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MULTIBRANCH BLOCK-BASED GRAIN SIZE CLASSIFICATION OF HYBRID DISK USING ULTRASONIC SCATTERING: A DEEP LEARNING METHOD

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materials evaluation 2024年第4期82卷 38-52页

作者： Liu, Xiao Sha, Zheng-Xiao Liang, Jing AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aeroengine Corp. of China Beijing100095 China

To assess the grain size of hybrid disks, we propose a simple network architecture—the wide-paralleled convolutional neural network (WP-CNN)—based solely on multibranch blocks and create a grain size classification model based on it. Multibranch blocks are used to enhance the capability of feature extraction, and the global average pooling layer was implemented to reduce the number of model parameters. To train and test the model, a dataset of ultrasonic scattering signals from a hybrid disk was constructed. The WP-CNN structure and hyperparameter selection were examined using the training set. The experiment demonstrated that, compared to traditional 1D convolutional neural network, 1D ResNet, and InceptionTime, the classification accuracy of this method can reach 92.3%. A comparison is made with the empirical mode decomposition scattering model and frequency spectra tree model. The proposed network provides accurate classification of grain size without physical parameters and specific physical models. The results show the deep learning method has the feasibility to evaluate hybrid disk grain size distribution. ©2024 American Society for Nondestructive testing.

关键词： Convolutional neural networks

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Effect of Different Scanning Modes and Heat Treatment on Microstructure and Mechanical Properties of GH4169 Manufactured by Selective Laser Melting 5th

Effect of Different Scanning Modes and Heat Treatment on Mic...

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5th China Aviation science and technology Conference, 2021

作者： Zhou, Jingyi Wei, Zhenwei Tang, Siyi Zhao, Wenxia Guo, Shaoqing Wang, Jian Zhao, Zijun AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China Aero Engine Corporation of China Beijing100097 China

ISBN: (纸本)9789811674228

GH4169 superalloy was prepared by selective laser melting technique. The samples were obtained by scanning in a single direction per layer and scanning in a 90° direction per layer, respectively. The microstructure and precipitated phase were compared and analyzed by OM, SEM and EDS to investigate the non-equilibrium microstructure characteristics and the influence mechanism on mechanical properties of laser additive manufacturing materials of GH4169 under three heat treatment systems. The results show that in the X direction of laser scanning deposition, the tensile strength at room temperature of the material with the same scanning direction of each layer is 4.5% higher than that of the material with the scanning direction of 90°, and the reduction of area is 75.6% higher. After solution and aging treatment, δ phase was precipitated and Laves phase was partially dissolved, but the element segregation in the remelting zone between the cladding layers was not completely eliminated. Homogenization treatment at 1050 ℃ for 1h promotes uniform distribution of segregation elements in cladding layer, remelting layer and dendrite. After homogenization treatment at 1100 ℃ for 1h, Laves phase was fully redissolved, and δ phase and strengthening phase γ ‘ were precipitated again after solution and aging. After heat treatment, the tensile strength at room temperature of the samples prepared by the two laser scanning methods is basically the same in the X direction. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Scanning

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Creep behavior and effect factors of a TiAl–Nb alloy at high temperature

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Progress in Natural science:materials International 2021年第3期31卷 477-485页

作者： Shunke Zhang Sugui Tian Gengyu Li Ning Tian Fangwei Jin Huichen Yu Xiaoxia Lv Guangyan Wang Deyuan Li Shenyang University of Technology Guizhou University of Engineering Science Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory AVIC Beijing Institute of Aeronautical Materials

The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was *** results showed that the microstructure of forged alloy mainly consisted of γ/α2lamellar colonies and fine equiaxed recrystallized γ/α*** the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed *** with the forged alloy the creep life of the solution treated alloy at 800℃/220 MPa increased from 116 h to 339 *** better creep resistance may be attributed to the transform of fine equiaxed γ/α2grain to the lamellar colonies with serrated grain boundaries due to the solution *** deformation mechanism of the solution treated alloy during creep is considered to be dislocation slipping within the lamellar γ/α2phases,and the dislocation movement may be hindered by the γ/α2interface and the formation of dislocation *** interaction of the dislocations with the tangles may increase the resistance of the dislocation motion and hence improve the creep resistance of the *** was found that during the creep of the forged alloys the cracks mainly initiated at the equiaxed grain,and in the solution treated alloy the cracks initiated at the grain *** creep continued the cracks propagated and connected to each other,leading to the damage and rupture of the forged and solution treated alloys.

关键词： Forged TiAl–Nb alloy Solution treatment Microstructure Creep Deformation and damage

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Fracture failure analysis of sensor combination pipes

Fracture failure analysis of sensor combination pipes

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2022 International Conference on Optoelectronic Information and Functional materials, OIFM 2022

作者： Huanping, Kong Changkui, Liu Delin, Liu Aecc Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing China Aecc Failure Analysis Center Beijing China

ISBN: (数字)9781510655126

ISBN: (纸本)9781510655119

The sensor combination pipes fractured during operation. Through macro and micro morphology observation, energy spectrum analysis, metallographic examination and hardness test, the pipes failure properties and reasons were determined. The results showed that the failure property of dynamic pressure pipe was stress corrosion fracture, and the failure property of the static pressure pipe was corrosion fatigue cracking. The pipes failure was related to the absence of stress relief annealing, and mechanical damage on the pipe surface promoted static pressure pipe failure. © 2022 SPIE.

关键词： Corrosion fatigue

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The Evolution Behaviors of Carbides in the Cobalt-Base Superalloy During the Long-Term Heat-Treatments

SSRN

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SSRN 2024年

作者： Teng, Chaoyi Liu, Changkui Liang, Daizong Zhang, Lihui Huang, Qiang AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing China

The carbides evolution behaviors in the equiaxed-crystal cast cobalt-base superalloy during the long-term heat-treatments were studied. The heat-treatment conditions were chosen referred to the real service conditions of the turbine vanes in aero-engines. The Type I M23C6-matrix and Type II M7C3-matrix eutectics were found in the as-cast alloy, but only M23C6-matrix eutectic was found in the heat-treated alloys. The new potential mechanism of the M7C3→M23C6 transformation is proposed. The M23C6-matrix eutectics went through the further decomposition, but large amounts of the lath-like secondary M23C6 formed during the heat-treatments. Regarding the MC carbides, the temperature and duration time of the heat-treatments had significant impacts on their morphologies. The new explanation for the serrations on the primary MC carbide edges after the heat-treatment is proposed. © 2024, The Authors. All rights reserved.

关键词： Eutectics

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Fracture Failure Analysis of Gear Teeth 6

Fracture Failure Analysis of Gear Teeth

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2021 6th International Conference on Applied Mechanics and Structural materials, AMSM 2021

作者： Liu, Chunjiang Ouyang, Kang Jiang, Tao Liu, Changkui AECC Beijing Institute of Aeronautical Materials Beijing100095 China Failure Analysis Center of Aviation Industry Corporation of China Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China Wuhu Machinery Plant Wuhu241007 China

Gears are important transmission components in the field of aviation industry. Failure cases such as fatigue fracture and fatigue spalling often occur due to poor conditions, and the status of teeth surface is usually one of the important elements for the failure cause analysis, but few have analyzed how the machining status of gear end surface affects the fracture failure. In this paper, one engagement failure of two gears was studied, and the failure phenomenon is as follows: all teeth of the driving gear fractured, two adjacent teeth of the driven gear fractured and several locations of teeth bottom cracked. According to the fracture morphology of the gear, it is judged that the driven gear fatigue-cracked firstly, and the fatigue zone is located at the lower end surface rather than the tooth bottom. Material structure, machining status of gear end surface, and the thickness of nitriding layer were inspected. In addition, the difference of the machining status between the lower and the upper end surface was analyzed. The results show that compared to the upper end surface, the lower end surface is smoother and the grinding amount is relatively larger. The residual stress tested by XRD shows that there is a residual compressive stress of about 84 MPa on the upper end surface and a residual tensile stress of about 238 MPa on the lower end surface. The tensile stress and the working stress cause the local stress level of the lower end surface of the gear to be higher than the fatigue strength, causing fatigue cracking from the lower end surface. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Tensile stress

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Failure analysis of smoke lampblack machine crack

Failure analysis of smoke lampblack machine crack

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2022 International Conference on Metallurgical Engineering and Automation technology, MEAT 2022

作者： Kong, Huanping Jiang, Tao Zhao, Kai Liu, Changkui AECC Beijing Institute of Aeronautical Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China AECC Failure Analysis Center Beijing100095 China

The smoke lampblack machine cracked in use. Through macro and micro morphology observation, energy spectrum detection, metallographic examination and finite element simulation calculation and analysis, the failure nature and reason of the smoke lampblack machine were determined. The results showed that the cracking property was corrosion fatigue, and the cracking of the smoke lampblack machine was caused by the damage of the protective layer in the vibration environment. It was suggested that the surface protection of smoke lampblack machine should be strengthened and the structural design of stress concentration should be improved. © Published under licence by IOP Publishing Ltd.

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Fatigue test fracture analysis of aircraft blade connecting pin 8

Fatigue test fracture analysis of aircraft blade connecting ...

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2022 8th International Conference on Mechanical Engineering, materials and Automation technology, MMEAT 2022

作者： Wang, Zhanbin Chen, Guoquan Jiang, Tao AECC Beijing Institute of Aeronautical Materials Beijing100095 China AVIC Harbin Aircraft Industry Group Co. LTD Heilongjiang 150066 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China

During the fatigue performance verification test of the blade simulator, a fixed connecting pin on which the splint was installed broke. In this paper, the fracture properties of the connecting pin were determined by observing the macro/micro morphology of the connecting pin and the fracture surface of the coating. By analyzing the elements, structure, hardness and relative ratio of the body and coating, the differences between the connecting pins of different blades were studied, and the fracture causes of the connecting pins were comprehensively analyzed. Based on the above experiments, the influence of coating quality on fatigue cracking is analyzed, and the improvement scheme of connecting pin is put forward. © Published under licence by IOP Publishing Ltd.

关键词： Coatings

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Anisotropy of microstructure and tensile properties of additive manufactured ZTC4 alloy 3rd

Anisotropy of microstructure and tensile properties of addit...

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3rd International Conference on materials science and Industrial Applications, MSIA 2021

作者： Wei, Zhen-Wei Xing, Wei-Jie Chen, Bing-Qing Jiang, Tao AECC Beijing Institute of Aeronautical Materials Beijing100095 China Failure Analysis Center of Aviation Industry Corporation of China Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Materials Testing and Evaluation AECC Beijing100095 China

ISBN: (纸本)9783035738056

ZTC4 alloy prepared by electron beam melting was hot isostatically pressed, the macroand microstructure were characterized by stereo microscopy and optical microscopy, the tensile properties were tested and the fracture profiles were characterized using scanning electron microscopy. The results show that: The vertical deposition samples exhibit coarsen epitaxial columnar grains and the parallel samples show equiaxed grains, and microstructure are basket-weave α+β phase. The vertical deposition samples exhibit very high ultimate tensile strength and yield strength but poor ductility with elongation and shrinkage, and show generally more planar and faceted fracture morphology. The anisotropy in tensile properties is mainly due to the difference in the orientation of the columnar grains with respect to the tensile test direction, and the characteristics of the minor fracture plane are mainly related to the α colonies. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Anisotropy

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Failure analysis of sensor diaphragm cracking

Failure analysis of sensor diaphragm cracking

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2021 International Conference on Electronic materials and Information Engineering, EMIE 2021

作者： Huan-Ping, Kong De-Lin, Liu Chang-Kui, Liu AECC Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing China AECC Failure Analysis Center Beijing China

The sensor diaphragm cracked during the test project. Through macro and micro morphology observation, metallographic examination and hardness test, the diaphragm failure properties and reasons were determined. The results showed that the failure nature of the faulted diaphragm was bidirectional bending fatigue cracking. 1# crack failure was related to the greater bending stress borne at the bottom of the outermost corrugation. 2# crack failure was related to the greater stress borne by the root at the boundary between the outermost corrugation and the outer edge, the appearance of grain boundaries caused by the pickling process promoted the initiation and propagation of 2# crack. © Published under licence by IOP Publishing Ltd.

关键词： Diaphragms

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