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Static and metadynamic recrystallization of interstitial free steels during hot deformation

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journal contribution
posted on 2004-01-01, 00:00 authored by S Zahiri, S Byon, S I Kim, Y Lee, Peter HodgsonPeter Hodgson
A rapid method was used to identify kinetics of the recrystallization for two IF (Interstitial Free) steels which have different phosphorous and boron contents. The static and metadynamic softening behaviour of the materials for a range of strain rates and temperatures were quantified. The critical strain for initiation of strain independent softening was estimated for the IF steels in respect to the time for 50 percent softening after deformation. The results showed that the strain for the initiation of strain independent softening (often referred to as metadynamic recrystallization) varies with the Zener Hollomon parameter. Classic static recrystallization was observed at strains below the strain independent softening for all processing conditions and the strain rate had a strong effect on the time for strain independent softening. Results also revealed that static and metadynamic recrystallization was delayed owing to the phosphorous and boron alloying elements. Hence, the large strain at above no-recrystallization temperature may be required for the early stage of Finishing Stands Unit (FSU) in hot strip rolling mills to initiate austenite grain refinement of phosphorous and boron added IF steels.

History

Journal

ISIJ international

Volume

44

Issue

11

Pagination

1918 - 1923

Publisher

Iron and Steel Institute of Japan

Location

Tokyo, Japan

ISSN

0915-1559

eISSN

1347-5460

Language

eng

Publication classification

C1 Refereed article in a scholarly journal; C Journal article

Copyright notice

2004, ISIJ