Strain Hardening Behavior of High Performance FBDP,TRIP and TWIP Steels |
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Authors: | Ming‐hui Cai Hua Ding Zheng‐you Tang Hua‐ying Lee Young‐kook Lee |
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Affiliation: | 1. Department of Materials Science and Engineering, Yonsei University, Seoul 120‐749, Korea;2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China |
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Abstract: | 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. |
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Keywords: | Ferrite‐bainite dual phase (FBDP) steel transformation‐induced plasticity (TRIP) steel twin‐induced plasticity (TWIP) steel instantaneous n value strain hardening rate |
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