Multiscale 3D characterization of discontinuities in underwater wet welds
Multiscale 3D characterization of discontinuities in underwater wet welds
复制标题
DOI：
10.1016/j.matchar.2015.07.030
复制
发表时间：
2015-09
影响因子：
4.7
通讯作者：
L. F. Silva;V. Santos;S. Paciornik;J. Mertens;N. Chawla
中科院分区：
文献类型：
--
作者：
L. F. Silva;V. Santos;S. Paciornik;J. Mertens;N. Chawla
水下湿法焊接是在与其他焊接材料直接接触的情况下进行的，具有高冷却速率和气体金属反应，导致焊缝金属中形成孔隙、裂纹和夹杂物。这些不连续性出现在广泛的尺寸，形状和方向，并需要3D技术进行完整的表征。实验室规模的X射线显微CT用于分析孔隙和裂纹，而同步辐射显微CT和FIB/SEM用于表征夹杂物。开发了特定的图像分析序列来处理不同类型的噪声，分割不连续性，消除虚假特征，并测量3D参数。相关物体以3D形式呈现，确认了预期的大小和方向特征。在可能的情况下，比较了不同尺度和技术的结果。
Underwater wet welding is performed in direct contact with other, with high cooling rates and gas metal reactions that lead to the formation of pores, cracks and inclusions in the weld metal. These discontinuities appear in a wide range of sizes, shapes and orientations, and require 3D techniques for complete characterization. Lab scale X-ray MicroCT was used to analyze pores and cracks, while synchrotron MicroCT and FIB/SEM were used to characterize inclusions. Specific image analysis sequences were developed to deal with different types of noise, segment the discontinuities, eliminate spurious features, and measure 3D parameters. The relevant objects were rendered in 3D, confirming the expected size and orientation characteristics. Whenever possible, results from different scales and techniques were compared.