발간논문

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Vol.38, No.5, 647 ~ 653, 2000
Title
Pesearch Paper / Mechanical Behavior : Effects of Misorientation at the Boundary on the Propagation of Brittle Crack in Mn-Mo-Ni Low Alloy Steel
김민철Min Chul Kim,오용준Yong Jun Oh,홍준화Jun Hwa Hong
Abstract
The effect of orientation relationship between two adjacent grains on the brittle crack propagation was systematically investigated in the viewpoint of misorientation at the boundaries using Electron Back-Scatter Diffraction(EBSD) technique. Crystallographic orientation around the path of secondary crack under the fracture surface has been observed with fractured 3 point band specimen at -100℃. Use of EBSD technique allows the crystallographic cracking plane of the material to be inferred. For every crack observed, the trace of the plane was perpendicular to a $lt;001$gt; direction of the cracked packet. The concept of the geometric compatibility factor has been introduced in order to explain and predict the crack propagation between two adjacent grains. This factor can be calculated from the measuring the two angles from {001} pole figure. A possible cracking plane predicted from calculation of a geometric compatibility factor was coincident with those found in observation.
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