DP1180双相钢在高应变速率变形条件下应变硬化行为及机制
收稿日期: 2012-06-20
修回日期: 2012-07-10
网络出版日期: 2012-10-11
基金资助
国家高技术研究发展计划项目2009AA03Z518和北京科技大学冶金工程研究院基础理论研究基金项目YJ2010--006资助
BEHAVIOUR AND MECHANISM OF STRAIN HARDENING FOR DUAL PHASE STEEL DP1180 UNDER HIGH STRAIN RATE DEFORMATION
Received date: 2012-06-20
Revised date: 2012-07-10
Online published: 2012-10-11
Supported by
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)
利用电子万能试验机和分离式Hopkinson拉杆装置对DP1180冷轧双相钢分别进行应变速率为0.001 s-1和500, 1750 s-1的准静态和动态拉伸实验, 根据修正的Swift真应力--应变模型对实验数据进行了非线性拟合, 并用修正的Crussard--Jaoul分析法计算出修正的Swift模型的应变硬化指数. 结果表明: 在准静态和动态拉伸下, 都存在两阶段应变硬化特性, 第一阶段随应变速率的增加应变硬化能力增强; 第二阶段随应变速率的增加应变硬化能力减弱; 转折应变随应变速率的增加从3.12%减小到1.28%. 在高应变速率下, 马氏体附近的铁素体由于受到变形协调性的限制, 形成位错结构胞块, 其尺寸可达约90 nm, 而且几何必需边界(GNB)的存在使得DP1180双相钢在高应变速率下变形过程中不至于瞬间破坏; 在应变速率为1750 s-1时, 绝热温升Δ T=103 ℃使得马氏体更容易发生塑性变形.
关键词： 双相钢; 高应变速率; 应变硬化; 修正的Crussard--Jaoul分析法; 几何必需边界
代启锋 宋仁伯 范午言 郭志飞 关小霞 . DP1180双相钢在高应变速率变形条件下应变硬化行为及机制[J]. 金属学报, 2012 , 48(10) : 1160 -1165 . DOI: 10.3724/SP.J.1037.2012.00364
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.
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