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국회도서관 홈으로 정보검색 소장정보 검색

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초록 9

제1장 서론 11

1. 서론 11

제2장 이론적 배경 19

2.1. 재료의 합금조성 19

2.2. 열처리 방법 20

2.3. 잔류오스테나이트의 영향 23

제3장 실험방법 30

3.1. 열처리 시행 조건 30

3.2. 미세조직 분석 34

3.3. 잔류오스테나이트 정량 분석 36

3.4. 잔류오스테나이트 형태 및 안정도 분석 37

3.5. 충격특성 분석 39

제4장 실험 결과 및 고찰 41

4.1. 미세조직 분석 41

4.2. 유효결정립 크기 측정 45

4.3. 잔류오스테나이트 정량 분석 47

4.4. 잔류오스테나이트 형태 및 안정도 분석 49

4.5. 저온인성 분석 55

제5장 결론 58

참고문헌 60

ABSTRACT 63

List of Tables

Table 1. Composition of the low alloy carbon steels elements 32

Table 2. Macro and micro polishing process 35

Table 3. Polishing process of specimen for EBSD analysis 38

Table 4. Impact test data sheet 57

List of Figures

Figure 1. Composition of the spent nuclear fuel 14

Figure 2. Management process of spent nuclear fuel in nuclear power plant 15

Figure 3. Expected saturation year of spent nuclear fuel in Korea 16

Figure 4. Possible defects by irradiation in cask materials 17

Figure 5. Material embrittlement caused by irradiation 18

Figure 6. Crack energy loss in crack preparation by grain refinement 22

Figure 7. Relationship between carbon fraction and retained austenite 27

Figure 8. Relationship between Impact energy and retained austenite... 28

Figure 9. Relationship between Impact energy and retained austenite... 29

Figure 10. Heat treatment process 33

Figure 11. (a) Charpy impact tester (b) Impact test specimen 40

Figure 12. Optical microscope images for microstructure of specimen after... 43

Figure 13. SEM images for microstructure of specimen after heat treatment... 44

Figure 14. Euler color map of EBSD for heat treated specimen 46

Figure 15. XRD spectra of retained austenite after each heat-treated... 48

Figure 16. FSD Mixed image of QLLT treated specimen 51

Figure 17. Phase mapping image of QLLT treated specimen 52

Figure 18. TEM images for retained austenite morphology in QLLT... 53

Figure 19. (a) EDS line scanning (b) Pattern indexing of ferrite and... 54

Figure 20. DBTT curve of impact absorbed energy 56