Neutron Bragg-edge mapping of weld seams
Neutron Bragg-edge mapping of weld seams
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DOI：
10.3139/146.110673
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发表时间：
2012-02-01
影响因子：
0.8
通讯作者：
Banhart, John
中科院分区：
文献类型：
--
作者：
Kardjilov, Nikolay;Manke, Ingo;Banhart, John
冷中子具有与大多数多晶金属材料的晶格间距相同的波长。具有不同波长的单色冷中子的此类材料的成像，由于连贯的bragg散射，具有独特的对比度。此外，可以使用相应的波长扫描的传输数据为图像的每个点映射Bragg边缘的光谱位置。我们介绍了对传输光谱中特定的布拉格 - 边缘围绕这种能量选择性中子X线照相的焊接组件的研究。焊缝局部微观结构的特征已被可视化。
Cold neutrons have a wavelength that is in the same range as the lattice spacings of most polycrystalline metallic materials. Imaging of such materials with monochromatic cold neutrons of different wavelengths provides a unique contrast due to coherent Bragg scattering. Additionally, the spectral positions of the Bragg edges can be mapped for each point of an image by using the transmission data of corresponding wavelength scans. We present investigations of welded components with such energy-selective neutron radiography around specific Bragg-edges in the transmission spectrum. Features in the local microstructure of the weld have been visualized.