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ASME Press Select Proceedings
International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments
Editor
B. P. Somerday
B. P. Somerday
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P. Sofronis
P. Sofronis
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ISBN:
9780791861387
No. of Pages:
800
Publisher:
ASME Press
Publication date:
2017

Hydrogen-enhanced decohesion (HEDE) along an iron GB was calculated from first-principles, together with embrittling solute segregation (Sb, Sn, or P). Using the HEDE calculated under two conditions of constant composition and constant chemical potential for H, the experimentally estimated fracture energy (wf) of H-induced microcracking along a GB of 3.5Ni-1.7Cr steel was analyzed as a function of GB cohesive energy (2γint). This was compared to an analytical result of temper embrittlement caused by solute segregation. The relationship between temper and H-induced intergranular embrittlement was discussed.

Introduction
Calculations
Analytical Results and Discussion
Conclusions
Acknowledgements
References
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