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Effect of Pre-Straining on High Cycle Fatigue and Fatigue Crack Propagation Behaviors of Complex Phase Steel

Authors
Kim, SuminSong, TaejinSung, HyokyungKim, Sangshik
Issue Date
Oct-2021
Publisher
KOREAN INST METALS MATERIALS
Keywords
CP steel; Pre-straining; High cycle fatigue; Fatigue crack propagation; Dislocation structure
Citation
METALS AND MATERIALS INTERNATIONAL, v.27, no.10, pp 3810 - 3822
Pages
13
Indexed
SCIE
SCOPUS
KCI
Journal Title
METALS AND MATERIALS INTERNATIONAL
Volume
27
Number
10
Start Page
3810
End Page
3822
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/3149
DOI
10.1007/s12540-020-00751-4
ISSN
1598-9623
2005-4149
Abstract
Pre-straining tends to increase yield/tensile strengths and dislocation density by strain hardening of steel while also, affecting its high cycle fatigue (HCF) and fatigue crack propagation (FCP) behaviors greatly. The HCF and FCP behaviors of complex phase (CP) steel with different levels of pre-straining from 0 to 9% were examined. It was found that the resistance to HCF of CP steel decreased with 5% pre-straining, while it increased with 9% pre-straining, suggesting that such an abnormal HCF behavior of CP steel with different levels of pre-straining could be attributed to the nature of dislocation structure formed during cyclic straining. Based on the detailed micrographic and fractographic analyses, the effect of pre-straining up to 9% on the fatigue behavior of CP steel was discussed. Graphic
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Kim, Sang Shik
대학원 (나노신소재융합공학과)
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