고강도 구상흑연주철의 피로한도에 미치는 2상 기지조직의 영향

• 영문명: Effects of 2-phase matrix structure on fatigue limit of high strength ductile iron
• 발행기관: 강원대학교 산업기술연구소
• 저자명: 김진학(Kim Jin Hak) 지정근(Ji Jueng Keun) 김민건(Kim Min Gun)
• 간행물 정보: 『산업기술연구』vol.19, 1~5쪽, 전체 5쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 1999.09.30

영문 초록

Rotary bending fatigue tests were performed to investigate the effects of 2-phase matrix structure on fatigue limit with prepared specimens in high strength ductile irons. Two types of the specimens with different microstructures have been used. Series A has sorbite and series B has bainite. Fatigue limits of both specimens are improved comparing with as cast specimen. The fatigue limit is higher in series B than in series A. The reason why the fatigue limit of series A shows inferiority to that of series B is due to the transition of micro fatigue cracks to mesocrack occurs very rapidly, so increased stress intensity factor drives the fatigue crack growth. The higher fatigue limit of series B which has bainite is caused by the γ layer contained in microstructure impede the rapid growth of micro fatigue crack to mesocrack and α layer around graphite has the higher capacity fro the absorption of plastic deformation energy than sorbite.

목차

Abatract

1. 서론

2. 실험재료 및 실험방법

3. 실험결과 및 고찰

4. 결론

참고문헌

키워드

피로 피로한도 베이나이트 2상 기지조직 구상흑연주철 Fatigue Fatigue Limit Bainite 2-Phase Matrix Structure Ductile iron