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Acta Metall Sin  2012, Vol. 48 Issue (10): 1160-1165    DOI: 10.3724/SP.J.1037.2012.00364
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BEHAVIOUR AND MECHANISM OF STRAIN HARDENING FOR DUAL PHASE STEEL DP1180 UNDER HIGH STRAIN RATE DEFORMATION
DAI Qifeng 1, SONG Renbo 1, FAN Wuyan 1, GUO Zhifei 1,2, GUAN Xiaoxia 1
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2. Shougang Research Institute of Technology, Beijing 100043
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Abstract  

Strain hardening behaviour and mechanism of a cold–rolled dual phase steel DP1180 under quasi–static tensile condition at a strain rate of 0.001 s−1 by electronic universal testing machine, and dynamic tensile condition at strain rates of 500 and 1750 s−1 by split Hopkinson tensile bar (SHTB) apparatus were systematically studied. According to the modified Swift true strain–stress model, the experimental data was regressed by using nonlinear fitting method, and strain hardening exponent in the modified Swift model was calculated by a modified Crussard–Jaoul method. The results revealed that there are two stage strain hardening characteristics of DP1180 steel at the strain rate range of 0.001—1750 s−1, the strain hardening ability of the stage I was enhanced with increase of strain rate, while the strain hardening ability of the stage II was weakened, and the transition strain was decreased. The ferrite near the martensite regions formed cell blocks with dislocation structures, with a size of 90 nm, due to the limit of deformation compatibility,  and the existence of geometrically necessary boundary (GNB) made DP1180 steel not instantly damaged under deformation at high strain rates. In addition, the adiabatic temperature rise of ΔT=103  ℃ made martensite easy to have plastic deformation at a strain rate of 1750 s−1.

Key words:  dual phase steel      high strain rate      strain hardening      modified Crussard--Jaoul analysis      geometrically necessary boundary     
Received:  20 June 2012     
ZTFLH:  TG142. 41  
Fund: 

Supported by High Technology Research and Development Program of China (No.2009AA03Z518) and Basic Theory Research Fund of Engineering Research Institute of USTB (No.YJ2010–006)

Corresponding Authors:  SONG Ren-Bo     E-mail:  songrb@mater.ustb.edu.cn

Cite this article: 

DAI Qifeng SONG Renbo FAN Wuyan GUO Zhifei GUAN Xiaoxia. BEHAVIOUR AND MECHANISM OF STRAIN HARDENING FOR DUAL PHASE STEEL DP1180 UNDER HIGH STRAIN RATE DEFORMATION. Acta Metall Sin, 2012, 48(10): 1160-1165.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00364     OR     https://www.ams.org.cn/EN/Y2012/V48/I10/1160

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