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Hydrogen embrittlement mechanisms of steels have been studied for severaldecades. Understanding hydrogen diffusion behavior in steels is crucial towardsboth developing predictive models for hydrogen embrittlement and identifyingmitigation strategies. However, because hydrogen has a low atomic mass, it isextremely challenging to detect by most analytical methods. In recent years,cryogenic-transfer atom probe tomography (APT) ofelectrochemically-deuterium-charged steels has provided invaluable qualitativeanalysis of nanoscale deuterium traps such as carbides, dislocations, grainboundaries and interfaces between ferrite and cementite. Independently, cyclicvoltammetry (CV) has provided valuable analysis of bulk hydrogen diffusion insteels. In this work, we use a combination of CV and cryogenic-transfer APT forquantitative analysis of deuterium pickup in electrolytically charged pure Fe(ferrite) and a model austenitic Fe18Cr14Ni alloy without any second phase ordefect trap sites. The high solubility and low diffusivity of hydrogen inaustenite versus ferrite are highlighted to result in clear observablesignatures in CV and cryogenic-transfer APT results. The remaining challengesand pathway for enabling quantitative analysis of hydrogen pick up in steels isalso discussed.

Towards Quantitative Analysis of Deuterium Absorption in Ferrite and  Austenite during Electrochemical Charging by Comparing Cyclic Voltammetry and  Cryogenic Transfer Atom Probe Tomography