표제지
목차
Abstract 11
Ⅰ. 서론 13
1. 연구 배경 13
2. 연구 목표 16
Ⅱ. 이론적 배경 18
1. 세라믹 강화 금속 기지 복합소재 제조 방법 18
1) 고상 제조 공정 18
2) 액상 제조 공정 18
2. 니켈 23
3. TiC/Fe 금속복합소재 24
4. Invar 효과 25
5. 변형 유기 마르텐사이트 변태 29
Ⅲ. 실험 방법 33
1. 가스압 함침공정을 통한 복합소재 제조방법 33
2. 미세조직 및 상분석 42
1) 열역학 계산 42
2) FE-SEM 미세조직 관찰 42
3) XRD 상분석 43
4) EBSD 상 분석 43
3. 기계적 특성 44
1) 압축 시험 44
2) Rockwell 경도 시험 44
4. 열적 특성 45
1) 열팽창 시험 45
Ⅳ. 결과 및 토론 46
1. 미세조직 및 상분석 결과 46
1) 열역학 계산 결과 46
2) FE-SEM 관찰 결과 48
3) XRD 상분석 결과 52
4) EBSD phase map 분석 결과 54
2. 기계적 특성 측정 결과 56
1) 압축 강도 시험 56
2) 로크웰 경도 측정 58
3) 압축강도 vs 경도 60
4) MMCs의 마르텐사이트 변태 효과 62
3. 열적 특성 측정 결과 67
1) TiC/Invar 금속복합소재 열팽창 측정 67
2) Ni 함량별 TiC/Fe-Ni 금속복합소재 열팽창계수 측정 결과 69
Ⅴ. 결론 77
Ⅵ. 참고 문헌 79
국문 초록[내용없음] 6
Table. 1. Target Composition of Fe-Ni base metal material. 37
Table. 2. Result of spectroscopic analysis of Fe-Ni base metal material. 38
Fig. 1. Schema of Stir casting process 21
Fig. 2. Schema of Gas pressure infiltration process 22
Fig. 3. Thermal expansion coefficient graph according to Ni content of Fe-Ni alloy 27
Fig. 4. A schematic diagram of the principle of the Invar effect 28
Fig. 5. Schematic illustration showing chemical free energy of austenite and martensite as a function of temperature. 30
Fig. 6. Formation of α'-martensite at the micro-shear band intersection 31
Fig. 7. Stress-strain curve due to strain-induced martensite transformation occurs 32
Fig. 8. FE-SEM Images of TiC powder as received materials. (a) low resolution image and (b) high resolution image. 35
Fig. 9. XRD peaks of as-received TiC powder. 36
Fig. 10. Schematic diagram of gas pressure infiltration process for manufacturing 39
Fig. 11. Resin-infiltrated porous TiC preform SEM image after sintering. 40
Fig. 12. Detail graph during gas pressure infiltration process 41
Fig. 13. FactSage thermodynamic calculation results for each Ni addition of TiC/Fe composites. (a) Pure Fe (b) Ni 10 wt.% (c) Ni 20 wt.% (d) Ni 30 wt.% (e) Ni 40 wt.% 47
Fig. 14. FE-SEM observation of the BSE microstructure image of TiC/Fe-Ni composites. (x5k) (a) Pure Fe (b) Ni 10 wt.% (c) Ni 20 wt.% (d) Ni 30 wt.%... 49
Fig. 15. JMatPro CCT curve graph calculation result of alloy according to Ni addition amount. 50
Fig. 16. CCT curve graph of expected matrix phase at Ni 10 wt.% 51
Fig. 17. (a) XRD peak graph of TiC/Fe-Ni composites according to Ni content. (b) Comparison of FCC (111) peak and BCC (110) peak in the range of 43 to 45° 53
Fig. 18. EBSD phase color image of TiC/Fe-Ni composites. (a) Pure Fe matrix (b) Ni 10 wt.% matrix (c) Ni 20 wt.% matrix (d) Ni 30 wt.% matrix (e) Ni 40... 55
Fig. 19. Stress-strain curve of compression test by Ni content of TiC/Fe-Ni MMCs 57
Fig. 20. Microstructure and Rockwell Hardness C-scale results according to Ni content of TiC/Fe-Ni MMCs 59
Fig. 21. Comparison of compressive strength and HRC ratio calculated based on pure Fe matrix. 61
Fig. 22. Magnetic properties of TiC/Fe-Ni metal composites. (a) Hysteresis curve of as-cast specimen before compression test. (b) Hysteresis curve after... 64
Fig. 23. EBSD phase color image before and after compression test of TiC/Fe-Ni MMCs. (a) Ni 10 wt.% specimen before compression test. (b) Ni 20 wt.%... 65
Fig. 24. Schematic diagram of martensite transformation of metastable austenite in MMCs 66
Fig. 25. GTE (Coefficient of Thermal Expansion) of TiC/Invar composites as determined by TMA (30~500℃) 68
Fig. 26. CTE graph of TiC/Fe-Ni metal composites according to Ni content determined by TMA (temperature range 0~500℃) 72
Fig. 27. Comparison of CTE values for each temperature range (30~200℃, 30~400℃) 73
Fig. 28. First and second measurement results of thermal expansion coefficient of TiC/Fe-10Ni MMCs 74
Fig. 29. Comparison of EBSD phase color images before and after measuring the thermal expansion coefficient of TiC/Fe-10Ni MMCs. (a) Before thermal... 75
Fig. 30. Schematic diagram of the crystal structure of the Fe FCC and BCC phases. 76