Annealing behavior of severely deformed IF steel via the differential speed rolling method

Title
Annealing behavior of severely deformed IF steel via the differential speed rolling method
Author(s)
고영건조단수하르토
Keywords
LOW-TEMPERATURE SUPERPLASTICITY; SEVERE PLASTIC-DEFORMATION; INTERSTITIAL-FREE STEEL; MECHANICAL-PROPERTIES; GRAIN-REFINEMENT; STORED ENERGY; PURITY IRON; ALLOY; ALUMINUM; MICROSTRUCTURE
Issue Date
201212
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.558, pp.90 - 94
Abstract
The present study was made to demonstrate the annealing behavior of severely deformed interstitial free (IF) steel processed by differential speed rolling (DSR). The initial ferrite grain size of approximate to 35 mu m was significantly refined to approximate to 0.7 mu m after four DSR operations corresponding to the effective strain of approximate to 1.7 under the roll speed ratio of 1:4 for lower and upper rolls. Microstructural observations revealed that most of the initial coarse ferrite grains were subdivided with an aid of dislocation activities, resulting in the formation of fine ferrite grains. During post-DSR annealing at 673-773 K, the grain size of the fine ferrite grains was observed to remain unchanged, which implied that static recovery was in progress. At 823 K, the microstructure exhibited the coarse recrystallized ferrite grains while the grain growth of ferrite grains started to take place above 873 K. Mechanical properties were also assessed by taking the annealing characteristics of the ultrafine grained IF steel into consideration. (C) 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/26848http://dx.doi.org/10.1016/j.msea.2012.07.081
ISSN
0921-5093
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공과대학 > 신소재공학부 > Articles
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