Abstract
The evolution of the microstructure during post-discharge nitriding of pure iron at 773°K in a diluted N 2 atmosphere has been studied with an emphasis on the initial stages. Phase formation starts after 30 s with the precipitation of γ′-Fe 4N needle-like nitrides on the surface. Coverage of the surface then quickly proceeds by continuous needle nucleation and needle branching. Simultaneously with surface coverage, nitride wedges grow into the matrix and eventually form a continuous layer mainly by lateral spreading. The longest nitriding time results in the formation of a compact nitride bilayer. Mechanisms for phase nucleation in this process are discussed and compared to those proposed for ion and conventional gas nitriding. In general, kinetics of phase formation are similar to ion plasma nitriding, while the morphology and crystallographic precipitation characteristics tend to follow the trends observed in conventional gaseous nitriding.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
