2021 Vol. 36, No. 3

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Materials Research
Effect of Sn Content on Microstructure, Machinability and Mechanical Properties of 2011 Aluminum Alloy Bar
ZHANG Dapeng, FAN Yuanbo, NIU Yanping, SHI Changliang, CAI Yuehua
2021, 36(3): 1-6.
[Abstract](158) [PDF 22016KB](11)
Abstract:
The free cutting 2011 aluminum alloy bars without lead were prepared by substituting Sn and Bi for Pb. The effect of Sn content on microstructure, machinability and mechanical properties of 2011 aluminum alloy bar were studied by metallographic microscope, scanning electron microscope, tensile testing machine and high-speed lathe. The results showed that when the Sn content was 0.2%, Sn mainly existed in the form of SnBi eutectic phase in aluminum alloy bars. When the content of Sn exceeded 0.2%, Sn existed in the form of Sn phase and SnBi eutectic phase. The higher the Sn content was, the more the amount of Sn phase and SnBi eutectic phase were, and the better the machinability of aluminum alloy bar was. However, the tensile strength and the elongation of aluminum alloy bar decreased slightly with the increase of Sn content.
Effect of Heat Treatment Process on Particle Size and Uniformity of SnO2 Atomized Powder
XIE Bin, ZHOU Haitao, DUAN Haiyang
2021, 36(3): 7-11.
[Abstract](147) [PDF 6054KB](7)
Abstract:
Incomplete oxidation nano SnO2 powder with tetragonal phase was prepared by arc plasma process with Sn as raw material. The relationship between the growth rate and the temperature of SnO2 powder was studied by different heat treatment process. The original SnO2 powder was heat treated with different temperatures and holding time. X-ray diffraction(XRD) and scanning electron microscope(SEM) were used to analyze the compositions and morphologies of the samples. The experimental results showed that the grain size of SnO2 powder prepared by plasma atomization increased in two stages with temperature, and the proper heat treatment process could improve the particle size uniformity.
Interval Multiscale Homogenization Analysis of Heterogeneous Composite Materials Based on Improved PSO Algorithm at Finite Deformation
LIN Feng
2021, 36(3): 12-18.
[Abstract](149) [PDF 5525KB](7)
Abstract:
Heterogeneous composite material in the context of elasticity at finite deformation was studied by the method of internal homogenization analysis. In the process of research, the multiscale finite mechanism was introduced and the heterogeneous composite material was taken as a non-local representative volume element(RVE). The interval effective quantities such as tangent tensor, first Piola-Kirchhoff stress and strain energy were obtained by using a multiscale finite element strategy combined with the improved particle swarm optimization algorithm, with full consideration of the internal parameter uncertainty of RVE set in different deformation-controlled boundary conditions and the effect of different internal conditions on the interval effective quantities of the RVE.
Controlled Release Mechanism of Polyurethane Based on Block Polyether Ester Polyols
YI Jie, WANG Chuanbao, DAI Zhengwei, TANG Bolin
2021, 36(3): 19-24.
[Abstract](95) [PDF 2844KB](7)
Abstract:
According to the special antifouling need of elastic base metal of the marine engineering equipment, a series of novel block polyether ester polyols based on PEG and caprolactonehad were prepared and the degradable polyurethane films were prepared by solution casting with a series of polyether ester polyols and cross linker agent. The hydrophilia and the degradation of the polyurethane films were investigated. The relationship between structure and degradable properties of polyurethane films were investigated. The degradable polyurethane marine antifouling paints were prepared by mixing cuprous oxide and the polyether ester polyols, and the controlled release mechanism of paints was investigated.
Comparison of Different Testing Methods for Acoustic Properties of Small Samples of Underwater Acoustic Materials
FAN Ningbo, REN Weiwei, QIAO Dongping
2021, 36(3): 25-29.
[Abstract](178) [PDF 2962KB](8)
Abstract:
Three different testing methods for acoustic properties of underwater acoustic materials were presented. Through the performance test and analysis of the same kinds of samples, the advantages and disadvantages of different test methods were compared. The results showed that compared with traveling wave method, pulse method and standing wave method were more reliable in testing.
Research on Preparation of Phenol-resistantheavy-duty Anticorrosive Coating for Petrochemistry
LI Zhiqin
2021, 36(3): 30-35.
[Abstract](141) [PDF 6281KB](13)
Abstract:
The influence of polysulfide rubber modified epoxy resin on properties of phenol-resistant heavy-duty anticorrosive coating was studied via FT-IR, SEM and immersion experiment. The influence of the functional filler on phenol-resistant properties of the coating was also studied. The results showed that the coating had good performance when taking the polysulfide rubber modified epoxy resin as the main film forming material, the glass flake as functional packing, the PVC as 3.5 and the percentage of lamellar filler as 50%. After a year of immersion in petrochemical sewage lagoon, the coating was still in good condition.
Study on Preparation of Glass Fiber (GF) Reinforced Unsaturated Polyester Resin (UPR) Rebar by Light Curing
LIAN Xu, GAO Yuanbo, GUO Yadong, LI Ming, WANG Xueli, HE Yong
2021, 36(3): 36-41,61.
[Abstract](235) [PDF 4253KB](13)
Abstract:
Five kinds of photoinitiators were used to prepare glass fiber(GF) reinforced unsaturated polyester resin(UPR) rebar with the diameter up to 1.5 cm by LED UV curing technology. The thermogravimetric analysis and mechanical property tests were carried out for the resultant composites and the effects of photoinitiator species and concentration(0.1%~2.0%, mass friction), wavelength of ultraviolet light(365 nm and 395 nm), light intensity(30~750 mW/cm2) and exposure time on the curing and properties were investigated. The results revealed that the light source with wavelength of 365 nm had better curing effect; the apparent curing time was generally shortened with the increase of light intensity for a given initiator; the Barcol hardness increased with the increase of light intensity and became more stable. Under the same ultraviolet light intensity, the apparent curing time generally decreased with the increase of photoinitiator concentration except for PI1 photoinitiator, with which, the apparent curing time decreased first and then increased with the increase of photoinitiator concentration. The tensile strength and the elastic modulus of the composite with PI0 or PI5 photoinitiators after UV exposure of 40 s reached up to 1 000 MPa and 45 GPa, respectively, which were higher than those of the composite by heat curing. These results suggested that the LED UV curing could be an efficient method to prepare GF/UPR rebars with diameter up to centimeter level.
Material Application
Study on 3D Printing Process Optimization of ABS Plastics
FU Jianjun
2021, 36(3): 42-45.
[Abstract](42) [PDF 935KB](7)
Abstract:
The effect of 3 D printing process parameters on the warpage deformation of ABS plastic mobile phone shell was studied.Resultsshowed that the best combination of process parameters was when the temperature of feeding section was 200℃, the temperature of compression section 210℃, the temperature of homogenization section 230℃, the printing rate 40 mm/s, and the printing platform temperature 60℃. For the printing temperature parameters, the compression section temperature and homogenization section temperature had significant effects on the warpage of the workpiece, while the temperature of the feeding section had a little effect on the warpage; in addition, the printing rate and printing platform temperature also had significant influence on the warpage. Ten groups of ABS plastic mobile phone shell were prepared under the optimal process parameters. The maximum warpage deformation of the corresponding parts was 0.056 2 mm, and the minimum was 0.051 2 mm. The absolute error of each group of parts was small, with the maximum only 0.001 8 mm and the minimum 0.051 2 mm. The standard deviation of ten groups of experiments was 0.000 5.
Discussion on Cracking Maintenance Technology of Transition Joint of Marine Aluminum Alloy-Pure Aluminum-Steel Composite
WANG Dongtao, LIU Jintao, GONG Rong
2021, 36(3): 46-49.
[Abstract](107) [PDF 2337KB](14)
Abstract:
By maintaining the cracks of aluminum alloy-pure aluminum-steel composite transition joint, the cracking defects removal, replacement and repair of cracking defects and cracking prevention measures were discussed, which could provide references for subsequent products of the same type.
Application of γ-TiAl-based Alloy in Diesel Engine
LUO Zhangzeng, LI Hua, WEI Tao, LI Xiaobing, MA Yingche, LIU Kui
2021, 36(3): 50-57.
[Abstract](159) [PDF 9450KB](23)
Abstract:
The necessity of lightweight design for key hot end components of diesel engine, and the advantages and application status of γ-TiAl alloys in this field were generally reviewed. The challenges and difficulties faced large-scale industrial application of γ-TiAl alloys were mainly described, and suggestions on the composition design of low-cost γ-TiAl alloys for diesel engines were put forward.
Preparation and Application of Precision Titanium Foil and Strip
WEN Fangming, LI Bobo, TAO Huifa, LIU Yinqi, ZHU Lele
2021, 36(3): 58-61.
[Abstract](70) [PDF 811KB](14)
Abstract:
The technical requirements, domestic production status and production process flow of precision titanium foil and strip were introduced, the application fields and prospects described, and suggestions for accelerating the development of precision titanium foil and strip in China put forward.
Preparation and Properties of a Reflective Organic-inorganic Composite High-energy Laser Ablative Coating
ZHANG Lili, CHEN Kaifeng, YANG Zhen, ZHANG Jianlong
2021, 36(3): 62-66.
[Abstract](96) [PDF 4069KB](17)
Abstract:
With phenolic resin and epoxy resin as binder and the single factor investigation method, the effects of high reflectivity heat-resisting packing materials of ZrO2 and Al2O3 were investigated, respectively. The resistance to high energy laser ablation, holding time to laser ablation and the surface reflectivity before and after the irradiation were characterized. The surface morphologies before and after irradiation were compared by observation and XRD testing to observe the crystal form changes of the heat resistant packing materials.Resultsshowed that ZrO2 had good resistance to high-energy laser ablation with the tolerance of the power density of high-energy laser irradiation up to 2.35 kW/cm2, and that the surface reflectivity increased by 46.28% after laser irradiation.
Long-term Anti-corrosion Technology of Bridge Steel Structure and its Application in Xiamen Second East Passage
YE Lipeng
2021, 36(3): 67-73.
[Abstract](135) [PDF 3768KB](13)
Abstract:
Here were introduced the currently situation of long-term anti-corrosion technologies in China and abroad:one was a relatively mature composite coating system with sprayed metal coating as a primer, and the other was a heavy-duty anti-corrosion coating system with zinc-rich primer as a supporting system. The differences of anti-corrosion performances of 3 typical anticorrosion coatings in atmospheric area of bridge steel structure were listed. According to the environmental characteristics of Xiamen Second East Passage, and combined with anti-corrosion technologies of domestic and foreign bridge steel structures, feasible anti-corrosion coating of epoxy zinc-rich primer-epoxy intermediate paint-fluorocarbon top coat was proposed for the outer surface of steel box girder.
Welding Technology
Influence of E36 Steel Plate Components on the Toughness of Submerged Arc Welding Joint
LIU Gang, DING Penglong, GAO Zhenpeng
2021, 36(3): 74-77.
[Abstract](42) [PDF 4079KB](8)
Abstract:
In order to study the influence of elements C,Ni, Nb and Ti in steel on the toughness of submerged arc welding joint, the mechanical property tests and series of temperature Charpy impact tests were carried out for 3 batches of 12 mm E36 steel plates produced by TMCP process. The results indicated that the low-temperature toughness of the submerged arc welding joint could be improved by reducing the C element and adding the Ni element; Nb and Ti microalloying was helpful to refine the grain of parent material and at the same time to inhibit the grain coarsening of heat-affected zone; However, the Nb element should be controlled properly because of its adverse effect on the toughness of the submerged arc welding joint.
High Strength Steel for Welding with High Heat Input Developed in Japan
YIN Shike, WANG Changchang, WANG Cun
2021, 36(3): 78-85.
[Abstract](218) [PDF 8682KB](20)
Abstract:
In order to improve the welding efficiency of ship structure and building structure, high heat input welding should be used. Two Japanese companies had developed many technologies, including effective control of grain size in HAZ by using TiN, refining grain by ferrite nucleation, and the control of microstructure in HAZ and the TMCP controlled rolling technology, etc. By combining these new technologies, high strength steels for welding with various high heat inputs were successfully developed, which could be used in shipbuilding, buildings, bridges and ensure the toughness of HAZ with high heat input.
Review
Research Progress on Stress Reduction Heat Treatment of Low Alloy Steel
WANG Renfu, YAO Zhiying, DENG Wanping, NIU Jicheng, YE Fan
2021, 36(3): 86-94.
[Abstract](131) [PDF 2333KB](11)
Abstract:
Here were introduced the welding residual stress and its elimination methods, and summarized the mechanism of heat treatment method to eliminate residual stress, process parameter design, characteristics of stress reduction heat treatment of low alloy steel, and the law of the effect of this treatment on the properties and residual stress of low alloy steel component. It was pointed out that, for the low alloy steel components, except for the stress relief reduction, it was necessary to avoid the material deterioration after stress relief heat treatment as far as possible in the process of material selection, production of the component and the formulation of heat treatment parameters.
Experience Exchange
Research and Application of On-line Monitoring Technology of Offshore Wind Power Equipment Corrosion
JIA Yanbing, GAO Hongbiao, QIAN Zhenghong, LIU Biyan, WANG Panjun
2021, 36(3): 95-100.
[Abstract](315) [PDF 3639KB](29)
Abstract:
The electrochemical corrosion monitoring technology suitable for offshore wind power was introduced, and the development status of offshore wind power corrosion monitoring technology summarized. The corrosion monitoring requirements of offshore wind power equipment was analyzed, and the atmospheric environmental corrosion monitor was adopted to monitor the corrosion of offshore wind power equipment in real-time. The results of the monitoring data showed that the offshore wind power corrosion monitoring system had the features of fast detection speed, high sensitivity, accurate detection data, and a high degree of automation, which could truly feedback the on-site corrosion environment to the remote operation and maintenance terminal in real-time.

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