발간논문

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Vol.38, No.6, 757 ~ 766, 2000
Title
Pesearch Paper / Mechanical Behaviors : Correlation of Microstructure with Quasi - Static and Dynamic Deformation Behavior of Ti - 6Al - 4V Alloy
이동근Dong Geon Lee,김상호Sang Ho Kim,이성학Sang Hak Lee,이종수Chong Soo Lee
Abstract
The effects of microstructural morphology on the quasi-static and dynamic deformation behavior of Ti-6Al-4V alloy were investigated in this study. Quasi-static and dynamic torsional tests were conducted using a torsional Kolsky bar for Widmansta¨tten, equiaxed, and bimodal microstructures, which were processed by different heat-treatments. And then the test data were correlated with microstructures, tensile properties, and fracture mode. The fracture behavior of the three microstructures was found to be independent of stress state and loading rate. Dynamic torsional behavior indicated that the equiaxed microstructure was prone to form adiabatic shear bands in comparison with other microstructures. The possibility of the shear band formation was analyzed from the energy required for plastic deformation and from the difference of the void initiation behavior under quasi-static and dynamic loading states.
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