9Cr-ODS合金焊接接头辐照损伤协调机制研究

9Cr-ODS friction stir welding joints are study target in this project. On the basis of comprehensive and systematic study of hardness and structure morphology of 9Cr-ODS friction stir welding joints in micro-zone, Fe+/He+ dual ion beams with different dosage are used to simulate irradiating experiments. Focusing on the extent of hardening for the joint micro-zones after irradiations, the irradiation hardening and irradiation creep coordination mechanism for the micro-zones of 9Cr-ODS friction stir welding joint are illuminated under complicated influence factors through advanced analysis and characterization approaches, such as transmission electron microscope (TEM), nano-indentor and neutron diffraction. Furthermore, the interactive function law of the complicated influence factors is clarified, and the irradiation damage mechanism with different dosage Fe+/He+ dual ion beams is illustrated. Eventually, the research results of this project can offer a theoretical prediction and scientific basis on manufacturing, chemical components optimization and data accumulation for the fuel cladding of the fourth generation nuclear power.

该项目以9Cr-ODS摩擦搅拌焊接头为研究对象，在全面系统研究接头各微区硬度、微观组织形貌的基础上，采用不同剂量的Fe+/He+双离子束进行辐照模拟实验，以接头不同微区辐照后硬化程度不同为切入点，采用透射电镜、纳米压痕、中子衍射等先进分析方法，研究复杂影响因素下Cr-ODS摩擦搅拌焊接头各个微区之间的辐照硬化协调机制及辐照蠕变协调机制，认识各复杂影响因素之间的相互作用规律，阐明不同剂量双束辐照后接头薄弱区域的辐照损伤机制。本项目的研究结果，可为第四代核电燃料包壳的加工制造、化学成分优化以及数据积累提供先期的理论预测与科学依据。