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http://dx.doi.org/10.3795/KSME-A.2005.29.11.1494

Improvement of Fatigue Properties in Ultrafine Grained Pure Ti after ECAP(Equal Channel Angular Pressing)  

Lee, Young-In (서울산업대학교 대학원 자동차공학과)
Park, Jin-Ho (서울산업대학교 대학원 자동차공학과)
Choi, Deok-Ho (서울산업대학교 대학원 자동차공학과)
Choi, Myung-Il (덴티움(주) 기술연구소)
Kim, Ho-Kyung (서울산업대학교 자동차공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.29, no.11, 2005 , pp. 1494-1502 More about this Journal
Abstract
Fatigue life and notch sensitivity of the ultrafine grained pure Ti produced by ECAP was investigated. The ECAPed sample with the true strain of 460$\%$ showed near equiaxed grains with an average size of about 0.3 $\mu$m. After ECAP, the ultimate tensile strength was increased by 60$\%$, while the tensile ductility was decreased by 31$\%$. The ECAPed ultrafine grained pure Ti samples showed high notch sensitivity and significant improvement of high cycle fatigue limit by a factor of 1.67. The ECAPed samples also show high notch sensitivity (K$_{f}$/K$_{t}$ = 0.96). It can be concluded that ECAP is the effective process for achieving high fatigue strength in Ti by increasing its tensile strength through grain refinement
Keywords
Pure Ti; Equal Channel Angular Pressing; Ultrafine Grained Microstructures; Fatigue; Notch Sensitivity; Fatigue Limit;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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