Irradiation Assisted Stress Corrosion Cracking (IASCC) is a complex phenomenon of degradation which can have a significant influence on maintenance time and cost of core internals of a Pressurized Water Reactor (PWR). Hence, it is an issue of concern, especially in the context of lifetime extension of PWRs. Proton irradiation is generally used as a representative alternative of neutron irradiation to improve the current understanding of the mechanisms involved in IASCC. This study assesses the possibility of using heavy ions irradiation to evaluate IASCC mechanisms by comparing the irradiation induced modifications (in microstructure and mechanical properties) and cracking susceptibility of SA 304 L after both type of irradiations: Fe irradiation at 450 °C and proton irradiation at 350 °C. Irradiation-induced defects are characterized and quantified along with nano-hardness measurements, showing a correlation between irradiation hardening and density of Frank loops that is well captured by Orowan's formula. Both irradiations (iron and proton) increase the susceptibility of SA 304 L to intergranular cracking on subjection to Constant Extension Rate Tensile tests (CERT) in simulated nominal PWR primary water environment at 340 °C. For these conditions, cracking susceptibility is found to be quantitatively similar for both irradiations, despite significant differences in hardening and degree of localization.

辐照辅助应力腐蚀开裂（IASCC）是一种复杂的降解现象，会对压水堆（PWR）的维护时间和堆芯内部成本产生重大影响。因此，这是一个值得关注的问题，特别是在PWR的使用寿命延长的情况下。质子辐照通常被用作中子辐照的代表性替代方法，以提高对IASCC所涉及机理的当前理解。这项研究通过比较两种辐照后的辐照引起的改性（微观结构和机械性能）和SA 304 L的开裂敏感性（通过450°C的铁辐照和在450°C的质子辐照）来评估使用重离子辐照评估IASCC机理的可能性。 350℃。辐照引起的缺陷与纳米硬度测量一起进行了表征和量化，显示了辐照硬化与Frank环密度之间的相关性，该相关性已被Orowan公式很好地捕获了。在340°C的模拟标称PWR初级水环境中进行恒定延伸率拉伸试验（CERT）时，两种辐照（铁和质子）均增加了SA 304 L对晶间裂纹的敏感性。对于这些条件，尽管硬化和局部化程度存在显着差异，但两种辐照的裂纹敏感性在数量上都是相似的。在340°C的模拟标称PWR初级水环境中进行恒定延伸率拉伸试验（CERT）时，两种辐照（铁和质子）均增加了SA 304 L对晶间裂纹的敏感性。对于这些条件，尽管硬化和局部化程度存在显着差异，但两种辐照的裂纹敏感性在数量上都是相似的。在340°C的模拟标称PWR初级水环境中进行恒定延伸率拉伸试验（CERT）时，两种辐照（铁和质子）均增加了SA 304 L对晶间裂纹的敏感性。对于这些条件，尽管硬化和局部化程度存在显着差异，但两种辐照的裂纹敏感性在数量上都是相似的。