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- 저자 : Zhanwei Yuan (검색결과 3 건)
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Zhanwei Yuan,Huan Liu,Zhe Ma,Xinkai Ma,Kai Wang,Xuemin Zhang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.5
In this paper, CoCrFeNiMo0.2particles reinforced titanium matrix composites were prepared by hot pressing sintering in thevacuum, and the volume fraction of CoCrFeNiMo0.2particles was 7%. The microstructure of the composites was analyzed byX-ray diffraction, scanning electron microscope and electron probe, and the micro-mechanical properties of the compositeswere studied by nano indentation technology. Based on the combination of experimental research and numerical simulation,the deformation process and damage behavior of the composites were studied. The tensile strength of the compositeswas 689 MPa, and the strain at break was 12.2%. The damage behavior and stress–strain curve of the composites in thein-situ tensile process were compared with the simulation process to verify the accuracy of the modeling results. Throughthe analysis of the simulation results, it is found that the particles bear a larger load than the matrix during the deformationprocess. When the composites reach the peak stress, the average stress on the particles is about 580 MPa, the average stresson the interface is about 620 MPa, and the average stress on the matrix is about 446 MPa.
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Zhanwei Yuan,Shanglin Wang,Hao Zhang,Fuguo Li,Rui Ma,Jie Bai 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
GH3536 nickel-based superalloy was prepared using selective laser melting (SLM) to study its hot deformation behavior,microstructure evolution, and recrystallization mechanism during hot compression. GH3536 superalloy was hot compressedby a Gleeble-3800 hot simulation testing machine. The compression temperature was 900℃~1050℃, and the strain rate was0.01s− 1~10s− 1. The results show that the deformation conditions will significantly affect the flow stress, dislocation density,and the development of grain boundary and subgrains boundary. The dynamic recrystallization (DRX) mechanism is alsoeasily affected by the deformation conditions and different deformation regions. The alloy has experienced work hardening(WH), dynamic recovery (DRV), and DRX in hot deformation and finally entered the steady-state rheological stage. Thedynamic softening effect is more evident at a low strain rate. The temperature will strongly affect the migration of dislocationsand limit the transformation from LAGB to HAGB, thus affecting the formation of grain boundaries and finally affectingthe DRX mechanism. It is found that DRX is not a single process, and discontinuous dynamic recrystallization (DDRX)and continuous dynamic recrystallization (CDRX) exist at the same time. DDRX is the primary nucleation mechanismcharacterized by grain boundary expansion. CDRX is an auxiliary nucleation mechanism characterized by gradual rotationof subgrains, and CDRX is easier to activate at low temperatures.
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Yuan Jian,Zhang Lei,Huo Zhanwei 한국항공우주학회 2020 International Journal of Aeronautical and Space Sc Vol.21 No.4
An equivalent modeling method for honeycomb sandwich structure is presented in this paper. Honeycomb core is regarded as an interlayer and orthogonal anisotropic solid elements are used to model it, while the panels of honeycomb sandwich structure are represented by shell elements. This method not only controls model size and ensures computational efficiency, but also solves the problem that two-dimensional model cannot represent the internal stress distribution and local deformation. Based on the orthogonal anisotropy of honeycomb and the actual cellular size, 9 independent elastic parameters of the interlayer are given, so that the physical properties of the interlayer are described completely. In the example, the displacement errors under typical static loadcases are less than 3.12% and the frequency errors of the first six orders are less than 4.07%, compared with the precise model. A modal tapping test was carried out on a payload mounting panel with honeycomb sandwich structure. By comparing the test data with the analysis data of the equivalent model, it was shown that the frequency errors of the first six orders were all within 5%, and the analysis modes were consistent with the experimental fitting modes, which further verified the validity of the equivalent method.
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