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Microstructure and Properties of Ultra-high Strength Ferrite-martensite Dual Phase Steel Tested Under Dynamic Tensile Conditions |
DAI Qi-feng, SONG Ren-bo, GUAN Xiao-xia |
School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China |
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Abstract Two groups of experimental dual phase (DP) steels with the same ferrite grain size and different martensite volume fraction were obtained through performing the experiment of step quenching (SQ) continuous annealing. The quasi-static tensile experiment and the dynamic tensile experiment for the two groups of DP steels were carried out at room temperature using universal testing machine CMT-4105 at strain rate of 10-4s-1 and split Hopkinson tensile bar (SHTB) at strain rate of 500s-1 and 2250s-1, respectively. Effect of high strain rate deformation on microstructure and properties of ultra-high strength ferrite-martensite dual phase steel tested under dynamic tensile conditions was investigated using the dynamic factor and Feret ratio quantitative analysis method. The results show that strain rate effect plays a role of strengthening for dynamic deformation behavior of dual phase steel; that strain rate sensitivity of dual phase steel increases with the decreasing of martensite volume fraction; that strain rate sensitivity of proof strength of ultra-high strength dual phase steels is greater than that of tensile strength. Adiabatic temperature rise which is calculated of the two kind of dual phase steels under 2250s-1 strain rate dynamic tensile conditions was 98K and 89K, and it counteracts the strengthening effect of strain rate.
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Received: 10 April 2012
Published: 20 April 2013
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