Local plastic strain evolution in a high strength dual-phase steel
Local plastic strain evolution in a high strength dual-phase steel
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DOI：
10.1016/j.msea.2010.04.052
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发表时间：
2010-07-15
期刊：
影响因子：
6.4
通讯作者：
Yates, J. R.
中科院分区：
文献类型：
--
作者：
Ghadbeigi, H.;Pinna, C.;Yates, J. R.
采用数字图像相关技术和扫描电镜原位拉伸试验研究了双相钢局部塑性变形的演化过程。使用专门设计的样品进行测试，通过测量微观结构尺度上的应变来研究DP 1000钢中损伤的起始和演变。在整个拉伸试验的不同阶段使用DIC分析显微照片，以测量铁素体-马氏体显微组织内的局部应变分布。结果表明，逐渐局部化的变形成带取向在45度相对于加载方向。铁素体相中的应变幅度较高，局部值高达120%。损伤引发的几种机制被确定和相关的局部应变在这种钢。在这项工作中所使用的程序和获得的结果可能有助于旨在预测新一代汽车钢的性能的模型的开发。(C)2010 Elsevier B. V.保留所有权利。
The evolution of local plastic deformation in a dual-phase (DP) steel has been studied using Digital Image Correlation (DIC) and in-situ tensile testing inside a scanning electron microscope. Tests were performed using specially designed samples to study the initiation and evolution of damage in DP1000 steel by measuring the strains at the scale of the microstructure. Micrographs have been analysed using DIC at different stages throughout a tensile test to measure local strain distributions within the ferrite-martensite microstructure. The results show progressive localisation of deformation into bands orientated at 45 degrees with respect to the loading direction. Strain magnitudes are higher in the ferrite phase with local values reaching up to 120%. Several mechanisms for damage initiation are identified and related to the local strains in this steel. The procedure used and the results obtained in this work may help the development of models aimed at predicting the properties of new generation automotive steels. (C) 2010 Elsevier B.V. All rights reserved.