Damage in dual phase steel DP1000 investigated using digital image correlation and microstructure simulation
Damage in dual phase steel DP1000 investigated using digital image correlation and microstructure simulation
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DOI：
10.1088/0965-0393/23/8/085005
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发表时间：
2015-12-01
影响因子：
1.8
通讯作者：
Pinna, Christophe
中科院分区：
文献类型：
--
作者：
Alharbi, Khaled;Ghadbeigi, Hassan;Pinna, Christophe
采用扫描电子显微镜（SEM）原位拉伸试验、数字图像相关分析（DIC）和有限元（FE）模拟相结合的方法，研究了双相钢在变形过程中的微观组织破坏机制和孔洞形核。在原位测试过程中获得的SEM图像被用来跟踪DP1000钢的微观结构内的损伤的演变。根据这些图像，使用DIC生成应变图，并将其用作FE模型的边界条件，以研究马氏体相开裂开始前马氏体和铁素体的应力状态。基于模拟结果，已估计约1700 MPa的最大主应力的裂纹萌生在所研究的DP1000钢的马氏体。结合有限元分析的SEM图像观察提供了新的见解DP钢的物理损伤模型的发展。
Microstructure failure mechanisms and void nucleation in dual-phase (DP) steels during deformation have been studied using a combination of in situ tensile testing in a scanning electron microscope (SEM), digital image correlation (DIC) and finite element (FE) modelling. SEM images acquired during in situ tests were used to follow the evolution of damage within the microstructure of a DP1000 steel. From these images, strain maps were generated using DIC and used as boundary conditions for a FE model to investigate the stress state of martensite and ferrite before the onset of the martensite phase cracking. Based on the simulation results, a maximum principal stress of about 1700 MPa has been estimated for crack initiation in the martensite of the investigated DP1000 steel. The SEM image observations in combination with the FE analyses provide new insights for the development of physically-based damage models for DP-steels.