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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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-10, Vol.615, p.255-261
Hauptverfasser:	Woo Kim, Yong, Hong, Seong-Gu, Huh, Yong-Hak, Lee, Chong Soo
Format:	Artikel
Sprache:	eng
Schlagworte:	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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Beschreibung
Zusammenfassung:	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