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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2015.1
- 수록면
- 22 - 30 (9page)
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The fatigue crack propagation (FCP) tests were conducted on Fe24Mn steel in the region of base metal(BM), weld metal (WM) and fusion line (FL) at 298 and 110 K. The FCP rates of Fe24Mn specimens inthe region of BM, WM and FL were greatly decreased, while no notable difference in the fracture modewas observed, with decreasing temperature from 298 to 110 K. The FCP rates of Fe24Mn WM and FLspecimens were slightly lower than those of BM specimen at both room and cryogenic temperatures. TheSEM fractographic analyses suggested that each specimen showed the transgranular facets at both temperaturesin low and intermediate ΔK regimes. However, the morphological details varied depending on the regionof weld and testing temperature. Relatively large sized facets were observed for the WM specimen with thecolumnar grain boundary playing the same role as the grain boundary in the BM and the FL specimens inthe near-threshold ΔK regime. The FCP behavior of Fe24Mn steel in the region of BM, WM and FL isdiscussed at 298 and 110 K based on the fractographic and micrographic observation.
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