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신동준(D. J. Shin),김윤성(Y. S. Kim),김영석(Y. S. Kim),김대환(D. H. Kim),김성수(S. S. Kim),남원종(W. J. Nam),최희만(H. M. Choe) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
The thick and thin-plate specimen of 316L austenite stainless steel was charged with hydrogen using a cathodic charging technique. A high temperature homogenization treatment was applied to the thick specimens after hydrogen charging and copper electroplating to remove the hydrogen concentration gradient. For the thin plate, despite the short diffusion distance of hydrogen predicted by the diffusion-controlled model for a semi-infinite, the Vickers hardness measurements revealed the full effect of hydrogen in the center of the cross-sections of thin-plate specimens as well as in the vicinity of the outer surfaces, which appears to be due to the short-circuit diffusion mechanism along the grain boundaries. The room-temperature tensile properties of both undeformed and deformed (20, 40%) samples were examined and compared. Hydrogen softening was apparent in both types of samples. For example, the 40% deformed sample showed an approximately 17 and 7% lower yield and tensile strength, respectively, after hydrogen charging at a strain rate of 2x10?⁴s?¹with a concomitant decrease in ductility compared to that without hydrogen.
김용재(Y. J. Kim),강원구(W. G. Kang),김수겸(S. K. Kim),김지석(J. S. Kim),김준영(J. Y. Kim),신동준(D. J. Shin),윤삼손(S. S. Yoon),류시양(S. Y. Ryu) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
The size of electronic devices is becoming miniaturized and performances are becoming more and more high function. So power consumption of the product is greatly increased. And, in the progress of product development, thermal design is a very important task. In the thermal design process, we need many climate chambers to measure temperature of electronic components and check operation of the products under cold and hot environments. However, the climate chamber needs expensive maintenance cost and occupies large space. This is a huge burden to the company. Most developers replace high-temperature tests by low cost room temperature tests. There is an issue how much value the developers add to the results of room temperature tests for converting to the results of high temperature tests. In this paper, some results based on tests and thermal simulation analyses have been reported to suggest the value.