Skip to Main Content
Skip Nav Destination
ASME Press Select Proceedings
International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions
Editor
B. P. Somerday
B. P. Somerday
Search for other works by this author on:
P. Sofronis
P. Sofronis
Search for other works by this author on:
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 ultrafine-grained structures through recrystallization is related to the hydrogen-decreased inverse α´-γ transformation during the heating of the deformed steel.

Introduction
Materials and Experimental Methods
Results and Discussion
Conclusions
Acknowledgements
References
This content is only available via PDF.
You do not currently have access to this chapter.
Close Modal

or Create an Account

Close Modal
Close Modal