Effect of grain size on stretch-flangeability of twinning-induced plasticity steels
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- Title
- Effect of grain size on stretch-flangeability of twinning-induced plasticity steels
- Authors
- Yoon, Jae Ik; Lee, Hak Hyeon; Jung, Jaimyun; Kim, Hyoung Seop
- Date Issued
- 2018-09
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- The effect of grain size on stretch-flangeability was investigated to determine its influence on stretch-flangeability of high strength steels. To avoid other effects of microstructure, single-phase twinning-induced plasticity (TWIP) steels were selected for the investigation. To control the grain size of two types of TWIP steels, 1) the initial specimen was annealed at 1100 degrees C to increase its grain size, or 2) subjected to high-pressure torsion then annealed at 650 degrees C to reduce the grain size. The microstructural features were analyzed using the electron backscatter diffraction. The stretch-flangeability of TWIP steels with various grain sizes was evaluated using a hole-expansion test. It was found that the hole-expansion ratio follows the Hall-Petch correlation as does fracture toughness. To improve the stretch-flangeability of high strength steels, microstructural features should be designed to increase their fracture toughness.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/95654
- DOI
- 10.1016/j.msea.2018.08.052
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 735, page. 295 - 301, 2018-09
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