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Effects of Crystallographic Orientation Relatiotionships on the Propagation of Brittle Crack in Mn-Mo-Ni Low Alloy Steel

Published online by Cambridge University Press:  02 July 2020

Yong-Jun Oh ,
Min-Chul Kim  and
Jun-Hwa Hong
Yong-Jun Oh
Affiliation:
Reactor Materials Department, Korea Atomic Energy Research Institute, P.O.Box 105 Yusong, Taejon305-353 Korea
Min-Chul Kim
Affiliation:
Reactor Materials Department, Korea Atomic Energy Research Institute, P.O.Box 105 Yusong, Taejon305-353 Korea
Jun-Hwa Hong
Affiliation:
Reactor Materials Department, Korea Atomic Energy Research Institute, P.O.Box 105 Yusong, Taejon305-353 Korea
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Extract

Boundary properties between two adjacent grains with different crystallographic orientation relation are important factors in deciding the mechanical properties of materials. The concept of the geometric compatibility factor has been introduced in order to explain the relationship between transfer of deformation mode and crystal orientation. In the same manner, when the brittle crack propagates, grain boundary also obstructs crack propagation. Therefore it is also possible to introduce the concept of geometric compatibility considering the crystallographic orientation in analyzing the crack propagation.

In this study, the characteristics of the brittle crack propagation in bainitic low alloy steel with compositions shown in table 1 have been investigated using EBSD analysis. A 3-point bending test was performed at -100°C and the secondary crack below fracture surface was analyzed in relation to the crystallographic orientation. In order to explain the behavior of crack propagation, modified geometric compatibility factor, M was introduced considering loading axis and crystallographic orientation relationship.

Type
Advances in the Instrumentation and Application of Electron Backscatter Diffraction in the SEM
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 952 - 953
Copyright
Copyright © Microscopy Society of America

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References

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