페라이트-베이나이트-마르텐사이트강의 조직과 기계적 성질에 미치는 베이나이트의 영향 = Effect of Bainite on the Microstructure and Mechanical Properties of Ferrite-Martensite-Bainite Steels

다국어 초록 (Multilingual Abstract)

The effect of volume fraction and morphology of bainite on the microstructure and mechanical properties of Fe-0.1C-1.6Mn-0.8Si tri-phase (ferrite-bainite-martensite) steels was investigated. The volume fraction and morphology of bainite were controlled by isothermal holding for different periods at two levels of bainite transformation temperature before quenching in water. The size of martensite particles became finer with increasing volume fraction of bainite in the tri-phase steel. Lower bainite and upper bainite were observed in the tri-phase steel by transmission electron microscopy. The improvement in ductility (elongation and reduction of area) with increasing volume fraction of bainite in the tai-phase steel was attributed to dispersion of fine martensite particles and less hard bainite, that resulted in higher work hardening and relaxation of stress concentration.

목차 (Table of Contents)

• 1. 서론
• 2. 실험방법
• 3. 실험결과 및 고찰
• 베이나이트의 부피분율에 따른 조직변화
• 상부 베이나이트와 하부 베이나이트 조직
• 베이나이트의 부피분율에 따른 기계적성질의 변화
• 4. 결론