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- 저자 : ChuanJie Wang (검색결과 6 건)
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Chuanjie Wang,Shaoxi Xue,Gang Chen,Peng Zhang 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.2
In micro-scaled plastic deformation, material strength and ductile fracture behaviors of thin sheet in tensionare quite different from those in macro-scale. In this study, uniaxial tensile tests of Monel 400 thin sheets withdifferent microstructures were carried out to investigate the plastic deformation size effect in micro-scale. Theexperimental results indicate that the flow stress and fracture strain departure from the traditional empirical formulawhen there are only fewer grains across the thickness. And the number of dimples on the fracture surface isgetting smaller with the decreasing ratio of specimen thickness to grain size. Then, a constitutive model basedon dislocation density considering the free surface effect in micro-scale is proposed to reveal the mechanism ofthe flow stress size effect. In addition, a model is proposed considering the surface roughening inducing thethickness nonuniform and the decrease of micro-voids resulting from the reduction of grain boundary densitywith the decreasing ratio of specimen thickness to grain size. The interactive effects of the surface rougheningand the decrease of micro-voids result in the earlier fracture in micro tension of the specimen with fewergrains across the thickness
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Effect of Heat Treatments on Microstructures and Tensile Properties of Cu–3 wt%Ag–0.5 wt%Zr Alloy
Gang Chen,ChuanJie Wang,Ying Zhang,Cen Yi,Peng Zhang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.2
The microstructures and tensile properties of Cu–3 wt%Ag–0.5 wt%Zr alloy sheets under different aging treatments areinvestigated in this research. As one kind of precipitate, Ag nanoparticles with coherent orientation relationship with matrixprecipitate. However, after the peak-age point, most of Ag nanoparticles grow into short rod shape with the interface translatingto semi-coherent, which leads to the lower strength of over-aging sample. The yield strength is estimated by consideringsolid solute, grain boundary and precipitation strengthening mechanisms. The result shows that the Ag precipitates providethe main strengthening role. Then a constitutive equation representing the evolution of dislocation density with plastic strainis built by considering work-hardening behavior coming from shearable and non-shearable precipitates which is mainly theparticles containing Zr. The flow stress contributed by shearable particle hardening is higher than that of non-shearable one. Due to the coarsening of grain boundary precipitates and low rate of damage accumulation of these non-shearable particles,the micro-cracks nucleate easily at grain boundary which leads to intergranular fracture.
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Peng Zhang,Han Wang,ShengJie Yao,ChuanJie Wang,Qiang Zhu,Gang Chen 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2
The Cu–3 wt%Ag–0.5 wt%Zr are rolled with the same reduction process at room (RT) and cryogenic (CT) temperature,respectively. The electron backscatter diffraction and transmission electron microscope are used to analyze and comparethe evolutions of material microstructure and texture. The results show that the stability of as-rolled CT sheets is differentfrom that of the RT samples, which can be verified by the lower temperature for the occurrence of recrystallization andAg-base particles precipitation. Besides the Brass, Copper and S textures which are exhibited in the two kinds of as-rolledsheets, there are also Q and P texture components in the as-rolled CT sheets. The constitutive equation basing on evolutionof dislocation mean free path (L) and dislocation cell size (dDC) with plastic strain indicates that the initial values of L, dDCand mobile dislocation density (ρm) are associated with annealing condition closely. Furthermore, the strain ranges of thestable and instable plastic deformation are related to the degree of recovery and recrystallization.
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Tianyun Wan,Huihuang Ma,Zijian Wang,Chuanjie Fan,Xiaodong Zhou 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
Carbon fiber reinforced polyether-ether-ketone (CF/PEEK) composite materials had a wide range of applicationsin the aerospace, electronics and electrical fields, etc. The composite materials were generally prepared from prepregs. Commonly used prepreg tape preparation methods had disadvantages of uneven resin distribution and inadequate fiberimpregnation, resulting in high porosity and poor mechanical properties. In this research, a combined process of the doublepowder impregnation method and the melt homogenization method was used to prepare the CF/PEEK prepreg tape to solvethe previous problems. Using this method, the porosity of the prepreg tape was reduced by 56.30 % and the tensile strengthwas increased by 43.35 % compared with the traditional powder impregnation method. At the same time, the prepreg tapewas widened and thinned and the uniformity of resin distribution was improved. Besides, based on the single factorexperiment, the response surface method was used to construct the impregnation model of the quadratic polynomialregression equation between the process parameters (powder impregnation temperature, traction speed and melthomogenization temperature) and the porosity of the CF/PEEK prepreg tape. According to this model, the process parametersfor the porosity of the prepreg tape were calculated to reach the minimum, namely, the powder impregnation temperature was380 ℃, the traction speed was 1 m/min, and the melt homogenization temperature was 380 ℃. As a result of these processparameters, the porosity of the prepreg tape could be reduced to 7.39 %. Subsequently, the model was verified throughexperiments, which could provide a reference for the process parameters setting of the impregnation process.
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Direct Observation of Radiative Flux in the Southern Yellow Sea
Lu, Lian-Gang,Yu, Fei,Diao, Xinyuan,Guo, Jingsong,Wang, Huiwu,Wei, Chuanjie The Korean Society of Oceanography 2008 Ocean science journal Vol.43 No.2
Direct measurements of four radiative components at air-sea boundary layer were conducted in the southern Yellow Sea during three cruises (seasons) in 2007. Simultaneous observations of meteorological (cloud cover, air temperature and humidity) and oceanographic (sea surface temperature) parameters were carried out. Observational results of radiative fluxes and meteorological and oceanographic parameters are presented. Mean diurnal cycles of four radiative components, net radiation, and sea surface albedo are calculated to achieve averages in different seasons. Net radiative fluxes in three seasons (winter, spring, autumn) are 8, 146, $60\;W/m^2$, respectively. Comparisons between the observed radiative fluxes and those estimated with formulas are taken.
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