Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 605, Issue -, Pages 244-252Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.03.054
Keywords
High strength low alloy (HSLA) steel; Thermomechanical controlled processing (TMCP); Rolling temperature; Grain refinement; Nanometer-sized carbide
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Funding
- POSCO
- Korea Research Council of Fundamental Science and Technology (KRCF)
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The effects of rolling condition on the microstructure and mechanical properties of Ti-Mo microalloyed hot-rolled high strength steel were investigated by varying rolling temperature from austenite recrystallization region to austenite+ferrite dual phase region. The results revealed that rolling temperature plays a decisive role in the mechanical properties by significantly affecting the characteristics of grain refinement and precipitation. Conducting the rolling in the regions through austenite recrystallization region to austenite non-recrystallization region was able to provide desirable microstructural features for impact properties as well as for strength by inducing a homogeneous and fine grain structure, well developed dislocation structures inside grain, and relatively high number density of fine carbides, although precipitation hardening effect was somewhat reduced by strain-induced precipitation. (C) 2014 Elsevier B.V. All rights reserved.
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