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首页> 外文期刊>Materials Science and Engineering >High strain rate tensile behavior of a quenching and partitioning (Q&P) Fe-0.25C-1.5Si-3.0Mn steel
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High strain rate tensile behavior of a quenching and partitioning (Q&P) Fe-0.25C-1.5Si-3.0Mn steel

机译：淬火和分配（Q＆P）Fe-0.25C-1.5Si-3.0Mn钢的高应变速率拉伸行为

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摘要

The mechanical behavior and microstructural evolution of a quenching and partitioning (Q&P) Fe-0.25C-1.5Si-3.0Mn (wt%) steel were investigated in a wide range of strain rates (10(-4)-10(3) s(-1)). The static tensile tests (10(-4) and 10(-2) s(-1)) were conducted using a universal testing machine, while high strain rate tests (500-1000 s(-1)) were carried out on a split Hopkinson tensile bar system. High speed camera imaging combined with the digital image correlation (DIC) technique were employed to study homogeneity of plastic deformation. Electron backscatter diffraction (EBSD) and scanning electron microscopy were used to characterize the microstructure evolution in the deformed zone and the fracture surface, respectively. The results indicate that the yield strength of the Q&P steel in dynamic tests (500-1000 s(-1)) is by 200 MPa higher compared to static tests (10(-4) and 10(-2) s(-1)), while the ultimate tensile strength tends to increase linearly with strain rate. The results of DIC analysis demonstrate that the homogeneity of plastic deformation is similar in static and dynamic test conditions. EBSD characterization shows that the retained austenite (RA) fraction decreases exponentially with the increase of plastic strain during both static and dynamic tensile testing. Additionally, examination of the fracture surfaces reveals the largest dimples in the statically tested specimens.
机译：研究了在宽应变率（10（-4）-10（3）s）范围内淬火和分配（Q＆P）Fe-0.25C-1.5Si-3.0Mn（wt％）钢的力学行为和微观结构演变（-1））。静态拉伸试验（10（-4）和10（-2）s（-1））是使用通用试验机进行的，而高应变速率试验（500-1000 s（-1））是在通用试验机上进行的拆分霍普金森拉伸杆系统。高速相机成像结合数字图像相关技术（DIC）被用来研究塑性变形的均匀性。利用电子背散射衍射（EBSD）和扫描电子显微镜分别表征了变形区和断口表面的显微组织演变。结果表明，与静态测试（10（-4）和10（-2）s（-1）相比，动态测试（500-1000 s（-1））中Q＆P钢的屈服强度高200 MPa。 ），而极限抗拉强度则倾向于随应变率线性增加。 DIC分析的结果表明，在静态和动态测试条件下，塑性变形的均匀性相似。 EBSD表征表明，在静态和动态拉伸试验中，残余奥氏体（RA）分数均随着塑性应变的增加而呈指数下降。另外，对断裂表面的检查发现在静态测试的样品中最大的凹坑。

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