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2020 Vol. 63, No. 12
Published: 2020-06-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Research Status and Application Progress of Laser Shot Peening Surface Strengthening Technology
YANG Qi, FU Xuesong,ZHOU Wenlong
DOI: 10.16080/j.issn1671-833x.2020.12.014

Laser shot peening is a new technique for surface modification using shock wave pressure induced by the interaction between pulsed laser and materials. The material surface integrity could be changed effectively by reasonable process parameters controlling, which is beneficial to promoting the material wear resistance, corrosion resistance as well as the fatigue property and significantly improving the service life of engineering components. In this paper, the technical principle, technological characteristics and development history of laser shot peening are introduced. The research progress in related fields at home and abroad are reviewed. The main application directions of laser shot peening technology are summarized. The follow up research is prospected.
2020 Vol. 63 (12): 14-22 [Abstract] ( 268 ) HTMLNew PDF (15341 KB)  ( 148 )
       COVER STORY
24 Research on Construction Technology of Intelligent Lean Production Line of MA Aircraft
YANG Guorong, LAI Yunfeng, XIE Ansheng, ZHANG Qi
DOI: 10.16080/j.issn1671-833x.2020.12.024
According to the characteristics and development trend of aircraft assembly line, this paper expounds the connotation and intelligent characteristics of aircraft intelligent lean production line, puts forward the construction structure of aircraft assembly line and the basic components of each system. This paper introduces the overall demand and general process of lean construction of domestic vortex propeller regional aircraft in Modern Ark, and describes the key application technologies and relevant practical applications in the process of building intelligent lean production line. The importance of lean production in production line construction is proven by practice and application.
2020 Vol. 63 (12): 24-30 [Abstract] ( 205 ) HTMLNew PDF (10853 KB)  ( 148 )
       FORUM
34 Gradient Microstructure and Thermal Stability of TC17 Titanium Alloy Induced by Laser Shock Peening
YANG Yang, ZHANG Hua
DOI: 10.16080/j.issn1671-833x.2020.12.034
The gradient microstructure and its thermal stability of TC17 titanium alloy induced by ultra high strain rate deformation of LSP were systemically examined by transmission electron microscope (TEM). The microstructure near substrate consisted of high density deformation twins and dislocations; The microstructures featured of high density dislocation tangles, dislocation cells and subgrains closer to the surface and deformation twins became less prevalent due to the higher strain and strain rate which led to insufficient time for atoms to reposition to the twinned orientation to accomplish the twinning deformation; The original coarse grains with size of tens of micrometers (average grain-size 43μm) were refined instantly to hundreds of nanometers (average grain-size 396nm) in the top surface of TC17 titanium alloy after LSP. The quantitative calculation of recrystallization kinetics proved that the instant grain refinement of TC17 titanium alloy after LSP was the result of rotation dynamic recrystallization (RDR) mechanism. The LSPed TC17 titanium alloy samples were annealed at 573K, 623K, 673K, and 723K for 1h, respectively. Comparison of the gradient microstructures studied at different depths of the LSPed and LSP+573K/1h and LSP+673K/1h annealed specimens indicated that the dislocation density clearly decreased and the dislocation cells became clearer in the 573K/1h annealed specimen while there were no great changes in deformation twin density and the average grain size at the surface did not change greatly. After annealing at 673K for 1h, the dislocation density and deformation twins density both decreased greatly at different depths and the average grain size at the surface increased compared to those of the LSPed and 573K/1h annealed specimens. The average grain-sizes in the top surface layers of the LSPed and 573K/1h, 623K/1h, 673K/1h, and 723K/1h annealed samples were 396nm, 422nm, 493nm, 1.04μm, and 2.46μm, respectively. The critical temperature at which the microstructures of the LSPed TC17 titanium alloy changed significantly was 673K; The fine gains at the top surface began to grow abnormally when the annealing temperature exceeds that temperature. There was a gradient distribution of hardness values of the LSPed surface layer. The hardness values decreased significantly when the annealing temperature reached 673K. It can be concluded that 673K was the critical temperature below which the microstructures induced by LSP were thermally stable in the TC17 titanium alloy.
2020 Vol. 63 (12): 34-45 [Abstract] ( 151 ) HTMLNew PDF (35176 KB)  ( 93 )
46 Strengthening Mechanism of Shot-Peening on Medium-Temperature Fatigue Property of Single-Crystal Superalloy
WANG Xin, XU Chunling, LIU Chenguang,TANG Zhihui, ZHAO Zhenye
DOI: 10.16080/j.issn1671-833x.2020.12.046

Ceramic shot were employed to shot-peen the single-crystal superalloy (SX) to analyze the strengthening mechanism of medium-temperature fatigue property. Surface morphology, cross-sectional micro-structure, casting porosities and 650℃ rotating-bending fatigue property were researched, and the fatigue fractures were observed. The results show the 650℃/Kt =1.7 and 650℃/Kt =3 rotating-bending fatigue limit increase by 21.3% and 12.7% after shot peening respectively. Firstly, shot peening eliminated sharp machining masks at the bottom and formed a smooth crater, which reduced the surface stress concentration factor from 1.44 to 1.38. This is the surface topography optimization mechanism. Secondly, a gradient plastic deformation layers were formed at the surface by shot peening, composed of the severe deformation layer at the outer-surface, the deformation layer with the “line structure” at the subsurface, the small deformation layer at the inferior surface and the matrix. The micro-hardness of the deformation layer was 42% higher than that of the matrix, which is the deformation strengthening mechanism. Furthermore, the as-received casting porosities with the diameter 2–10μm, could be the fatigue crack source during alternating stress. The micro-holes closed at the outer-surface and ovalized at the subsurface and inferior surface after at shot peening, which reduced the stress concentration at the casting porosities. The deformation effect on the casting micro-holes of shot peening is the third strengthening mechanism..
2020 Vol. 63 (12): 46-52 [Abstract] ( 133 ) HTMLNew PDF (18920 KB)  ( 101 )
53 Multiscale FEM Simulation Technology of Laser Peen Forming
Lü Jiayang,WANG Yongjun,WANG Junbiao,GAO Guoqiang, WANG Qiang
DOI: 10.16080/j.issn1671-833x.2020.12.053
As an advanced metal plastic forming and surface treatment process, laser peen technology has a broad application prospect in aerospace industry. The energy density of laser shock is stronger than that of shot peening, which enables LSP to form sheet metal with larger stiffness, such as integrated panels on airplane. In this research, a multiscale FEM simulation method of laser peen forming (LPF) was established to calculate the laser induced stress field and to predict the deformed curvature of workpieces. The prediction results have been verified through LSP experiments on square 2024–T351 block test pieces and typical H-shaped beams, which proves the simulation method is effective.
2020 Vol. 63 (12): 53-59 [Abstract] ( 147 ) HTMLNew PDF (14137 KB)  ( 74 )
60 Numerical Study on Surface Integrity of Shot-Peened Aluminum
WANG Cheng, ZHOU Zechen, YANG Jichong
DOI: 10.16080/j.issn1671-833x.2020.12.060
The surface integrity of shot-peened aluminum was numerically studied. A new finite element model of shot peening was developed, in which the indentations produced by multiple shot impacts are distributed uniformly on a circle within the shot-peened surface. The shot peening coverage was calculated by creating a circular path. Under the different shot peening coverage, the circular path-distributed surface morphology, roughness, residual stress, work hardening and grain refinement were investigated. The results show that, with the increase of shot peening coverage, the surface roughness, residual compressive stress, work hardening degree and grain-refinement degree increase, but the increments gradually decrease and present the saturate tendency after exceeding the full coverage, which are in accord with the evolution of surface equivalent plastic strain induced by multiple shot impacts.
2020 Vol. 63 (12): 60-66 [Abstract] ( 110 ) HTMLNew PDF (5416 KB)  ( 226 )
       APPROACHING SCIENCE
68 Independent Innovation, Courage to Surpass, Assistance to the Pillars of a Great Power
2020 Vol. 63 (12): 68-69 [Abstract] ( 107 ) HTMLNew PDF (1412 KB)  ( 316 )
       RESEARCH
70 Design and Optimization of Longitude-Bend Complex Mode Elliptical Vibration Assisted Drilling Device
WANG Xiaoxue, ZHANG Chen, WANG Shengcai
DOI: 10.16080/j.issn1671-833x.2020.12.070
 Longitude-bend elliptical vibration assisted drilling has significant advantages in reducing the cutting force and cutting heat of deep cavity machining and reducing the friction between the tool and the hole wall compared to other vibration forms. At present, in the design of the longitude-bend elliptical vibration assisted drilling device, due to the installation of the appurtenances such as the drilling tools, etc, the actual frequency and the design frequency of the longitude-bend elliptical vibration assisted drilling device are greatly different. At the same time, the longitudinal vibration and the bending vibration cannot obtain the same frequency resonance mode. For this reason, this paper studies the design and optimization methods of the longitude-bend elliptical vibration assisted drilling device. Firstly, according to the elliptical trajectory output requirements, the overall structural design of the longitude-bend device is carried out. Analytical method is used to design ultrasonic transducer and horn, and the initial three-dimensional model of longitude-bend elliptical vibration assisted drilling device is established. Establishing the kinematics modeling of longitude-bend elliptical vibration on the basis of the established three-dimensional model; Secondly, based on the principle that the longitude-bend resonant frequency is close to the target frequency, the influence of the tool and ER collet nut on the resonant frequency is reduced by equal mass method and simplified method, and the finite element analysis software ANSYS Workbench is used to control the variable. The method optimizes the longitude-bend elliptical vibration assisted drilling device; Finally, the structure size is determined according to the finite element optimization results, and the dynamic characteristics are analyzed. It is verified that the design and optimization method of the longitude-bend elliptical vibration assisted drilling device proposed in this paper can reduce the influence on the frequency of appurtenances such as the drilling tools, etc, the same resonant frequency of the longitude-bend elliptical vibration assisted drilling device is achieved
2020 Vol. 63 (12): 70-79 [Abstract] ( 149 ) HTMLNew PDF (4248 KB)  ( 219 )
80 Research on Bonding Technology of Aluminum Honeycomb Sandwich Panel Covered With Copper Wire Netting
WU Limin, YANG Yongzhong, PAN Xiaoli, LI Yalong, YU Zhongnan
DOI: 10.16080/j.issn1671-833x.2020.12.080
This paper focused on practical problems in manufacturing processes of aluminum honeycomb sandwich panel covered with copper wire netting. Improving folding process of copper wire netting, choosing suitable prepreg, adjusting heating rate, decreasing the diameter of copper wire netting and ameliorating folding means were used to reduce the impact on thermal expansion and to polish up bonding performance of copper netting and prepreg. Meanwhile, choosing suitable coating films and curing molding process of aluminum honeycomb sandwich panel was used in dry glass fabric to clasp layers and improve contraction in marginal areas of aluminum honeycomb sandwich. The practicability of the improvements was confirmed by the test of procession control panel and non-destructive test technology, which could give a reference for the manufacturing processes of aluminium honeycomb sandwich panel covered with copper wire netting.
2020 Vol. 63 (12): 80-86 [Abstract] ( 145 ) HTMLNew PDF (9301 KB)  ( 70 )
87 Various Influence on Locking Torque Descent Rate of GH738 Self-Locking Nut
SUN Jingdong, ZHENG Dongmei
DOI: 10.16080/j.issn1671-833x.2020.12.087
In order to study the influence of various factors on locking torque descent rate of GH738 self-locking nut, targeted improvement measurements and group tests were taken under the combined effect of three factors, namely, deformation form, thickness and deformation amount of lock area. The results show that the locking torque can be increased by adopting three-point deformation process, increasing the thickness and deformation amount of the lock area. For MJ8 nuts, after improvement the descent scale of locking torque decreases from 43.2% to 17.9%, but for MJ6 and below nuts, the descent rate of locking torque is susceptible to the variation of lock area thickness when adopting threepoint deformation process, which is unstable.
2020 Vol. 63 (12): 87-91.96 [Abstract] ( 121 ) HTMLNew PDF (1705 KB)  ( 185 )
92 Experimental Study on Corrosion Characteristics of Aluminum Alloy in Salt Spray Environment
CHENG Wenli, YANG Hui, REN Dejie,HE Erfeng,LI Yufeng
DOI: 10.16080/j.issn1671-833x.2020.12.092
The corrosion characteristics of 2124–T851 aluminum alloy samples under different performance treatment conditions in salt spray environment were studied by salt spray test. The surface corrosion state of the sample within 960h was recorded by photograph every 96h a cycle. The results show that the surface corrosion of aluminum alloy samples surface without treatment gradually increases with the increase of corrosion time, the sample with surface phosphoric acid anodized (PAA) and sprayed with primer has good corrosion resistance. By comparison, it was found that there was no corrosion point in the test of BR–127 and TB06–9, which shows that BR–127 and TB06–9 have good salt spray corrosion resistance.
2020 Vol. 63 (12): 92-96 [Abstract] ( 169 ) HTMLNew PDF (3196 KB)  ( 331 )
97 Parameters Setting and Waveform Analysis in Ultrasonic Inspection for Aviation Bolts
ZHANG Haibing,WEN Dehong
DOI: 10.16080/j.issn1671-833x.2020.12.097
The ultrasonic longitudinal wave method is an ideal method for in-situ bolt detection. In order to optimize the ultrasonic testing parameters and improve the reliability of in-service aviation bolt damage detection, the typical aviation bolts are selected as test specimens in this paper, the simulated crack defects were made at different positions, and various parameters were used to test the bolts. The influences of the wave forms and different parameters on the test results were analyzed, lower frequency and smaller chip size are better. At the same time, this paper analyzes the interference of deformation wave, and puts forward effective measures and countermeasures to improve the reliability of defect detection and the accuracy of defect wave discrimination.
2020 Vol. 63 (12): 97-101 [Abstract] ( 131 ) HTMLNew PDF (11325 KB)  ( 80 )
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