Dynamic Ferrite Transformation Behaviors in 6Ni-0.1C Steel

Title
Dynamic Ferrite Transformation Behaviors in 6Ni-0.1C Steel
Author(s)
박노근Lijia Zhao[Lijia Zhao]Akinobu Shibata[Akinobu Shibata]Nobuhiro Tsuji[Nobuhiro Tsuji]
Keywords
LOW-CARBON STEEL; STRAIN-INDUCED TRANSFORMATION; ULTRAFINE FERRITE; DEFORMATION; AUSTENITE; RECRYSTALLIZATION; TEMPERATURE; REFINEMENT; SIMULATION; EVOLUTION
Issue Date
201405
Publisher
SPRINGER
Citation
JOM, v.66, no.5, pp.765 - 773
Abstract
Phase transformation from austenite to ferrite is an important process to control the microstructures of steels. To obtain finer ferrite grains for enhancing its mechanical property, various thermomechanical processes followed by static ferrite transformation have been carried out for austenite phase. This article reviews the dynamic transformation (DT), in which ferrite transforms during deformation of austenite, in a 6Ni-0.1C steel recently studied by the authors. Softening of flow stress was caused by DT, and it was interpreted through a true stress-true strain curve analysis. This analysis predicted the formation of ferrite grains even above the Ae(3) temperature (ortho-equilibrium transformation temperature between austenite and ferrite), where austenite is stable thermodynamically, under some deformation conditions, and the occurrence of DT above Ae(3) was experimentally confirmed. Moreover, the change in ferrite grain size in DT was determined by deformation condition, i.e., deformation temperature and strain rate at a certain strain, and ultrafine ferrite grains with a mean grain size of 1 mu m were obtained through DT with subsequent dynamic recrystallization of ferrite.
URI
http://hdl.handle.net/YU.REPOSITORY/32156http://dx.doi.org/10.1007/s11837-014-0913-3
ISSN
1047-4838
Appears in Collections:
공과대학 > 신소재공학부 > Articles
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