Avic South Aviation Industry Ltd Corporation

Zhuzhou, China

Avic South Aviation Industry Ltd Corporation

Zhuzhou, China
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Wang Y.,AVIC Zhuzhou Aviation Power Investment Casting Ltd Corporation | Li Z.,AVIC Zhuzhou Aviation Power Investment Casting Ltd Corporation | Tan X.,AVIC Zhuzhou Aviation Power Investment Casting Ltd Corporation | Zhou J.,AVIC Zhuzhou Aviation Power Investment Casting Ltd Corporation | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2017

Effects of surface processing on microstructure of single crystal turbine blade were investigated by the means of OM(optical microscopy), SEM(scanning electron microscopy). The results indicate that microstructure of recrystallization in solid solution treatment samples after surface processing can be observed in all surface of specimens and the thickness of recrystallization zone layer is 20 to 75 μm, and most of the recrystallized grain size is approximately 0.5 mm. The surface of turbine blade in solid solution treatment is absence of recrystallization after surface processing. The cellular microstructure of specimen with solid solution treatment can be observed in surface and the thickness of cellular layer is in range of 2 to 14 μm after surface processing and aging treatment. © 2017, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.

Yang W.,Nanchang Hangkong University | Yang W.,Collaborative Innovation Center for Aviation Manufacturing Industry of Jiangxi | Xia W.,Nanchang Hangkong University | Xu Z.,Nanchang Hangkong University | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2016

Adopting differential scanning calorimetry and copper-mould spray-casting methods, the near-equilibrium and sub-rapid solidification of K424 superalloy were investigated within a wide range of cooling rate between 0.17 K/s and 100 K/s. Using OM, SEM and EDS, the evolutions of primary γ phase, precipitated γ' phase, MC carbides and eutectic microstructure were described as a function of cooling rate. It is shown that γ phase is refined with the increasing of cooling rate, and the secondary dendrite spacing decreases from 84 μm at 0.17 K/s to 5 μm at 100 K/s. Moreover, the average size of precipitated γ' phase decreases because of the shortened time for transformation. Precipitation occurs once again as for heating the formed supersaturated solid solution during sub-rapid solidification. Both the refinement of γ phase and solute trapping decrease the extent of solute segregation, which leads to the reduction of the sizes of γ+γ' eutectic and carbides. © 2016, Science Press. All right reserved.

Li D.F.,AVIC South Aviation Industry Ltd Corporation | Li D.F.,Collaborative Innovation Center for Aviation Manufacturing Industry of Jiangxi | Hu X.,AVIC South Aviation Industry Ltd Corporation | Yang W.,Collaborative Innovation Center for Aviation Manufacturing Industry of Jiangxi | Yang W.,Nanchang Hangkong University
Applied Mechanics and Materials | Year: 2014

Copper mould spray casting and aging treatment were performed to investigate the microstructure evolution of a Ni-base superalloy. With increasing the cooling rate during solidification, the morphology of primary γ phase changes from coarse dendrite to fine dendritic structure with radial-like feature, accompanied by the inhibition of γ′ phase due to the shortened period during the subsequent solid state transformation process. After aging treatment, both the size and volume fraction of γ′ phase are increased with prolonging the isothermal time, which generate the morphology transition of precipitates from irregular and spherical to ellipse and rectangle due to the competition between the interface energy and strain energy. © (2014) Trans Tech Publications, Switzerland.

Zheng S.,Beijing Institute of Technology | Jia Y.L.,Beijing Institute of Technology | Tang J.,AVIC South Aviation Industry Co.
Materials Science Forum | Year: 2014

The directional solidification behavior of a first generation single crystal superalloy CMSX-6 was investigated. The solidification rate range in 25μm/s to 100μm/s and a thermal gradient G of 30K/cm were used for the present study. The experimental results show that the primary dendrite arm space (PDAS) decreased from (432±8) μm to (369±4) μm as the solidification rate increased, and the sizes of the eutectic pools also decreased as the solidification rate increased. And the volume fractions of eutectic γ/γ' were about 7% to 9% with different solidification rate. The γ/γ'- eutectic was comprised with coarse γ' phase and fine γ/γ' network. The morphology of the γ/γ' eutectic supported the possibility that the solidification of γ/γ' eutectic initiates with the formation of fine γ/γ'. © (2014) Trans Tech Publications, Switzerland.

Li X.H.,Beijing Institute of Technology | Li L.,Avic South Aviation Industry Ltd Corporation | Tang X.,Beijing Institute of Technology | Gai Q.D.,Beijing Institute of Technology
Materials Science Forum | Year: 2014

The microstructure, tensile and stress rupture properties of K492Malloy have been investigated in the present study. The results revealed that γ matrix, γ' phase, carbide and eutectic in the interdendritic region within grain interior and along grain boundary were observed after solidification. After heat treatment, γ' precipitates with two obviously distinct size existed in the dendrite core and interdendritic region, respectively. Meanwhile, the chain-like (W, Mo)6C and Cr23C6 carbides precipitated along grain boundary. The investigation of mechanical properties suggested that the tensile strength was initially increased but then decreased with increasing the temperature from 25°C to 760°C. The stress rupture life was 68.2h and 35.8h at 760°C/ 655MPa and 870°C/ 365MP, respectively. The columnar grain and carbide along grain boundary resulted in intergranular brittle fracture in both test conditions. As a result, the elongation under the conditions of 760°C/655MPa and 870°C/365MP was 1.5% and 1.4%, respectively. © (2014) Trans Tech Publications, Switzerland.

Yun H.-T.,Yanshan University | Yun H.-T.,AVIC South Aviation Industry Co. | Liang B.,Yanshan University | Ji H.,CAS Shanghai Institute of Ceramics | Zheng X.-B.,CAS Shanghai Institute of Ceramics
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | Year: 2012

Graphite-65wt.%Cu composite coating was deposited by air plasma spraying on 316 stainless steel substrate using graphite-65wt. %Cu composite powder with the particles' size in the range of 50~70 μm. Microstructure and phase composition were characterized by field emission scanning electron microscopy (FESEM) with energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Tribological properties of as-sprayed coatings were studied using the ball-on-disc friction and wear tester (UMT) under conventional conditions. The results show that the microstructure of as-sprayed coating is dense, which is well bonded with stainless steel substrate. The graphite particles uniformly distribute into the coating. The coating mainly consists of C, Cu and Cu 2O phases. Graphite transfered film results in the low friction coefficient, and the experiment values are in the range of 0.03 to 0.15. Adhesion wear is the main wear mechanism.

Dai X.-M.,AVIC South Aviation Industry Ltd Corporation | Su Q.-F.,AVIC South Aviation Industry Ltd Corporation | Zhu X.-X.,AVIC South Aviation Industry Ltd Corporation
Zhuzao/Foundry | Year: 2011

The paper presents the principle, characters and basic process of fluorescent penetrant inspection, and illustrates how to reduce the cost, improve process and promote the design by application of fluorescent penetrant inspection during the developing and manufacturing process of areoengine.

Li L.-H.,Northwestern Polytechnical University | Mo R.,Northwestern Polytechnical University | Chang Z.-Y.,Northwestern Polytechnical University | Zhang H.-M.,AVIC South Aviation Industry Co.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2015

To solve the problems of poor effect and difficulty of multi-factors coordination in man-made qualitative evaluation method for aero-engine assembly task priority, an evaluation method based on balanced weight and improved Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) was proposed. A synthetical and hierarchical evaluation model was built according to the relationship of task attribution, and the quantitative representation of indicators was given. The subjective and objective weights were separately determined by trapezoidal fuzzy scale-rough AHP and coefficient variation method, and the weight contribution balanced model was established to integrate subjective and objective weights. An improved TOPSIS replacing of Euclidean distance by Kullback-Leibler divergence was used to sort the weighted indicator values of evaluation objects. An enterprise application example was given to illustrate the correctness and feasibility of the proposed method. ©, 2015, CIMS. All right reserved.

Hu S.,Northwestern Polytechnical University | Yang H.,Northwestern Polytechnical University | Zhang Z.,AVIC South Aviation Industry Co. | Zhao J.,Northwestern Polytechnical University | Chang Z.,Northwestern Polytechnical University
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2014

A similarity measure method based on the geometry evolution sequence of three-dimensional process model is presented against the criterion that “similar parts structure have similar process” which would result in disadvantages such as big process knowledge granularity. First, we use a group of physical feature vectors which are affine-invariant, called shape descriptors, to express the feature value of the three-dimensional process model's geometry; Then, the changed voxels in the process model sequence will be obtained through comparing the difference of the shape descriptors; Next, we build the attribute adjacency graphs of two adjacent process models' geometry evolution by using the changed voxels and use the sequence of the attribute adjacency graph to express the geometry evolution process of the process model; Finally, a novel similarity measure method of machining process is achieved by comparing the sequence's similarity of the attribute adjacency graph. The case results proved the validity of the method.

Zeng Q.,Control Iron and Steel Research Institute, China | Yan P.,Control Iron and Steel Research Institute, China | Zhao J.C.,Control Iron and Steel Research Institute, China | Zhang L.F.,Control Iron and Steel Research Institute, China | Li L.,Avic south aviation industry Co.
Materials Science Forum | Year: 2014

A long term aging treatment at 900°C for 3000h was carried out on a conventional cast nickel base superalloy with standard solution and aging treatment. The microstructural evolution including the phases within grains and at grain boundaries (GBs) during thermal exposure in the alloy was observed using OM and SEM. It was shown that the major phases in the alloy after standard heat treatment were γ' precipitates and coarse blocky MC carbides, both of which were distributed not only within grains but also at GBs. During aging, the size of MC carbides and γ' precipitates both within grains and at GBs increased with increasing aging time. It was found that two characteristics of MC carbide and γ' precipitates evolved with aging time: the one is that the coarsening ratio of carbides and γ' precipitates at GBs were significantly higher than that of carbide and γ' precipitates inside the grains; the other is that the coarsening ratio of carbides was markedly higher than that of γ' precipitates. M6C carbide and h phase initially formed in the edge of MC carbide at the expense of MC carbides and γ' precipitates in the vicinity of MC during the early stage of aging. After 3000h, MC carbides inside the grains were covered by h phase films, while those distributed at GBs were completely decomposed into h phase and M6C particles. © (2014) Trans Tech Publications, Switzerland.

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