Enhanced Low-Cycle Fatigue Life by Pre-Straining in an Fe-17Mn-0.8C Twinning Induced Plasticity Steel
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- Title
- Enhanced Low-Cycle Fatigue Life by Pre-Straining in an Fe-17Mn-0.8C Twinning Induced Plasticity Steel
- Authors
- Guo, Q; Chun, YS; Lee, JH; HEO, YOON UK; Lee, CS
- Date Issued
- 2014-11
- Publisher
- KOREAN INST METALS MATERIALS
- Abstract
- Enhancement of low-cycle fatigue (LCF) life was achieved by imposing pre-straining in an Fe-17Mn-0.8C twinning induced plasticity steel. Two different straining methods (uni-axial tension and drawing) were utilized with strain levels of 0, 0.2, and 0.4. The beneficial effect of pre-straining for LCF life was elucidated by microstructural observation using scanning and transmission electron microscopy. In both pre-strain modes, the fraction and variant of mechanical twins (MTs) are increased with the amount of pre-strain. Particularly, pre-drawing generated more multi-variant MTs and resulted in better LCF performance than those of uni-axially tensioned specimen. The role of MTs or stacking faults as a barrier of dislocation glide was clarified by transmission electron microscopy analysis of fatigued specimens. Fractographic analysis also showed that crack deflection occurred predominantly in the pre-strained specimens, which was effective in retarding crack propagation.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13630
- DOI
- 10.1007/S12540-014-6007-5
- ISSN
- 1598-9623
- Article Type
- Article
- Citation
- METALS AND MATERIALS INTERNATIONAL, vol. 20, no. 6, page. 1043 - 1051, 2014-11
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