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Microstructural development of adiabatic shear bands in ultra-fine-grained low-carbon steels fabricated by equal channel angular pressing

Title
Microstructural development of adiabatic shear bands in ultra-fine-grained low-carbon steels fabricated by equal channel angular pressing
Author
신동혁
Keywords
dynamic torsional test; ultra-fine-grained low-carbon steel; equal channel angular pressing (ECAP); adiabatic shear band; annealing
Issue Date
2006-12
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 441, No. 1-2, Page. 308-320
Abstract
Microstructural development of adiabatic shear bands formed in ultra-fine-grained low-carbon steels fabricated by equal channel angular pressing (ECAP) was investigated in this study. Dynamic torsional tests were conducted on four steel specimens, two of which were annealed after ECAP, using a torsional Kolsky bar. The ECAPed specimen consisted of fine equiaxed grains of 0.2 mu m in size, which were slightly coarsened and had an equiaxed shape after annealing. Some adiabatic shear bands were observed at the gage center of the dynamically deformed torsional specimen, and their width was narrower in the ECAPed specimen than in the 1-h annealed specimen. Detailed transmission electron microscopic analysis on adiabatic shear bands indicated that very fine equiaxed grains of 0.05-0.2 mu m in size were developed within the adiabatic shear band, and that cell structures were formed in the shear band flank by partitioning elongated ferrites. These phenomena were explained by dynamic recovery and recrystallization due to the highly localized plastic deformation and temperature rise occurring in the shear band. The temperature rise in the shear band formation process was estimated to be above 540 degrees C by observing spheroidized cementites inside pearlite grains. (c) 2006 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0921509306017989https://repository.hanyang.ac.kr/handle/20.500.11754/108966
ISSN
0921-5093; 1873-4936
DOI
10.1016/j.msea.2006.08.045
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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