Fatigue Crack Growth Behavior in Ultrafine Grained Low Carbon Steel
- Title
- Fatigue Crack Growth Behavior in Ultrafine Grained Low Carbon Steel
- Author
- 신동혁
- Keywords
- Ultrafine Grained Materials; Fatigue Crack Growth; Crack Closure Effective Stress Intensity Range
- Issue Date
- 2002-10
- Publisher
- 대한기계학회
- Citation
- KSME International Journal, v. 16, no. 10, page. 1246-1252
- Abstract
- Ultrafine grained (UFG) low carbon (0.15 wt.% C) steel produced by equal channel angular pressing (ECAP) was tested for investigating the effect of load ratio on the fatigue crack growth rate. Fatigue crack growth resistance and threshold of UFG steel were lower than that of as-received coarse grained steel. It was attributed to the less tortuous crack path. The UFG steel exhibited slightly higher crack growth rates and a lower △K_th with an increase of R ratio. The R ratio effect on crack growth rates and △K_th was basically indistinguishable at lower load ratio (R>0.3), compared to other alloys, which indicates that contribution of the crack closure vanishes. The crack growth rate curve for UFG steel exhibited a longer linear extension to the lower growth rate regime than that for the coarse grained as-received steel.
- URI
- http://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE00531511?https://repository.hanyang.ac.kr/handle/20.500.11754/157735
- ISSN
- 1738-494X; 1976-3824
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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