(2)O_(3),but also favor the inward dif-fusion of Cl and H_(2)O to accelerate *** order to solve this problem,moderate amount of oxygen was doped into nanocrystalline coating during magnetron ***,corrosion behavior of the two nanocrystalline coatings with or without oxygen doping was studied in the O_(2)+38%H_(2)O environment with solid NaCl *** indicated that the doped oxygen can attract active elements of Ti and Al to form TiO_(2)andθ-Al_(2)O_(3),which pinned at grain boundaries to keep the ultrafine grains stable at high temperature while prevent inward diffusion of the corrosive ***,a dense and pure chromia scale was formed quickly at surface,ensuring that the oxygen-doped nanocrystalline coating provided the highest corrosion resistance under the synergy of solid NaCl deposit and water *** contrast,the coating without oxygen doping suffered from severe internal corrosion.

关键词： High-temperature corrosion Nickel-based superalloys Coatings Chlorination Water vapor

Ni/AlN Composite Coating for Corrosion and Elements Interdiffusion Resistance in Molten Fluoride Salts System

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Acta Metallurgica Sinica(English Letters) 2021年第12期34卷 1704-1714页

作者： chengxu Wang Wei chen minghui chen Demin chen Fuhui Wang School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China

The Ni/AlN composite coating was prepared for increasing corrosion and elements interdiffusion resistance of GH3535 alloy in molten fluoride salts,and the effect of mechanical interlocking on adhesion strength between AlN layer and nickel coating was also *** indicated that the adhesion strength between AlN layer and nickel coating could be significantly enhanced through mechanical interlocking effect,which effectively prevented the nickel coating from flaking off at elevated *** an etching pre-treatment of AlN layer,the corrosion resistance of the Ni/AlN coated GH3535 alloy in molten FLiNaK salt was further improved,and elements interdiffusion between the substrate and nickel coating was completely *** layer as a diffusion barrier remained compact and continuous in Ni/GH3535 system after high-temperature molten salt ***,a Ni-P layer consisting of Ni3P and Ni phases formed in the Ni coating after corrosion.

关键词： Molten salt Superalloy Composite coating High temperature corrosion

Effect of TiN diffusion barrier on elements interdiffusion behavior of Ni/GH3535 system in LiF-NaF-KF molten salt at 700℃

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Journal of Materials Science & Technology 2020年第10期42卷 125-132页

作者： chengxu Wang Wei chen minghui chen Demin chen Ke Yang Fuhui Wang Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China

A TiN interlayer with high electrical conductivity was prepared between the GH3535 alloy and the Ni coating as a diffusion barrier to elements interdiffusion with the goal of increasing the corrosion resistance of GH3535 alloy in molten FLiNaK salt at 700℃.Results indicated that Ni coating could be directly electroplated on the TiN coated GH3535 alloy without extra conductive transition *** layer showed excellent thermal and chemical stabilities at elevated temperature in this molten salt system,without phase *** Ni/TiN composite coating was stable enough to resist corrosion in LiF-NaF-KF molten salt at 700℃.Elements interdiffusion between the substrate and Ni coating could be effectively inhibited and the corrosion resistance of the alloy was greatly ***,the TiN interlayer remained continuous and well adhered to the Ni coating as well as the substrate after corrosion test.

关键词： Molten salts Superalloys Composite coating High temperature corrosion

High-entropy FeNiCoCr alloys with improved mechanical and tribological properties by tailoring composition and controlling oxidation

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Journal of Materials Science & Technology 2021年第23期82卷 207-213页

作者： Jie Xu Xuan Kong minghui chen Qunchang Wang Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China

Many metal matrix self-lubricating composites possess excellent comprehensive properties of high strength and wear resistance after incorporating various lubricants that usually belong to ceramic ***,this improvement is always obtained at the cost of notable decrease in *** order to break through this toughness-tribological properties trade-off,self-lubricating composite alloys based on the matrix of Fe NiCoCr_(0.5) high entropy alloy(HEA)were prepared by milling addition of element Co or Cr and then spark plasma sintering(SPS).Co or Cr is added into the base HEA with the aim of tailoring oxidation behavior,mechanical properties as well as tribological *** no ceramic lubricants are used,the alloy composites remain high *** or Cr element addition leads to the precipitation of a hard phase of a-Cr and grain refinement,both of which contribute to the increase of mechanical *** sliding,oxidation of Fe and Ni is ***,the oxides of cobalt and chromium are formed upon the Co-and Cr-modified HEAs,*** oxidation products,especially the oxides of cobalt that are easy to be sintered on sliding,are in favor of the formation of a lubricating glaze layer at 400℃on the worn surface,and thus the decrease in friction coefficient and wear rate,which are 0.33 and 4.0×10^(-5) mm^(3)/(N m),respectively.

关键词： High entropy alloys Oxidation behavior Self-lubricating composite Cobalt oxide

A general strategy towards improving the strength and thermal shock resistance of glass-ceramics through microstructure regulation

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Journal of Materials Science & Technology 2022年第25期120卷 139-149页

作者： Min Feng chengyang Jiang minghui chen Shenglong Zhu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Chinese Academy of Sciences Institute of Metal ResearchShenyang 110016China

Glass-ceramics are usually obtained through controlled *** this work,we propose a new strategy to add an appropriate amount of oxide particles to the parent glass to improve the performance of *** amounts of Al_(2)O_(3) or/and CeO_(2) particles were added into a SiO_(2)-Al_(2)O_(3)-ZnOCaO-ZrO_(2)-TiO_(2)based glass,and crystallization behavior,fracture strength,and thermal shock behavior were systematically *** results indicate that with the addition of Al_(2)O_(3) or/and CeO_(2) particles of moderate amount,the unfavorable needle-like ZrSiO_(4),Zn 2 SiO_(4),and CaTiSiO_(5) crystals were largely inhibited when annealed at 900℃ .Accordingly,fracture strength is maintained high after heating at high *** thermal shock resistance is also enhanced *** additive Al_(2)O_(3) is thermodynamically favorable to react with the glass,forming particulate ZnAl_(2)O_(4) instead of precipitating the needle-like crystals of Zn_(2)SiO_(4) and CaTiSiO_(5);while CeO_(2) will combine with ZrO_(2) to form a solid solution and promote the precipitation of primary crystal CaZrTi_(2)O_(7) that will not transform to ZrSiO_(4) with prolonging thermal exposure.

关键词： Non-metallic glasses(silicates) Crystallization Microstructure Mechanical property High-temperature oxidation

Effect of Interfacial Microstructure on Mechanical and Tribological Properties of Cu/WS_(2) Self-Iubricating Composites Sintered by Spark Plasma Sintering

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Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 913-924页

作者： Zhitao Yu minghui chen Qunchang Wang Xiaolan Wang Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In this study,Cu/WS_(2) self-lubricating composites are fabricated by spark plasma *** microstructure and its effect on mechanical and tribological properties are *** sintering temperature at 850℃promotes decomposition of WS_(2) and its following interfacial reaction with Cu to form Cu_(0.4)W_(0.6) nanoparticles and Cu_(2)S,enhancing mechanical properties as well as wear resistance of the *** the destruction of WS_(2) leads to a high friction *** the contrary,for the composites sintered at 750℃,a nanoscale diffusion zone forms at the Cu/WS_(2) ***_(2) lubricant retains its lamellar *** composite shows excellent self-lubrication performance,with a low friction coefficient of ***,its mechanical properties are low,and the wear rate is one magnitude higher.

关键词： Self-lubricating composites Interfacial microstructure Wear Fracture

High Temperature Oxidation and Tribological Behaviors of NiCrAl-Graphite Self-Lubricating Composites

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Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 900-912页

作者： Xuan Kong Yang Liu minghui chen Tao Zhang Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Nickel-graphite self-lubricating composites are a promising candidate to be used in turbine constructions that are usually exposed to high temperature oxidation and ***,the high-temperature stability of graphite as well as the effect that the oxide scale will play on the following wear process are still yet in *** this work,oxidation behavior of a NiCrAl-graphite composite and the subsequent friction and wear performances were *** indicate that graphite is stable in the composites after oxidation at T≤400℃ for 300 h,which contributes synergistically with the thin oxide film to *** friction coefficient is below 0.20 and the wear rate is~1.43×10^(-5) mm³ N-1 *** composite has the highest friction coefficient and wear rate when it was suffered from the high temperature oxidation at 500℃.Once it was oxidized at 600℃,a glaze layer would develop during the subsequent *** plays a positive role in improving tribological properties though in the absence of lubricant phase of graphite,with to be exactly the friction coefficient and wear rate reduced by 13%and 21%,respectively,in comparison with the case of oxidation at 500℃.

关键词： Oxidation Self-lubricating composites Wear Graphite

Oxidation and Thermal Shock Behavior of a Glass-Alumina Composite Coating on K38G Superalloy at 1000℃

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Journal of Materials Science & Technology 2012年第5期28卷 433-438页

作者： minghui chen Mingli Shen Xin Wang Shenglong Zhu Fuhui Wang State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The glass-alumina composite coatings were successfully prepared on the K38G superalloy *** isothermal oxidation and thermal shock behavior at 1000 ℃ were *** a post-annealing process at 850 ℃,the composite coatings possessed an improved protective effect for the alloy substrates from isothermal oxidation and a higher resistance to thermal *** from the glass matrix and interfacial reaction between the matrix and alumina inclusions,which caused the composites more refractory and tough,accounted for this *** micromechanisms for the formation of oxidation results of spinel ZnCr_2O_4 were also discussed.

关键词： Micromechanics Glass-alumina Nickel based superalloys Oxidation Precipitation

Study on magnetic memory signals of medium carbon steel specimens with surface crack precut during loading process

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Rare Metals 2006年第Z1期25卷 431-435页

作者： DONG Lihong XU Binshi DONG Shiyun YE minghui chen Qunzhi Basic Department Ordnance Engineering College Shijiazhuang 050003 China National Key Laboratory for Remanufacturing of Armored Force Engineering Institute Beijing 100072 China National Key Laboratory for Remanufacturing of Armored Force Engineering Institute Beijing 100072 China National Key Laboratory for Remanufacturing of Armored Force Engineering Institute Beijing 100072 China Basic Department Ordnance Engineering College Shijiazhuang 050003 China Beijing Aeronautical Technology Research Center Beijing 100076 China

Static tensile test and tensile-tensile fatigue test of medium carbon steel sheet specimens with surface crack precut were performed on MTS810 hydraulic testing machine to clear the meaning of the point of Hp(y) value zero. Magnetic memory signals were measured during the test process. The results show that only one point of Hp(y) zero value exists in all measured magnetic signal curves during the loading process, which should be a sign of intersection of positive-negative magnetic poles after magnetic ordered state appears and does not indicate the position of surface crack precut. The analysis shows that the surface crack precut can not interrupt the magnetic ordered state occurred during the test completely, hence its Hp(y) value is not zero. However, the crack extending to a penetrated defect at the instant of specimen′s fracture leads to the discontinuance of magnetic ordered state.

关键词： metal magnetic memory ferromagnetic materials surface crack precut Hp(y) zero value magnetic ordered state

High temperature self-lubricating Ti-Mo-Ag composites with exceptional high mechanical strength and wear resistance

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Journal of Materials Science & Technology 2024年第13期180卷 80-90页

作者： Yu Zhen minghui chen chengtao Yu Zongbang Yang Yang Qi Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China School of Mechanical Engineering Ningxia Institute of Science and TechnologyShizuishan 753000China Lingyun Science&Technology Group Co.Ltd Wuhan 430040China

Titanium alloys are of keen interest as lightweight structural materials for aerospace and automotive ***,a longstanding problem for these materials is their poor tribological ***,we designed and fabricated a multiphase Ti-Mo-Ag composite(TMA)with heterogeneous triple-phase precipitation(TPP)structure by spark plasma sintering.A lamellarα-phase(αL)precipitates from theβ-phase under furnace cooling conditions and maintains a Burgers orientation relationship(BOR)withβ-*** active eutectic transition also occurs in the titanium matrix,resulting in TiAg *** intersecting acicular TiAg and lamellarαL cutβgrains into fine blocks and the primary equiaxedαphase also provides many interfaces withβphase,which together effectively impede dislocation move-ment and increase *** with other titanium composites,TMA with TPP microstructure gets an excellent combination of strength(yield strength 1205 MPa)and toughness(fracture strain 27%).Furthermore,the TPP structure endows TMA with strong cracking resistance,which aids in reducing abra-sive debris at high temperatures during sliding and obtaining a low wear ***,Ag parti-cles distributed at grain boundaries will easily diffuse to the wear surface,in situ forming the necessary lubricating phase Ag_(2)MoO_(4) with Mo-rich matrix debris via *** possesses excellent tribologi-cal properties with especially low wear rate of 8.0 x 10^(-6)mm^(3)N^(-1)m^(-1) and friction coefficient(CoF)of merely 0.20 at 600℃.Unlike other self-lubricating composites with high volume fraction of soft ceramic lubricants,which inevitably sacrifice their mechanical strength and ductility,the composite TMA pos-sesses well-balanced strength,toughness and self-lubricating *** holds important implications to design other metal matrix self-lubricating composites(MMSCs)used for load-bearing moving parts.

关键词： Titanium High-temperature oxidation Self-lubricating Mechanical properties