Ultrafine Grained Austenite in a Low Carbon Vanadium Microalloyed Steel

Ultrafine austenite grains with average size of 2μm were successfully obtained by combining thermo-mechanical control process followed by reheating in a vanadium microalloyed steel.The mixed microstructure transformed from pancaked austenite formed during controlled rolling has a higher density of h...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 20; no. 4; pp. 64 - 69
Main Authors YANG, Geng-wei, LI, Zhao-dong, SUN, Xin-jun, YONG, Xi, YONG, Qi-long
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 01.04.2013
Springer Singapore
Subjects
Applied and Technical Physics
Austenite
carbide
Controlled rolling
Density
Engineering
grain boundary
grain refining
Heating
Iron and steel industry
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Nanostructure
nucleation
Physical Chemistry
Processes
Reheating
TMCP
Vanadium
低碳
加热过程
奥氏体晶粒尺寸
奥氏体晶粒长大
热机械控制工艺
超细晶
钒微合金化钢
钒微合金钢
TMCP
nucleation
grain refining
grain boundary
carbide
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ISSN1006-706X
2210-3988
DOI10.1016/S1006-706X(13)60084-9

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Summary:Ultrafine austenite grains with average size of 2μm were successfully obtained by combining thermo-mechanical control process followed by reheating in a vanadium microalloyed steel.The mixed microstructure transformed from pancaked austenite formed during controlled rolling has a higher density of high angle boundaries,compared to that transformed from equiaxial austenite.It contributes to increasing nucleation density of austenite grain during the reheating process.A certain volume fraction of undissolved nano-sized（Ti,V）C particles,which are formed during the controlled rolling process and/or the reheating process,effectively inhibit austenite grain growth and consequently refine austenite grain size significantly.The critical grain size of austenite calculated by Gladman model agrees well with the experimental result.
Bibliography:TMCP grain refining grain boundary nucleation carbide
11-3678/TF
Ultrafine austenite grains with average size of 2μm were successfully obtained by combining thermo-mechanical control process followed by reheating in a vanadium microalloyed steel.The mixed microstructure transformed from pancaked austenite formed during controlled rolling has a higher density of high angle boundaries,compared to that transformed from equiaxial austenite.It contributes to increasing nucleation density of austenite grain during the reheating process.A certain volume fraction of undissolved nano-sized（Ti,V）C particles,which are formed during the controlled rolling process and/or the reheating process,effectively inhibit austenite grain growth and consequently refine austenite grain size significantly.The critical grain size of austenite calculated by Gladman model agrees well with the experimental result.
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ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(13)60084-9