LNG 304 스테인레스강의 피로균열전파특성과 변형유발 마르텐사이트 함량의 변화

• 영문명: Characteristics of Fatigue Crack Propagation and Changes in Strain Induced Martensite α’ of STS 304 Stainless Steel
• 발행기관: 강원대학교 산업기술연구소
• 저자명: 김송희(Kim Song Hee) 박형래(Pak Hyung Rae) 이현승(Lee Hyun Seung)
• 간행물 정보: 『산업기술연구』vol.21, 341~348쪽, 전체 8쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2001.09.30

영문 초록

The effect of initial α’ in STS 304 Stainless Steel on fatigue resistance, and fatigue crack propagation behavior was studied with using C-T specimens. Higher △Kth, was observed in the specimens with the content of 0% initial α’ than in the contents of 2% and 33% initial α’. The difference of da/dN at the same level of ΔK was distinctive in low and intermediate level of △K however became less different as the level of △K increased. It is because the formation of strain induced martensite occurred readily in lower α’ at the vicinity of the fatigue crack tip, which causes compressive residual stresses resulting in the enhancement of crack closure. In general fatigue cracks propagated transgranular mode and many segments of ridges were observed on the fracture surfaces. At the higher contents of initial α’ appeared the smaller size of ridge segments. Slips in austenite were blocked more frequently by the martensite colonies formed in austenite.

목차

Abstract

1. 서론

2. 재료 및 실험방법

3. 결과 및 고찰

4. 결론

참고문헌

키워드

304스테인레스 강 피로균열전파 변형유발 마르텐사이트 304 Stainless Steel fatigue crack propagation stain induced martensite