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송영식(Y. S. Song),김병진(B. J. Kim),한성호(S. H. Han),진광근(K. G. Chin),최시훈(S. H. Choi) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.7
A visco-plastic self-consistent (VPSC) polycrystal model has been applied to simulate texture simulation and anisotropic properties of DP steels during deep drawing process. In order to evaluate the strain path during deep drawing, a steady state was assumed in the flange part of deep drawn cup. The final stable orientations were strongly dependent on the initial location in the blank. The evolution of anisotropy of DP steel sheets has been demonstrated through comparison of plastic strain rate vector at the different plastic strain levels.
AZ31 마그네슘합금 레이저 용접부의 미세조직 및 미소경도의 분포에 관한 연구
최영환(Y.H. Choi),이목영(M.Y. Lee),최시훈(S.-H. Choi) 한국레이저가공학회 2012 한국레이저가공학회지 Vol.15 No.3
The laser weld of AZ31 magnesium alloy was characterized with OM, EBSD and micros vickers hardness tester in experiment. EBSD analysis and micro-hardness measurements were carried out at the three regions (Equiaxed Zone, Columnar Dendrite Zone, Base Metal) of the welded AZ31Mg alloy sheets. The magnesium alloy show the rectangular shape bead in laser weld. EBSD analysis revealed that the three regions show the heterogeneous distribution of grain size and microtexture. Micro-hardness measurement also revealed that the heterogeneous distribution of microstructure contributed to the heterogeneous micro-hardness distribution in the three regions.