Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 565, Issue -, Pages 430-438Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.12.055
Keywords
Hot-rolled high strength sheet steel; Thermomechanical controlled processing (TMCP); Grain refinement; Nano-sized carbide; Dislocation
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Funding
- Cooperative Research Project [B551179-12-05-00]
- Korea Research Council of Fundamental Science and Technology (KRCF)
- National Research Council of Science & Technology (NST), Republic of Korea [k13014] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A new Ti and Mo micro-alloyed hot-rolled high strength sheet steel was developed by controlling thermomechanical controlled processing (TMCP) schedule, in particular focusing on rolling and coiling temperatures. The results revealed that the steels developed were strengthened mostly by a combined effect of ferrite (alpha) grain refinement and precipitation hardening. The rolling at austenite (gamma) non-recrystallization region provided desirable features by introducing an accumulation of local strains (i.e., dislocations), which served as nucleation sites for gamma ->alpha transformation during coiling process, making ferrite grain more fine and homogeneous, although the precipitation hardening was somewhat weakened due to the precipitation of large (Ti, Mo)C carbides (i.e., gamma region precipitation). Moreover, these fine and homogeneous ferrite grain, and well developed dislocation structure improved impact properties. The TMCP schedule of the rolling at gamma non-recrystallization region (final rolling temperature of 880 degrees C) and coiling at 620 degrees C was found to provide an attractive combination of tensile and impact properties. (C) 2012 Elsevier B.V. All rights reserved.
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