논문 상세보기
pp.211-220
In this study, three kinds of bainitic steel plates are manufactured by varying the chemical compositions and their microstructures are analyzed. Tensile and Charpy impact tests are performed at room and low temperature to investigate the correlation between microstructure and mechanical properties. In addition, heat affected zone (HAZ) specimens are fabricated by a simulation of welding processes, and the HAZ microstructure is analyzed. The base steel that has the lowest carbon equivalent has the highest volume fraction of acicular ferrite and the lowest volume fraction of secondary phases, so the strength is the lowest and the elongation is the highest. The Mo steel has a higher volume fraction of granular bainite and more secondary phases than the base steel, so the strength is high and the elongation is low. The CrNi steel has the highest volume fraction of the secondary phases, so the strength is the highest and elongation is the lowest. The tensile properties of the steels, namely, strength and elongation, have a linear correlation with the volume fraction of secondary phases. The Mo steel has the lowest Charpy impact energy at -80 oC because of coarse granular bainite. In the Base-HAZ and Mo-HAZ specimens, the hardness increases as the volume fraction of martensite-austenite constituents increases. In the CrNi-HAZ specimen, however, hardness increases as the volume fraction of martensite and bainitic ferrite increases.
서 론
2. 실험 방법
2.1 베이나이트계 후판강의 제조 및 열영향부 모사
2.2 미세조직 분석 및 기계적 특성 평가
3. 실험 결과
3.1. 모재 조직과 기계적 특성
3.2 열영향부 조직과 경도
4. 결과 고찰
4.1 베이나이트계 후판강의 조직과 기계적 특성에 미치는 화학 조성의 영향
4.2 열영향부 조직 형성에 미치는 화학 조성의 영향
5. 결 론
References
