발간논문

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Vol.35, No.12, 1692 ~ 1699, 1997
Title
Study on the Hot Deformation behavior of CP-Titanium
김성곤 , 박중근 , 정종평 Seong Kon Kim , Joong Keun Park , Chong Pyoung Chung
Abstract
Hot deformation behavior of CP(Commercially Pure)-Ti has been studied using Thermacmaster at various strain rates (0.001s^(-1)-10s^(-1)) and temperatures (750℃-950℃). Steady state flow behavior was established at strain rates of 0.1s^(-1) and below and flow curves tend to exhibit a small degree of flow softening at comparatively high temperatures. Dynamic material behavior during hot deformation has been studied using a model of Prasad et al. The result shows that a maximum material flow occurs under the condition of the strain rates 0.001s^(-1)-0.001s^(-1) at temperatures 750-800℃. Dynamic recrystallization is observed to be a primary dynamic process occurring at these conditions. A microstructural instability region has been also determined using Prasad et al.`s model and was generally in agreement with the result of experimental observation that such region is associated with the formation of shear bands. These results lead to a determination of an optimum condition for hot deformation of CP-Ti.
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