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Vol.41, No.2, 96 ~ 104, 2002
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| Title |
| Mechanical Behavior : Analysis of Micro-Mechanical Properties and Microstructure of Low-alloy Steel Using Indentation Technique |
| 김성훈 Sung Hoon Kim , 최열 Yeol Choi , 이봉상 Bong Sang Lee , 홍준화 Jun Hwa Hong , 권동일 Dong Il Kwon |
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| Abstract |
| Low alloy steels for nuclear reactor are degraded progressively through microstructural changes due to high operation temperature and irradiation. Strength properties are the most important factors for the selection of materials and the determination of degradation degree. Interfacial properties affected by strengthening particles with the range of nm size and strength distribution in microstructures could not be tested by the conventional mechanical testing methods. Microindentation and nanoindentation technique have been studied as a alternative of conventional methods. Specially, nanoindentation technique with a μN load range and a nm residual indent size range has been highlightened as a tool which is very useful to determine those properties. Since each phase composing microstructure of steels has a characteristic hardness value, it is possible to characterize phase on the basis of that character. In this study, by using of microindentation and nanoindentation technique can be evaluated microstructural mechanical properties of low alloy steels manufactured under 7 different kinds of processes. Through the study, we verified potentialities whether or not indentation technique can be used as a method to determine degree of degradation. |
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| Key Words |
| Low-alloy steel, Microindentation, Nanoindentation Characteristic hardness, Phase characterization, Degree of degradation |
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