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Microstructural based hydrogen diffusion and trapping models applied to Fe–C-X alloys
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jallcom.2020.154057
Andreas Drexler , Tom Depover , Silvia Leitner , Kim Verbeken , Werner Ecker

Abstract Hydrogen embrittlement of modern high strength steels consists of different interacting time-dependent mechanisms. One of these mechanisms is hydrogen diffusion and trapping to accumulate hydrogen in critical areas with high mechanical loads. Therefore, understanding hydrogen diffusion and trapping behavior of carbides containing high strength steels is an essential part to effectively increase the hydrogen resistance. For that purpose, a microstructural based model was developed and parametrized to Fe–C–V and Fe–C–Ti alloys. Generalized analytical equations were derived to describe the evolution of different kinds of trap densities with the measured carbide mean radius, annealing temperature or dislocation density. Finally, the models support the idea of hydrogen trapping at carbon vacancies and coherent interface positions. In future, these models are well suited for finite element process simulations of industrial components to predict the local solubility and chemical diffusion as demonstrated in the last section of this work.

中文翻译:

基于微观结构的氢扩散和捕获模型应用于 Fe-CX 合金

摘要 现代高强度钢的氢脆由不同的相互作用的时间相关机制组成。这些机制之一是氢扩散和捕获,以在具有高机械负载的关键区域积累氢。因此,了解含高强钢碳化物的氢扩散和捕集行为是有效提高抗氢性能的重要组成部分。为此,开发了一种基于微观结构的模型,并将其参数化为 Fe-C-V 和 Fe-C-Ti 合金。推导出了广义的解析方程来描述不同种类的陷阱密度随测量的碳化物平均半径、退火温度或位错密度的演变。最后,这些模型支持在碳空位和相干界面位置捕获氢的想法。在未来,
更新日期:2020-06-01
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