Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11007016 | Materials Science and Engineering: A | 2018 | 14 Pages |
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 1100â¯â to increase its grain size, or 2) subjected to high-pressure torsion then annealed at 650â¯â 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Jae Ik Yoon, Hak Hyeon Lee, Jaimyun Jung, Hyoung Seop Kim,