Dynamic torsional deformation behavior of ultra-fine-grained dual-phase steel fabricated by equal channel angular pressing
SCIE
SCOPUS
- Title
- Dynamic torsional deformation behavior of ultra-fine-grained dual-phase steel fabricated by equal channel angular pressing
- Authors
- Hwang, B; Kim, YG; Lee, S; Hwang, DY; Shin, DH
- Date Issued
- 2007-12
- Publisher
- SPRINGER
- Abstract
- Dynamic torsional deformation behavior of an ultra-fine-grained dual-phase steel fabricated by equal channel angular pressing (ECAP) was investigated and compared with that of an equal channel angular pressed (ECAPed) ultra-fine-grained low-carbon steel. Tensile and dynamic torsional tests were conducted on these two steels, and the deformed microstructures were observed to investigate the dynamic deformation behavior. The ECAPed low-carbon steel consisted of very fine, elongated ferrite-pearlite grains of 0.5 mu m in size, and the ECAPed dual-phase steel consisted of ferrite-martensite grains of 1 mu m in size. The dynamic torsional test results indicated that maximum shear stress of the dual-phase steel was lower than that of the conventional steel, but that fracture shear strain was higher in the dual-phase steel. Some adiabatic shear bands were observed at the gage center of the dynamically deformed torsional specimen of the low-carbon steel, but they were not observed in the dual-phase steel because localized deformation was alleviated by the increased strain hardenability. These results suggested that the ECAPed ultra-fine-grained dual-phase steel could be a good way to increase the fracture resistance under dynamic loading as the formation of adiabatic shear bands was reduced or prevented.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11516
- DOI
- 10.1007/s11661-007-9348-6
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 38A, no. 12, page. 3007 - 3013, 2007-12
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