16MND5/309L/308L/Z2CND18-12N异种金属焊接件的组织和性能

Microstructure and Mechanical Properties of 16MND5/309L/308L/Z2CND18-12N Dissimilar Metal Weld

对国内按照法国核电技术制造的16MND5/309L/308L/Z2CND18-12N异种金属焊接件的化学成分、显微组织及力学性能进行了测试分析。结果表明: 焊接件各部分的化学成分均符合相关标准技术要求, 16MND5/309L界面附近的化学成分存在显著变化; 母材16MND5低合金钢和Z2CND18-12N不锈钢的显微组织分别为上贝氏体和等轴奥氏体, 309L和308L不锈钢焊缝的显微组织主要为枝晶状奥氏体, 其上分布着少量δ-铁素体, 16MND5/309L界面区域形成了马氏体薄层; 焊接件的硬度存在不均匀性, 16MND5/309L界面区域的硬度最高。最后分析讨论了异种金属焊接件界面区的碳迁移和其他性能。
The chemical compositions, microstructure and mechanical properties of 16MND5/309L/308L/Z2CND18-12N dissimilar metal weld(DMW) which was manufactured with French nuclear power technologies were analyzed. The results indicate that the chemical compositions of main parts of the DMW met the requirements of relevant standards and there was a significant change across 16MND5/309L interface. The microstructures of 16MND5 and Z2CND18-12N steel were upper-bainite and equiaxed austenite respectively. The microstructures of 309L and 308L weld were dendritic austenite with a little δ-ferrite. The 16MND5/309L interface had a thin layer of martensite. The hardness distribution across the DMW was not homogenious and the 16MND5/309L interface exhibited the highest hardness. Carbon migration and other properties of the DMW were also discussed.

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