摘要
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 China Low Activation Martensitic （CLAM） steel TIG weld bead in static lead bismuth eutectic saturated by oxygen at 550oC was studied. Scanning electron microscopy （SEM）,X-ray diffraction （XRD） and energy dispersive spectroscopy （EDS） were employed to analyze the cross-section morphology and corrosion products of weld bead after corrosion. The results show that all the samples suffer oxidation corrosion after 160h and 350h exposure to lead bismuth eutectic. A protective double layer oxide film which consists of a loose and porous Fe304 outer layer and a dense Fe-Cr spinel inner layer is formed on surface of all the samples. The dissolution of steel components is observed. No penetration of Pb,Bi into the matrix is found. The oxidation corrosion rate decreases with testing time prolonging. The post-weld tempering process has significant effects on the oxidation corrosion performance of TIG weld bead of CLAM steel.
出处
《热加工工艺》
CSCD
北大核心
2015年第23期23-26,共4页
Hot Working Technology
基金
国家自然科学基金项目(51375216)
