고체적률 TiC/Fe 금속복합소재의 Ni 함량에 따른 특성연구
- Alternative Title
- A study on the properties of high volume ratio TiC/Fe metal matrix composites according to the Ni content
- Abstract
- Due to its combination of light weight, high strength, wear resistance, oxidation resistance, and thermal stability, MMC (Metal Matrix Composite) is receiving a lot of attention in a variety of industries, including aerospace, transportation, and energy storage. The TiC/Fe composite material stands out among MMCs in particular. In comparison to steel materials, introducing TiC at a volume percentage of 40% or higher enables a weight reduction of nearly 20%. It may also be modified to satisfy a variety of needs, making it a viable replacement for traditional alloy materials. As a result, a lot of research is being done to see if TiC/Fe composites may be used as an alternative to current alloy materials.
During the manufacturing process of TiC/Fe composites, TiC is melted and dissolved into the metal matrix. This leads to an increase in carbon content and the formation of cementite (Fe3C), resulting in a visible pearlite lamellar structure within the matrix. The presence of pearlite can potentially have a negative impact on the mechanical properties of the composite. To eliminate this, nickel (Ni) is added as a stabilizing element with high carbon solubility to inhibit the formation of cementite within the composite material. By adjusting the amount of Ni added, TiC/Fe-Ni composites are manufactured, and changes in the microstructure and properties are observed.
To understand the effects of Ni addition on the TiC/Fe-Ni composites, various characterization techniques are employed. Thermochemical calculations using Factsage are conducted to predict the phases formed within the composite material based on the initial amount of Ni added. The microstructure of the manufactured composites is observed using FE-SEM, and changes in the base material's microstructure are examined through XRD and EBSD analysis. Additionally, hardness, compressive strength, and coefficient of thermal expansion (CTE) measurements are performed to assess the changes in properties of the TiC/Fe-Ni composites with varying Ni content.
Consequently, the incorporation of Ni in TiC/Fe composites offers the potential to improve microstructural changes, toughness, strength, and thermal expansion characteristics, providing new opportunities for advanced materials in various applications
- Issued Date
- 2023
- Awarded Date
- 2023-08
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 신소재시스템공학과
- Advisor
- 권한상
- Table Of Contents
- I. 서 론 1
1. 연구 배경 1
2. 연구 목표 4
II. 이론적 배경 6
1. 세라믹 강화 금속 기지 복합소재 제조 방법 6
1) 고상 제조 공정 6
2) 액상 제조 공정 6
2. 니켈 11
3. TiC/Fe 금속복합소재 12
4. Invar 효과 13
5. 변형 유기 마르텐사이트 변태 17
III. 실험 방법 21
1. 가스압 함침공정을 통한 복합소재 제조방법 22
2. 미세조직 및 상분석 30
1) 열역학 계산 30
2) FE-SEM 미세조직 관찰 30
3) XRD 상분석 31
4) EBSD 상분석 31
3. 기계적 특성 32
1) 압축 시험 32
2) Rockwell 경도 시험 32
4. 열적 특성 33
1) 열팽창 시험 33
IV. 결과 및 토론 34
1. 미세조직 및 상분석 결과 34
1) 열역학 계산 결과 34
2) FE-SEM 관찰 결과 36
3) XRD 상분석 결과 40
4) EBSD phase map 분석 결과 42
2. 기계적 특성 측정 결과 44
1) 압축 강도 시험 44
2) 로크웰 경도 측정 46
3) 압축강도 vs 경도 48
4) MMCs의 마르텐사이트 변태 효과 50
3. 열적 특성 측정 결과 55
1) TiC/Invar 금속복합소재 열팽창 측정 55
2) Ni 함량별 TiC/Fe-Ni 금속복합소재 열팽창계수 측정 결과 57
V. 결론 65
참고문헌 67
- Degree
- Master
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