针对核电装备高温高压水腐蚀环境下的使役工况，研究奥氏体不锈钢焊接区机加工表面激光喷丸抗应力腐蚀改性机理与表面完整性控制方法。探索机械加工和激光喷丸对奥氏体不锈钢焊缝表面完整性状态的影响规律，阐明机械加工和激光喷丸过程中不锈钢焊接件表面及亚表面应力应变状态和微观组织结构的演化机理。开展核级不锈钢焊缝机加工表面激光喷丸强化的抗应力腐蚀改性实验与仿真分析，揭示应力腐蚀的裂纹萌生敏感性及裂纹扩展速率与奥氏体不锈钢焊接件塑性变形、表面硬化特征、残余应力状态、马氏体相变、晶粒细化程度的关联关系。基于"加工工艺参数-表面完整性状态-抗应力腐蚀性能"的内在特性，发展核级不锈钢焊接件改性制造的工艺规划方法，掌握核级不锈钢焊接件的抗应力腐蚀控性制造技术，满足同时具有控形和控性要求的核级不锈钢焊接件长寿命高可靠性要求。本项目的研究将丰富不锈钢激光喷丸抗应力腐蚀改性工艺理论，拓展激光冲击强化技术的应用领域。

In order to meet the requirement of long-life service of components in reliable nuclear reactor subjecting to high-temperature, high-pressure and corrosive water, the laser shock peening modification mechanism against stress corrosion cracking (SCC) and the control methodology of surface integrity for the machined stainless steel nuclear weldments are to be investigated.Firstly, the evolvement of microstructure and mechanical properties of the surface and subsurface due to machining and laser shock peening will be examined concerning structure, process and surface integrity of the stainless steel nuclear weldments. Then, the relationship between resistance to stress corrosion cracking and the surface integrity which is induced from machining and laser shock peening on weldments will be explored respectively by means of experiments and simulation. Followed, the relation model of crack initiation and crack propagation in SCC against surface integrity is to be established, with the consideration of plastic deformation, surface hardening, residual stress, martensitic transformation, grain refinement of machined stainless steel nuclear weldments. Finally, the optimal process plan for stainless steel nuclear weldments with machining and laser shock peening against SCC will be developed based on the relationship among process parameters, surface integrity and SCC behavior. The research will broaden the application of laser shock peening with the progress in fundamental exploration on anti-SCC modification mechanism.