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Title of Journal: Metall and Mat Trans A

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Abbravation: Metallurgical and Materials Transactions A

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Springer US

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DOI

10.1016/0272-8842(85)90287-1

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1543-1940

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Dynamic Torsional Deformation Behavior of UltraFi

Authors: Byoungchul Hwang Yang Gon Kim Sunghak Lee Duck Young Hwang Dong Hyuk Shin
Publish Date: 2007/11/01
Volume: 38, Issue: 12, Pages: 3007-3013
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Abstract

Dynamic torsional deformation behavior of an ultrafinegrained dualphase steel fabricated by equal channel angular pressing ECAP was investigated and compared with that of an equal channel angular pressed ECAPed ultrafinegrained lowcarbon 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 lowcarbon steel consisted of very fine elongated ferritepearlite grains of 05 μm in size and the ECAPed dualphase steel consisted of ferritemartensite grains of 1 μm in size The dynamic torsional test results indicated that maximum shear stress of the dualphase steel was lower than that of the conventional steel but that fracture shear strain was higher in the dualphase steel Some adiabatic shear bands were observed at the gage center of the dynamically deformed torsional specimen of the lowcarbon steel but they were not observed in the dualphase steel because localized deformation was alleviated by the increased strain hardenability These results suggested that the ECAPed ultrafinegrained dualphase steel could be a good way to increase the fracture resistance under dynamic loading as the formation of adiabatic shear bands was reduced or preventedThis work was supported by the National Research Laboratory Program of the Korea Science and Engineering Foundation KOSEF and Grant No 06K150100220 from the Center for Nanostructured Materials Technology under the 21 Century Frontier RD Programs of the Ministry of Science and Technology Korea

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