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  

Microstructure and Properties of Ultra-high Strength Ferrite-martensite Dual Phase Steel Tested Under Dynamic Tensile Conditions

作　　者：代启锋[1] 宋仁伯[1] 关小霞[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2013年第4期6-11,共6页Journal of Materials Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA03Z518);北京科技大学冶金工程研究院基础理论研究基金资助项目(YJ2010-006)

摘　　要：通过分段淬火连续退火实验,获得两组铁素体晶粒尺寸大致相同、马氏体体积分数不同的双相钢。选取应变速率为10-4s-1进行准静态拉伸实验;选取应变速率为500s-1和2250s-1在分离式霍普金森拉杆技术进行动态拉伸实验。利用动态因子、Feret比率等定量分析方法研究超高强铁素体-马氏体双相钢在动态拉伸变形条件下的组织和性能。结果表明:应变速率效应在双相钢的动态变形行为中主要起强化作用;马氏体体积分数越低的双相钢应变速率敏感性越大;相比抗拉强度而言,超高强冷轧双相钢屈服强度的应变速率敏感性更大。计算在应变速率为2250s-1动态拉伸变形下产生绝热温升分别为98K和89K,并抵消部分应变速率强化作用。Two groups of experimental dual phase （DP） steels with the same ferrite grain size and dif- ferent 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 in- vestigated 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.

关 键 词：动态拉伸实验 微观组织 双相钢 应变速率敏感性 

分 类 号：TG156.1[金属学及工艺—热处理] TG113.1[金属学及工艺—金属学]