타이타늄의 동종 및 이종소재 마찰교반 용접의 건전성 확보를 위한 공정 최적화 연구

다국어 초록 (Multilingual Abstract)

Dissimilar welding of titanium and copper is very difficult by fusion welding because the melting point of the material is very different and intermetallic compound (IMC) with brittle property can be readily produced in melted zone and heat affected zone, etc. The fusion welding operated at high temperature over 1700℃ can increase the fusion zone and invite cracking by IMC. In addition, total cost for fusion welding may increase because the fusion welding is performed in inert atmosphere to prevent high temperature oxidation. Friction stir welding (FSW) as a type of solid state welding was applied to Ti-Cu dissimilar welding in order to obtain a sound welded zone and reduce
the total process cost. It is very important to set the optimal conditions because the joint of dissimilar materials by solid state welding may be greatly affected by the process conditions. In this study, it has been investigated how the metal flow of the weld zone changes according to the welding condition of when Ti-Cu plates are welded by FSW.
The microstructural evolution of fusion zone were investigated and the soundness of weld zone and the mechanical properties were evaluated through the microstructural evolution.

목차 (Table of Contents)

• Ⅰ. 서론 1
• Ⅱ. 이론적 배경 3
• 1. 타이타늄의 특성 3
• 2. 구리의 특성 4
• 3. 동적 재결정 5
• 4.마찰교반 용접 7
• 5.타이타늄-구리 금속간 화합물 8
• Ⅲ. 실험방법 10
• 1. 실험 소재 및 공정 조건 10
• 2. 미세조직 관찰 16
• 3. 기계적 특성 평가 17
• Ⅳ. 실험결과 및 고찰 18
• 1. 타이타늄 동종 마찰교반 용접 18
• 2. 타이타늄-구리 이종 마찰교반 용접 29
• Ⅴ. 결론 56
• Ⅵ. 참고문헌 58