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Accurate Determination of Trace Sulfur in Superalloys and Its Application 11

Accurate Determination of Trace Sulfur in Superalloys and It...

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11th Annual International Conference on Material science and Environmental Engineering, MSEE 2023

作者： Wei, Jianhuan Wu, Yujie Gao, Jinfeng Ye, Jingjing AECC Beijing Institute of Aeronautical Materials China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation China

The accurate determination technology of trace sulfur in superalloys adopts the latest infrared carbon/sulfur analyzer CS844ES, and carries out technological innovation in five aspects: the three calibrations technology at both ends, the ultrapure composite flux, the reference material traceability technology, the blank influence value determination technology, and the criteria for the accurate determination of trace sulfur. The lower limit of sulfur measurement is extended to 0.5ppm. After appraisal, it has reached the international advanced level. Two reference materials of wrought superalloy GH4169 with trace Sulfur concentration were developed by this technology. Finally, the accurate determination technology of trace Sulfur in superalloys, independent intellectual property rights and trace sulfur reference materials constitute a "Trinity" technical system. This technical system was used to measure GH4169 superalloy in the United States and China at the same time, and the results showed that there are differences in sulfur content among them. This technology is mainly applied independently and has been applied in relevant units and won many technical awards. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Superalloys

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Study on high cycle fatigue performance at elevated temperature for a selective laser melted Ti6Al4V alloy 2

Study on high cycle fatigue performance at elevated temperat...

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2nd International Conference on Frontier materials, ICFM 2023

作者： Jiao, Z.H. Xu, R.D. Yu, H.C. Wu, L.L. Wu, X.R. AECC Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials Beijing100095 China

Selective laser melted Ti6Al4V alloy has broad application prospects in aeroengine field. In this study, high cycle fatigue tests were carried out systematically using hourglass shaped specimen (K t=1) at 400 °C. The S-N curves were acquired and compared with data of the casting and the forging. The anisotropy and the defect effects of the fatigue performance were analysed. The LOF defects on the surface and subsurface preferentially act as the fatigue crack initiation site for almost all the tested HCF specimens. The position and irregularity of defect have greater influence on elevated temperature fatigue life than the defect size. The fatigue strength of horizontal orientation is lower than that of vertical orientation, because of the characteristics of larger size, more irregular shape and higher density for the crack source defects of horizontal specimens. The fatigue performance of the SLM Ti6Al4V alloy in this study is better than that of the casting and even the forging, but the dispersion of fatigue data of the SLM alloy is much greater than that of the both traditional process alloys. © 2023 Published under licence by IOP Publishing Ltd.

关键词： Titanium alloys

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Quantitative study of high-frequency fatigue hole-edge stresses in nickel-based single-crystal superalloy 2

Quantitative study of high-frequency fatigue hole-edge stres...

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2nd International Conference on Frontier materials, ICFM 2023

作者： Li, Leyu Li, Zheng Liu, Jiabin Zhang, Jingang Deng, Zhiwei Li, Quanwei Liu, Xinling AECC Beijing Institute of Aeronautical Materials China AVIC Failure Analysis Center China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation China

In this paper, the influence of air film holes on the stress distribution of nickel-based single-crystal superalloy blades is investigated, a simulated test piece is designed for the analysis and test of the stress distribution of air film holes, and a method of quantitative inverse inference of the stress at the edge of the air film holes is proposed. Finite element simulation of high circumferential vibration fatigue of the simulated test piece was carried out by ANSYS to obtain the gradient of stress distribution at the hole edge. The EBSD technique was used to measure the dimensions of the plastic zone in the region near the fracture, and the quantitative fatigue stresses were extrapolated using a crack tip plastic zone model with Tresca yield criterion. The compressive stress exerted by the femtosecond laser perforation method on the air film aperture wall was detected by the nanoindentation technique, and the residual stress was analysed using the S. Suresh computational model. The results of this study show that based solely on finite element simulation, it is not possible to completely simulate the effect of residual stresses caused by machining on fatigue fracture, which in turn leads to a lack of conformity between the results of finite element simulation and the results of the inverse plastic zone size extrapolation;however, the stress magnitude at the edge of the hole can be well computed by combining the stress concentration coefficients from finite element simulation with the stresses from the inverse plastic zone size extrapolation after taking into account the residual stresses from machining. The quantitative analysis results of this method have an error within 1.3 times the dispersion band compared to the test data. © 2023 Published under licence by IOP Publishing Ltd.

关键词： Nickel

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Effect of Surface Grain Refinement on Microstructure and Properties of K465 Superalloy 6th

Effect of Surface Grain Refinement on Microstructure and Pro...

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6th China aeronautical science and technology Conference, CASTC 2023

作者： Wei, Zhenewei Liu, Changkui AECC Beijing Institute of Aeronautical Materials Beijing100095 China Failure Analysis Center of AVIC 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 Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation AECC Beijing100095 China

ISBN: (纸本)9789819988662

In this paper, the microstructures were studied by OM and SEM, and the tensile and stress rupture properties were tested for K465 superalloy casted by surface grain refinement and conventional technology. The results showed that: Compared to conventional casting, the surface grain size was refined from M-4 to M-9;The secondary dendrite spacing and eutectic content decreased, while the carbide content decreased from 6.18% to 4.36%;The volume fraction of γ′ had no change, the size of γ′ reduced both in core- and inter-dendritic region, and the homogeneity of microstructure improved;The room tensile strength and plasticity both improved. The medium-temperature stress rupture property improved significantly (800 ℃/600MPa), and the high-temperature stress rupture property decreased (975 ℃/225 MPa), which still met the specification. The change of mechanical properties is due to the refinement of the structure. © 2024, Chinese Society of Aeronautics and Astronautics.

关键词： K465 Superalloy Microstructure Stress Rupture Surface Grain Refinement

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Study of the calculation IR and modeling on nitrile rubber

Study of the calculation IR and modeling on nitrile rubber

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2024 International Conference on materials Engineering and Intelligent Manufacturing, CMEIM 2024

作者： Han, Yu-Tian Liu, Chang-Kui AECC Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China

Nitrile rubber (NBR) is a common analysis object in the field of non-metallic failure analysis. Usually, the sample state greatly affects the quality of the spectrum when collecting its infrared spectrum (IR), leading to increased difficulty in interpretation. This paper took NBR as an example and carried on a discussion and comparative analysis for the calculated IR of NBR and its Modelling. As a result, a polymer modeling method for computational IR was proposed. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： III-V semiconductors

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The Low Cycle Fatigue Behavior of a First Generation Single Crystal Superalloy CMSX-6 at 770 °C 9th

The Low Cycle Fatigue Behavior of a First Generation Single ...

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9th International Symposium on Hydrogen Energy, Renewable Energy and materials, HEREM 2023

作者： Shuai, Zheng Wei, Xu Xueqin, Hou Jian, Zhang Yanfei, Liu Jianwei, Xu Xuanning, Zhang Science and Technology On Advanced High Temperature Structural Materials Laboratory AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation AECC Beijing Institute of Aeronautical Materials Beijing100095 China Aviation Key Laboratory of Science and Technology On Materials Testing and Evaluation Beijing100095 China AECC Sichuan Gas Turbine Establishment Chengdu610500 China

ISBN: (纸本)9789819736850

The investigation of the low cycle fatigue behavior of a first generation single crystal superalloy CMSX-6 were presented. Specimen of CMSX-6 alloy with standard heat treated were test by the fatigue testing machines. The study indicate the low cycle fatigue of CMSX-6 is about 965MPa at 770 °C, R = 0 with a cycle number of 106. Subjected to periodic loads, the dislocation movement in the alloy is restricted to a small part of the crystal plane at the stress concentration area and intensive local slip occurs, resulting in plastic deformation in the local area, and the straight shape of the specimen side became crooked. SEM observation indicate that the fatigue cracks initiate from the internal microporosity of the specimen, and the transient fracture is formed after the crack propagation. The oxidation in crack propagation zone is serious, and the fatigue bands are not visible. Shear dimples were found at the transient fault zone. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Single crystals

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Influence of alloying elements on the microstructure and properties of Ti2AlNb

Influence of alloying elements on the microstructure and pro...

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2024 International Conference on Optoelectronic Information and Functional materials, OIFM 2024

作者： Wei, Zhenwei Ma, Li Tan, Dongcan Deng, Zhiwei 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 Key Laboratory of Science and Technology on Materials Testing and Evaluation AECC Beijing100095 China

ISBN: (纸本)9781510680517

The effects of commonly added microalloying elements on the organizational properties of Ti2AlNb alloys are described, the direction of better microalloying systems to obtain the best overall performance is identified, and the effects of different alloying element types as well as their contents on the microstructure and properties of Ti2AlNb alloys are comparatively analysed to put forward the problems existing in the current research, and to think about the direction of the development of the future Ti2AlNb alloy material process. © 2024 SPIE.

关键词： Alloying elements

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Stability of the microstructure and properties of Ti2AlNb alloys under thermal exposure conditions 2

Stability of the microstructure and properties of Ti2AlNb al...

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2nd International Conference on Frontier materials, ICFM 2023

作者： Wei, Z.W. Ma, L. You, L. Liu, C.K. 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

In this paper, the microstructure and property stability of Ti2AlNb alloy specimens treated by thermal exposure at 800°C for 0∼12h were investigated using universal tensile tester, X-ray diffractometer, scanning electron microscope, electron backscattering diffraction, and in-situ tensile scanning electron microscope. The results show that with the extension of thermal exposure time, the tensile strength and yield strength of the alloy slightly increased, the B2-phase of the alloy decreased while the O-phase increased, and the content of the α2-phase also slightly decreased. It has been found that the properties changes are related to the changes of microstructure. The tensile cracks expanded along the grain boundaries between the O-phase and B2-phase as well as along the O-phase grain boundaries. The slight changes in microstructure and properties indicate that the Ti2AlNb alloy is stable and reliable for short-term service at 800 °C. © 2023 Published under licence by IOP Publishing Ltd.

关键词： Microstructure

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Two-time Calibration at Both Ends for Sulfur Measurement by Using High Frequency Induction Infrared Absorption Method 9

Two-time Calibration at Both Ends for Sulfur Measurement by ...

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9th Annual International Conference on Material science and Environmental Engineering, MSEE 2021

作者： Wei, Jianhuan AECC Beijing Institute of Aeronautical Materials Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Aviation Key Laboratory of science and Technology on Materials Testing and Evaluation China

High frequency induction heating infrared absorption method is a relative measurement method, and it requires calibrating the analyzer during the measurement process. Usually, one-time calibration on an analyzer is made for high sulfur value by using standard substances. The method proposed by this paper calibrates carbon-sulfur analyzers with a method of two-time calibration at both ends, which eliminates the impact of sulfur blank and thus improves the accuracy and precision of ultra-low sulfur measurement. The method extents the lower limit of measurement of sulfur in high temperature alloy, to 0.00005%, namely, 0.5ppm. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Calibration

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Research Progress on Influencing Factors of Bolted Joint Structure Loosening 4

Research Progress on Influencing Factors of Bolted Joint Str...

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2023 4th International Conference on Mechanical Engineering and materials, ICMEM 2023

作者： You, Long Liu, Changkui Chen, Hehe Fan, Hao AECC Beijing Institute of Aeronautical Materials Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China College of Materials Science and Engineering Nanchang Hangkong University Nanchang330063 China

Loosening of bolted joint structure is a critical failure mode mainly caused by the slippage and friction behaviours on the thread and bearing surfaces. Domestic and foreign scholars have conducted a series of studies on the loosening mechanism and anti-loosening methods of bolted joint structures;however, there are fewer summaries on the influencing factors of loosening of bolted joint structures. This paper takes the phenomenon of loosening of bolted joint structure as the research object, summarizes the research method of loosening of bolt joint structure and the influencing factors, and summarizes the influencing law of loosening of bolted joint structure in four aspects, namely, preload force, external load factors, structural factors, and operating temperature, to provide references for the design of anti-loosening of bolted joint structure. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Bolted joints

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