Determination of the critical parameters for the onset of dynamic recrystallization (DRX) in advanced ultrahigh strength steels (A-UHSS) microalloyed with boron
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Tipus de documentArticle
Data publicació2012
Condicions d'accésAccés obert
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Abstract
In this research work, the double differentiation mathematical method was used to identify more accurately the criti-
cal stress
ሺ
ߪ
)
and critical strain
ሺ
ߝ
)
associated with the onset of dynamic recrystallization (DRX), which is based on
changes of the strain hardening rate
)ߝ߲/ߪ߲ ൌ ߠሺ
as a function of the flow stress (Poliak and Jonas method, simplified by
Najafizadeh and Jonas). For this purpose, a low carbon advanced ultra-high strength steel (A-UHSS) microalloyed with
different amounts of boron (14, 33, 82, 126 and 214 ppm) was deformed by uniaxial hot-compression tests at high tempe-
ratures
1100 ݀݊ܽ ሺ950,1000,1050
°
)ܥ
and constant true strain rates
ሺ
10
ିଷ
,10
ିଶ
10 ݀݊ܽ
ିଵ
ݏ
ିଵ
)
. Results indicate that
both
ߪ
and
ߝ
increase with decreasing deformation temperature and in
creasing strain rate. On the other hand, these criti-
cal parameters tend to decrease as boron content increases. Such a behavior is attributed to a solute drag effect by boron
atoms on the austenitic grain boundaries and also to a solid solution softening effect.
CitacióAltamirano Guerrero, G.; Mejía Granados, I.; Cabrera, J. Determination of the critical parameters for the onset of dynamic recrystallization (DRX) in advanced ultrahigh strength steels (A-UHSS) microalloyed with boron. "Computer methods in materials science", 2012, vol. 12, núm. 3, p. 152-162.
ISSN1641-8581
Versió de l'editorhttp://www.cmms.agh.edu.pl/
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ALTAMIRANO (201 ... s for the onset of DRX.pdf | Article | 4,475Mb | Visualitza/Obre |