Abstract
Marage-350 steel containing 12 and 24 vol% of retained austenite was subjected to gas nitriding at 450°C for 8 h in ≈35% dissociated NH 3 gas atmosphere. The depth of the nitride layer decreased from 55 to 35 μm as the retained austenite content is doubled. The layer was predominantly composed of Fe 4N phase. The surface hardness of the material containing 12 and 24 vol% of austenite after nitriding was improved from 536 to 753 Hv and 470 to 705 Hv, respectively. Fatigue tests were performed on smooth specimens at a stress ratio (R)=0.1. It was shown that nitriding played the principal role in the improvement of fatigue strength and sub-surface crack nucleation.
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.
