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International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions

Editor
B. P. Somerday
B. P. Somerday
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P. Sofronis
P. Sofronis
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ISBN:
9780791860298
No. of Pages:
844
Publisher:
ASME Press
Publication date:
2014

The effect of hydrogen on the strain-induced phase transformation from γ-austenite to α´-martensite in type 304 steel was studied using X-ray diffraction. Tensile strain of more than 5% induced the α’-martensite, and the fraction of α´-martensite formed depended on deformation degree. Subsequent hydrogenation at 543 K under hydrogen pressure of 100 MPa during 200 hours reduced the martensite fraction, which was accompanied by grain refinement. Ab initio atomic calculations of free energies for the α- and γ-iron performed in the harmonic approximation demonstrate that hydrogen decreases the temperature of equilibrium for these phases. It is suggested that the formation of...

Introduction
Materials and Experimental Methods
Results and Discussion
Conclusions
Acknowledgements
References
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