摘要
Hydrogen embrittlement of steels is directly linked to hydrogen diffusion and trapping in the microstructure,which can hardly be precisely measured by modern experimental techniques.A phase-field model,in which a chemical potential well of hydrogen in the grain boundaries is introduced,is proposed to simulate hydrogen diffusion and trapping in the polycrystalline iron.It was interestingly found that grain boundaries,as connected trap sites,have a complex influence on the effective diffusivity of hydrogen,which are strongly linked to grain boundary diffusivity and binding energy.
基金
the National Key R&D program of China(No.2016YFB0300104)
the financial support by the Beijing Natural Science Foundation(No.2182024)
the National Natural Science Foundation of China(Grant Nos.51501099 and U1764252)
the National Young 1000-Talents Program(No.D1101073)。