Dynamic Deformation Behavior of UltraFine-Grained Low-Carbon Steels Fabricated by Equal-Channel Angular Pressing
- Title
- Dynamic Deformation Behavior of UltraFine-Grained Low-Carbon Steels Fabricated by Equal-Channel Angular Pressing
- Author
- 신동혁
- Keywords
- Material Transaction; Shear Band; Pearlite; Adiabatic Shear Band; Increase Annealing Time
- Issue Date
- 2005-02
- Publisher
- MINERALS METALS MATERIALS SOC
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v. 36, No. 2, Page. 389-397
- Abstract
- The dynamic deformation behavior of ultrafine-grained low-carbon steels fabricated by equal-channel angular pressing (ECAP) was investigated in this study. Dynamic torsional tests, using a torsional Kolsky bar, were conducted on four steel specimens, two of which were annealed at 480 degreesC after ECAP, and then the test data were compared in terms of microstructures, tensile properties, and adiabatic shear-band formation. The equal-channel angular pressed specimen consisted of very fine, equiaxed grains of 0.2 to 0.3 mum in size, which were slightly coarsened after annealing. The dynamic torsional test results indicated that maximum shear stress decreased with increasing annealing time, whereas fracture shear strain increased. Some adiabatic shear bands were observed at the gage center of the dynamically deformed torsional specimen. Their width was smaller in the equal-channel angular pressed specimen than in the 1-hour-annealed specimen, but they were not found in the 24-hour-annealed specimen. Ultrafine, equiaxed grains of 0.05 to 0.2 mum in size were formed inside the adiabatic shear band, and their boundaries had characteristics of high-angle grain boundaries. These phenomena were explained by dynamic recrystallization due to a highly localized plastic strain and temperature rise during dynamic deformation.
- URI
- https://link.springer.com/article/10.1007/s11661-005-0310-1https://repository.hanyang.ac.kr/handle/20.500.11754/110147
- ISSN
- 1073-5623
- DOI
- 10.1007/s11661-005-0310-1
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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