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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Meso-microstructural computational simulation of the hydrogen permeation test to calculate intergranular, grain boundary and effective diffusivities
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Meso-microstructural computational simulation of the hydrogen permeation test to calculate intergranular, grain boundary and effective diffusivities

机译：氢渗透测试的细观结构模拟，以计算晶界，晶界和有效扩散率

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Hydrogen induced intergranular embrittlement has been identified as a cause of failure of aerospace components such as combustion chambers made from electrodeposited polycrystalline nickel. Accurate computational analysis of this process requires knowledge of the differential in hydrogen transport in the intergranular and intragranular regions. The effective diffusion coefficient of hydrogen may be measured experimentally, though experimental measurement of the intergranular grain boundary diffusion coefficient of hydrogen requires significant effort. Therefore an approach to calculate the intergranular GB hydrogen diffusivity using finite element analysis was developed. The effective diffusivity of hydrogen in polycrystalline nickel was measured using electrochemical permeation tests. Data from electron backscatter diffraction measurements were used to construct microstructural representative volume elements including details of grain size and shape and volume fraction of grains and grain boundaries. A Python optimization code has been developed for the ABAQUS environment to calculate the unknown grain boundary diffusivity. (C) 2015 Elsevier B.V. All rights reserved.
机译：氢致晶间脆化已被确定为航空航天部件（例如由电沉积多晶镍制成的燃烧室）失效的原因。要对此过程进行精确的计算分析，就需要了解颗粒间和颗粒内区域氢输运的差异。氢的有效扩散系数可以通过实验来测量，尽管需要对氢的晶间晶界扩散系数进行实验测量。因此，开发了一种利用有限元分析计算晶间GB氢扩散率的方法。使用电化学渗透测试测量了氢在多晶镍中的有效扩散率。来自电子反向散射衍射测量的数据被用于构建具有代表性的微观结构体元素，包括晶粒尺寸和形状以及晶粒和晶界的体积分数的细节。已经针对ABAQUS环境开发了Python优化代码，以计算未知的晶界扩散率。 （C）2015 Elsevier B.V.保留所有权利。

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