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核岛主设备接管安全端部位长期承受高温、高压的交变复杂应力作用。虽然690镍基合金焊缝金属具有优异的耐腐蚀和力学性能,但接管安全端异种金属成分的不均匀性与突变是影响焊接接头力学性能的重要因素,尤其是焊缝与母材过渡区存在显著的成分梯度,成为焊接接头的薄弱地带。采用扫描电子显微镜结合透射电子显微镜,系统研究了焊接接头熔合线界面附近的组织结构及相组成,并通过能谱分析研究了异种金属焊接接头的主要合金元素过渡特征。
Nuclear island host equipment to take over the safety of long-term end to withstand high temperature and high pressure alternating complex stress. Although the weld metal of 690 Ni-based alloy has excellent corrosion resistance and mechanical properties, the heterogeneity and abrupt change of the dissimilar metal components at the take-over safety end are important factors affecting the mechanical properties of the welded joints, especially the transition zone between the weld and the base metal The significant compositional gradient becomes the weakest zone of the welded joints. The microstructure and phase composition of the weld line near the weld line interface were systematically studied by scanning electron microscopy and transmission electron microscopy. The main alloying element transition characteristics of dissimilar metal weld joint were studied by energy spectrum analysis.