AVIC Shenyang Liming Aerospace engine Group Co.

Shenyang, China

AVIC Shenyang Liming Aerospace engine Group Co.

Shenyang, China
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Ye N.,CAS Shenyang Institute of Metal Research | Cheng M.,CAS Shenyang Institute of Metal Research | Zhang S.,CAS Shenyang Institute of Metal Research | Tai Q.,AVIC Shenyang Liming Aerospace Engine Group Co. | Guo Z.,AVIC Shenyang Liming Aerospace Engine Group Co.
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2015

To study the influence of surface integrity on the vibration fatigue properties of superalloy blade, the dynamic analysis of certain super-alloy blade during the experiment of vibration fatigue was performed by using the finite element method. The stress distribution during the vibration was obtained. The influences of residual stress and roughness on the vibration fatigue properties of blade were investigated. The results show that the stress amplitude in the vibration process increases at first and then decreases. There is a beat vibration phenomenon that the stress amplitude changes periodically during the blade resonance vibration. The limited fatigue strength of blade decreases with increasing residual stress and roughness. The relationship between the limited fatigue strength and residual stress is σfat=510.9-0.31-70.93σrest, and the relationship between the limited fatigue strength and roughness is σfat=9.67Rroughness 2-70.93 Rroughness+713.23. ©, 2015, Harbin Institute of Technology. All right reserved.


Zhang Z.-H.,AVIC Shenyang Liming Aerospace Engine Group Co. | Jia Y.-X.,CAS Shenyang Institute of Metal Research
Zhuzao/Foundry | Year: 2010

The slab of Ni base single crystal superalloy was fabricated in [001] orientaion by selector technique. This slab was cut into stress rupture samples of which orientaion deviate from [001] within 20°. Under low temperature 750°C and high stress 750 MPa condition, all samples with various misorientation acquire long creep lives and small creep strains. Although their primary creep strains are different, their creep rates in steady creep are equal roughly. Therefore, misorientations within 20° have little influence on whole creep lives. The common deformation feature of samples with different misorientation is formation of numerous stacking faults in γ' phase and entangling large quantities of dislocations in matrix, while their configurations are different in detail. When the misorientation is smaller than 20°, it can only produce a little effect on microstructure evolution and deformation mechanism.


Lin G.-Y.,Northeastern University China | Li J.,AVIC Shenyang Liming Aerospace Engine Group Co. | Zhao J.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2014

According to the thoughts of the system theory, taking the driving moment of hoisting system as generalized force, a dynamic model of elastomer and rigid body with many freedom degrees for hoisting system was established using the dynamic theory and Lagrange equation method. The vibration response of hoisting system was calculated based on the matrix iterative method under conditions of locked rotor and vertical boom spreading of bucket rod. The calculated dynamic load coefficient of the high-speed shaft and the hoisting rope is 1.343 and 1.374, respectively. The effects of locked-rotor time and soil stiffness on the dynamic load of hoisting system were analyzed and accordingly the dynamic load coefficients with different soil stiffness were obtained. To reduce dynamic load and ensure the safe functioning of device, the locked-rotor time should not be more than 2.0 s.


Gu X.-H.,Shenyang Aerospace University | Liu J.,AVIC Shenyang Liming Aerospace Engine Group Co. | Shi J.-H.,Shenyang Aerospace University
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

Influence of pre-heat treatment and subcritical quenching temperature on microstructure and mechanical properties of 45 steel was investigated through pre-heat treatment + subcritical quenching + tempering. The results show that mechanical properties of the steel depend on shape and quantity of retained ferrite after subcritical quenching. If quenching + high temperature tempering was used for pre-heat treatment, the retained ferrite became fine and needle-shape and mechanical properties of the steel increased after subcritical quenching. If annealing was used for pre-heat treatment the retained ferrite became coarse and mechanical properties of the steel decreased. With the subcritical quenching temperature increasing, the quantity of retained ferrite reduces and the strength and hardness of the steel are enhanced and the plasticity and toughness are decreased. Comparing with the conventionally quenching process, higher mechanical properties of 45 steel can be obtained by proper subcritical quenching process.


Gu X.-H.,Shenyang Aerospace University | Liu J.,AVIC Shenyang Liming Aerospace Engine Group Co. | Shi J.-H.,Shenyang Aerospace University
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

Influence of quenching and aging temperature on microstructure and mechanical properties of TC4 titanium alloy was investigated through microstructure observation and mechanical property test. The results show that with increasing quenching and aging temperature, the microstructure of the alloy becomes coarse. The strength increases first then decreases with quenching temperature increasing and the plasticity and toughness decrease with quenching temperature increasing. Quenched at the same temperature, the strength decreases and plasticity and toughness increase first and then decrease with aging temperature increasing.


Hu Y.,AVIC Shenyang Liming Aerospace Engine Group Co. | Bai S.,AVIC Shenyang Liming Aerospace Engine Group Co. | Chen Y.,AVIC Shenyang Liming Aerospace Engine Group Co. | Chen Y.,Shenyang Aeronautic Vocational and Technical College
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

Through experiment in wax pattern making, shell making, combination design of gating system, melting and pouring process, a series of new process were approached to eliminate the cold shut, misrun, shrinkage porosities and crack in gas turbine exhaust valve shell. The feasible process and parameters were determined, and the shell meeting the requirement was produced successfully.


Tan K.,Northwestern Polytechnical University | Li J.,Northwestern Polytechnical University | Guan Z.,Northwestern Polytechnical University | Yang J.,Northwestern Polytechnical University | And 2 more authors.
Materials and Design | Year: 2015

In the present paper, an internal-variable identification approach has been proposed to investigate the dynamic recrystallization (DRX) behavior during hot deformation and corresponding constitutive model has been constructed. Isothermal compression experiments of Ti55511 titanium alloy were conducted for verification. Plastic behavior is determined by dislocation evolution in many cases while deforming. The comparison between saturated and DRX critical dislocation density was made to distinguish the occurrence of dynamic recrystallization/recovery (DRV) during hot deformation. The influence of deformation parameters on DRX behavior was illustrated by dislocation evolution map, validated by the power dissipation efficiency distribution. DRX process during hot deformation of Ti55511 alloy tends to occur under moderate temperatures and low strain rates. In addition, a physical-based Arrhenius constitutive formula has been derived for DRX criticality. The strain-rate sensitivity coefficients during hot deformation were fixed as a constant equal to 1/6 and the deformation activation energy was related to the material's self-diffusion activation. © 2015 Elsevier B.V.


Bai S.,AVIC Shenyang Liming Aerospace Engine Group Co. | Chen Y.,Shenyang Aeronautic Vocational and Technical College | Hu Y.,AVIC Shenyang Liming Aerospace Engine Group Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

Large cylinder with 1410 mm in length and 615 in diameter and 223 kg in weight was produced with ZL101A aluminum alloy, which required high technical condition and casting quality. It is not allowed for slag inclusion, porosity, shrinkage hole, shrinkage on the surface of casting, and it is subjected to FS6 in the air seal test and 1.22 MPa pressure in the water seal test. Cylindrical structure is complicated with big size, uneven wall thickness, so there exists many hot spots, leading to easily generate the casting defects. Through the development of large aluminum alloy cylindrical castings, a set of effective methods to improve the qualified rate of leakage detection of large aluminum alloy casting bearing pressure were presented.


Wang D.-C.,AVIC Shenyang Liming Aerospace Engine Co. Group | Wu X.-J.,AVIC Shenyang Liming Aerospace Engine Co. Group | Ding W.,AVIC Shenyang Liming Aerospace Engine Co. Group
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2013

To optimize the precision forging process of double mounting plate structure of TC4 alloy low-voltage second stator blade, and get better microstructure, mechanical properties, the isothermal forging was introduced by using one step isothermal preforming instead of two steps general preforming. The simulation of isothermal forging process was conducted by FEM method, and the results show that the isothermal preformation has lower stress and the strain distribution is more uniform. The blade by isothermal preforming has uniform microstructure, and its mechanical properties are equivalent to those of the blade by general preforming.


Wang Y.-S.,Northeastern University China | Song J.-W.,AVIC Shenyang Liming Aerospace Engine Group Co. | Xing Y.,CAS Shenyang Institute of Automation | Xiu S.-C.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2016

Taking change law of specimen surface roughness under pre-stressed hardening grinding conditions as study object, 45 steel pieces were measured to analyze the influence mechanism of process parameters (pre-stress, grinding depth and feed speed) on the surface roughness. The experimental results show that the roughness is nonuniform and its value gradually increases from cut-in area to cut-out area. The increase of pre-stress value can decrease the surface roughness, inhibit surface microcosmic crack, reduce grinding temperature, and improve the surface quality of specimen. As same as to general grinding, the surface roughness gradually increases with the increase of grinding depth and feed speed. © 2016, Editorial Department of Journal of Northeastern University. All right reserved.

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