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동적 비틀림 시험에 의한 냉간압연강에서의 국부소성변형 연구
Localized Plastic Deformation in a Cold Rolled Steel during Dynamic torsional Test
조경목(Kyung Mox Cho), 이성학(Sung Hak Lee), 박익민(Ik Min Park)
UCI I410-ECN-0102-2008-580-001848425

This paper presents the formation of adiabatic shear band during the dynamic torsional test in an AISI 1018 cold rolled steel. A torsional Kolsky bar was used to impose a dynamic deformation rate, viz., γ ◎ 1500/sec, in a short thin-walled tubular specimen. The plastic deformation process in the cold rolled steel could be divided into the following three separate stages ; (1) the homogeneous plastic deformation, (2) the inhomogeneous strain distribution in the axial direction, and (3) the narrowing of the localization into an adiabatic shear band, resulting in a loss in the load-carrying capacity of the steel. It was also found from microscopic observations of the shear band that the fracture occurred by a process of nucleation and coalescence of microcracks which initiated by the the shear cracking of pearlite grains. Elongated dimples were observed on fracture surfaces, indicating ductile fracture due to the local temperature rise during the dynamic deformation.

[자료제공 : 네이버학술정보]
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