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Ti 첨가 고강도 IF강의 r값 이방성에 미치는 carbon의 영향
崔時熏,鄭鎭煥 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.3
The macroscopic texture and r-value (width-to-thickness plastic strain ratio in uniaxial tension) anisotropy in Ti-added high strength IF steels were investigated. In order to consider the effect of carbon on r-value anisotropy in the steels, metallurgical parameters (grain size, precipitates and texture) in the hot-rolled, cold-rolled and annealed specimens were investigated. Initial grain size in the hot band and distribution of precipitates in the annealed specimen were main metallurgical factors influencing the macroscopic annealing texture and r-value anisotropy in the Ti-added high strength IF steels. Predictions of r-value anisotropy were carried out using a full-constraints Taylor polycrystal model. The predicted r-value anisotropy were in good agreement with experimental data.
최시훈,D. H. Kim,B. S. Seong 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.2
To investigate strain-softening behavior during plastic deformation of an AZ31 Mg alloy, cylindrical specimens were compressed in a rolling direction at 300 °C. Experimental evidence revealed that an inhomogeneous microstructure evolved due to the softening behavior associated with deformation at elevated temperatures. The large grains that reoriented as a result of deformation twinning were free of dynamic recrystallization (DRX). Fine grains nucleated at grain boundaries of grains were deformed by a slip-dominated mechanism, which accommodated the external strain. A visco-plastic self-consistent (VPSC) polycrystal model was used to simulate softening of the flow stress curve and texture evolution during uniaxial compression. A softening scheme was implemented in the polycrystal model to predict the softening phenomenon and texture evolution after the peak stress. The original VPSC model was modified to simulate texture evolution in an AZ31 Mg alloy that exhibited twin-dominated deformation before the peak stress. To investigate strain-softening behavior during plastic deformation of an AZ31 Mg alloy, cylindrical specimens were compressed in a rolling direction at 300 °C. Experimental evidence revealed that an inhomogeneous microstructure evolved due to the softening behavior associated with deformation at elevated temperatures. The large grains that reoriented as a result of deformation twinning were free of dynamic recrystallization (DRX). Fine grains nucleated at grain boundaries of grains were deformed by a slip-dominated mechanism, which accommodated the external strain. A visco-plastic self-consistent (VPSC) polycrystal model was used to simulate softening of the flow stress curve and texture evolution during uniaxial compression. A softening scheme was implemented in the polycrystal model to predict the softening phenomenon and texture evolution after the peak stress. The original VPSC model was modified to simulate texture evolution in an AZ31 Mg alloy that exhibited twin-dominated deformation before the peak stress.