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2021 Vol. 64, No. 12
Published: 2021-06-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Characteristic of Sn–Cu Powder Fabricated by Laser Shock–Centrifugal Atomization
ZHAO Xingke, XING Desheng,ZHAO Zenglei
DOI: 10.16080/j.issn1671-833x.2021.12.014
High–performance metal powder is an important support for the development of metal additive manufacturing technology. A new method of laser shock–centrifugal atomization was used to prepare tin–copper alloy powder. The influence of process parameters on the morphology of metal powders was studied. The results show that the metal powder particle is spherical with smooth surface, and is mainly distributed in range of 1–20μm. A higher laser energy density input is beneficial to obtain metal powders with a narrower particle size distribution.The ration mechanism of laser atomized powder is discussed preliminarily.
2021 Vol. 64 (12): 14-19 [Abstract] ( 142 ) HTMLNew PDF (28670 KB)  ( 59 )
       COVER STORY
20 Research Progress on Joining of Solid Solution Strengthened Nickel-Based Superalloy and Its Welding With Dissimilar Materials
CHEN Guoqing,ZHANG Ge,LIU Zheng,SHU Xi,ZHANG Binggang
DOI: 10.16080/j.issn1671-833x.2021.12.020
Solid solution strengthened nickel-based superalloy has high service temperature, good high temperature oxidation resistance and corrosion resistance, and is widely used in the manufacture of high temperature parts such as aero-engine and ultra-supercritical power station. Compared with precipitation strengthened nickel-based superalloy, the weldability of solid solution strengthened nickel base superalloy is relatively better, and the formation of welding cracks can be avoided by adjusting welding process and alloy composition. With the increasing application of solid solution strengthened nickel-based superalloys, the welding of superalloys and dissimilar materials shows great research value. Therefore, the research progress of solid solution strengthened nickel-based superalloy and its welding technology with dissimilar materials is reviewed in this paper, which mainly involves argon arc welding, laser welding, electron beam welding, brazing and diffusion bonding, and the research prospect of solid solution strengthened nickel-based superalloy welding is also discussed.
2021 Vol. 64 (12): 20-27 [Abstract] ( 193 ) HTMLNew PDF (22824 KB)  ( 115 )
       FORUM
30 Process Characteristics of Laser Direct Joining of PEEK to Aluminum Alloy
XIA Peiyun, MENG Yao,SHEN Haoran,Lü Hongya,DIAO Lei,FENG Xiaosong,WANG Chunming,YIN Yuhuan
DOI: 10.16080/j.issn1671-833x.2021.12.030
2mm-thick aluminum alloy 2195 with phosphate anodizing pretreated and no pretreatment were joined to 3mm-thick PEEK (Poly ether-ether-ketone) by laser direct joining process, the differences of joint appearance, microstructure of interface and tensile shear force were analyzed under different process parameters. The results show that Al-PEEK dissimilar joint has an arc shaped melted zone in side of PEEK. Compared to Al-PEEK joints without pretreatment, there are dispersed pores with different size in melted zone but no visible gap at interface for anodized AlPEEK dissimilar joints. Anodizing pretreatment could remarkably strengthen Al-PEEK dissimilar joints. The maximum tensile shear force could reached 4479N (PEEK with width of 30mm), when laser power at 1400W, welding speed at 3mm/s, while failure position is in PEEK with interface not separated. There is a transition layer between Al and PEEK about thickness of 4μm, the same with anodizing film. In this transition layer, it is speculated that chemical bonding of “Al-O-PEEK” may be formed, according to the variation trend of element Al and O concentration, which is the main reason for improving the joints strength.
2021 Vol. 64 (12): 30-35/46 [Abstract] ( 84 ) HTMLNew PDF (12235 KB)  ( 61 )
36 State-of-Art Review on Ultrasonic Vibration-Assisted Laser Cladding
CHEN Jian, YAO Zhehe, YAO Jianhua, LIU Yan
DOI: 10.16080/j.issn1671-833x.2021.12.036
Ultrasonic vibration-assisted laser cladding (ULC), based on the advantages of efficient surface modification and forming of laser cladding, applies ultrasonic energy field to overcome the defects caused by rapid solidification. ULC has become a research hotspot at home and abroad. The research shows that after the application of ultrasonic vibration, the grains of the laser cladding layer are refined and equiaxed grains are able to be formed. Meanwhile, the microcracks and porosity defects are significantly inhibited, and the hardness, wear resistance and oxidation resistance are improved. Combined with the research results of our group in the field of ULC and considering the characteristics of ultrasonic vibration, the research status of ULC technology at home and abroad is reviewed. The principle of ULC technology, the ultrasonic vibration device and ultrasonic applying mode in ULC technology, the microstructure characteristics and performance of ULC cladding layer are analyzed emphatically. Furthermore, the application of ULC technology is prospected.
2021 Vol. 64 (12): 36-46 [Abstract] ( 173 ) HTMLNew PDF (55081 KB)  ( 117 )
47 Process Effect on Dynamic Response Behavior of Water Confining Layer in Laser Peening
ZHAO Nianyou, CHENG Han, HU Yongxiang
DOI: 10.16080/j.issn1671-833x.2021.12.047
It is important to research the dynamic response process of water confining layer under laser shock to improve the stability and reliability of shock effect. By establishing the experimental system for observing the dynamic response process of water confining layer under laser shock, the influence of pulse energy and water pressure on dynamic response time and shock effect are analyzed. The results show that a stable water film is formed on the workpiece surface by the cylindrical jet. Under the action of high energy laser-induced plasma shock wave, water confining layer bursts and produces a lot of water mist. And then under the action of continuous jet, water confining layer quickly recovers and water mist gradually dissipates. Pulse energy and water pressure have minor effect on the dynamic response time of water confining layer and shock effect. The recovery time of water confining layer range from 4 milliseconds to 18 milliseconds and water mist lasts for 30–50 milliseconds. By adjusting the process conditions reasonably, the maximum output frequency of the laser can reach 20Hz.
2021 Vol. 64 (12): 47-52/69 [Abstract] ( 94 ) HTMLNew PDF (11258 KB)  ( 56 )
53 Microstructures and Properties of TiC Reinforced Ni–30Fe–20Al Composite Prepared by Laser Cladding
LIU Yufan, JIAO Junke,XU Zifa,OUYANG Wentai,ZHANG Mina,LIU Zheng,ZAN Shaoping,ZHANG Wenwu
DOI: 10.16080/j.issn1671-833x.2021.12.053
The TiC reinforced Ni–30Fe–20Al composite layer with different TiC mass fractions (0, 10% and 20%) was prepared on the stainless steel by laser cladding technology using fiber laser cladding system to investigate the microstructure and mechanical properties and the influence of the TiC content on the composite properties. The macro-morphology, microstructure, phase and micro-hardness of the composites were characterized. The results show that the cladding layer has a good metallurgical combination with the substrate. Most of the TiC particles existed as the TiC compounds, which distributed uniformly in the cladding layer. Some TiC particles remelting formed new phases with different atomic ratios, which further improved the hardness of cladding layer. With the increase of the proportion of TiC powder, the hardness of the cladding layer increases.
2021 Vol. 64 (12): 53-60 [Abstract] ( 67 ) HTMLNew PDF (47764 KB)  ( 71 )
61 Application of Instability Numerical Model in Preparation of Grid Structure by Laser Welding
ZHANG Jingqi, LIN Jian,LEI Yongping,XIAO Rongshi,LI Long,SONG Zheng
DOI: 10.16080/j.issn1671-833x.2021.12.061
Based on the numerical analysis theory of laser welding instability of thin plate, the simulation model of external instability deformation of rectangular grid structure was established by extracting the inherent strain distribution of ultra-thin plate cross structure after laser spot welding. The first positive eigenvalue buckling mode of the cross joint was calculated, which was shown as deflection deformation.With the increase of heat input, the out-of-plane deformation of the joint increases obviously, and the deflection direction changes. Based on the eigenvalue buckling deformation analysis of the grid structure under two kinds of welding sequence, it was found that there is an obvious downward deviation at the joint of the first thin plate under the condition of welding sequence 1, and the deformation deflection was 27μm. Under the welding sequence 2, the buckling eigenvalue of the thin plate was smaller, and the overall deflection of the thin plate increased. With the increase of the number of solder joints, the instability deformation is more likely to occur, which is shown by the continuous decrease of the buckling characteristic value of the thin plate. The coupling of buckling deformation near the solder joint will significantly increase the out-of-plane deformation of the grid structure in the middle layer compared with the top and bottom areas.
2021 Vol. 64 (12): 61-69 [Abstract] ( 99 ) HTMLNew PDF (19114 KB)  ( 61 )
       APPROACHING SCIENCE
70 Persevere for Technology Innovation and Firmly Promote the Transformation of Achievements
2021 Vol. 64 (12): 70-71 [Abstract] ( 79 ) HTMLNew PDF (651 KB)  ( 41 )
       RESEARCH
72 Process Design of Hollow Centrifugal Impeller Based on Additive–Subtractive Hybrid Manufacturing
GAO Kai, WANG Zhenzhong, KONG Liuwei, KONG Yangbo, HOU Liang
DOI: 10.16080/j.issn1671-833x.2021.12.072
When the main components meet the performance requirements, weight reduction is of positive significance to increase the thrust-to-weight ratio of small turbojet engines. Analyzing the space structure of the small turbojet engine, choosing the integral impeller for lightweight design, and giving a preliminary hollow structure plan. Based on the additive–subtractive hybrid manufacturing, this paper designed the complete process and testing plan of the hollow centrifugal impeller, using Powermill software to verify the process and optimize the additive–subtractive hybrid manufacturing. The feasibility of the overall process is verified through the additive–subtractive hybrid manufacturing, and the machining accuracy of the hollow centrifugal impeller is inspected to verify the machining accuracy. The application of the additive–subtractive hybrid manufacturing has positive significance for the process design of complex structures.
2021 Vol. 64 (12): 72-79/84 [Abstract] ( 112 ) HTMLNew PDF (5218 KB)  ( 582 )
80 Orthogonal Experimental Study on Creep Aging Behavior of 7055T7751 Aluminum Alloy
SHI Jianmeng, LI Binliang, ZHANG Haibao
DOI: 10.16080/j.issn1671-833x.2021.12.080
This paper presents an orthogonal experimental design on the creep aging test for 7055T7751 aluminum alloy by uniaxial stretch. An empirical formula on calculating the yield strength from the prestress, aging temperature and aging duration after creep aging is obtained by analyzing the experimental results using the orthogonal polynomial regression method. In addition, the effects of the three process parameters on the yield strength of 7055T7751 aluminum alloy after creep aging are investigated
2021 Vol. 64 (12): 80-84 [Abstract] ( 111 ) HTMLNew PDF (1098 KB)  ( 219 )
85 Experimental Research on Mechanical Properties of Titanium Alloy Bolt Under Tension–Shear Combined Load
GAO Xuemin, YAN Lu,HE Yamei,FENG Derong, FENG Shaowei
DOI: 10.16080/j.issn1671-833x.2021.12.085
A testing device for tension–shear combined load was processed, and mechanical properties tests were carried out under pure tension, pure shear, tension–shear combined load. The influence of tensile stress and bolt axis angle on the test results and the corresponding variation law were analyzed. The results show that the mechanical properties of titanium alloy bolts under the tensile and shear combined load are obviously lower than those under pure tensile load, with a maximum decrease of 40%.
2021 Vol. 64 (12): 85-89 [Abstract] ( 108 ) HTMLNew PDF (1602 KB)  ( 206 )
90 Simulation and POD Analysis of Eddy Current Detection of Coated Blade Based on CIVA
ZHANG Haibing,WANG Shitao,SHAN Borong
DOI: 10.16080/j.issn1671-833x.2021.12.090
Aero-engine blades are usually coated on the surface of their parts in manufacture to prolong the engine life. This paper simulates the typical fatigue cracking damage of certain engine blades, uses the CIVA simulation technology to conduct the eddy current detection simulation test to verify the effect of coating on eddy current detection. Using the method of numerical simulation, taking the defect depth as a characteristic parameter and the thickness of the coating as the uncertainty, the POD analysis is carried out. The influence and measures of eddy current lift–off effect and the skin effect on detection reliability are studied to further verify the feasibility and reliability of eddy current testing technology in the detection of coated blade defects.
2021 Vol. 64 (12): 90-93/101 [Abstract] ( 91 ) HTMLNew PDF (1508 KB)  ( 186 )
94 Evaluation of Uncertainty in Blade Parameter Measurement Based on Monte Carlo Method
ZHANG Xueyi, HE Xiaomei, LIU Junfeng, WANG Zhuoran, WANG Yizhang
DOI: 10.16080/j.issn1671-833x.2021.12.094
To study the uncertainty evaluation of various parameter errors in the actual measurement results of blades is necessary, due to the blade profile parameters have an important influence on the aerodynamic performance of the engine. Blade quality inspection based on CMM runs through the whole process of blade manufacturing. However, due to the complexity of blade measurement evaluation process and the diversity of parameter evaluation, it is difficult to evaluate the uncertainty of blade measurement results. In this paper, Monte Carlo method is used to build the model and simulate the measurement uncertainty of four typical blade profile parameters, and the uncertainty is compared with the traditional GUM method. The analysis and comparison results verify the correctness of the uncertainty analysis method of blade measurement in this paper, which is conducive to realize the on-line evaluation of measurement uncertainty of blade profile parameters, and is worthy of promotion and application.
2021 Vol. 64 (12): 94-101 [Abstract] ( 126 ) HTMLNew PDF (1217 KB)  ( 485 )
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· 'Aeronautical Manufacturing technology ' is included in EI database
· China Science Citation Database (CSCD)
· Chinese S&T Journal Citation Reports (CJCR)
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· 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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