Grain Refinement Mechanism during Equal Channel Angular Pressing of a Low Carbon Steel
- Title
- Grain Refinement Mechanism during Equal Channel Angular Pressing of a Low Carbon Steel
- Author
- 신동혁
- Keywords
- Steels; Transmission electron microscopy (TEM); Equal-channel angular pressing
- Issue Date
- 2001-04
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- Acta Materialia, v. 49, issue. 7, page. 1285-1292
- Abstract
- The grain refinement mechanism during equal-channel angular pressing of a plain low-carbon steel was explored by a careful analysis of the slip systems operating at each pass of repetitive pressing. The steel was subjected to one to eight passes of pressing, in which a single passage yielded an effective strain of ∼1, at 623 K. At the initial stage of pressing, submicrometer-order ferrite grains enclosed by serrated and low-angled boundaries were formed. Transmission electron microscopy examination revealed that these boundaries resulted from interaction between the slip systems that are typical in body-centered cubic structures. Further pressings mainly resulted in rotation of ultrafine subgrains rather than grain refinement, providing the formation of high-angle grain boundaries. Since the serrated boundaries restrict dislocation movement, the rotation of subgrains with the serrated boundaries is more favorable for accommodating further deformation than intragranular strain, and therefore boundaries become high-angled.
- URI
- https://www.sciencedirect.com/science/article/pii/S1359645401000106https://repository.hanyang.ac.kr/handle/20.500.11754/158511
- ISSN
- 1359-6454; 1873-2453
- DOI
- 10.1016/S1359-6454(01)00010-6
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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