Ferrite grain coarsening during transformation of thermomechanically processed C–Mn–Nb austenite
作者:
PriestnerR.,
HodgsonP. D.,
期刊:
Materials Science and Technology
(Taylor Available online 1992)
卷期:
Volume 8,
issue 10
页码: 849-854
ISSN:0267-0836
年代: 1992
DOI:10.1179/mst.1992.8.10.849
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractThe ferrite grain size of low carbon steel is known to be refined by hot rolling in the austenite phase field at temperatures too low for recrystallisation to occur. The strain thus retained in the austenite increases ferrite nucleation density and in current models of grain refinement it is assumed that each nucleus becomes a grain in the fully transformed microstructure. In this paper it is shown that, in a heavily deformed C–Mn–Nb austenite, ferrite grains impinged, then coarsened during the initial stages of transformation during continuous cooling. The final ferrite grain size was not established until 35% of transformation had occurred. It is suggested, firstly, that ferrite grain refinement due to controlled rolling cannot be modelled simply from observed increases in nucleation density and, secondly, that deformation of austenite has considerably greater potential for grain refinement than is commonly observed, provided that coarsening of the ferrite during transformation can be limited.MST/1722
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