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Brazing temperature-dependent interfacial reaction layer features between CBN and Cu-Sn-Ti active filler metal

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Journal of Materials Science & Technology 2019年第10期35卷 2163-2168页

作者： Yonggang Fan Junxiang Fan cong Wang School of Metallurgy Northeastern UniversityShenyang110819China shenyang NEU New Industrial Technology Research Institute co.ltd Northeastern UniversityShenyang110819China

CBN/Cu-Sn-Ti(CBN: cubic boron nitride) composites are prepared by active brazing sintering at 1123 K,1173 K, 1223 K and 1273 K, respectively. The effects of brazing temperature on the wettability, interfacial characteristics, and elemental distribution variations are fully investigated. When the brazing temperature is below 1223 K, completely uncoated and/or partially coated CBN particles with sharp edges can still be observed, and the reaction layer, mainly composed of Ti N and Ti B2, appears to be thin and *** the brazing temperature is 1223 K, all CBN particles are completely coated, suggesting that adequate wetting has taken place. Besides, as Ti diffuses thoroughly and enriches the interface, the reaction layer, filled primarily by Ti N, Ti B2 and Ti B, becomes thicker(about 1.30 μm), more uniform, stable and continuous. Further increasing the temperature to 1273 K is unnecessary or even harmful as the reaction layer thickness undergoes negligible change yet some tiny micro-cracks appear on the interface, which may likely deteriorate the grinding capability of the final brazing products.

关键词： Brazing temperature CBN/Cu-Sn-Ti filler metal Wettability Reaction layer

Laser cladding of NiCrSiB on Monel 400 to enhance cavitation erosion and corrosion resistance

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Rare Metals 2022年第12期41卷 4257-4265页

作者： Chun-Hua Zhang Chen-Liang Wu Song Zhang Yong-Feng Jia Meng Guan Jun-Zhe Tan Bin Lin School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Nuclear Power Pump Industry co. Ltd.Shenyang Blower Works Group CorporationShenyang 110869China

NiCrSiB modified layer was synthesized on Monel 400 by laser cladding,aiming at improving cavitation erosion and corrosion *** microstructure,chemical composition,phase constituents and microhardness were investigated using scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),X-ray diffractometry(XRD) and microhardness *** cavitation erosion and corrosion behaviors of the modified layer were also evaluated using an ultrasonic vibrator and potentiodynamic polarization measurement,*** results show that by varying the laser fluence,a hard NiCrSiB modified layer with little airholes,cracks or other defects could be *** modified layer is ~1.1 mm in *** microstructure of the modified layer exhibits cellular dendrite,flake-like dendrite and multiple eutectic *** modified layer is mainly composed of γ-Ni solid solution,chromium carbide(Cr_(7)C_(3)and Cr_(23)C_(6)) and Ni_(3)*** microhardness of the modified layer is ~6.8 times that of Monel 400 *** the cavitation erosion and corrosion resistance of the modified layer are *** the cavitation erosion test,the cumulative erosion loss and erosion loss rate of the modified layer are one order of magnitude lower than that of the *** the electrochemical corrosion test,the corrosion potentials of the substrate and the modified layer are *** corrosion current densities of the substrate and the modified layer are 11.12 and 1.95 μA·cm^(-2),*** comparing their corrosion current densities,the corrosion resistance of the modified layer is about 5.7 times that of the substrate.

关键词： NiCrSiB Laser cladding Microstructure Cavitation erosion corrosion

Properties of alumina-based ceramic cores

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China Foundry 2021年第6期18卷 593-598页

作者： Xiao-fu Liu Xin-li Guo Guo-yan Shui Chang-chun Li Gui-qiao Su Xun Sun Yang Guan Lei Jin shenyang Research Institute of Foundry co. Ltd.Shenyang 110022China

Fused corundum is a rather promising raw material for preparing an alumina-based ceramic core due to its excellent high temperature resistance and chemical *** this study,alumina-based ceramic cores were prepared using fused corundum as the matrix material,and the effect of varying silica powder contents on the properties of the alumina-based ceramic cores,including the sintering shrinkage,the flexural strength,and the high temperature deformation was *** mineralization mechanisms of the silica on the alumina-based ceramic core were also *** optimum addition amount of silica in this experiment is 8% in *** that moment,the aluminum-based core has both a low sintering shrinkage coefficient of 0.66% and better properties:the room temperature flexural strength is 22.19 MPa,the high temperature flexural strength is 21.54 MPa,the high temperature deformation is 0.93 mm,and the residual flexural strength is 47.41 MPa.

关键词： fused corundum ceramic core mineralization mechanism silica powder

Improving the mechanical property of dissimilar Al/Mg hybrid friction stir welding joint by PIO-ANN

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Journal of Materials Science & Technology 2020年第18期52卷 41-52页

作者： Wei Hu Zhongwei Ma Shude Ji Qi Song Mingfei Chen Wenhui Jiang college of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China Engineering Research Center of Industrial-grade Multi-rotor UAV of Liaoning Province Shenyang 110136China SLZY(shenyang)High-tech co LtdShenyang 1101172China

Ultrasonic-stationary shoulder assisted friction stir welding(U-SSFSW)is a novel hybrid welding technique,which reveals promising prospect in joining Al/Mg dissimilar alloys.A thorough understanding of U-SSFSW process is imperative for the further application of this ***-inspired optimization(PIO)is a swarm intelligent optimization algorithm and is proposed in mathematical modeling and process optimization by artificial *** this study,PIO optimized artificial neural network(PIOANN)was firstly established to acquire the relationships between the inputs and output of the Al/Mg welding process by U-SSFSW technique.A reliable PIO-ANN was achieved and the joint with a tensile strength of 161 MPa was acquired under the PIO optimized *** tensile strength is higher than any ever-reported results with the similar welding *** joint formation,microstructure,microhardness and fracture behaviors were systemically investigated based on the reported studies and the confirmation experiment of this study to explore the enhancing mechanism of U-SSFSW Al/Mg joint.

关键词： Hybrid friction stir welding Al/Mg dissimilar alloys Artificial neural network Pigeon-inspired optimization Ultrasonic

Study on High Rate Discharge Performance and Mechanism of AB_5 Type Hydrogen Storage Alloys

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Journal of Rare Earths 2004年第4期22卷 509-513页

作者：郭靖洪陈德敏于军张建海刘国忠杨柯 Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China Suppo Battery Co. Ltd. Shenyang 110015 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China Suppo Battery co. Ltd. Shenyang 110015 China

The effects of surface treatment, particle size distribution,rare earth composition and B additive on the high rate discharge performance of hydrogen storage alloys were investigated. It is found that the activity, discharge capacity and high rate dischargeability of the alloys are improved after physical and chemical modification as a result of the increase of the surface area and formation of the electrocatalysis layers, which increase both the electrochemical reaction rate on the alloy surface and H diffusion rate in the alloy bulk. It is also found that both the over-coarse and over-fine particle size increase the contact resistance of the electrode, resulting in a decrease of discharge capacity, deterioration of high rate dischargeability and lower discharge plateau. In another word, a suitable particle size distribution can enhance the alloy activity, discharge capacity and high rate dischargeability. In addition, the high rate dischargeability is enhanced by increasing La content and decreasing Ce content of the alloy composition because of enlargement of the unit cell volume and the improvement of the surface activity. Moreover, B additive resultes in the formation of the second phase, and makes the alloys easier pulverization, which greatly improves the activity, discharge capacity and high rate dischargeability.

关键词： storage energy technology hydrogen storage alloy discharge capacity activity high rate dischargeability rare earths

Tribology Performance and Adhesive Strength Evaluation of TiAlSiN coating

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Transactions of Tianjin University 2011年第4期17卷 248-253页

作者：姜峰谢鸿融亦鸣言兰 State Key Laboratory of Tribology Department of Precision Instruments and Mechanology Tsinghua University machine tool Factory Dongfang Turbine Co Ltd college of Materials Science and Engineering Sichuan University

Scratch test and friction test were performed to evaluate the internal and external interface behaviors of TiAISiN coating, respectively. The critical compressive and shearing stress of coating failure during scratch test were calculated and the values are 30.84 MPa and 4.98 MPa respectively. The average friction coefficients of TiAISiN coat- ing against 2Crl2Ni4Mo3VNbN steel are 0.70 （sliding speed 50 m/rain）, 0.63 （sliding speed 100 m/min）, and 0.81 （sliding speed 150 m/min）. The elements diffusion was analyzed by EDS. A1 and Si element of coating material dif- fuse to the steel disc, except Ti element. The oxidation decreases with the increase of sliding speed, but the adhesion increases with the increase of sliding speed. More A1 element diffuses to the steel disc at the high sliding speed, but the diffusion of Si element keeps almost constant at dlfferent sliding speeds.

关键词： TiAISiN coating internal and external interface scratch test ball-on-disc friction test

Dissolution behavior of Al_(2)O_(3)inclusions into CaO-MgO-SiO_(2)-Al_(2)O_(3)-TiO_(2)system ladle slags

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 977-987页

作者： Zhiyin Deng Xiaomeng Zhang Guangyu Hao Chunxin Wei Miaoyong Zhu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China TBEA shenyang Transformer Group co. Ltd.Shenyang 110141China Angang Steel co. Ltd.Anshan 114021China

To investigate the dissolution behaviors of Al_(2)O_(3)inclusions in CaO-5wt%MgO-SiO_(2)-30wt%Al_(2)O_(3)-TiO_(2)system ladle slags,confocal scanning laser microscopy was conducted on the slags with different TiO_(2)contents(0-10wt%),and scanning electron microscopy was performed to study the interfacial reaction between Al_(2)O_(3)and this slag *** results disclose that the dissolution of Al_(2)O_(3)inclusions does not result in the formation of new phases at the boundary between the slag and the *** TiO_(2)-bearing and TiO_(2)-free ladle slags,there is no difference in the dissolution mechanism of Al_(2)O_(3)inclusions at steelmaking *** layer diffusion is found as the controlling step of the dissolution of Al_(2)O_(3),and the diffusion coefficient is in the range of 4.18×10^(-10)to 2.18×10^(-9)m^(2)/s at 1450-1500℃.compared with the solubility of Al_(2)O_(3)in the slags,slag viscosity and temperature play a more profound role in the dissolution of Al_(2)O_(3)inclusions.A lower viscosity and a lower melting point of the slags are beneficial for the *** addition of TiO_(2)(e.g.,5wt%)in ladle slags can enhance the dissolution of Al_(2)O_(3)inclusions because of the low viscosity and melting point of the slags,while excessive addition of TiO_(2)(e.g.,10wt%)shows the opposite trend.

关键词： inclusions dissolution ladle refining slag titanium dioxide confocal scanning laser microscopy

Role of processing parameters on relative density,microstructure and mechanical properties of selective laser melted titanium alloy

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China Foundry 2024年第6期21卷 676-684页

作者： Tian-yu Liu Bo-liang Liu Jiao-jiao Cheng Shi-bing Liu Kun Shi Hong-yu Liu Jun Zhao National Key Laboratory of Advanced Casting Technologies Shenyang Research Institute of Foundry Co.Ltd.CAMShenyang 110022China

The relationships between the selective laser melting(SLM)processing parameters including laser power,scanning speed and hatch space,the relative density,the microstructure,and resulting mechanical properties of Ti-6Al-2Zr-1Mo-1V alloy were investigated in this *** result shows that laser power acts a dominant role in determining the relative density in comparison with scanning speed and hatch *** optimal SLM process window for fabricating relative density>99%samples is located in the energy density range of 34.72 J·mm^(-3)to 52.08 J·mm^(-3),where the laser power range is between 125 W and 175 *** upward trend is found in the micro-hardness as the energy density is *** optimum SLM processing parameters of Ti-6Al-2Zr-1Mo-1V alloy are:laser power of 150 W,scanning speed of 1,600 mm·s^(-1),hatch space of 0.08 mm,and layer thickness of 0.03 *** highest ultimate tensile strength,yield strength,and ductility under the optimum processing parameter are achieved,which are 1,205 MPa,1,099 MPa,and 8%,*** results of this study can be used to guide SLM production Ti-6Al-2Zr-1Mo-1V alloy parts.

关键词： selective laser melting processing parameter Ti-6Al-2Zr-1Mo-1V titanium alloy relative density microstructure mechanical properties

Preparation and characterization of Ca-P coating on AZ31 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2010年第B7期20卷 648-654页

作者：谭丽丽王强耿芳席小松邱剑红杨柯 Institute of Metal Research Chinese Academy of Sciences(Shenyang) School of Stomatology China Medical University(Shenyang) Trauson Medical Instrument co Ltd

A Ca-P coating consisting of biodegradableβ-tricalcium phosphate[β-TCP,β-Ca3(PO4)2]accepted for medical application was coated on a biodegradable AZ31 alloy by chemical deposition to improve the corrosion *** good bonding strength of the coating is *** results show that the corrosion potential of the Ca-P coated AZ31 alloy increases significantly,and MG63 cells show good adherence,proliferation and differentiation on the surface of the coated *** Ca-P coating might be an effective way to improve the surface bioactivity of magnesium alloys.

关键词： biodegradable magnesium alloy β-TCP chemical deposition biocompatibility