Role of rolling temperature in the precipitation hardening characteristics of Ti–Mo microalloyed hot-rolled high strength steel

Rolling temperature was found to play a decisive role in the precipitation hardening of Ti–Mo microalloyed hot-rolled high strength steel, despite identical chemical composition and phase transformation condition. The different microstructural features of prior austenite grain structure and dislocat...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-10, Vol.615, p.255-261
Main Authors: Woo Kim, Yong, Hong, Seong-Gu, Huh, Yong-Hak, Lee, Chong Soo
Format: Article
Language:English
Subjects:
Austenite
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
Dislocations
Exact sciences and technology
High strength low alloy (HSLA) steel
High strength steels
Hot rolling
Interphase precipitation
Materials science
Microstructure
Nanometer-sized carbide
Nanostructure
Other heat and thermomechanical treatments
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Precipitation hardening
Solid solution, precipitation, and dispersion hardening
aging
Thermomechanical controlled processing (TMCP)
Titanium
Treatment of materials and its effects on microstructure and properties
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Summary:Rolling temperature was found to play a decisive role in the precipitation hardening of Ti–Mo microalloyed hot-rolled high strength steel, despite identical chemical composition and phase transformation condition. The different microstructural features of prior austenite grain structure and dislocation structures inside austenite and/or ferrite grain, and the change of austenite/ferrite phase transformation characteristic, depending on rolling temperature, significantly influenced the precipitation characteristics of interphase-precipitated nanometer-sized carbides and consequently led to a totally different precipitation hardening effect.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.07.077