The influence of irradiation on the constitutive stress-strain response of A508-3 steel is investigated by a series of nano-indentation simulations with Crystal Plasticity Finite Element Model (CPFEM). In this regard, the crystal plasticity constitutive model based on the densities of dislocations and irradiation defects for body-centered cubic (BCC) crystal of concern is summarized and numerically implemented at first. Moreover, the method that converts hardness vs. half-angle (θ) into stress vs. strain is introduced briefly. Based on the model, numerical results are challenged in comparison with experimental data and found in excellent agreement with the reported results, from which, the validity is verified. Meanwhile, we further analyze the depth-dependent irradiation damage distribution of ion irradiation and offer the equivalent value of irradiation damage in terms of displacement per atom (dpa) in the uniform fashion, which can definitely deepen the comprehension of the depth-dependent irradiation hardening of ion-irradiated A508-3 steel and guide relevant experimental work.

通过一系列使用晶体塑性有限元模型（CPFEM）的纳米压痕模拟，研究了辐照对A508-3钢本构应力-应变响应的影响。在这方面，首先总结并以数值为基础，基于所关注的体心立方（BCC）晶体的位错密度和辐照缺陷的晶体可塑性本构模型。此外，将硬度与半角（θ）简要介绍应力与应变。基于该模型，数值结果与实验数据相比具有挑战性，并且与报道的结果非常吻合，从而验证了有效性。同时，我们进一步分析了离子辐照的深度依赖辐照损伤分布，并以均匀的单位原子位移（dpa）给出了辐照损伤的等效值，这无疑可以加深对深度依赖辐照硬化的理解。离子辐照A508-3钢的制造，并指导相关实验工作。