Full-Field Quantitative Determination of Strain and Stress Partitioning in Medium Mn TRIP Steels
Full-Field Quantitative Determination of Strain and Stress Partitioning in Medium Mn TRIP Steels
复制标题
DOI：
10.1007/s12540-023-01542-3
复制
发表时间：
2023-10
影响因子：
3.5
通讯作者：
Xiangbo Hu;Chenghuan Liu;Xiaogang Wang;Chao Jiang
中科院分区：
文献类型：
--
作者：
Xiangbo Hu;Chenghuan Liu;Xiaogang Wang;Chao Jiang
提出了一种定量测定具有典型铁素体-奥氏体双相组织的中锰相变诱发塑性（TRIP）钢中应变和应力分配的新方法。首先，基于扫描电子显微镜（SEM）成像，拉伸变形过程中的试样表面的应变场，可以得到一个发展的显微数字图像相关（DIC）方法。从应变场中可以识别出相变后的铁素体、奥氏体和初生马氏体等不同相，从而可以通过实验解决相间的应变分配问题。其次，在应力分配方面，建立了各相的本构模型，并在混合律和等功律的前提下，采用适当的回归方法对模型参数进行了辨识。最后，应变和应力可以在相位水平上同时计算。结果表明，不同相的应变分布和应力分布存在明显的不均匀性。所提出的方法允许提供有价值的信息，用于评估不同相的重量，以有助于多相钢的宏观机械性能，如强度和延展性。这种方法也可以用来模拟中锰TRIP钢在不同的奥氏体稳定性和不同的初始体积分数的奥氏体的机械响应，因此，通过微观结构tuning.Graphical AbstractFull-field定量测定中锰TRIP钢中的应变和应力分配的改善材料性能的巨大潜力。
The aim of this paper is to present a new method for the quantitative determination of strain and stress partitioning in medium Mn transformation-induced plasticity (TRIP) steels with typical ferrite–austenite dual-phase microstructures. Firstly, based on scanning electron microscope (SEM) imaging, the strain field of the specimen surface during tensile deformation can be obtained using a developed microscopic digital image correlation (DIC) method. The different phases involving ferrite, austenite and nascent martensite after transformation are recognizable from the strain field, then the strain partitioning between phases can be solved experimentally. Secondly, regarding the stress partitioning, the constitutive models of the phases involved are established, and the relevant model parameters are identified using a proper regression method under the premise of the law of mixture and the iso-work law. Finally, strain and stress can be computed simultaneously at the phase level. The results show that there is significant inhomogeneity in the distribution of strain in different phases, as well as the distribution of stress. The proposed method allows providing valuable information for assessing the weight of different phases in contributing to the macroscopic mechanical properties of multi-phase steels, such as strength and ductility. This method can also be used to simulate the mechanical response of medium Mn TRIP steels at different austenite stabilities and different initial volume fractions of austenite, indicating therefore a great potential for improving material properties via microstructural tuning.Graphical AbstractFull-field quantitative determination of strain and stress partitioning in medium Mn TRIP steels.