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研究了中国低活化马氏体(CLAM)钢TIG焊缝在550℃静态饱和氧浓度液态铅铋共晶体(LBE)中的腐蚀行为。采用扫描电镜、X射线衍射仪、能谱仪分析了腐蚀后焊缝截面形貌和表面腐蚀产物。结果表明,经过160和350 h腐蚀后,试样均发生氧化腐蚀。所有试样表面均形成了具有保护作用的双层结构的氧化层,外氧化层为疏松多孔的Fe3O4,内氧化层为致密的Fe-Cr尖晶石。试样焊缝中有明显的元素溶解,没有发现Pb、Bi渗透进基体材料。随着腐蚀时间的延长,焊缝氧化腐蚀速度降低;回火处理对CLAM钢TIG焊缝耐氧化腐蚀性能有显著的影响。
The corrosion behavior of TIG weld of low activation martensite (CLAM) steel in liquid state of lead-bismuth eutectic (LBE) at 550 ℃ static saturated oxygen concentration was studied. Scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy were used to analyze the cross-sectional morphology and surface corrosion of the weld after corrosion. The results show that after 160 and 350 h of corrosion, the samples are oxidized and corroded. All samples have a protective oxide layer with a protective double-layer structure, the outer oxide layer is loose porous Fe3O4, and the inner oxide layer is dense Fe-Cr spinel. There was obvious element dissolution in the sample weld, and Pb and Bi were not found penetrated into the matrix material. With the extension of the corrosion time, the oxidation corrosion rate of the weld decreases. The tempering treatment has a significant effect on the oxidation resistance of TIG weld of CLAM steel.