고주파유도로를 이용한 초급속열처리 구상흑연주철의 피로파괴특성

• 영문명: Fatigue fracture behavior in super-rapid induction quenched spheroidal graphite cast iron
• 발행기관: 강원대학교 산업기술연구소
• 저자명: 지정근(Ji Jueng Keun) 김진학(Kim Jin Hak) 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 carried out to investigate the fatigue behavior of high performance ductile cast iron experienced super rapid induction heat treatment. The effect of super rapid induction treatment on fatigue limit was experimentally examined with the special focus on the variation of surface microstructure and the fatigue crack initiation and propagation through fractography. Main results obtained are as follows. By super rapid induction treatment in FCD500, the martensite structure obtained through conventional quenching heat treatment was confirmed on the specimen surface. The fatigue crack initiation in the hardened surface layer was restricted by the martensite structure and compressive residual stress. Thus, it could be interpreted that the initiation stress would be increased by the improvement of surface structure. The fatigue crack propagation in the hardened layer was retarded by the presence of the globular shape martensite around the graphite nodule and compressive residual stress. The crack propagation path has shown zigzag pattern in the hardened surface layer.

목차

Abatract

1. 서론

2. 시험편의준비 및 실험방법

3. 실험결과 및 고찰

4. 결론

참고문헌

키워드

피로한도 초급속열처리 구상흑연 잔류응력 Fatigue Limit Super Rapid Treatment Graphite Nodule Residual Stress