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Journal of Materials Science & Technology 2006年第6期22卷 860-864页

作者： Cheng LUE Liwen ZHANG Qing＇an TAI Quying ZHENG Zhaokun WANG The State Key Laboratory for Materials Modification by Later Ion and Electron Beams Dalian 116024 China School of Materials Science and engineering Dalian University of Technology Dalian 116024 China shenyang liming aero-engine group corporation Shenyang 110043 China

Thermal, mechanical and microstructural phenomena are involved in the process of steel quenching. Based on the coupled metallo-thermo-mechanics theory, a calculation model has been developed in this study to simulate the quenching process of a gas turbine compressor disk by finite element method. The thermal physical and mechanical properties were treated as a functions of temperature. Moreover, a series of subroutines were developed on the MARC software platform. Consequently, simulated results on temperature, internal stress and distortion during the quenching were illustrated. With the aid of the simulated results, an optimum quenching scheme was proposed. The quenching process simulated in this study appears to be a promising tool in design of heat-treatment processing parameters for gas turbine compressor disks.

关键词： Quenching stress Distortion Finite element method Metallo-thermo-mechanics

Degradation of EB-PVD thermal barrier coatings caused by CMAS deposits

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Progress in Natural Science:Materials International 2012年第5期22卷 461-467页

作者： Hui Peng a,Lu Wang a,b,Lei Guo a,Wenhui Miao a,Hongbo Guo a,Shengkai Gong a a School of Materials Science and engineering,Beihang University,No.37,Xueyuan Road,Beijing 100191,China b AVIC shenyang liming aero-engine group corporation Ltd.,shenyang 110043,China [a] School of Materials Science and engineering Beihang University No.37 Xueyuan Road Beijing 100191 China [b] AVIC shenyang liming aero-engine group corporation Ltd. Shenyang 110043 China

In aero-turbine engines,thermal barrier coatings(TBCs) must be capable to withstand harsh environments,such as high-temperature oxidation and ***,a new failure mode of TBCs caused by calcium-magnesium-alumina-silicate(CMAS) glass has attracted increasing *** this paper,yttria stabilized zirconia(YSZ) TBCs produced by electron beam physical vapor deposition(EB-PVD) were exposed to CMAS deposits at 1250℃.The microstructure evolution and failure mechanism of the coatings were *** has been shown that CMAS glass penetrated into the YSZ ceramic layer along the inter-columnar gaps and interacted with *** a result,an interaction zone of about 20μm thickness,which was the mixture of CMAS and YSZ with equiaxial structure,was formed in the YSZ surface layer after 4h heat-treatment at 1250℃.Meanwhile,yttria in YSZ layer as a stabilizer was dissolved in CMAS glass and caused accelerated monoclinic phase *** 8h heat-treatment,degradation of YSZ TBC occurred by delamination cracking of YSZ layer,which is quite different from the traditional failure caused by interfacial cracking at the YSZ/metallic bond *** models have been built to describe the failure mechanism of EB-PVD TBCs attacked by CMAS deposits.

关键词： Thermal barrier coatings(TBCs) Electron beam-physical vapor deposition(EBPVD) Calcium-magnesium-alumina-silicate(CMAS) Failure mechanism

Research and Application of Automatic Compensation Technology for Grinding Wheel in the Process of Regrinding

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Research and Application of Automatic Compensation Technolog...

Effects of Shot Peening Process on Thermal Cycling Lifetime of TBCs Prepared by EB-PVD

第25届中国控制与决策会议

作者： XIA Xiaojun BAI Song LIU Fei WANG Hongjuan DAI Junlan shenyang Institute of Computing Technology Co. Ltd. Chinese Academy of Sciences Avic shenyang liming aero-engine(group)corporation LTD.

ISBN: (纸本)9781467355339

In this paper, 312DK wriggle grinding machine is used as a platform. First, the paper introduces grinding wheel continuous dressing technology during the process of regrinding. And then, it focuses on how to solve the problems relative to automatic compensation during this process. Finally, by practical application of dressing technology for the grinding wheel, we find it works quite well. Taking the process of complex blade machining as an example, the paper mentions the work flow of machining blade which is guided by automatic compensation technology in the 312DK renovation project. The results of production practice show that surface roughness of the work piece can meet technical index, manmade mistakes are reduced, labor is saved and processing efficiency is improved greatly after using automatic compensation technology.

关键词： Grinding Wheel Continuous Dressing Automatic Compensation 312DK Grinding Machine

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Chinese Journal of aeronautics 2007年第2期20卷 145-147页

作者： ZHOU Zhao-hui GONG Sheng-kai LI He-fei XU Hui-bin ZHANG Chun-gang WANG Lu School of Materials Science and engineering Beij＇ing University of Aeronautics and Astronautics Beij＇ing 100083 China shenyang liming.4ero-engine group corporation Shenyang 110043 China

Conventional two-layered thermal barrier coatings （TBCs） are prepared by electron beam physical vapor deposition （EB-PVD） with ZrO2-8 wt% Y2O3 （8YSZ） as top coat and CoCrAlY as bond coat on disk-shaped Ni based super-alloy. In this paper, three kinds of shot peening process with different lengths of operating time were adopted for bond coating. As a result, changes took place in its surface roughness and the surface micro-hardness. A thermal cycling test at 1 273 Kx55 rain and another at room temperature for 5 min were performed to study the effects of shot peening process on the thermal cycling lifetime of TBCs. It is found that a moderate shot peening process will be able to prolong the life time. The oxidation dynamic of the as-processed TBCs basically accords with the parabolic rule, and the oxidation test also attests to the spallation between YSZ and thermal growth oxide （TGO） responsible mainly for the failure of TBCs.

关键词： thermal cycling lifetime shot peening thermal barrier coatings (TBCs)

A novel method for chemistry tabulation of strained premixed/stratified flames based on principal component analysis

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Applied Mathematics and Mechanics(English Edition) 2018年第6期39卷 855-866页

作者： Peng TANG Hongda ZHANG Taohong YE Zhou YU Zhaoyang XIA Department of Thermal Science and Energy engineering University of Science and Technology of China School of Mechatronics engineering Chizhou University shenyang engine Research Institute Aero Engine(Group) Corporation of China

The principal component analysis （PCA） is used to analyze the high dimen- sional chemistry data of laminar premixed/stratified flames under strain effects. The first few principal components （PCs） with larger contribution ratios axe chosen as the tabu- lated scalars to build the look-up chemistry table. Prior tests show that strained premixed flame structure can be well reconstructed. To highlight the physical meanings of the tabu- lated scalars in stratified flames, a modified PCA method is developed, where the mixture fraction is used to replace one of the PCs with the highest correlation coefficient. The other two tabulated scalars are then modified with the Schmidt orthogonalization. The modified tabulated scalars not only have clear physical meanings, but also contain passive scalars. The PCA method has good commonality, and can be extended for building the thermo-chemistry table including strain rate effects when different fuels are used.

关键词： premixed flame stratified flame strain rate principal component analysis(PCA) chemistry table

Creep Behavior of Fusion Zone and Base Metal of the Electron Beam Weldments of a Near-alpha Titanium Alloy

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Journal of Materials Science & Technology 2010年第6期26卷 564-571页

作者： Zhiyong Chen Jinwei Li Jie Liu Qingjiang Wang Jianrong Liu Rui Fang Division of Titanium alloys Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Research Department of High Energy Density Beam Processing Technology Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 China AVIC shenyang liming aero-engine (group) corporation LTD Shenyang 110043 China

The high temperature creep behavior of fusion zone （FZ） and of a near-alpha titanium alloy Ti-60 has been investigated. base metal （BM） of the electron beam weldments While the BM shows a fully transformed, coarse primary β grains with large colonies consisting of aligned α lamellar, the FZ exhibits thin martensitic α′ platelets in the columnar β grains. The creep results show that the steady state creep rates of FZ follow the power-law creep, with the stress exponents obtained in the range from 5.6 （550℃） to 5.9 （600℃）, and corrected activation energies of 309-352 kJ/mol; the stress exponents of BM exhibit different values when the creep testing stress and temperature alternate. The values of 2.4-3.2 are obtained when the stresses are under 220 MPa or the temperature is 550℃, also an exponent of 6.6 is achieved at stresses above 220 MPa at 600℃. The corrected activation energies of BM corresponding to the stress exponents are 123-161 kJ/mol （n=2.4-3.2） and 344 kJ/mol （n=6.6）. The creep mechanisms of FZ and BM have been discussed in light of the creep microstructures, activation energies and the stress exponents. The creep mechanisms of FZ is the diffusion controlled dislocation climb, the creep of BM is controlled by ＇solute drag＇ creep and dislocation climb when the stress and temperature are different. Transmission electron microscopy （TEM） observations of the dislocation structures of crept specimens are presented to give some supports for the creep behavior of FZ and BM. In addition to the creep mechanism of dislocation movement, the interface sliding has been found to play an important role during creep of FZ.

关键词： Steady state creep Stress exponent Activation energy Electron beam welding Near-alpha titanium alloy

Modes of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys

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Journal of Materials Science & Technology 2012年第3期28卷 214-220页

作者： Xiangbin Meng Qi Lu Jinguo Li Tao Jin Xiaofeng Sun Jun Zhang ZhongqiangChen Yanhui Wang Zhuangqi Hu Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Graduate School of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Aviation Industry corporation of China(AVIC)shenyang liming aero-engine(group)corporation LTD. Shenyang 110043China

The modes of grain selection in spiral selector were investigated by both a ProCAST simulation and experimental *** results show that the efficiency of grain selection in starter block is associated with the geometry *** the early stage of grain selection,the optimization of grain orientation is dominated by competitive grain growth,but the optimization of grain orientation in starter block is gradually dominated by geometry shape at the later stage of grain ***,the spiral part could also optimize the orientation of the selected single crystal when the initial angle is large enough,and the single crystal selection in spiral parts with different pitch lengths and initial angles is dominated by different *** simulation results agree well with experimental ones.

关键词： Ni-base single crystal superalloys Competitive grain growth Geometry shape Directional solidification Spiral selector

Corundum dissolution in concentrated sodium hydroxide solution

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China Foundry 2016年第6期13卷 422-426页

作者： Yu-sheng Wu Hong-liang Li Feng-ling Shi xiao-fu Liu Gui-qao Su Yan-ping Qu School of Materials Science and engineering Shenyang University of Technology Shenyang 110870 China shenyang Research Institute of Foundry Shenyang 110022 China shenyang liming aero engine (group) Co. Ltd. Shenyang 110043 China

The corundum(α-alumina) core has been considered as a suitable candidate for investment casting of hollow, high pressure turbine engine airfoils due to its excellent properties. However, the efficiency of removing alumina cores in concentrated caustic solution cannot meet the needs of industrial production. In this paper, the effects of temperature and initial solution concentration on dissolution of α-alumina were studied by the classical weight-loss method. The fractal kinetic model was developed in order to describe α-alumina dissolution, assuming that the nonporous particles shrank during reaction process. The results show that the dissolution rate increases with increasing reaction temperature and initial solution concentration. Especially, the initial solution concentration has a significant influence on α-alumina dissolution rate at a higher reaction temperature. The activation energies decrease with increasing initial solution concentration, and the chemical reaction is the rate-controlling step.

关键词： kinetics corundum sodium hydroxide solution dissolution core

Experimental study of rotor blades vibration and noise in multistage high pressure compressor and their relevance

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Chinese Journal of aeronautics 2020年第3期33卷 870-878页

作者： Fengtong ZHAO Xiaodong JING Mingsui YANG Deyou WANG Yundong SHA Xiaochi LUAN School of Energy and Power engineering Beihang UniversityBeijing 100191China Liaoning Province Key Laboratory of Advanced Measurement And Test Technology of Aviation Propulsion Systems Shenyang Aerospace UniversityShenyang 110136China shenyang engine Design and Research Institute Aero Engine(Group)Corporation of ChinaShenyang 110015China

Rotor blades fault of aeroengine compressor is mostly caused by mechanical and aerodynamic *** the excitation factor of high intensity sound wave to rotor blades should not be *** researches are conducted on a multistage high pressure *** high level vibration occurs on the first stage of rotor blades, the noise spectrum presents typical characteristic for discrete multi-tone in the *** amplitude of blade vibration displacement and the sound pressure level of characteristic frequency noise increases and decreases simultaneously and reaches the maximum value at the same *** frequency merely occur on a certain speed range and is locked in a specific range which presents no variation with the rotating *** high level vibration occurs on the first stage of rotor blades, the noise spectrum presents a sharp peak and the propagation state of the characteristic frequency is a helix structure in the *** can be confirmed that acoustic resonance occurs in the multistage *** acoustic resonance frequency and its side band frequencies are generated by modulation of a rotating noise source at the rotor speed which is the excitation source of the rotor blades vibration.

关键词： Acoustic resonance Blades vibration Characteristic frequency Multistage compressor Source identification

Error modeling and compensating of a novel 6-DOF aeroengine rotor docking equipment

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Chinese Journal of aeronautics 2022年第6期35卷 312-324页

作者： Tianyi ZHOU Hang GAO Xuanping WANG Lun LI Qing LIU Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China AECC shenyang liming aero-engine Co. LtdChina

In the docking process of aeroengine rotor parts,docking accuracy that indicates the gaps between the end faces is strictly required.A key issue is improving docking accuracy using automated docking *** this paper,a systematic study is carried out on the error modeling and compensation of a novel six-degrees-of-freedom(6-DOF)docking equipment for aeroengine ***,a new model for indicating the main indexes of docking accuracy is ***,the error model of a specially designed 6-DOF docking equipment is established based on a modified Denavit Hartenberg method with five ***,two error compensation methods are *** on the above models,a docking accuracy simulation algorithm is proposed using the Monte Carlo ***,verification experiments are *** results show that,for the maximum values and standard deviations of the gaps between the rotor end-faces in the actual and target positions and attitudes,i.e.,main indexes that represent docking accuracy,the deviation rates between the simulation and experimental results are less than20%.The modeling methods have referential *** decline rates of these values are 50–65%when using the two proposed compensation *** compensation methods significantly improve the docking accuracy.

关键词： Accuracy analysis aeroengine rotor Docking Error compensation Error models Multi-degree-of-freedom structures