Effect of deformation path on microstructure, microhardness and texture evolution of interstitial free steel fabricated by differential speed rolling

Title
Effect of deformation path on microstructure, microhardness and texture evolution of interstitial free steel fabricated by differential speed rolling
Author(s)
고영건코티바하마드정봉권
Keywords
HIGH-PRESSURE TORSION; AZ31 MAGNESIUM ALLOY; MECHANICAL-PROPERTIES; GRAIN-REFINEMENT; IF-STEEL; ROOM-TEMPERATURE; MG-3AL-1ZN ALLOY; STAINLESS-STEEL; PRINCIPLES; RATIO
Issue Date
201408
Publisher
ELSEVIER SCIENCE INC
Citation
MATERIALS CHARACTERIZATION, v.94, pp.203 - 214
Abstract
This paper reports the effect of the deformation path on the microstructure, microhardness, and texture evolution of interstitial free (IF) steel processed by differential speed rolling (DSR) method. For this purpose, total height reductions of 50% and 75% were imposed on the samples by a series of differential speed rolling operations with various height reductions per pass (deformation levels) ranging from 10 to 50% under a fixed roll speed ratio of 1:4 for the upper and lower rolls, respectively. Microstructural observations using transmission electron microscopy and electron backscattered diffraction measurements showed that the samples rolled at deformation level of 50% had the finest mean grain size (similar to 0.5 mu m) compared to the other counterparts; also the samples rolled at deformation level of 50% showed a more uniform microstructure. Based on the microhardness measurements along the thickness direction of the deformed samples, gradual evolution of the microhardness value and its homogeneity was observed with the increase of the deformation level per pass. Texture analysis showed that, as the deformation level per pass increased, the fraction of alpha fiber and gamma fiber in the deformed samples increased. The textures obtained by the differential speed rolling process under the lubricated condition would be equivalent to those obtained by the conventional rolling. (C) 2014 Elsevier Inc. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/31256http://dx.doi.org/10.1016/j.matchar.2014.05.019
ISSN
1044-5803
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공과대학 > 신소재공학부 > Articles
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