Metallurgical Interpretation on Grain Refinement and Synergistic Effect of Mn and Ti in Ti-microalloyed Strip Produced by TSCR

The grain refinement mechanism and synergistic effect of Mn and Ti involved in the Ti-microalloying technology of thin slab casting and direct rolling (TSCR) were elucidated. Because the inevitable precipitation of TiN in high Ti-containing liquid steel decreases the volume fraction of TiN precipita...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2014, Vol.21 (1), p.30-40
Main Authors: MAO, Xin-ping, CHEN, Qi-lin, SUN, Xin-jun
Format: Article
Language:English
Subjects:
Applied and Technical Physics
direct rolling
Engineering
Ferrite
Grain refinement
Iron and steel industry
Machines
Manganese
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
precipitation
Processes
Steels
Synergistic effect
thin slab casting
Ti-microalloying
TiN粒子
Titanium
Titanium nitride
TSCR
协同效应
晶粒细化机制
生产
薄板坯连铸连轧
钛微合金化
铁素体晶粒
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Summary:The grain refinement mechanism and synergistic effect of Mn and Ti involved in the Ti-microalloying technology of thin slab casting and direct rolling (TSCR) were elucidated. Because the inevitable precipitation of TiN in high Ti-containing liquid steel decreases the volume fraction of TiN precipitated from austenite and the rapid coarsening rate leads to a large size of TiN particles, a relatively weak inhibition effect on the recrystallized grain growth was obtained compared with that in the low Ti-containing steel. However, the ferrite grain size in high Ti-containing steel can be refined by the so-called non-recrystallization rolling. The complex addition of Mn and Ti can improve the strength and toughness of strip remarkably, and the mechanisms are that Mn decreases the transformation temperature, refines the ferrite grains, and enhances the formation of bainite and TiC precipitation in ferrite.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(14)60006-6