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한흥남,이창길,김성준,오창석,이태호 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.3
A computational model, which can describe the mechanically-induced martensite transformation of metastable austenite, is suggested. The strain originated from the transformation of metastable austenite into martensite is evaluated by assessing the difference of the nucleation rate of variants, which was determined from the interaction energy between externally applied stress state and lattice deformation based on the K-S relationship. A self-consistent model with the Eshelby's solution is employed to predict the deformation behavior. A simple iterative calculation was carried out to predict the stress-strain behaviors under the uniaxial stress state. The calculated results are compared with the experimental data for various strain rates. Good agreement is found between the calculated and experimental values of transformation kinetics and stress-strain behavior.
Han, Jung-Hoon,Oh, Juhyun,Yoon, Sangmoon,Kim, Yanghoo,Han, Heung Nam,Kim, Miyoung Korean Society of Microscopy 2016 Applied microscopy Vol.46 No.4
Twinning-induced plasticity (TWIP) steels with the austenite structure containing high manganese exhibit both good strength and excellent formability. Such properties originate from crystallographic slip and mechanical twins produced when the austenite structure is under mechanical stress. There are 12 twin systems, referred to as twin variants, when slip is induced. These twin systems include twin planes and twin directions and play an important role in determining strength and ductility of the material by strongly influencing texture formation of the austenite structure. In the present study, twins produced in a high-Mn TWIP steel as a result of uniaxial tension were observed using a transmission electron microscope; a comparative analysis was performed through interaction energy calculations. Electron diffraction was used to determine the twin system with respect to the uniaxial tension direction in each grain. Both the Schmid factors and interacting energies required for the generation of twins were calculated and subsequently compared with experimental results. This approach demonstrated the possibility of predicting the deformation behavior of the material.
Human Melanoma Cells Adhesion on the Surface of Polymeric Chemoattractants
( Heung Jae Chun ),( Ju Woong Jang ),( Han Joon Kim ),( Kyu Nam Park ),( Jung Hee Wee ),( Who Kyong Lee ),( Anthony Addison ),( Richard B. Beard ) 한국조직공학·재생의학회 2008 조직공학과 재생의학 Vol.5 No.4
Two dimensional(2-D) polymeric matrices with free radical generating quinoid compounds, hydroquinone- grafted-polypropylene(HQ-g-PP) and vitamin-K1-grafted-polypropylene(VK1-g-PP), were prepared by a liquid phase photo-grafting technique, and the adhesion of primary(WM 793) and metastatic(WM 1205) human melanoma cells to prepared surfaces was investigated. Grafting of polar groups in VK1and HQ increased surface tension of PP matrices from 27 dyne/cm to 39 dyne/cm, resulting in decreased protein adsorption. In addition, electron paramagnetic resonance(EPR) spectra showed that the matrices generated free radicals at the interface when in contact with serum. Both WM 793 and WM 1205 cells showed an enhanced adhesion to the prepared samples compared to the control PP. The adhesion of metastatic melanoma cells onto the polymeric matrices was more pronounced than that of primary melanoma cells. VK1-g-PP with twice as many free radical generating groups in a unit graft yield as HQ-g-PP had a greater cell adhesion. The number of cells adhered to the surface of the polymeric chemoattractants increases with increase in the content of free radicals at the interface.