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RISS 인기검색어
- 검색키워드
- 저자 : K. Hokamoto (검색결과 3 건)
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Optimization of Process Parameters in Explosive Cladding of Mild Steel and Aluminum
Raghukandan, K.,Hokamoto, K.,Manikandan, P. 대한금속재료학회 2004 METALS AND MATERIALS International Vol.10 No.2
Explosive cladding is best known for its capability to join a wide variety of both similar and dissimilar combinations of metals that cannot be joined by other conventional metal joining techniques. An attempt has been made to optimize the tensile and shear strengths of an explosive clad interface using fuzzy logic and genetic algorithm. The parameters considered for this study include flyer plate thickness, loading ratio, angle of inclination, and stand off distance. The experimental data was trained and simulated using fuzzy logic and the optimization of process parameters was performed using genetic algorithm. The optimized process parameters were validated using experimental results.
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Metallic Glass Formation at the Interface of Explosively Welded Nb and Stainless Steel
I. A. Bataev,K. Hokamoto,H. Keno,A. A. Bataev,I. A. Balagansky,A. V. Vinogradov 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.4
The interface between explosively welded niobium and stainless steel SUS 304 was studied using scanning electron microscopy, transmission electron microscopy and energy dispersive X-Ray spectroscopy. The wavy interface along which vortex zones were located was observed. The vortex zones formed due to the mixing of materials typically had amorphous structure. Inoue’s criteria of glass formation were used to explain this result. The effect of the composition, cooling rate and pressure on the glass formation are discussed. The conditions of deformation, heating, and cooling as well as shockwaves propagation were numerically simulated. We show that the conditions of vortex zone formation resemble the conditions of rapid solidification processes. In contrast to the "classical" methods of rapid solidification of melt, the conditions of metastable phase formation during explosive welding are significantly complicated by the fluctuations of composition and pressure. Possible metastable structures formation at the interface of some common explosively joined materials is predicted.
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Mechanical Milling and Synthesis of Mg-SiC Composites Using Underwater Shock Consolidation
A. Nayeem Faruqui,P. Manikandan,T. Sato,Y. Mitsuno,K. Hokamoto 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
In this work, mechanical milling of magnesium with SiC particles with variation of parameters, such as ball-to-powder ratio, milling speed, milling time, and process controlling agent (PCA), is reported. Milling was also conducted without using PCA to explore its role on the mechanical milling process. Milling was performed in a planetary ball mill. The results show that a uniform distribution of the reinforcement, good particle yield, and particle size reduction can be achieved by controlling the parameters. The milling powders were compacted using the underwater shock wave generated by the detonation of an explosive. The samples were characterized by XRD, scanning electron microscopy, and microhardness testing. Microstructural charac-terization revealed a well flown magnesium matrix enveloping reasonably well dispersed SiC particles. The results of microhardness testing reveal an increase in the hardness of the composite.
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