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首页> 外文期刊>ISIJ international >Improvement of Bragg-edge Neutron Transmission Imaging for Evaluating the Crystalline Phase Volume Fraction in Steel Composed of Ferrite and Austenite
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Improvement of Bragg-edge Neutron Transmission Imaging for Evaluating the Crystalline Phase Volume Fraction in Steel Composed of Ferrite and Austenite

机译：用于评价铁氧体和奥氏体钢中晶体相体积分数的布拉格边中子透射成像的改进

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The Bragg-edge neutron transmission imaging method can quantitatively visualize various types of crystalline microstructural information inside a bulk material over a large visualization field area. In this study, we investigated and improved both the experimental method and the data analysis method for the evaluation of crystalline phase volume fraction in steel composed of ferrite/martensite and austenite. For wavelength-resolved neutron transmission imaging experiments, we confirmed that accurate measurement of neutron transmission intensities was crucial. Therefore, the background neutrons scattered from a sample must be reduced. Simultaneously, we confirmed that a neutron wavelength resolution of approximately 1% was required. For the data analysis of the measured Bragg-edge neutron transmission spectrum, we used double March-Dollase orientation distribution functions for each crystalline phase to achieve effective spectrum correction of the crystallographic texture effect. As a result, this data analysis method allows improved evaluation of the crystalline phase volume fraction, compared with the use of a single March-Dollase function for each phase.
机译：布拉格边中子透射成像方法可以在大型可视化场区域上定量地可视化散装材料内部的各种晶体微结构信息。在这项研究中，我们研究并改善了用于评估由铁氧体/马氏体和奥氏体的钢中晶体相体积分数评价的实验方法和数据分析方法。对于波长分辨中子传输成像实验，我们证实了中子传动强度的准确测量至关重要。因此，必须减少从样品散射的背景中子。同时，我们确认需要约1％的中子波长分辨率。对于测量的布拉格边中中子传输谱的数据分析，我们使用了每个结晶相的双3月 - 挖土方​​向分布函数，以实现晶体纹理效应的有效频谱校正。结果，与每个阶段的单一3月茶度功能的使用相比，该数据分析方法允许改善晶体相体积分数的评估。

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