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从宏观力学性能与微观金相角度综合分析了压水堆核电站Z3CN20-09M不锈钢主管道预制焊缝的性能。对焊缝进行了力学性能试验,并与母材对比;依据金属学理论,讨论了焊缝金属的化学元素、铁素体组织、析出相对力学性能与耐腐蚀性等的影响。结果表明:控制焊缝区N、Ni、Mo、Si等元素含量,可优化焊缝整体质量;焊缝的拉伸强度高于母材,冲击韧性低于母材;焊缝金属析出相为σ和M_(23)C_6,析出相弥散分布于基体上,对材料有强化效果,但同时降低了焊缝的塑韧性及耐腐蚀性。
The performance of prefabricated weld of Z3CN20-09M stainless steel main pipe of PWR nuclear power station is comprehensively analyzed from macroscopic mechanical properties and micro-metallographic view. The mechanical properties of the weld were tested and compared with the base metal. The effects of chemical elements, ferrite microstructure, relative mechanical properties and corrosion resistance of the weld metal were discussed based on the metallographic theory. The results show that controlling the weld joint content of elements such as N, Ni, Mo and Si can optimize the overall quality of the weld. The tensile strength of the weld is higher than that of the base metal and the impact toughness is lower than that of the base metal. And M_ (23) C_6, the precipitated phase dispersed on the matrix, the material has a strengthening effect, but at the same time reduce the weld plasticity and corrosion resistance.