【摘要】 采用OM,XRD,EPMA,TEM分析了电子束焊接Ti-6Al-4V焊缝区域的精细组织结构特征。结果表明接头区域组织形态由基体等轴晶向焊缝柱状形态演化,焊缝区域呈现单一α′网篮状组织,TEM板束形态呈多向分布,焊缝区域的位错分布密度与基体母材相比呈现出减小的趋势,且熔合线附近存在V,Fe等β稳定元素浓度起伏现象。更多还原

【Abstract】 Microstructure characteristic in fusion zone of electron beam welding of Ti-6Al-4V was studied by means of OM, XRD, EPMA and TEM. The results indicated that crystallizing morphology of fusion zone was evolved into columnar crystals from equiaxed grain in base metal. Only α′phase presenting basket-weave microstructure was produced. Lath of fine microstructure in fusion zone present multi-directional distribution. Some β stabilized element such as Fe, V concerntration distribution fluctuation occurred nearby fusion line. Dislocation density in fusion zone obviously decreased than that of base metal.更多还原