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| Tensile Mechanical Behaviour of Ultra-High Strength Cold Rolled Dual Phase Steel DP1000 at High Strain Rates |
| DAI Qifeng1, SONG Renbo1**, CAI Hengjun1, 2, YU Sanchuan1, GAO Zhe1 |
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2. Cold Rolling Department of Ansteel, Anshan 114021 |
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Cite this article:
DAI Qifeng,SONG Renbo**,CAI Hengjun,YU Sanchuan,GAO Zhe. Tensile Mechanical Behaviour of Ultra-High Strength Cold Rolled Dual Phase Steel DP1000 at High Strain Rates. Chinese Journal of Materials Research, 2013, 27(1): 25-31.
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Abstract ABSTRACT Quasi-static and dynamic tensile mechanical behaviour of ultra-high strength cold rolled dual phase steel DP1000 at room temperature and wide strain rates (0.0001-2250 s-1) with electronic universal testing machine CMT4105 and split Hopkinson tensile bar (SHTB) apparatus were investigated. The results show that DP1000 steel is a sensitive material to strain rate, and the strength increases with the increase of strain rate; Johnson-Cook model can represent, to some extent, deformational behaviour for DP1000 steel at high strain rates, but owing to strain rate sensitivity, the goodness of fit is poor at high strain rate. The polynomial of strain rate effect was modified based on Johnson-Cook model, and the modified dynamic constitutive model can make a satisfied prediction to the plastic flow stress of DP1000 steel at high strain rates, and the average coefficient of determination can be improved from 0.9434 to 0.9850.
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