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2017 Vol. 60, No. 13
Published: 2017-07-01
FEATURE
FORUM
NEW VIEWPOINT
RESEARCH
C0NTENTS
COVER STORY
 
       C0NTENTS
6 C0NTENTS
2017 Vol. 60 (13): 6-10 [Abstract] ( 100 ) HTMLNew PDF (2636 KB)  ( 449 )
       FEATURE
16 Numerical Simulation on Laser Additive Manufacturing Process for Metal Components
WEI Lei1,2, LIN Xin1,2, WANG Meng1,2, MA Liang1,2, HUANG Weidong1,2, HOU Yun’an3
DOI: 10.16080/j.issn1671-833x.2017.13.016
During the laser additive manufacturing of metal components, the thermal/mechanical cycles cause the
deformation of the part. The pore and unmelted metal powder reduce the tensile and fatigue properties. The solidification microstructure,
especially the columnar to equiaxed transition (CET), determines the properties of final products. In view of the
above three aspects, this study reviews the developments of the numerical simulating of laser additive manufacturing for metal
components. The current researches and exist problems have been reviewed. And the numerical models used in the simulations
have been discussed, including the finite element method (FEM) for thermal/mechanical problems, computational fluid dynamics
(CFD) for the liquid metal flow in the molten pool and the numerical models (phase field (PF) and cellular automaton
(CA)) for the solidification of microstructure. On the basis of this, the prospect and trend of the numerical simulation of the
laser additive manufacturing for metal components are discussed.
2017 Vol. 60 (13): 16-25 [Abstract] ( 430 ) HTMLNew PDF (4622 KB)  ( 2356 )
       COVER STORY
28 Development of Anti-Fatigue Surface Modification Technology of Aeronautical Titanium Alloy
YANG Shengqiang1,2, LI Yonggang1,2, LI Wenhui1,2
DOI: 10.16080/j.issn1671-833x.2017.13.028
The latest research progress of surface modification technology for improving the fatigue properties of titanium
alloys is introduced. This paper sums up the processing ability and mechanism of different processing methods for
titanium alloy, such as shot peening, laser shock peening, extrusion or expansion, rolling or roller burnishing, ion implantation
and barrel finishing. The residual stress level and fatigue performance of the machined parts are described.
2017 Vol. 60 (13): 28-35 [Abstract] ( 222 ) HTMLNew PDF (2461 KB)  ( 773 )
       FORUM
38 Research on Fatigue Life of Aluminum Alloy With Fastener Hole by Laser Shock Processing
ZHAO Yong1, JIANG Yinfang2, PENG Taotao2, WAN Quanhong1
DOI: 10.16080/j.issn1671-833x.2017.13.038
The effect on fatigue life and fracture morphology of 7050-T7451 aluminum alloy hole by laser shock
processing (LSP) was investigated. ABAQUS was used to study the stress distribution of hole wall path and surface path
of the hole under different peak pressures. The LSP test and the fatigue tensile test were carried out based on the simulation
results. The results show that laser double-sided shock processing on the sides of the sheet forms a depth of residual compressive
stress layer, and in the center forms a range of residual tensile stress layer, which is also the main reason for the
transfer of fatigue source froms the hole angle to center of the hole wall. Under the stress level of 165.8MPa, 195.0MPa and
275.4MPa, the fatigue life of the samples increased by 451%, 216% and 116% respectively. After LSP, the fatigue source
position of the sample is transferred from the hole angle to the inside of the pore wall, and the area of fatigue crack area is
obviously increased. The research show that LSP can obviously improve the fatigue properties of the aluminum alloy with
fastener hole, but the strengthening effect decreases with the increase of the external load.
2017 Vol. 60 (13): 38-43 [Abstract] ( 237 ) HTMLNew PDF (3198 KB)  ( 441 )
44 Investigation on the Fretting Wear of Ti-6Al-4V Alloy Treated With Wet Peening
ZHANG Xinhua1,2,3, FU Xuesong4, GAI Pengtao1,2,3, LI Ruidong4, LI Kang4
DOI: 10.16080/j.issn1671-833x.2017.13.044
Wet peening was taken on Ti-6Al-4V titanium alloy as a surface strengthening treatment. Effect of shot
peening on fretting wear behavior was investigated under different conditions of partial slip, mixed slip and gross slip. The
fretting wear experiment indicates that wet peening has little influence on fretting wear behavior of Ti-6Al-4V titanium
alloy at condition of gross slip. However, wet peening can inhibit crack initiation occurred in accumulation of plastic deformation
zone when the condition is partial slip. It is suggested that the improvement of local yield strength at surface layer
by shot peening was the key reason for avoiding local fatigue damage.
2017 Vol. 60 (13): 44-47 [Abstract] ( 269 ) HTMLNew PDF (2159 KB)  ( 556 )
48 Effect of Shot Peening on Fatigue Performance Stress-Concentration Sensitivity of FGH96 Powder Metallurgy Superalloy
WANG Xin1,2, HU Yunhui3, WANG Xiaofeng4,5, TANG Zhihui1,2, ZOU Jinwen4,5
DOI: 10.16080/j.issn1671-833x.2017.13.048

Ceramic shot peening using different intensities was applied on grinded surface of FGH96 powder metallurgy
superalloy to research its effect on fatigue performance stress-concentration sensitivity. The fatigue tests and surface
integrity statues were characterized. The results show that fatigue limit of grinding declines from 583MPa to 465MPa at
650 ℃ when the stress concentration factor increases from Kt=1 to Kt=1.7. Shot peening using high intensity makes the
Kt=1.7 fatigue limit edge up to 530MPa while low intensity has no gain for the Kt=1.7 fatigue limit. High intensity leads to
the elimination of grinding marks, an increscent average roughness and an 100μm-depth residual stress profile, therefore
the 600MPa fatigue cracks are initiated at the subsurface in a single source fatigue model. By contrast, low intensity hardly
makes marks eliminated and the fatigue cracks are initiated at the surface in multiple sources fatigue model. The research
proves that the suitable shot peening method can minish the weaken effect to fatigue performance by structural stress-concentration.
2017 Vol. 60 (13): 48-53 [Abstract] ( 260 ) HTMLNew PDF (2430 KB)  ( 654 )
54 Effect of Mo Content on Microstructure and Mechanical Property of Mo-Ni-B Surfacing Alloy
WEN Yongce1,2, SUN Junsheng1,2, JIAO Enli1, LI Zhengjie1,2, ZHAO Leping1
DOI: 10.16080/j.issn1671-833x.2017.13.054
New alloy powder blocks with Mo-Ni-B system were designed. Ni-based ternary boride deposited alloys
were fabricated on Q235 steel substrates using argon arc welding process. Effect of Mo content on microstructure, phase, hardness,
wear resistance and corrosion resistance of ternary boride deposited alloy was studied. The results show that the deposited
metals consisted of ternary boride phases, such as Mo2M’B2, MoNi4, Mo5(B、Si)3, γ-（Fe，Ni，Mo，Cr）, etc. Besides, Mo
content has a great influence on the microstructure of deposited metals. In this study, the alloy with 44.18% Mo content has the
best corrosion resistance and the wear resistance of alloy with 37.53% Mo content is 27.7 times higher than Q235 steel.
2017 Vol. 60 (13): 54-59 [Abstract] ( 219 ) HTMLNew PDF (2090 KB)  ( 487 )
       NEW VIEWPOINT
60 Extraction of Feature Point From Scattered Points in Complex Curved Part
GAO Rui1, LI Shuanggao1, HUANG Xiang1, LI Dong2
DOI: 10.16080/j.issn1671-833x.2017.13.060
Geometrical feature extraction of complex curved parts is of great significance to the detection of machining
quality and the reverse reconstruction of CAD model. A method for extracting feature points from scattered points
of complex surface parts is proposed in this paper. Firstly, a method of neighborhood principal component analysis based
on Gauss weight is proposed, estimating the degree of local change of each point neighborhood to initialize labels. Subsequently,
feature points are extracted by automatic recognition based on labels. Finally, the anomaly points of the feature
points are removed by the method of feature points clustering. The algorithm directly operates on scattered point clouds,
without any topological connection information. The experimental results show that the algorithm is simple and effective,
without too much manual adjustment parameters, and the extracted feature points are complete.
2017 Vol. 60 (13): 60-65 [Abstract] ( 273 ) HTMLNew PDF (2248 KB)  ( 482 )
       RESEARCH
66 Effect of Welding Process on Fiber Laser Welding of 2A97T3 Al-Li Alloy
YI Zhen1,2, CHEN Li 2, HE Enguang 2, CHANG Ming 1
DOI: 10.16080/j.issn1671-833x.2017.13.066
Effects of the welding process on fiber laser welding of 1.2mm 2A97T3 Al-Li alloy are studied through
a lot experiments. The results show that with the increase of the welding heat input, the welding bead width and the backtop
width ratio will be improved. Moreover, the variation of the back side bead width is significant, while the top side bead
width has small changes. Too much heat input will lead to decrease of welding bead width due to the collapse of welding
seam. The welding process parameters will be much more narrow when laser power and welding speed increasing. Under
the condition of the same welding linear energy, welding forming of high speed is better. The hardness of laser thermal conducting
welding is obviously higher than that of laser deep penetration welding.
2017 Vol. 60 (13): 66-71 [Abstract] ( 219 ) HTMLNew PDF (2343 KB)  ( 419 )
72 Research Progress of Manufacturing Composite Fuselage Frame
HAN Xiaoyong, SU Jiazhi, CHEN Ping, LIU Weiping, GAO Longfei
DOI: 10.16080/j.issn1671-833x.2017.13.072
Five processes (UD+AFP+Automated rolling/AFP+Hot drape forming/Braiding prepreg/Braiding
preform+LCM/NCF prefrom+LCM) for manufacturing composite fuselage frames are introduced. It describes the technical
detail, advantage and disadvantage and application of each process, development tendency, finally compares these processes
from mechanical efficiency, productivity and overall cost to provide process proposals for manufacturing composite
fuselage frames.
2017 Vol. 60 (13): 72-76 [Abstract] ( 419 ) HTMLNew PDF (3633 KB)  ( 775 )
77 Research Progress of Metal Doped Diamond-Like Carbon Films
ZHANG Shujiao, WU Yanxia, ZHU Li’nan, TANG Bin, WANG Zhifeng, ZHOU Bing
DOI: 10.16080/j.issn1671-833x.2017.13.077
Diamond-like carbon (DLC) films have attracted more and more attention due to their promising mechanical
and tribological properties. However, there are some problems in DLC films such as high internal stress, low thermal
stability, which restrict the further application and development of DLC films. Moderate metal doped in the DLC films can
form nanocrystallines or MeC nanoparticles in the matrix, which depend on the bonding mode between metal and carbon.
Those particles with high activity increase the grain boundary slip and change the structure of films, which in turn improve
the mechanical and tribological performance of DLC films, and thus provide a new idea for the application and development
of the film. Current research progress of the metal doped DLC films is summarized and the development trend of
those films in the future is put forward.
2017 Vol. 60 (13): 77-82 [Abstract] ( 184 ) HTMLNew PDF (1942 KB)  ( 956 )
83 Processing Property of Liquid Polycarbosilane Precursor on Preparation of Ceramic Composites
ZHANG Bingyu, YANG Jinhua, WANG Ling
DOI: 10.16080/j.issn1671-833x.2017.13.083
Ceramic precursor plays an important role in preparing ceramic matrix composites through PIP （Precursor
Infiltration and Pyrolysis） method. The properties of precursors have decisive influence on manufacturing process and
properties of the composites. A new liquid ceramic precursor VHPCS and its ceramic products were investigated by infrared
spectrometry, differential scanning calorimetry, thermal gravimetric analysis and X-ray diffraction. Also, the curing
and pyrolysis behavior of VHPCS had been discussed. Results showed that VHPCS contained both Si-H and Si-CH=CH2
reactive groups, and it could be cured above 165℃ . The ceramic yield of VHPCS at 1000℃ in nitrogen atmosphere was
60% and the pyrolysed products showed well crystal-structure stability in the temperature range of 1000-1300℃ . Results
showed that VHPCS could be a promising precursor for PIP method.
2017 Vol. 60 (13): 83-88 [Abstract] ( 219 ) HTMLNew PDF (1342 KB)  ( 488 )
89 Effect of Heat Treatment on Microstructure and Mechanical Property of Laser Deposited A-100 Steel
CUI Can1, LIU Dong2, SU Yadong1, WU Bin1, WANG Xiangming1
DOI: 10.16080/j.issn1671-833x.2017.13.089
The microstructure of the deposited material and laser deposited A-100 steel got by adjusting heat treatment
methods were studied. The results show that the mixed martensite-bainite microstructure specimens have a high tensile
strength with a low plasticity compared with the quenched martensite microstructure specimens after different heat treatment.
2017 Vol. 60 (13): 89-92 [Abstract] ( 197 ) HTMLNew PDF (1614 KB)  ( 383 )
93 Structure Design and Test Technology of Electric General Aircraft With Composite Materials
GU Chao, HUANG Jun, YANG Fengtian
DOI: 10.16080/j.issn1671-833x.2017.013.093
In order to design and manufacture a lightweight, simple technology and affordable electric general
aircraft, a new method of composite structure design and verification is adopted. After analyzing the load transfer of the
aircraft, the model of the aircraft structure is built by CATIA and the strength of the aircraft structure is calculated by PATRAN/
NASTRAN. Based on the calculation, the composite layer design is optimized, and the drawings in two dimensions
are issued quickly. With a series of mechanical tests for the composite aircraft components and the aircraft, a test verification
method for fast testing the structure of light sport aircraft is formed. According to the characteristics of parts with different
types, different manufacturing processes are adopted, so that the production costs and cycle are controlled effectively.
The effectiveness of the results and the test data are proven on RX1E (Rui Xiang) aircraft with the satisfaction of the design
requirements.
2017 Vol. 60 (13): 93-99 [Abstract] ( 283 ) HTMLNew PDF (2079 KB)  ( 641 )
100 Research on Measuring Method of Thread Parameters Based on Thread Integrated Scanner
LIU Pan
DOI: 10.16080/j.issn1671-833x.2017.13.100
The quality and performance of the airspace thread directly affects the safety of the aircraft, so the precise
measurement of the thread parameters is very important. The optimal measurement method using the thread integrated
scanner is determined by comparing the advantages and disadvantages of several traditional measurement methods. This
method has the advantages of reliable accuracy, complete parameters and high efficiency. In addition, the measuring principle
of the method using thread integrated scanner is introduced, and error analysis is carried out. Finally, the reliability
of the method is verified by comparing the results of several different measuring methods on the same thread and doing repeatability
and stability test.
2017 Vol. 60 (13): 100-104 [Abstract] ( 235 ) HTMLNew PDF (1202 KB)  ( 496 )
105 Design of Spherical Reamer for Machining Aviation Piston Pump
DU Yulian
DOI: 10.16080/j.issn1671-833x.2017.13.105
In domestic, the quality of plunger hole in aviation piston pump is quite poor and the production efficiency
is quite low at present. In order to solve those problems, spherical reamer is put forward after studying foreign similar products
processing experience. Based on well centered spherical center, the stress could be well distributed and the resistance
could be well reduced, and this research improved the traditional structure of reamer. By adjusting its shape, size, material,
wear resistance etc, new structure design of reamer is developed. Compared with the existing processing way, spherical
reamer can evidently improve the cylindricity and surface roughness. Meanwhile, the process of producing plunger hole
with spherical reamer is more economical and practical.
2017 Vol. 60 (13): 105-109 [Abstract] ( 272 ) HTMLNew PDF (1362 KB)  ( 333 )
  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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