16MND5/309L/308L/Z2CND18-12N異種金屬焊接件的組織和性能

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

對國內按照法國核電技術制造的16MND5/309L/308L/Z2CND18-12N異種金屬焊接件的化學成分、顯微組織及力學性能進行了測試分析。結果表明: 焊接件各部分的化學成分均符合相關標準技術要求, 16MND5/309L界面附近的化學成分存在顯著變化; 母材16MND5低合金鋼和Z2CND18-12N不銹鋼的顯微組織分別為上貝氏體和等軸奧氏體, 309L和308L不銹鋼焊縫的顯微組織主要為枝晶狀奧氏體, 其上分布著少量δ-鐵素體, 16MND5/309L界面區域形成了馬氏體薄層; 焊接件的硬度存在不均勻性, 16MND5/309L界面區域的硬度最高。最后分析討論了異種金屬焊接件界面區的碳遷移和其他性能。
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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