In this work, we used Dislocation Dynamics (DD) simulations to investigate the role of the hierarchical defects microstructure of ferritic-martensitic steel Eurofer97 in determining its hardening behavior. A Representative Volume Element (RVE) for DD simulation is identified based on the typical martensitic lath size. Material properties for DD simulations in b.c.c Eurofer97 are determined, including the dislocation mobility parameters. The dependence of material parameters on temperature is fitted to experimental yield strength measurements carried out at room temperature and 330 °C, respectively. Voids and precipitates observed in the microstructure, such as M₂₃C₆ and Tantalum-rich MX, are considered in our DD simulations as inclusions with realistic size distribution and volume density, while 〈1 1 1〉 -and 〈1 0 0〉 -type irradiation loops are included directly in the DD simulations. The lath structure, together with its typical precipitates arrangement and the different crystallographic orientation of the martensitic blocks can also be captured in the simulations. DD simulations are used to extract microstructure-specific hardening parameters, which can be used to simulate the properties of Eurofer97 at the engineering scale.

在这项工作中，我们使用位错动力学（DD）模拟来研究铁素体-马氏体钢Eurofer97的分层缺陷微观结构在确定其硬化行为中的作用。基于典型的马氏体板条尺寸，确定了用于DD模拟的代表性体积元（RVE）。确定了密件抄送Eurofer97中DD模拟的材料属性，包括位错迁移率参数。材料参数对温度的依赖性分别适合于在室温和330°C下进行的实验屈服强度测量。在微观结构中观察到的空隙和沉淀物，例如M ₂₃ C ₆在我们的DD模拟中，我们将D2和Tantalum-rich MX视为具有实际尺寸分布和体积密度的夹杂物，而DD模拟中直接包括了<1 1 1>和<1 0 0>型辐照回路。板条结构及其典型的析出物排列和马氏体块的不同晶体学取向也可以在模拟中捕获。DD模拟用于提取微结构特定的硬化参数，这些参数可用于在工程规模上模拟Eurofer97的特性。