超高强铁素体-马氏体双相钢在动态拉伸变形条件下组织和性能研究

doi:10.3969/j.issn.1001-4381.2013.04.002

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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.

Key words： dynamic tensile testing microstructure dual phase steel strain rate sensitivity

Received: 10 April 2012 Published: 20 April 2013

ZTFLH:	TG156.1
	TG113.1

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	Articles by authors
	DAI Qi-feng
	SONG Ren-bo
	GUAN Xiao-xia

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DAI Qi-feng,SONG Ren-bo,GUAN Xiao-xia. Microstructure and Properties of Ultra-high Strength Ferrite-martensite Dual Phase Steel Tested Under Dynamic Tensile Conditions[J]. Journal of Materials Engineering, 2013, 0(4): 6-11.

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http://jme.biam.ac.cn/EN/10.3969/j.issn.1001-4381.2013.04.002 OR http://jme.biam.ac.cn/EN/Y2013/V0/I4/6

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