Strain Hardening Behavior of High Performance FBDP, TRIP and TWIP Steels

Based on n‐value differential equation and microstructural observation, strain hardening behaviors of FBDP, TRIP, and TWIP steels during uniaxial tension were investigated. TRIP steel exhibits both superior strength and ductility than FBDP steel, and TWIP steel displays much higher total and uniform...

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Bibliographic Details
Published in:Steel research international 2011-03, Vol.82 (3), p.242-248
Main Authors: Cai, Ming-hui, Ding, Hua, Tang, Zheng-you, Lee, Hua-ying, Lee, Young-kook
Format: Article
Language:English
Subjects:
Differential equations
Displays
Elongation
Ferrite-bainite dual phase (FBDP) steel
instantaneous n value
Steels
Strain
Strain hardening
strain hardening rate
transformation-induced plasticity (TRIP) steel
TRIP steels
twin-induced plasticity (TWIP) steel
TWIP steels
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Summary:Based on n‐value differential equation and microstructural observation, strain hardening behaviors of FBDP, TRIP, and TWIP steels during uniaxial tension were investigated. TRIP steel exhibits both superior strength and ductility than FBDP steel, and TWIP steel displays much higher total and uniform elongations in comparison to FBDP and TRIP steels. The instantaneous n values of FBDP and TRIP steels increase at small strains, reach a maximum value, smoothly decrease at higher strains, and then rapidly drop up to the specimen rupture. The strain hardening of TRIP steel persists at higher strains where that of FBDP steel begins to diminish. TWIP steel exhibits gradually increased instantaneous n values over the whole uniform plastic deformation, implying that TWIP steel shows a much larger strain hardening capability than FBDP and TRIP steels.
ISSN:1611-3683
1869-344X
1869-344X
DOI:10.1002/srin.201000132