Al-Falahat Ala'a M, Kardjilov Nikolay, Woracek Robin, Boin Mirko, Markötter Henning, Kuhn Luise Theil, Makowska Malgorzata, Strobl Markus, Pfretzschner Beate, Banhart John, Manke Ingo
Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, Berlin 14109, Germany.
Mechanical Engineering Department, Faculty of Engineering, Mutah University, PO Box 7, Al-Karak 61710, Jordan.
J Appl Crystallogr. 2022 Jul 30;55(Pt 4):919-928. doi: 10.1107/S1600576722006549. eCollection 2022 Aug 1.
A systematic study has been carried out to investigate the neutron transmission signal as a function of sample tem-per-ature. In particular, the experimentally de-ter-mined wavelength-dependent neutron attenuation spectra for a martensitic steel at tem-per-atures ranging from 21 to 700°C are com-pared with simulated data. A theoretical description that includes the Debye-Waller factor in order to describe the tem-per-ature influence on the neutron cross sections was im-plemented in the software and used for the simulations. The analysis of the attenuation coefficients at varying tem-per-atures shows that the missing contributions due to elastic and inelastic scattering can be clearly distinguished: while the elastically scattered intensities decrease with higher tem-per-atures, the inelastically scattered intensities increase, and the two can be separated from each other by analysing unique sharp features in the form of Bragg edges. This study presents the first systematic approach to qu-antify this effect and can serve as a basis , for example, to correct measurements taken during heat treatments, in many cases being a prerequisite for obtaining qu-anti-fiable results.
已开展一项系统研究，以探究中子传输信号随样品温度的变化情况。具体而言，将马氏体钢在21至700°C温度范围内实验测定的波长相关中子衰减谱与模拟数据进行了比较。在软件中实施了一种理论描述，该描述包含德拜-瓦勒因子，以描述温度对中子截面的影响，并用于模拟。对不同温度下衰减系数的分析表明，由于弹性和非弹性散射导致的缺失贡献可以清晰区分：随着温度升高，弹性散射强度降低，而非弹性散射强度增加，并且通过分析布拉格边形式的独特尖锐特征可以将两者彼此分离。本研究提出了量化这种效应的首个系统方法，例如可作为校正热处理过程中测量值的基础，在许多情况下，这是获得可量化结果的先决条件。
