FE modelling of bainitic steels using crystal plasticity
FE modelling of bainitic steels using crystal plasticity
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DOI：
10.1080/14786430802566380
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发表时间：
2008-01-01
影响因子：
1.6
通讯作者：
Cailletaud, G.
中科院分区：
文献类型：
--
作者：
Osipov, N.;Gourgues-Lorenzon, A. -F.;Cailletaud, G.
用来描述核电站脆性断裂概率的经典模型是在宏观尺度上编写的。这种方法不能自然地捕获物理现象，因此这些模型远离其识别域(如温度历史、加载路径)的应用可能会变得有问题。为了提高抗力和寿命预测的质量，必须考虑描述材料的非均匀特性及其变形机制的微观结构信息。本工作的目的是提出一个能够描述A508CL3贝氏体钢的局部应力和应变场的模型。然后，这些信息将被用来为多尺度失效模型引入关键变量。A508CL3钢的显微组织由非随机取向的贝氏体包(来自原奥氏体晶)组成。一个准确的模型必须考虑实际的微观组织，以便提供真实的局部应力和应变场。本文从贝氏体微结构的实验观察(织构测量、形态分析)出发，首先提出了一个能够产生具有定量代表性的数值集合体的数值模型，然后讨论了对考虑晶体塑性的集合体进行有限元处理所得到的结果。
Models classically used to describe the probability of brittle fracture in nuclear power plants are written on a macroscale. Physical phenomena are not naturally captured by this type of approach, so that application of these models far from their identification domain (such as temperature history, loading path) may become questionable. To improve the quality of the prediction of resistance and life time, microstructural information describing the heterogeneous character of the material and its deformation mechanisms has to be taken into consideration. The objective of this work is to propose a model able to describe local stress and strain fields in an A508 Cl3 bainitic steel. This information will then be used to introduce critical variables for multiscale failure models. The microstructure of A508 Cl3 steel is made of bainitic packets (coming from former austenitic grains), which are not randomly oriented. An accurate model must take the actual microstructure into account, in order to provide realistic local stress and strain fields. Starting from experimental observations of the bainitic microstructure (texture measurements, morphological analysis), the paper first proposes a numerical model able to produce quantitatively representative numerical aggregates, then discusses the results obtained by a finite element treatment of the aggregates involving crystal plasticity.