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2021 Vol. 64, No. 15
Published: 2021-08-01
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Research Progress on Formation and Control of Intermetallic Compounds in Laser Welding of Dissimilar Materials
LI Zhuoxin,ZHANG Dongni,YAN Qizhu,ZHANG Yu,HAN Yi,Erika Hodúlová,WEI Wei,LI Hong
DOI: 10.16080/j.issn1671-833x.2021.15.014
The research status of formation mechanism and control measures of intermetallic compounds in laser welding joints of Al/steel, Ti/steel, Mg/Al and NiTi SMA/SS are reviewed. The effects of different base metal compositions and different welding processes on intermetallic compounds in welded joints are compared and analyzed. Effective control of intermetallic compounds can be achieved by adding intermediate fillers, controlling heat input, and adopting hybrid welding processes, thereby optimizing welded joint structure and improving mechanical properties. The research progress of material computing in simulating and predicting the structure and performance of intermetallic compounds in laser welding joints of dissimilar metals is also reviewed.
2021 Vol. 64 (15): 14-23 [Abstract] ( 318 ) HTMLNew PDF (6339 KB)  ( 907 )
       COVER STORY
24 Prepreg Preparation and 3D Printing of Continuous Carbon Fiber Reinforced Nylon Composite
TIAN Xiaoyong, ZHANG Yayuan, LIU Tengfei, LI Dichen
DOI: 10.16080/j.issn1671-833x.2021.15.024
In order to improve the impregnation ability of resin to fiber in continuous fiber reinforced thermoplastic composites (CFRTPCs) 3D printing technology and realize good impregnation interface bonding performance, a new technology of continuous fiber reinforced thermoplastic composite pre-impregnation 3D printing was proposed. The 1K carbon fiber reinforced nylon (CCF/PA12) re–impregnation filament was prepared using the self-developed meltimpregnation fiber pretreatment equipment, and then used for the 3D printed composites as raw material. The effects of key process parameters during impregnation and 3D printing were studied. The results show that the ultimate tensile force and tensile strength for fully impregneted prepreg filaments are 118.2N and 813.9MPa respectively. When the scanning spacing is 1.5mm, the delamination thickness is 0.1mm, the tensile strength and modulus of 1K–CCF/PA12 composites are 558MPa and 56GPa respectively. The porosity of the composites measured by micro X–ray 3D imaging system is about 0.15%. The [0/45/90/–45]10 laminates improve the impact resistance and can achieve the peak load of about 4.63kN.
2021 Vol. 64 (15): 24-33 [Abstract] ( 210 ) HTMLNew PDF (41721 KB)  ( 135 )
       FORUM
36 Research on Preparation and Properties of Direct Ink Writing of Continuous Carbon Fiber Reinforced Silicon Carbide Ceramic Matrix Composites
LI Sai, SUI Yunong, MIAO Kai, LU Zhongliang, LI Dichen
DOI: 10.16080/j.issn1671-833x.2021.15.036
Continuous carbon fiber reinforced silicon carbide ceramic composites have the advantages of low density, high specific strength, high temperature resistance, etc., and have broad application prospects in high-tech fields such as nuclear energy and aerospace. Using direct ink writing technology, the continuous carbon fiber and silicon carbide ceramic matrix were simultaneously formed through the coaxial nozzle to realize the preparation of continuous fiber reinforced ceramic composite material and the control of its structure and performance. The effects of slurry solid content, extrusion flow, printing speed and printing layer thickness on the quality of direct ink writing green part were systematically studied, and it was characterized by XRD, SEM and mechanical properties testing methods. The results show that adding short carbon fibers to silicon carbide slurry can further improve the strength and toughness of continuous fiber toughened silicon carbide composites. The polymer infiltration and pyrolysis can reduce the fiber monofilament gap, so that the bending strength of the composite material can reach 146MPa, and the fracture toughness reaches 3.77MPa · m1/2. The research results of this paper provide experimental basis for the rapid manufacturing of continuous carbon fiber reinforced silicon carbide ceramic composite parts in the future.
2021 Vol. 64 (15): 36-41/51 [Abstract] ( 179 ) HTMLNew PDF (26797 KB)  ( 128 )
42 Laser Sintered–Mechanical Nanocomposites With High Energy Absorption
YUAN Shangqin,WANG Zhihao,LI Jiang,ZHU Jihong
DOI: 10.16080/j.issn1671-833x.2021.15.042
An approach is proposed for creating 3D metamaterials of auxetic composite lattices via laser-sintering of carbon nanotubes reinforced nanocomposites, which provides a platform for the design and manufacturing of systems with programmable energy absorption capability. The optimization of constituent material and structural design enables the improvement of energy absorption performance across multiple scales. The energy absorption capacity of auxetic metamaterials is exponentially scaled with the relative density with the order of 2.5–3. The rationally topologized auxetic metamaterials exhibit a combination of high specific densification strength, ultrahigh energy absorption capacity (6.29MJ/m3 ), and excellent specific energy absorption (20.42J/g). Impressively, this group of auxetic metamaterials possesses the advantageous energy absorption capacity approaching that of titanium alloy foams as well as over a broad range of materials including plastic foams, aluminum alloy foams, and other 3D–printed lightweight structures.
2021 Vol. 64 (15): 42-51 [Abstract] ( 156 ) HTMLNew PDF (21780 KB)  ( 117 )
52 Study on Mechanical Properties of Polyetheretherketone/Tantalum/Niobium Lattices Made by High Temperature–Selective Laser Sintering
CAI Haosong,CHEN Peng,SU Jin,WANG Mingzhe,WANG Haoze,YAN Chunze, WANG Wei,SHI Yusheng
DOI: 10.16080/j.issn1671-833x.2021.15.052
Polyetheretherketone (PEEK) has high heat resistance and excellent mechanical properties, suitable for the applications in high temperature environment of aviation. Light lattice structures can be produced by additive manufacturing (AM) to replace the conventional solid structure and realize the lightweight of aviation parts. Therefore, in this paper, the PEEK/Ta/Nb composite powders are prepared, and the triply periodic minimal surface (TPMS) gyroid lattice structures of PEEK/Ta/Nb were fabricated by high temperature–selective laser sintering (HT–SLS) additive manufacturing technique. The compressive properties of composite lattice structures were studied and the fracture mechanism was clarified. The results show that gradient gyroid lattice structure allows smooth transition at the cell junctions, but the stress concentrates at the inclined bar of large porosity, which can lead to a layerwise collapses at a 45° fracture direction. The yield strength of PEEK/Ta, PEEK/Nb and PEEK/Ta/Nb is increased by 23.5%, 6.7% and 44.5% respectively compared with that of PEEK (1.19 MPa).
2021 Vol. 64 (15): 52-57/65 [Abstract] ( 162 ) HTMLNew PDF (45480 KB)  ( 86 )
58 Performance and Applications of 3D Printed Continuous Fiber-Reinforced Thermosetting Composites
MING Yueke, WANG Ben, ZHOU Jin, XIN Zhibo, LI Ting,WANG Feng,DUAN Yugang
DOI: 10.16080/j.issn1671-833x.2021.15.058
The development status and technical bottlenecks of 3D printed continuous fiber-reinforced thermosetting composites were reviewed in this paper. Based on the preliminary experimental research, a two-step 3D printing solution was proposed, including fiber impregnation and printing, and post-curing. The continuous carbon fiber (CCF) reinforced thermosetting epoxy (EP) samples were prepared by 3D printing. The mechanical test results show that the tensile strength and modulus of 3D printed CCF/EP samples were (1257±71) MPa and (96±11) GPa, respectively; the flexural strength and modulus were (965±80) MPa and (75±7) GPa, respectively; the interlaminar shear strength was (92±3) MPa. The microscopic fiber-resin bonding, distribution, and internal void defects were also discussed. Furthermore, complex structures reinforced by different fibers were fabricated to demonstrate the feasibility and generality of the proposed technique. Finally, the application prospect of 3D printed CCF/EP mesh in the field of self-heating and deicing was explored. These results pave the way for the digital manufacturing of high-performance thermosetting composites through 3D printing and demonstrate their great potential in advanced industrial applications.
2021 Vol. 64 (15): 58-65 [Abstract] ( 238 ) HTMLNew PDF (17059 KB)  ( 125 )
       APPROACHING SCIENCE
66 Focus on Materials Processing and Die & Mould Technology Problems and Committed to Key Technology Breakthrough
2021 Vol. 64 (15): 66-67 [Abstract] ( 85 ) HTMLNew PDF (401 KB)  ( 503 )
       RESEARCH
68 Review of Microalloying Effects on High Temperature Al3X Precipitates in Al Alloys
WANG Yu,WANG Junsheng, XUE Chengpeng,WANG Shuo,CHEN Dongxu,ZHANG Chi
DOI: 10.16080/j.issn1671-833x.2021.15.068
Al alloys are widely used in aerospace industries, but their high-temperature strength still cannot match with steels. Addition of transition metals and rare earth elements can effectively control the precipitation strengthening phases (Al3X) in Al alloys under high temperature conditions, and therefore their high-temperature mechanical properties can be improved significantly. This paper summarizes the current research progresses of the influence of microalloying elements on the high temperature precipitation strengthening of Al alloys. Combined with first-principles calculation, the latest developments in the thermodynamic parameters and properties of Al3X strengthening phase are described.
2021 Vol. 64 (15): 68-77/85 [Abstract] ( 167 ) HTMLNew PDF (1128 KB)  ( 865 )
78 Experimental Investigation on High-Feed Milling of A Novel Ultrahigh Strength β–Titanium Alloy
JIANG Yifan,SHI Kaojun,TIAN Hui,LI Liang
DOI: 10.16080/j.issn1671-833x.2021.15.078
An experimental investigation of high-feed milling on M28, a novel metastable β–Titanium alloy, was presented. The cutting forces and material removing rate of shoulder milling and high-feed milling were compared in the typical cutting parameters of each style. Cutting forces were also compared to reveal the effect of solution and aging heat treatment on M28 in milling. The influence of cutting speed and feed per tooth on the cutting force was also analyzed. A comparison cutting experiment between M28 and TC4 shows that the cutting force of the former was almost 200%–300% times that of the latter. All the results show that M28 is imparted a strong reinforcement effect of aging treatment and the cutting force of it is much larger than that of TC4 in the same condition. Due to more proportion of the cutting force can be transmitted into the spindle axial direction, the high-feed milling shows some kind of advantage in the machining of such kind of hard-to-machine material.
2021 Vol. 64 (15): 78-85 [Abstract] ( 130 ) HTMLNew PDF (6617 KB)  ( 331 )
86 Simulation Analysis on Drag Reduction Performance of Characteristic Parameters of V–Groove on Local Approximate Plane
XU Yan, ZHANG Chen, WANG Zixuan
DOI: 10.16080/j.issn1671-833x.2021.15.086
With the development of biomimetic surface engineering technology, the drag reduction characteristics of surface microtexture have been studied more and more, but its application is limited by the complex surface shape of the object and other conditions. A single microtexture is not applicable to the overall situation, and the overall analysis will consume a large amount of computing costs. In order to solve this problem, this paper adopts the idea of discrete, divides the complex surface into local facet to consider, and explores the drag reduction characteristics of micro-texture on local facet. Based on boundary layer theory, a design method of micro texture height and position is proposed, and in a small flat surface layout of different shape, depth, width and spacing of V–groove structure, using the method of computational fluid dynamics simulation of airflow in the small flat surface, various characteristic parameters for V–groove on the choice of drag reduction effects are explored. After analysis, the following rule can be obtained. When the flow velocity is 25m/s, the triangular micro-texture groove with depth of 0.2mm and width of 0.3mm has the best drag reduction effect, reaching 5.51% and the best dimensionless parameter y + =13.86. In microtexture designing, the dimensionless depth parameter is kept at about 14, which has the best drag reduction effect. The width to depth ratio of the drag reduction microtexture must be less than 1.5, and the smaller the spacing, the more obvious the drag reduction effect.
2021 Vol. 64 (15): 86-99 [Abstract] ( 113 ) HTMLNew PDF (86286 KB)  ( 149 )
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