A Rietveld-Type Analysis Code for Pulsed Neutron Bragg-Edge Transmission Imaging and Quantitative Evaluation of Texture and Microstructure of a Welded α-Iron Plate
A Rietveld-Type Analysis Code for Pulsed Neutron Bragg-Edge Transmission Imaging and Quantitative Evaluation of Texture and Microstructure of a Welded α-Iron Plate
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DOI：
10.2320/matertrans.m2010328
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发表时间：
2011-06-01
影响因子：
1.2
通讯作者：
Kiyanagi, Yoshiaki
中科院分区：
文献类型：
--
作者：
Sato, Hirotaka;Kamiyama, Takashi;Kiyanagi, Yoshiaki
利用脉冲中子源进行布拉格边透射成像有望成为研究材料晶体学和金相结构的新方法。该方法在材料开发和工业应用的材料表征研究领域引起了人们的关注，因为它非破坏性地提供了材料（例如厚钢块体）内材料的大面积上的纹理和微观结构的图像。为了从布拉格边缘透射光谱推导出这样的信息，数据分析代码如粉末衍射的Rietveld分析代码是必不可少的。到目前为止，只有关于晶体学各向异性的信息被推导出来。然而，这一信息是不完整的，因为择优取向和微晶尺寸都会影响布拉格边透射光谱。因此，我们开发了一个Rietveld型分析程序，RITS，使我们能够同时获得有关择优取向和晶粒尺寸的信息。为了检验RITS程序的可行性和实用性，我们分析了轧制和焊接α-铁板的布拉格边缘透射光谱，并且我们成功地获得了大块试样大面积上的择优取向数据和晶粒尺寸数据。[doi：10.2320/matertrans.M2010328]
Bragg-edge transmission imaging using a pulsed neutron source is expected to be a new method to investigate the crystallographic and metallographic structure of a material. This method has attracted the attention in the research field of material characterization for materials development and industrial applications because it non-destructively provides the images on the texture and the microstructure inside a material such as a thick steel bulk over the wide area of the material. For deducing such information from the Bragg-edge transmission spectrum, a data analysis code like a Rietveld analysis code for powder diffractometry is indispensable. So far, only the information on the crystallographic anisotropy has been deduced. However, this information is incomplete since both the preferred orientation and the crystallite size affect the Bragg-edge transmission spectrum. Therefore, we have developed a Rietveld-type analysis code, RITS, that allows us to obtain the information on preferred orientation and crystallite size at the same time. To examine the feasibility and the usefulness of the RITS code, we have analyzed the Bragg-edge transmission spectra of rolled and welded alpha-iron plates, and we have successfully obtained the preferred orientation data and the crystallite size data over the wide area of the bulk specimens. [doi:10.2320/matertrans.M2010328]