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2021 Vol. 64, No. 1/2
Published: 2021-01-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Effects of Microstructure Difference and Evolution on Tensile and Fatigue Properties of Ti6242 Alloy
ZHANG Mingda,CAO Jingxia,ZHOU Yi,DENG Ruigang,SHI Donggang,HUANG Xu
DOI: 10.16080/j.issn1671-833x.2021.01/02.014
The mechanical properties of the near-alpha titanium alloys Ti6242 alloy disc forgings usually have close relationship with the original microstructure of bars. In this study, three kinds of Ti6242 alloy bars with different original microstructure were selected to quantitatively analyze the difference and evolution of different microstructure characteristics, including the forged state, the solid solution state and the solid solution and aging state. The effects of the microstructure difference and evolution on the mechanical properties were also compared. The results showed that the differences of primary α phase volume fraction reduced after similar solid solution and aging treatment process, while the sectional area distribution and shape distribution of primary α phase still retained some differences. Room temperature tensile mechanical properties showed no significant difference, while the low fatigue property and dwell fatigue property exhibited significant difference. According to the microstructure difference analysis and mechanical property results, the original microstructure of bar with fine, non-equiaxed and no obvious orientation primary alpha phase contributed to good fatigue properties.
2021 Vol. 64 (1/2): 14-20 [Abstract] ( 161 ) HTMLNew PDF (3957 KB)  ( 311 )
       COVER STORY
22 A Review of Study on Deformation of Textile Composite Preforms
GUAN Wei, LI Wenxiao, DAI Ying, HE Pengfei
DOI: 10.16080/j.issn1671-833x.2021.01/02.022
The textile composite materials, as reinforced by fabrics with good integrity, overcome the shortcomings of traditional ones, such as low interlaminar shear strength, poor resistance to delamination, sensitive to cracking. Moreover, they have excellent near-net-forming ability and are easy to be molded. These advantages have led to the increasing use of these composite materials in aerospace, marine, automotive, medical devices, and other fields. Deformability of textile preform has important effects on its permeability and the mechanical properties of the final composite parts. The aim of this paper is to provide an review on the current state of the studies on the deformation of textile preforms. It starts by briefly introducing the structural characteristics of 2D and 3D fabrics, then the tensile, transverse compression, in-plane shear and out-of-plane bending deformation mechanisms of fabrics are elaborated. The research progress of deformation of textile preforms is summarized based on numerical simulation and experimental tests. Finally, the challenges and outlook of the numerical simulation on the deformation of preforms are outlined.
2021 Vol. 64 (1/2): 22-37 [Abstract] ( 183 ) HTMLNew PDF (5154 KB)  ( 1464 )
       FORUM
40 Investigations of Discontinuous Precipitation and Effects of Strengthening–Toughening Studies on Ni–Co–Al Alloys
ZHOU Yang, WANG Chentuo, ZHOU Fei, LIANG Jiamiao, WANG Jun
DOI: 10.16080/j.issn1671-833x.2021.01/02.040
The occurrence of discontinuous precipitation (DP) in multi-component alloys is usually considered to be deleterious to the mechanical properties. However recent studies have shown that lamellar nanostructure can be produced in Ni–Co–Al alloys via DP, which can be used to strengthen alloys similar to pearlites in steel. In order to further investigate the effect of discontinuous precipitation on the mechanical properties of Ni–Co–Al alloy, this article summarizes and discusses the changes in the microstructure and mechanical properties of the alloy under different alloy compositions and heat treatment conditions. The results show that the increase of Co content and lower aging temperature are favorable for the occurrence of discontinuous precipitation, and near-complete DP structure can effectively improve the strength and plasticity of Ni–Co–Al alloys. Through theoretical modeling, microstructure characterization and mechanical property analysis, the precipitation behavior of discontinuous precipitation and the mechanism of the reaction to strengthen and toughen Ni–Co–Al alloy are also discussed. This treatment method provides new ideas for researches on the strengthening and toughening of Ni–based superalloys.
2021 Vol. 64 (1/2): 40-50/73 [Abstract] ( 98 ) HTMLNew PDF (4966 KB)  ( 554 )
51 Effect of Crystal Orientation on High Cycle Fatigue Properties of Fourth Generation Single Crystal Superalloy DD15
SHI Zhenxue, LIU Shizhong, ZHAO Jinqian, WANG Xiaoguang, LI Jiarong
DOI: 10.16080/j.issn1671-833x.2021.01/02.051
The fourth generation single crystal superalloy DD15 with [001], [011] and [111] orientations was cast using seed method in the directionally solidified furnace. The high cycle fatigue properties of the alloy with different orientation were investigated at 800℃ . The microstructure, fracture surface and fatigue ruptured microstructure of the alloy with different orientation were studied. The results show that the alloy with different orientation has obviously various ascast dendritic structure and heat treated γ′ phase on the section perpendicular to the solidified direction. The high cycle fatigue properties of alloy at 800℃ has anisotropy and fatigue limit of the alloy decreases with the sequence of [111], [001] and [011] orientation. The high cycle fatigue of alloy with different orientation breaks along the plane. The angle between the fracture plane and the stress axis of the sample is different and decreases with the sequence of [011], [001] and [111] orientation. The high cycle fatigue fracture characteristics are basically the same. Fatigue source zone, crack propagation zone and transient fracture zone can be seen on the fracture surface of the alloy with different orientation. The fatigue crack initiated at or near the surface and propagated along {111} planes. The river pattern and fatigue striation can be seen in the crack propagation zone. The cleavage step and tear ridge can be seen in the transient fracture zone. The fracture mechanism is all quasi-cleavage fracture. The γ′ phase morphology still maintained cubic after fracture because of lower test temperature.
2021 Vol. 64 (1/2): 51-56/61 [Abstract] ( 138 ) HTMLNew PDF (4774 KB)  ( 315 )
57 Study on Processing Characteristics of Superalloy GH141
NIU Yongji,ZHANG Zhiwei,AN Ning,GAO Yang
DOI: 10.16080/j.issn1671-833x.2021.01/02.057
In this paper, the cold work hardening characteristics, static recrystallization characteristics and the effect of heat treatment on the hardness and microstructure of GH141 nickel-based deformation superalloy had been studied. The results show that the solution temperature of GH141 alloy must be above 1060℃. The cooling speed has a significant effect on the hardness, and the effect of water-cooling softening is obviously better than air cooling, which shows that precipitation hardening covers the softening effect of heat treatment during cooling. It needs to be heated above 1050℃for γ′ large-scale dissolution. The recrystallization of the cold deformed alloy can be completed at 1050℃ , and the grain coarsening will occur above 1120℃.
2021 Vol. 64 (1/2): 57-61 [Abstract] ( 110 ) HTMLNew PDF (2884 KB)  ( 271 )
62 Development of Typical Hard-to-Deform Nickel-Base Superalloy for Turbine Disk Served Above 800℃
JIANG He,DONG Jianxin, ZHANG Maicang, YAO Zhihao
DOI: 10.16080/j.issn1671-833x.2021.01/02.062
The aero-engine with high thrust-weight ratio needs to operate under higher temperature. In order to meet the requirements of high performance aero-engine, the alloying degree and mass fraction of γ′ phase keep increasing in the development of new wrought superalloy with higher service temperature. GH4151, GH4175 and GH4975 are typical nickelbase wrought superalloys with service temperature up to 800℃ . In present work, the domestic and overseas development of hard-to-deform superalloy is summarized. The characteristics of the three typical hard-to-deform nickel-base superalloy with high γ′ phase content are compared. In addition, the cogging technology and superplasticity characteristics of hard-todeform superalloy are discussed in detail. In summary, in order to fulfill the advantages of hard-to-deform superalloy with high γ′ phase content for turbine disk served above 800℃, there is still much research work need to be done in chemical composition and microstructure characteristics, characteristics of γ′ phase and control mechanism during hot deformation and superplasticity of the alloy
2021 Vol. 64 (1/2): 62-73 [Abstract] ( 140 ) HTMLNew PDF (3574 KB)  ( 1609 )
       APPROACHING SCIENCE
74 Focus on Ultrathin and Ultralight Composites, Leading Development of Zhongyuan Advanced Composites
2021 Vol. 64 (1/2): 74-75 [Abstract] ( 136 ) HTMLNew PDF (690 KB)  ( 96 )
       RESEARCH
76 Microstructure and Mechanical Property of Superplastic Deformed Ti–4.5Al–3V–2Fe–2Mo Alloy Sheet
FU Mingjie, ZENG Yuansong, HAN Xiuquan, Lü Fenggong, WANG Fuxin
DOI: 10.16080/j.issn1671-833x.2021.01/02.076
The superplasticity of Ti–4.5Al–3V–2Fe–2Mo alloy (SP700 alloy) was studied by the methods of maxium m value and constant rate under the conditions of 755~785℃ , 0.1~0.005s–1 and different tensile axis direction. Typical parts were formed and RT properties after superplastic forming were evaluated. The results showed SP700 alloy has excellent low temperature superplasticity with 3110% elongation at 775℃ and 45° direction with max m value tensile method. The capacity of anti-neck-shrink increased due to strain induced grains growing. The cone shape part formed at 755℃ with the highest height of 100mm under bidirectional pull stress condition, and microstructure has no significant change. RT properties of the sample with 33% deformation are 1027MPa ultrastrength and 16.8% elongation, which are little higher than those of undeformed specimens.
2021 Vol. 64 (1/2): 76-81/88 [Abstract] ( 93 ) HTMLNew PDF (5466 KB)  ( 253 )
82 Research on Mechanical Properties of Selective Laser Melting/Coaxial Powder Feeding Forming Connection
XUAN Minghao, ZHANG Rui, XING Bendong, WANG Xiangming
DOI: 10.16080/j.issn1671-833x.2021.01/02.082
The tensile and fatigue properties of TC4 selective laser melting/coaxial powder feeding forming joints were studied. By comparing the tensile test data under different linear energy density parameters, the influence of linear energy density on the tensile properties of TC4 formed joints was obtained. By comparing the median fatigue life and fatigue limit of the formed joints and the base metal at the same stress level, the attenuation degree of the fatigue characteristics of the formed joints relative to the base metal is obtained. Equivalent Kt was used to characterize the fatigue properties of formed joints, and the equivalent stress concentration factor Kte of formed joints was obtained. Compared with the welding process, the forming connection process has better fatigue characteristics.
2021 Vol. 64 (1/2): 82-88 [Abstract] ( 81 ) HTMLNew PDF (2755 KB)  ( 207 )
89 Electron Beam Fuse Additive Manufacturing Follow–Up Temperature Measurement Array System
LU Kaitong, PENG Yong,XU Haiying
DOI: 10.16080/j.issn1671-833x.2021.01/02.089
Real-time monitoring of the temperature field distribution of the electron beam fuse additive manufacturing process is of great significance for suppressing deformation and improving the manufacturing quality of electron beam fuse addition. A set of dynamic temperature measurement array system for electron beam fuse additive manufacturing process was developed. The system design, hardware integration, software preparation and test verification were carried out for the whole device. The results show that the follow-up temperature measurement array system can work stably in the harsh environment of high vacuum, high temperature, high radiation and high metal vapor in the process of electron beam fuse addition manufacturing, and can not only measure temperature under normal conditions, but also the temperature can be continuously measured when the additive substrate is heated and deformed, and the functions such as dynamic temperature measurement and real-time display, storage and reconstruction analysis of the temperature field can be realized, and the display image is intuitive, the system stability is strong, and the operation is simple.
2021 Vol. 64 (1/2): 89-93/102 [Abstract] ( 86 ) HTMLNew PDF (2003 KB)  ( 255 )
94 Design and Analysis of Passive Drive Brackets for Automatic Material Transfer
YANG Bo, JIANG Chen, FENG Lijie, WU Congyan, ZHOU Sihao, ZHANG Wei
DOI: 10.16080/j.issn1671-833x.2021.01/02.094
Aiming at the development trend of product transfer automation and assembly digitization of the existing spacecraft digitization assembly line. A set of full-process transshipment equipment compatible with the production line and a multi-geometry bracket are designed. Based on the analysis of product transfer process, guarantee requirements and assembly requirements, a general design scheme of passive drive bracket based on power source of roller is proposed. The key force parts and weak points of the bracket are analyzed. Meanwhile, the design, calculation and verification of key components were carried out. In addition, the numerical simulation analysis and verification were carried out using special software. After the trial production of the bracket was completed, the engineering trial was carried out. The results showed that the deviations of the numerical simulation of strength and calculation values of theoretical design of the key components are within 10%, and the displacement deformation is kept below 0.1mm, which verifies the accuracy and rationality of the design. The function and performance of the bracket meet the requirements of on-site use during the engineering application stage.
2021 Vol. 64 (1/2): 94-98 [Abstract] ( 106 ) HTMLNew PDF (3070 KB)  ( 277 )
99 Research and Application of Cold Shrinkage Assembly of Self-Lubricating Joint Bearing
SHU Yang, CHEN Aimin, LUO Jinwei, XIONG Qinlin
DOI: 10.16080/j.issn1671-833x.2021.01/02.099
Affected by the operation space, a certain type of model of the vertical joint bearing and the bearing housing must be assembled by hand. It is easy to cause the stuck problem in the assembly process of the bearing. Combining with the assembly clearance and assembly time requirements of the self-lubricating joint bearing, the specific influence law of temperature field change on the deformation of self-lubricating joint bearing is analyzed based on ABAQUS simulation. The specific requirements for the bearing temperature during the cold shrink assembly of the bearing are put forward. The curve of the bearing temperature with time in 20°C assembly environment is monitored by experiments. The results show that the cold shrinkage temperature of the bearing is lower than –2°C, which meet the assembly needs. According to the finite element simulation analysis and experimental results, the bearing cold shrinkage assembly method was successfully applied to the model, which solved the stuck problem of the self-lubricating joint bearing of the model, and can be popularized and applied in other models.
2021 Vol. 64 (1/2): 99-102 [Abstract] ( 81 ) HTMLNew PDF (1470 KB)  ( 210 )
  Notices
· 'Aeronautical Manufacturing technology ' is included in EI database
· China Science Citation Database (CSCD)
· Chinese S&T Journal Citation Reports (CJCR)
· World Journal Clout Index (WJCI) Report of Scientific and Technological Periodicals
· Supported in China Science and Technology Journal Excellence Action Plan
· Aeronautical Manufacturing Technology ranked No. 3 in Chinese S&T Journal Citation Reports (CJCR)
· High Quality Sci-tech Journal Classification Catalogue in Aerospace Field （2023）
· A Guide to the Core Journals of China (hosted by Peking University Library)
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