Hydrogen uptake and diffusion – implications for evaluating resistance to hydrogen embrittlement

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• Dr Alan Turnbull, National Physical Laboratory
• Friday 14 November 2014, 14:00-15:00
• Oatley Seminar Room, Department of Engineering.

If you have a question about this talk, please contact Ms Helen Gardner.

The methodologies for measuring and modelling hydrogen uptake and diffusion in metals are now quite advanced with atomistic modelling increasingly adding to our physical insight and underpinning the more commonly applied continuum models. Despite such progress, best practice and rigour are not always adhered to in too many applications and this impacts on the reliability of test data. Furthermore, data from diffusivity measurements are often employed in engineering applications or in predictive models of cracking in an inappropriate way. An overview will be presented of the varied factors affecting hydrogen uptake and diffusion, perceptions on hydrogen recombination poisons, the concept of reversible and irreversible microstructural traps, and the challenges in integrating the kinetics of hydrogen entry, transport and the micromechanisms of cracking to predict threshold and crack growth kinetics.

This talk is part of the Engineering - Mechanics and Materials Seminar Series series.

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