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dc.contributor.author신동혁-
dc.date.accessioned2020-11-03T01:19:06Z-
dc.date.available2020-11-03T01:19:06Z-
dc.date.issued2003-01-
dc.identifier.citationMaterials Science & Engineering A v.340, no.1, page.243-250en_US
dc.identifier.issn0921-5093-
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0921509302001788-
dc.identifier.urihttps://repository.hanyang.ac.kr/handle/20.500.11754/155150-
dc.description.abstractUltrafine grained low carbon (0.15 wt.% C) steel produced by equal channel angular pressing (ECAP) was tested for investigating fatigue properties, including cyclic softening and crack growth rate. Emphasis was placed on investigating the effect of load ratio on the fatigue crack growth rates of ultrafine grained microstructure. The ECAPed steel exhibited cyclic softening. After the first cycle, the tension and compression peak stresses decreased gradually with the number of cycles. Fatigue crack growth resistance and the threshold of ECAPed ultrafine grained steel were lower than that of an as-received coarse grained steel. This was attributed to a less tortuous crack path. The ECAPed steel exhibited slightly higher crack growth rates and a lower ΔKth with an increase in R ratio. The R ratio effect on growth rates and ΔKth was basically indistinguishable at a lower load ratio (R>0.3) compared with other alloys, indicating that the contribution of the crack closure vanished. This was explained by the fact that finer grained materials produce a lower opening load Pop due to a relatively less serrated crack path. Consequently, Kmin can reach Kop readily with a smaller increment of load ratio. The crack growth rate curve for the ECAPed ultrafine grained steel exhibited a linear extension to the lower growth rate regime than that for the coarse grained as-received steel. This behavior can be explained by a reverse crack tip plastic zone size (rp) that is always larger than the grain size.en_US
dc.language.isoen_USen_US
dc.publisherELSEVIER SCIENCE SAen_US
dc.subjectLow carbon steelen_US
dc.subjectEqual channel angular pressingen_US
dc.subjectUtrafine grain sizeen_US
dc.subjectFatigueen_US
dc.subjectCracken_US
dc.subjectgrowth rateen_US
dc.titleFatigue properties of ultrafine grained low carbon steel produced by equal channel angular pressingen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/S0921-5093(02)00178-8-
dc.relation.journalMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES-
dc.contributor.googleauthorKim, Ho-Kyung-
dc.contributor.googleauthorChoi, Myung-Il-
dc.contributor.googleauthorChung, Chin-Sung-
dc.contributor.googleauthorShin, Dong Hyuk-
dc.relation.code2012206492-
dc.sector.campusE-
dc.sector.daehakCOLLEGE OF ENGINEERING SCIENCES[E]-
dc.sector.departmentDEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING-
dc.identifier.piddhshin-
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COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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