TITLE:
Hydrogen Embrittlement of Nitrogenating Layer on Martensitic Alloys
AUTHORS:
Daniel Moreno, Yohanan Nachmana, Shimon Bashan, Barak Weizman, Denis Panchenko, Michael Mansano, Elinor Itzhak, Moshe Shapira
KEYWORDS:
Hydrogen Embrittlement, Nitriding Coat, Cracks, Martensite Steel, Surface Hardness
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.11 No.5,
September
8,
2023
ABSTRACT: Nitriding of the surface in martensitic stainless steels is commonly carried out to improve their wear resistance. The process of plasma nitriding in stainless steel is influenced by two mechanisms: physical diffusion through the surface and chemical gas-metal reaction. The inner nitriding interaction involves the simultaneous penetration and formation of a solid solution, as well as the interaction of nitrogen with specific alloying elements, resulting in the development of homogeneous and heterogeneous structures. Our study concludes that the observed intergranular hydrogen embrittlement and crack formation during the surface nitridation process of AMS 5719 martensite alloy steel can be attributed to the ammonium concentration of approximately 50% at a temperature of 530˚C.