발간논문

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Vol.30, No.12, 1535 ~ 1541, 1992
Title
Adiabatic Shear Band in an HY - 100 Steel ( 2 ) ( Temperature measurement )
이성학Sung hak Lee, 이창길Chang Gil Lee, 조경목Kyung Mox Cho, 지영조Young Cho Chi
Abstract
Highly localized deformation, frequently referred to as adiabatic shear banding, is a phenomenon observed in metals subjected to a high rate of deformation. The purpose of the present study was to establish temperature rise by determining temperature distribution within an adiabatic shear band during its formation in an HY-100 steel. Thin walled tubular specimens were deformed at dynamic rates in a torsional Kolsky bar, and temperature measurements were conducted using an array of sixteen infrared radiation detectors. The optical system allowed each detector to focus on a band 17㎛ wide. The infra-red detector system indicated that the average temperature rise in the narrow bands attained a maximum of 600℃. It was also suggested to measure temperature rise more precisely that the width of the observed area on the specimen`s surface should be reduced further. In addition to the improvement of the temperature measuring technique, transmission electron microscopy would be very helpful to the understanding of possible phase transformations occurring during the adiabatic shear band formation.
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